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Study on Photoacoustic Phased Array Focusing Technology in Thin Plates
XIAO Yugang, CHENG Hao, GAO Chunming, and ZHANG Ping
The photoacoustic technology has attracted extensive attention because of its high spatial resolution of sound source and easy generation. However, due to the low efficiency of photoacoustic conversion, how to use multi-point photoacoustic to generate acoustic focusing has become an important way to improve the sensitiThe photoacoustic technology has attracted extensive attention because of its high spatial resolution of sound source and easy generation. However, due to the low efficiency of photoacoustic conversion, how to use multi-point photoacoustic to generate acoustic focusing has become an important way to improve the sensitivity of photoacoustic detection. In order to use the multi-point photoacoustic to generate acoustic focusing to improve the sensitivity of photoacoustic detection, the study on photoacoustic focusing based on eight-element array is carried out in this paper. The effects of spatial excitation position, frequency and number of the array elements on the photoacoustic focusing performance are analyzed with the time reversal method based on the simulation and experimental methods. The experimental results show that a focusing effect of great than 10 times has been obtained..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 1 (2022)
Propagation Characteristics of Surface Acoustic Wave Based on ScAlN/6H-SiC Structure
NAI Riga, MA Jun, WANG Yuanyuan, DOU Yawen, LYU Haitao, QIAN Lirong, and LI Cuiping
In this paper, the propagation characteristics of the surface acoustic waves based on ScAlN/6H-SiC structure is studied by using the finite element method. The influences of the piezoelectric materials thickness change on the phase velocity and electromechanical coupling coefficient of SAW in ScAlN/6H-SiC structure undIn this paper, the propagation characteristics of the surface acoustic waves based on ScAlN/6H-SiC structure is studied by using the finite element method. The influences of the piezoelectric materials thickness change on the phase velocity and electromechanical coupling coefficient of SAW in ScAlN/6H-SiC structure under four kinds of exciting conditions is analyzed. The electromechanical coupling coefficient is optimized again by changing the electrode thickness and metallization ratio. The results show that the electromechanical coupling coefficient of IDT/ScAlN/6H-SiC structure can reach 5.4%, and the corresponding phase velocity is 6.36 km/s. After adding short-circuit metal, the electromechanical coupling coefficient and phase velocity have been improved. The optimized electromechanical coupling coefficient and phase velocity of SAW in metal/ScAlN/6H-SiC structure are 15.78% and 7.33 km/s, respectively..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 6 (2022)
Research on a Disc Piezoelectric Filter
RONG Tian, WANG Hongwei, and YU Zhaoxian
A disc-shaped piezoelectric filter is developed in this work. The physical model of the filter is analyzed theoretically and the ANSYS finite element simulation is carried out. The relationship between the input and output frequency is determined through experiment. The disc-shaped piezoelectric filter is tested on a sA disc-shaped piezoelectric filter is developed in this work. The physical model of the filter is analyzed theoretically and the ANSYS finite element simulation is carried out. The relationship between the input and output frequency is determined through experiment. The disc-shaped piezoelectric filter is tested on a self-designed experimental platform. The results show that the disc-piezoelectric filter can filter out signals with different frequencies according to different frequency requirements, and do not generate other harmonics. It shows that the fabricated disc-piezoelectric filter has good filtering characteristics..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 10 (2022)
Defect Detection of Unequal Thickness Butt Weld Based on Zero-Group-Velocity Lamb Wave
GAO Yunpeng, FAN Pingcheng, LIAO Lin, and YUAN Maodan
Due to the differences in materials, processes and environment, the welded structures are prone to various types of defects, which will seriously affect the overall safety performance of the structure. The ultrasonic method is an effective non-destructive measurement method for defect, but the conventional ultrasonic dDue to the differences in materials, processes and environment, the welded structures are prone to various types of defects, which will seriously affect the overall safety performance of the structure. The ultrasonic method is an effective non-destructive measurement method for defect, but the conventional ultrasonic defect measurement technology has the problem of mode conversion when dealing with the complex curved surfaces, which affects the accuracy of defect detection. Therefore, a simulation study on the unequal thickness butt weld defect detection based on zero-group-velocity Lamb wave mode is carried out in this work. First, based on the finite element characteristic frequency method with Bloch-Floquet boundary and domain constraints, the frequency deviation of the zero-group-velocity mode in a thin plate with variable thickness is studied, and the zero-group-velocity mode sensitive to thickness changes is selected and the parameters of excitation signal are optimized. Then, a welding simulation model is established to verify the frequency deviation law of the zero-group-velocity mode in the thin plate with variable thickness, and the curve thickness of the weld thin plate iss successfully reconstructed with an error of ±0.05 mm. Finally, a welding model of the unequal thickness plate is established for defect detection, and the position information (>0.5 mm) of the small defects inside the weld is successfully reconstructed, and the errors of the thickness direction and the horizontal direction are ±0.05 mm and ±0.02 mm respectively..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 15 (2022)
