The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform

Weishan Chen - One of the best experts on this subject based on the ideXlab platform.

  • An electromechanical coupling model of a Bending Vibration type piezoelectric ultrasonic transducer.
    Ultrasonics, 2015
    Co-Authors: Qiang Zhang, Shengjun Shi, Weishan Chen
    Abstract:

    An electromechanical coupling model of a Bending Vibration type piezoelectric ultrasonic transducer is proposed. The transducer is a Langevin type transducer which is composed of an exponential horn, four groups of PZT ceramics and a back beam. The exponential horn can focus the Vibration energy, and can enlarge Vibration amplitude and velocity efficiently. A Bending Vibration model of the transducer is first constructed, and subsequently an electromechanical coupling model is constructed based on the Vibration model. In order to obtain the most suitable excitation position of the PZT ceramics, the effective electromechanical coupling coefficient is optimized by means of the quadratic interpolation method. When the effective electromechanical coupling coefficient reaches the peak value of 42.59%, the optimal excitation position (L1=22.52 mm) is found. The FEM method and the experimental method are used to validate the developed analytical model. Two groups of the FEM model (the Group A center bolt is not considered, and but the Group B center bolt is considered) are constructed and separately compared with the analytical model and the experimental model. Four prototype transducers around the peak value are fabricated and tested to validate the analytical model. A scanning laser Doppler vibrometer is employed to test the Bending Vibration shape and resonance frequency. Finally, the electromechanical coupling coefficient is tested indirectly through an impedance analyzer. Comparisons of the analytical results, FEM results and experiment results are presented, and the results show good agreement.

  • Vibration characteristic analysis of a piezoelectric transducer using first Bending Vibration modes
    2015 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF) International Symposium on Integrated Functionalities (ISIF) and P, 2015
    Co-Authors: Yingxiang Liu, Junkao Liu, Weishan Chen
    Abstract:

    Apiezoelectric transducer using first Bending Vibration modes is proposed in this paper; it can be used as a stator for an ultrasonic motor. The transducer has a symmetrical structure, in which a conical horn is located at one end. On the tip of the horn, a cylindrical driving foot is machined. Bending Vibrations are superimposed in the transducer to generate elliptical trajectory movement at the driving foot. The working principle of the proposed transducer is analyzed. The resonant frequencies and the electromechanical coupling factor of the Bending modes are analyzed under different structural parameters. An improved structure for the initial model is proposed. The motion trajectory of the driving foot is obtained by transient analysis. The results can be a theoretical guidance for the design of piezoelectric actuator using Bending transducer.

  • Research on Effective Electric-Mechanical Coupling Coefficient of Sandwich Type Piezoelectric Ultrasonic Transducer Using Bending Vibration Mode
    Advances in Mechanical Engineering, 2014
    Co-Authors: Qiang Zhang, Shengjun Shi, Weishan Chen
    Abstract:

    An analytical model on electromechanical coupling coefficient and the length optimization of a Bending piezoelectric ultrasonic transducer are proposed. The piezoelectric transducer consists of 8 PZT elements sandwiched between four thin electrodes, and the PZT elements are clamped by a screwed connection between fore beam and back beam. Firstly, Bending Vibration model of the piezoelectric transducer is built based on the Timoshenko beam theory. Secondly, the analytical model of effective electromechanical coupling coefficient is built based on the Bending Vibration model. Energy method and electromechanical equivalent circuit method are involved in the modelling process. To validate the analytical model, sandwich type piezoelectric transducer example in second order Bending Vibration mode is analysed. Effective electromechanical coupling coefficient of the transducer is optimized with simplex reflection technique, and the optimized ratio of length of the transducers is obtained. Finally, experimental pr...

  • Modeling and Simulation of the Ultrasonic Motor which Using Bending Vibration Transducer
    Applied Mechanics and Materials, 2014
    Co-Authors: Zi Li Huang, Weishan Chen
    Abstract:

    Build the mathematical model and mechanical model of ultrasonic motor which using Bending Vibration transducer. Based on this model, analyze the contact and friction processes between driven-foot which belonging to ultrasonic motor which using Bending Vibration transducer and guide rail. Analyze the influence preload force make to the process of motor’s running. Take the cases of stick, slip, flight into consideration, and explain nonlinearity of the Dynamics. Do computer simulations of starting process though this model, and summarize the motor’s working results when it works under different conditions.

  • A Rotary Piezoelectric Actuator Using the Third and Fourth Bending Vibration Modes
    IEEE Transactions on Industrial Electronics, 2014
    Co-Authors: Yingxiang Liu, Weishan Chen, Xiaohui Yang, Junkao Liu
    Abstract:

    A piezoelectric actuator using the third and fourth Bending Vibration modes was proposed, designed, fabricated and tested with the aim of accomplishing rotary driving by boltclamped transducer. By superimposing the third and fourth Bending Vibrations, elliptical movements are formed on the two leading ends of the actuator. When a ring type rotor is in contact with the two diving tips and the vertical preload is applied, the horizontal movements of the driving tips generated by the third Bending Vibration will push the rotor into motion by frictional forces while the vertical movements produced by the fourth Bending Vibration will overcome the preload. A method of tuning the resonance frequency of the third Bending mode to the fourth Bending one was discussed. The horn shape was adjusted to make the two Bending modes have nearly uniform frequencies. The Vibration characteristic and mechanical ability of a prototype were tested, and the tested resonance frequencies agreed well with the calculated ones. The prototype achieved maximum speed and torque of 86 r/min and 2.5 Nm, respectively.

Qiang Zhang - One of the best experts on this subject based on the ideXlab platform.

  • An electromechanical coupling model of a Bending Vibration type piezoelectric ultrasonic transducer.
    Ultrasonics, 2015
    Co-Authors: Qiang Zhang, Shengjun Shi, Weishan Chen
    Abstract:

    An electromechanical coupling model of a Bending Vibration type piezoelectric ultrasonic transducer is proposed. The transducer is a Langevin type transducer which is composed of an exponential horn, four groups of PZT ceramics and a back beam. The exponential horn can focus