Relaxation Ferroelectric Single Crystal Three-Axis Acceleration Sensor
JI Jinhao, TU Xinyu, and LI Junbao
In this paper, a structure of relaxation ferroelectric single crystal three-axis acceleration sensor suitable for low frequency measurement is proposed. Each coordinate axis of the acceleration sensor is composed of a single crystal bending beam sensitive element. Through the finite element simulation, the influences oIn this paper, a structure of relaxation ferroelectric single crystal three-axis acceleration sensor suitable for low frequency measurement is proposed. Each coordinate axis of the acceleration sensor is composed of a single crystal bending beam sensitive element. Through the finite element simulation, the influences of the structure dimension parameters of the thickness of the single crystal layer, the thickness of the metal layer of the base beam, the material of the base beam etc. in the bending beam structure on the resonance frequency and acceleration sensitivity are analyzed, and the optimal structure size is obtained, and a relaxation ferroelectric single crystal three-axis acceleration sensor prototype is developed and tested. The test results show that the single crystal three-axis acceleration sensor has good consistency in all directions, and the sensitivity of the acceleration sensor is up to 86.1 mV/(m·s-2),and can work in the low frequency band of 10~400 Hz..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 21 (2022)
FEM Simulation Study on Single Crystalline LN BAW Resonator
ZHANG Yi, and SUN Yanlong
The single crystalline lithium niobite(LN) piezoelectric thin film fabricated by crystal-ion-slicing(CIS) technique can be used as the piezoelectric layer in bulk acoustic wave (BAW) devices, which has attracted increasing attention in recent years. The performance of BAW filter is closely related to that of BAW resonaThe single crystalline lithium niobite(LN) piezoelectric thin film fabricated by crystal-ion-slicing(CIS) technique can be used as the piezoelectric layer in bulk acoustic wave (BAW) devices, which has attracted increasing attention in recent years. The performance of BAW filter is closely related to that of BAW resonator, but the simulation and optimization of the BAW resonator based on LN single crystalline film has not been reported in depth. In the present work, the FEM simulation model of the solid-mounted resonator (SMR) is established by using the single crystalline LN thin film as the core piezoelectric layer material, the thickness of the piezoelectric layer and the Bragg reflector layer are designed, with an emphasis on the two-dimensional model simulation of the step structure of the top electrode of the resonator, which provides a theoretical basis for the preparation of high frequency LN BAW filter..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 26 (2022)
Design and Application of Novel L-Type Bidirectional Intelligent Scraper
GUO Yunmeng, QIN Zhengwang, GAO Chunming, and ZHANG Ping
In the practical application of laser selective melting technology, there will be some problems, such as prominent melting point and workpiece warpage, which will affect the quality of powder spreading and final formed workpiece. In order to improve the powder laying quality of laser selective melting, an L-type bidireIn the practical application of laser selective melting technology, there will be some problems, such as prominent melting point and workpiece warpage, which will affect the quality of powder spreading and final formed workpiece. In order to improve the powder laying quality of laser selective melting, an L-type bidirectional intelligent scraper based on PZT-5H array is designed, and its sensor performance, single channel signal sensitivity and powder laying simulation are tested. The overall sensitivity of the scraper is 100 μm, which effectively improves the powder spreading quality of the intelligent scraper in laser selective melting, and lays a foundation for the intellectualization of subsequent additive manufacturing..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 30 (2022)
Research on Feedforward Compensation of Piezoelectric Ceramics Based on Deep Neural Network(DNN)
XIONG Yongcheng, JIA Wenhong, ZHANG Limin, and ZHENG Lifang
Aiming at the inherent hysteresis nonlinearity of piezoelectric ceramics, a feedforward compensation control system based on the deep neural network (DNN) is designed in this paper. The system consists of one input layer, seven hidden layers and one output layer. The experimental results show that the displacement lineAiming at the inherent hysteresis nonlinearity of piezoelectric ceramics, a feedforward compensation control system based on the deep neural network (DNN) is designed in this paper. The system consists of one input layer, seven hidden layers and one output layer. The experimental results show that the displacement linearity error of piezoelectric ceramics reaches 8.91 μm in the open loop condition. After applying neural network feedforward compensation, the maximum displacement error of piezoelectric ceramics is reduced to 80 nm, and the steady-state error is ±20 nm. Further tests show that the maximum error of the system is less than 100 nm at the input frequency of 10~100 Hz, and the root mean square error is 0.01 μm, which verifies that the deep neural network can accurately compensate the dynamic hysteresis and nonlinearity of piezoelectric ceramics and has good frequency generalization ability..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 35 (2022)
Analysis of Deflection Angle of Piezoelectric Micromirror Plate with Large Deflection
DU Yongfei, MENG Jiang, FAN Wei, LIU Kai, JIANG Tong, and AN Kun
The rectangular plate structure under free boundary conditions is theoretically analyzed by elastic force in this paper. The geometry, physics and balance equations of the plate structure are established. By analyzing the pure bending case of the thin plate, the function expression of its deflection curve is obtained. The rectangular plate structure under free boundary conditions is theoretically analyzed by elastic force in this paper. The geometry, physics and balance equations of the plate structure are established. By analyzing the pure bending case of the thin plate, the function expression of its deflection curve is obtained. The COMSOL software is used to simulate and analyze the PZT-based square plate under those conditions, and through parameter identification, the curve fitting of simulation curve and theory is carried out to verify the consistency of theory and simulation. The authenticity of the simulation data is verified by experimental test. On this basis, the deflection angle of the square thin plate can be solved, which can further realize the deflection of the beam by the thin plate in the field of laser communication, and achieve the function of accurately controlling the deflection angle of the beam..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 42 (2022)
Monitoring Force State of Pin Shaft Connection Based on Piezoelectric Ceramics
HUO Linsheng, ZHANG Chenchen, and ZHAO Nan
The pin shaft connection is a commonly used connection component in engineering, the real-time monitoring of its health state under load is vital to the overall stability of the structure. In this paper, a real-time monitoring method for the force state of the pin-shaft connection based on piezoelectric theory is studiThe pin shaft connection is a commonly used connection component in engineering, the real-time monitoring of its health state under load is vital to the overall stability of the structure. In this paper, a real-time monitoring method for the force state of the pin-shaft connection based on piezoelectric theory is studied by theory and experiment. To identify the force state of pin-shaft connection, the energy of received signal is analyzed based on the wavelet packet theory. The results show that the energy of the received signal is related to the force state of the pin-shaft connection. With the increase of the normal pressure on the contact surface, the energy of the received signal increases, but when the normal pressure increases to a certain value, the energy of the received signal reaches saturation. Therefore, the monitoring method for pin-shaft connection based on piezoelectric theory proposed in this paper has good feasibility and application significance in a certain load range..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 48 (2022)
Influence of Elastic Magnifier on Characteristics of Piezoelectric Energy Harvester Under Parametric Excitation
QIN Chengwu, LIU Jingyang, SUN Dehua, YANG Lei, and XIE Jin
A scheme to mount an elastic magnifier to piezoelectric energy harvester under parametric excitation is proposed in this paper. Using the extended Hamiltonian principle, the dynamics equation of the system is established, and simulations are carried out to investigate the influence of the elastic magnifier and stiffnesA scheme to mount an elastic magnifier to piezoelectric energy harvester under parametric excitation is proposed in this paper. Using the extended Hamiltonian principle, the dynamics equation of the system is established, and simulations are carried out to investigate the influence of the elastic magnifier and stiffness parameters on the characteristics of energy harvester. The results show that when the piezoelectric beam does not buckle and the natural frequency ratio of the piezoelectric beam to the elastic amplifier meets the resonance condition of 1∶2, the excitation threshold of the parametric excitation energy harvester can be reduced and the frequency bandwidth of the energy harvester can be widened. The stiffness coefficient is named as resonance stiffness coeffieient, ksr. It is indicated that when the stiffness coefficient of the elastic magnifier is less than ksr, the mean power output, the peak of root-mean-square voltage and the frequency bandwidth increase with the increasing of the stiffness parameter. When the stiffness coefficient of the elastic amplitude amplifier is greater than the resonance stiffness coefficient, with the increase of the stiffness coefficient, the frequency bandwidth of the energy harvester increases, the peak value of root mean square voltage decreases slightly, and the average output power tends to be the same when the excitation amplitude is large..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 53 (2022)
Modeling and Response Analysis of Piezoelectric Vibration Energy Harvester
FENG Yiting, LIU Wenguang, FANG Mengxiang, WU Xingyi, GAO Mingyang, and CHEN Hongxia
Taking the multi-directional piezoelectric vibration energy harvester as the object, a simplified electromechanical coupling dynamic model of the system is established, and the finite element model of the energy harvesting device is constructed by COMSOL software. The vibration modes of the system are analyzed, and theTaking the multi-directional piezoelectric vibration energy harvester as the object, a simplified electromechanical coupling dynamic model of the system is established, and the finite element model of the energy harvesting device is constructed by COMSOL software. The vibration modes of the system are analyzed, and the effects of different structural parameters of the system on its voltage frequency domain response and load power impedance matching are discussed. The effects of different magnetic spacing on the electrical response are investigated by introducing nonlinear magnetic force. The results show that the peak values of load voltage and load power of the energy harvester can reach 37 V and 6.9 mW respectively under the acceleration load of 1g(g=9.8 m/s2) in y direction. Reducing the thickness of piezoelectric ceramics, spring substrate and increasing the weight of additional mass block is more advantageous for energy harvesting, and the energy harvester has an autonomous tuning function under the action of magnetic force, which enhances the environmental adaptability..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 62 (2022)
Design of Piezoelectric Stack Driving Power Supply Based on PA41
SUN Han, SHI Yunlai, SUN Haichao, and LIN Yuyang
Based on analyzing the working characteristics of piezoelectric stack, a voltage-controlled piezoelectric stack driving power supply with high voltage operational amplifier PA41 as the core device is designed. Two kinds of driving circuit methods are described and an appropriate scheme is selected. The principle of theBased on analyzing the working characteristics of piezoelectric stack, a voltage-controlled piezoelectric stack driving power supply with high voltage operational amplifier PA41 as the core device is designed. Two kinds of driving circuit methods are described and an appropriate scheme is selected. The principle of the driving circuit is analyzed and the selection of circuit components is completed. Finally, an experimental platform is built to test the driving power supply and its output characteristic curve and the cause of output error are analyzed. The experimental results show that the power supply is easy to adjust, quick to respond, and can be effectively applied to the drive control of piezoelectric stack..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 68 (2022)
Design of Piezoelectric Energy Harvesting System Based on Vortex Induced Vibration and Flutter
ZHANG Dan, ZHENG Shu, DOU Yaping, SUI Wentao, and SONG Rujun
In order to solve the problem of single wind direction acquisition of wind-induced vibration energy harvester, an airfoil baffle is added at the other end of the cantilever beam based on the vortex induced vibration of the cylinder. The sensing direction of the airfoil baffle drives the cylinder to rotate to change witIn order to solve the problem of single wind direction acquisition of wind-induced vibration energy harvester, an airfoil baffle is added at the other end of the cantilever beam based on the vortex induced vibration of the cylinder. The sensing direction of the airfoil baffle drives the cylinder to rotate to change with the change of wind direction. The airfoil plate can also flutter under the excitation of wind energy to improve the vibration efficiency of cantilever beam. The rotating part of the wind energy harvesting device is simulated by using the Solidworks, and by changing the wind speed, the pressure and the intensity of pressure on different positions of rotating parts in the fluid are analyzed to ensure that the device can work normally in the natural environment..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 73 (2022)
Simulation and Experiment on Piezoelectric Energy Harvester Array Based on Vortex-Induced Vibration
YU Huihui, LI Li, WANG Yongyao, MA Xiongfei, and CHEN Peng
In order to solve the problem that the single piezoelectric energy harvester cannot meet the large power supply demand of some microelectronic devices, the fluid-solid-electrical coupling simulation of piezoelectric energy harvester array based on vortex-induced vibration was carried out in this paper, and the simulatiIn order to solve the problem that the single piezoelectric energy harvester cannot meet the large power supply demand of some microelectronic devices, the fluid-solid-electrical coupling simulation of piezoelectric energy harvester array based on vortex-induced vibration was carried out in this paper, and the simulation results were compared with the wind tunnel experimental data. Firstly, the energy harvester structure of the front choke was tested to verify its feasibility, and then the piezoelectric energy harvester structure in series, parallel, staggered and rectangular arrays were studied. The simulation and experimental results showed that the piezoelectric energy harvester array increased as a whole with the increase of wind speed, and increased at first and then decreased with the increase of spacing. The diameter D of the energy harvester of the front choke was 0.02 m, and the peak output voltage was 4.35 V when the wind speed was 6 m/s and the center distance was L=5D, the rectangular array had the best power generation performance, and the peak output voltage was 9.98 V when the wind speed was 6.5 m/s and the center distance is L=1.5D. The results indicated that the piezoelectric energy harvester array had certain advantages over the single piezoelectric energy harvester, which provided a reference for the research of piezoelectric energy harvesting based on vortex-induced vibration..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 77 (2022)
Study on Temperature Compensation of Optical Fiber Displacement Sensor Based on Optimized RBF Neural Network
SUN Chao, GUO Naiyu, YE Li, MIAO Longxin, CAO Mian, DING Jianjun, and YAN Mingdie
In the process of temperature calibration of optical fiber displacement sensor, it is found that with the change of working environment, the measured value of the displacement sensor will deviate, which will reduce the accuracy of the displacement sensor with the change of ambient temperature. In this paper, the radialIn the process of temperature calibration of optical fiber displacement sensor, it is found that with the change of working environment, the measured value of the displacement sensor will deviate, which will reduce the accuracy of the displacement sensor with the change of ambient temperature. In this paper, the radial basis function (RBF) neural network is used to compensate the temperature of displacement sensor, and a self-adaptive design idea is used to find the center of radial basis function in order to reduce the drift deviation. By taking the displacement and ambient temperature as the input and the sensor output voltage as the output, the adaptive design idea is used to determine the center of the basis function, and a model based on RBF neural network is established. The results show that the training results of the model can reduce the relative error of the optical fiber displacement sensor by 9.23%, and the measurement accuracy is improved greatly, which verifies the feasibility of this method..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 85 (2022)
Research on Optimization of Centrifugal Distance of Piezoelectric Cantilever Beam in Rotating Tire
ZHANG Yunshun, ZHAO Xiangshuai, and WANG Wanshu
Aiming at the problem of poor response of piezoelectric cantilever in low frequency region, a method to optimize the centrifugal distance of the magnet at the end of the cantilever is proposed based on self-tuning stochastic resonance. Firstly, the dynamic equation of end magnet is analyzed and deduced. Then the optimiAiming at the problem of poor response of piezoelectric cantilever in low frequency region, a method to optimize the centrifugal distance of the magnet at the end of the cantilever is proposed based on self-tuning stochastic resonance. Firstly, the dynamic equation of end magnet is analyzed and deduced. Then the optimization function of self-tuning stochastic resonance frequency and rotation frequency is established based on the Kramers escape rate, and the optimal centrifugal distance matching mechanism is obtained. Finally, the optimal centrifugal distance is obtained by using the optimal centrifugal distance matching mechanism, and the displacement, velocity and voltage responses of the piezoelectric cantilever under different centrifugal distances are compared. The results show that when the centrifugal distance reaches the optimal value, in a certain frequency range, the stochastic resonance frequency follows the rotation frequency, the stochastic resonance phenomenon can occur continuously, and its effective response frequency band is extended to 30~50 rad/s, and the ratio of broadening the frequency band is about 40%, and the energy harvesting performance is effectively improved..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 89 (2022)
Design and Simulation of Piezoelectric Energy Harvesting Interface Circuit
WANG Yongyao, LI Li, AN Ranran, YU Huihui, MA Xiongfei, and CHEN Peng
In order to provide a stable, efficient and long-term energy supply method for wireless sensor network nodes, a piezoelectric energy harvesting interface circuit based on an enhanced synchronous charge extraction circuit(ESECE) is proposed. The enhanced synchronous charge extraction circuit is simulated by using the MuIn order to provide a stable, efficient and long-term energy supply method for wireless sensor network nodes, a piezoelectric energy harvesting interface circuit based on an enhanced synchronous charge extraction circuit(ESECE) is proposed. The enhanced synchronous charge extraction circuit is simulated by using the Multisim circuit simulation software, and compared with the standard piezoelectric energy harvesting interface circuit(SEH) and the synchronous charge extraction circuit(SECE).The experimental results show that under the same excitation conditions, the output power of the ESECE is nearly 30% higher than that of the SECE,the maximum output power of the ESECE is up to 190 μW.At the same time, it guarantees the independence of the output power and the load resistance..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 95 (2022)
Design of a New Type of Flexible Clamping High Frequency Ultrasonic Transducer
GAO Rongxin, ZHANG Hongjie, and ZHANG Hongjian
To enhance the vibration amplitude output and the ultrasonic energy delivery efficiency of the high-frequency ultrasonic transducer, a new type of flexible clamping high frequency ultrasonic transducer was proposed. Based on the modular design method, a systematic design method for this type of ultrasonic transducer waTo enhance the vibration amplitude output and the ultrasonic energy delivery efficiency of the high-frequency ultrasonic transducer, a new type of flexible clamping high frequency ultrasonic transducer was proposed. Based on the modular design method, a systematic design method for this type of ultrasonic transducer was developed by combining the electromechanical equivalent method, four-terminal network, finite element analysis, and flexibility analysis. Then, a prototype was fabricated and an experimental platform was set up to test its electrical and dynamic properties. The excitation trial shows that the steady-state amplitude at the output end of the flexible clamping transducer is 38.55% higher than that of the traditional clamping transducer. The dynamic amplitude signal analyses in the time-and frequency-domain were carried out and the results show that by combining the flexible hinge-based mechanism with the traditional flange clamping structure and introducing a flexible rotating pair, the ultrasonic energy transfer efficiency of the flexible clamping transducer is improved by 5.16%, indicating that the flexible clamping flange can improve the motion decoupling ability of the clamping structure, presenting a good application prospect..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 101 (2022)
Optimal Design and Experimental of Ultrasonic Antifriction Vibrator for Ball Screw Pair
CHEN Ye, XIE Youming, and HE Qing
In this paper, an ultrasonic anti-friction vibrator is proposed to reduce the friction of ball screw pair. The vibration exciter and the nut of ball screw pair are connected at the flange by bolts, and the friction reduction of the ball screw pair is realized by exciting the first torsional vibration mode of the anti-fIn this paper, an ultrasonic anti-friction vibrator is proposed to reduce the friction of ball screw pair. The vibration exciter and the nut of ball screw pair are connected at the flange by bolts, and the friction reduction of the ball screw pair is realized by exciting the first torsional vibration mode of the anti-friction vibrator. The modal analysis of the anti-friction vibrator is carried out using the finite element method. The orthogonal experiment on the sleeve length of the exciter, the thickness of the exciter flange and inner diameter is carried out. The best combination is obtained, and the size of the main structure is determined. A prototype is fabricated. Finally, the feasibility of the antifriction method is verified by the experiment on the prototype of the anti-friction vibrator..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 106 (2022)
Control Method of Wafer Test Process Based on GRU Neural Network
GUO Daizong, and HU Hong
The nonlinear characteristics of the output displacement of the piezoelectric actuator,such as hysteresis memory characteristics and rate-related characteristics, bring difficulties to the modeling and control of the piezoelectric actuator.This paper proposes a new output displacement control method based on the gated The nonlinear characteristics of the output displacement of the piezoelectric actuator,such as hysteresis memory characteristics and rate-related characteristics, bring difficulties to the modeling and control of the piezoelectric actuator.This paper proposes a new output displacement control method based on the gated recurrent unit(GRU).The corresponding output displacement experimental platform is set up to verify and analyze the hysteresis of the piezoelectric actuator. The GRU is used to simulate the lagging memory characteristics, and two fully connected layers are used to simulate the rate dependence. The model is an end-to-end system, in which the piezoelectric ceramics and the displacement amplification mechanism are regarded as a whole. The predicted output displacements for different input voltages show that the model has a strong generalization ability for rate-dependent lag.The same cyclic neural network structure is used to construct an inverse model and the experimental test is carried out. The experimental results show that the proposed output displacement control method effectively weakens the nonlinear characteristics of the piezoelectric actuator,which is beneficial for the combination of the linear system control method and the feedforward compensation method..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 111 (2022)
Study on Tactile Sensing Performance of an Electronic Skin
CAO Xinlin, WANG Xianjin, GUO Chengdong, LI Luyang, and BIAN Yixiang
The skin is an important organ for human beings to perceive information from the outside world. Human beings use the sense of touch produced by their skin to judge the environmental and react accordingly. The Polyvinylidene fluoride(PVDF) piezoelectric fiber with liquid core and electronic skin flexible tactile sensor The skin is an important organ for human beings to perceive information from the outside world. Human beings use the sense of touch produced by their skin to judge the environmental and react accordingly. The Polyvinylidene fluoride(PVDF) piezoelectric fiber with liquid core and electronic skin flexible tactile sensor were designed and fabricated with the PVDF as the main material. In order to test the tactile sensing performance of the electronic skin, a in the experiment, a thrust meter is used to apply pressure, which makes the piezoelectric fiber deform, as a result, the charge changes. The data are trained by the machine learning error back propagation (BP) neural network algorithm and the Classification Learner, so that the size and position of pressure can be determined by the signal size of the six fibers. The regression coefficient(R) value in the regression diagram of BP neural network is 0.87, and the area under the curve (AUC) value in the receiver operating characteristic (ROC) curve of the Classification Learner is 1. The results show that the electronic skin has high sensitivity and accurate force capture..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 118 (2022)
Study on a New Master Oscillator Power Amplification System
QIN Chong
In this study, a master oscillator power amplifier (MOPA) system based on LCP is designed. The whole system is divided into several parts, including electro-optic intensity modulator, narrow linewidth continuous seed source and so on. In the specific design process, the nanosecond pulse signal can be converted, and theIn this study, a master oscillator power amplifier (MOPA) system based on LCP is designed. The whole system is divided into several parts, including electro-optic intensity modulator, narrow linewidth continuous seed source and so on. In the specific design process, the nanosecond pulse signal can be converted, and then the corresponding Laguerre Gaussian light can be obtained. The core method used in this process is the spatial phase conversion method. Finally, the LP01 mode output of 20.1 W is obtained, and high stability is maintained. In addition, high quality radial polarized light output is obtained through LCP vortex wave plate. The repetition frequency and average power are 10 kHz and 19.5 W, respectively, and very high conversion efficiency and mode purity of 97% and 88.5% respectively are obtained. Therefore, it can achieve high power while meeting the purity requirements, showing broad application prospects..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 125 (2022)
Design of Active Control Shunt Circuit for Piezoelectric Metamaterials
LI Ze, WANG Xunbao, LIU Zhao, NI Ming, and FU Baowei
In order to further optimize the shunt circuit design of piezoelectric metamaterials, an active control circuit based on zero and pole assignment was proposed and the general rules of the zero and pole assignment were summarized. The related transfer functions were designed directly by adjusting the zeroes and poles, aIn order to further optimize the shunt circuit design of piezoelectric metamaterials, an active control circuit based on zero and pole assignment was proposed and the general rules of the zero and pole assignment were summarized. The related transfer functions were designed directly by adjusting the zeroes and poles, and realized by using the microcontroller. Because the digital controller can be remotely controlled by a computer, the band gap of metamaterials can be adjusted flexibly. This method reduces the complexity of the analog circuit, gets rid of the limitation that the parameters of the analog circuit needs to be manually adjusted, provides a new idea for the intelligent control of metamaterials, and is more convenient for practical applications. The experimental results show that the attenuation of piezoelectric metamaterials exceeds 14 dB in the low frequency mode range, which proves the effectiveness of the active control circuit used in the structure..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 130 (2022)
High Frequency Ultrasonic Transducer and Scanning Method for Ultrasound Imaging of Skin Cyst
ZHOU Jiewen, LI Xiaobing, DING Weiyan, JIANG Lixin, NIE Shengdong, CHEN Xingfei, LI Xinlun, SU Yifan, and ZHAO Xiangyong
The high-frequency ultrasound imaging has a spatial resolution of tens of microns, which is suitable for microstructure imaging of human tissues such as skin. In this paper,aiming at the internal microstructure of convex human tissue such as skin cyst, a non-contact arc ultrasonic scanning imaging method suitable for cThe high-frequency ultrasound imaging has a spatial resolution of tens of microns, which is suitable for microstructure imaging of human tissues such as skin. In this paper,aiming at the internal microstructure of convex human tissue such as skin cyst, a non-contact arc ultrasonic scanning imaging method suitable for convex tissue is proposed, and a 41.5 MHz high frequency ultrasonic transducer is designed and fabricated. First, the performance of the transducer is characterized by the pulse echo method, and a convex rotating scanning imaging device is designed. Then the signal acquisition and processing, such as scanning, filtering, compensating and so on, of the model of convex skin cyst was carried out, and finally the high frequency ultrasound imaging was realized. The results show that the proposed transducer has a longitudinal resolution of 50 μm and can image the fine structure of the skin cyst model, which will promote the development of related clinical medicine and ultrasound imaging technology..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 134 (2022)
Accurate Measurement of Refractive Index of PMN-PT Crystal1
ZHAO Weigang, CHEN Hong, LIU Xin, QIU Fusheng, HUANG Lingxiong, ZHANG Ge, WEI Xiaoyong, and XU Zhuo
The refractive index is the basic parameter of optical crystal, and the accurate determination of refractive index of crystal can provide basic calculation parameters and experimental parameters for electro-optic, acousto-optic and nonlinear applications of crystal. In order to accurately measure the refractive index cThe refractive index is the basic parameter of optical crystal, and the accurate determination of refractive index of crystal can provide basic calculation parameters and experimental parameters for electro-optic, acousto-optic and nonlinear applications of crystal. In order to accurately measure the refractive index coefficient of Pb(Mg1/3Nb2/3)O3-PbTiO3(PMN-PT) crystal in visible and near-infrared wavelengths, a laser autocollimatiion refractive index measurement system was set up.The error between the refractive index measurement results of pure lithium niobate crystal and the existing literature reports is less than 1/1 000. Using this system, the single-domain Pb(Mg1/3Nb2/3)O3-0.39PbTiO3(PMN-0.39PT) crystals with <001> polarization was measured. The refractive index and dispersion equations of single-domain PMN-0.39PT crystals at wavelengths of 594 nm,633 nm,1 150 nm and 1 520 nm were obtained,and the measurement results are consistent with the regularity of the existing literature. The results show that this method can be used to determine the refractive index of new type electro-optic crystal accurately and quickly..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 139 (2022)
Research on Thin Plate Stress Measurement Technology Based on Ultrasonic High-Order Lamb Wave
YUAN Suai, ZHAO Xiaochun, LIAO Lin, XUAN Weiming, and YUAN Maodan
In the process of manufacturing and service of the thin metal plate structure, it is usually accompanied by the residual stress and external stress. Excessive stress will cause the thin plate to deform and seriously affect the normal operation of the overall structure. The evaluation of the stress state is an importantIn the process of manufacturing and service of the thin metal plate structure, it is usually accompanied by the residual stress and external stress. Excessive stress will cause the thin plate to deform and seriously affect the normal operation of the overall structure. The evaluation of the stress state is an important index for judging whether the engineering component is safe and reliable, and the ultrasonic method is an effective non-destructive measurement method for stress. However, the current ultrasonic stress measurement technology has low sensitivity and there is little study on it. A thin plate stress measurement technology based on ultrasonic high-order Lamb waves is proposed in this paper. First, based on the finite element characteristic frequency method with Bloch-Floquet boundary and domain constraints, the acoustoelastic effect of each high-order mode of the Lamb wave is studied, and the mode sensitive to stress is selected. Then, an ultrasonic Lamb wave measurement system is built. The A1 mode at a specific frequency is excited and the stress calibration is carried out in a uniform thin plate. Finally, the stress detection was carried out in the non-uniform thin plate, the stress at different positions in the thin plate is successfully detected, and the maximum stress error was 15 MPa. The results show that this work verifies the proposed thin plate stress measurement technology based on ultrasonic high-order Lamb wave from the theoretical and experimental aspects, and the stress in metal plate can be measured accurately..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 144 (2022)
Research on Metal Surface Crack Monitoring Based on RFID Antenna Sensor
HUANG Dong, DONG Lihong, WANG Haidou, XU Yawei, ZHAO Yuncai, and WANG Huipeng
In order to explore the dynamic monitoring ability of surface crack propagation based on radio frequency identification(RFID) tag sensor, a new crack propagation test method is designed by using microstrip tag antenna as crack sensor and its backscattered signal as crack growth characterization parameter. In this methoIn order to explore the dynamic monitoring ability of surface crack propagation based on radio frequency identification(RFID) tag sensor, a new crack propagation test method is designed by using microstrip tag antenna as crack sensor and its backscattered signal as crack growth characterization parameter. In this method, the actual size of surface crack in propagation is obtained by the crack front marking technique, and the relationship between the size of surface crack and the phase of backscatter ed signal is established. The experimental results show that the sensor can sense the crack growth of 5.646 mm2, theoretically it can achieve a monitoring sensitivity of 0.195 (°)/mm2, achieving the purpose of dynamic monitoring..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 151 (2022)
Design of Surface Acoustic Wave Current Sensor Based on FeGa Film
SUN Yuan, JIA Yana, ZHANG Yufeng, LIANG Yong, and WANG Wen
Using the FeGa magnetostrictive film as the sensitive material, a surface acoustic wave (SAW) current sensor with high sensitivity is designed and optimized. It is fabricated by using a SAW delay line with a center frequency of 150 MHz as the sensing element, and the FeGa thin film is deposited on the surface of the SAUsing the FeGa magnetostrictive film as the sensitive material, a surface acoustic wave (SAW) current sensor with high sensitivity is designed and optimized. It is fabricated by using a SAW delay line with a center frequency of 150 MHz as the sensing element, and the FeGa thin film is deposited on the surface of the SAW propagation path of the delay line using radio frequency (RF) magnetically controlled sputtering method. The developed sensor is connected to an oscillation circuit composed of an amplifier and a mixer, and the output signal is used as a sensing signal by making a difference with the uncoated reference device. Under the action of the electromagnetic field, the magnetostrictive effect produced by the FeGa film causes a change in the propagation velocity of the SAW, and finally the applied current is evaluated with the corresponding differential oscillation frequency offset. In order to further improve the performance of the sensor, the optimized preparation conditions are determined by controlling the preparation processes such as different sputtering power and annealing heat treatment. The experimental results show that when the FeGa film thickness is 500 nm, sputtering power is 100 W, and annealing temperature is 300 ℃, the current sensor has good linearity, repeatability and high sensitivity (up to 24.67 kHz/A)..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 157 (2022)
Framework Design and Engineering Implementation of Monitoring Equipment for Underground Infrastructure
LIAO Songlin, WANG Lu, HU Cong, CHEN Chao, ZENG Xiangbao, WEN Jingxiao, and WANG Fei
In order to deal with the information acquisition of multi-source heterogeneous sensors in the complex environment of underground infrastructure, a bus-based information processing framework for data acquisition, transmission, processing and uploading is designed based on the Real Time-Thread internet of things operatiIn order to deal with the information acquisition of multi-source heterogeneous sensors in the complex environment of underground infrastructure, a bus-based information processing framework for data acquisition, transmission, processing and uploading is designed based on the Real Time-Thread internet of things operating system in this paper. By designing the sensor insertion active monitoring and identification mechanism, sensor operation scheduling and data acquisition mechanism, and different forms of sensor information encoding, the abilities of the plug-and-play equipment according to the application scenario, sensor data structure with different principles, multi-sensor online scheduling and strong adaptability to underground complex environment are realized. The environmental test and demonstration deployment in subway station show that the integrated monitoring equipment for underground infrastructure designed in this paper has good index expansion performance, reliable on-site operation ability, and stable sensor data collection and uploading abilities..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 161 (2022)
Algorithm of Rotating GNSS Dual Antenna/MIMU Tight Integrated System
CAI Tijing, ZHAO Zichao, and ZHANG Chunxia
In order to improve the orientation accuracy of the rotating GNSS short-baseline dual-antenna/MIMU integrated system, its tight integrated system is constructed in this paper. In the tight integrated algorithm, the pseudorange, pseudorange rate and carrier phase of the GNSS are taken as the observations of the rotatingIn order to improve the orientation accuracy of the rotating GNSS short-baseline dual-antenna/MIMU integrated system, its tight integrated system is constructed in this paper. In the tight integrated algorithm, the pseudorange, pseudorange rate and carrier phase of the GNSS are taken as the observations of the rotating GNSS dual-antenna/MIMU integrated system. The extended Kalman filtering is used for the estimation, and the estimated stat quantity is used for the closed-loop feedback in the system, and finally the orientation result of the integrated system is obtained. The tight integrated off-line calculation of the ship-borne test data of the rotating GNSS dual-antenna/MIMU integrated system is carried out. The results show that when the GNSS baseline is 0.3 m, the heading error of the integrated system is less than 1°, and the pitch and roll angle errors are less than 0.1°..
Piezoelectrics & Acoustooptics
- Publication Date: Mar. 16, 2022
- Vol. 44, Issue 1, 166 (2022)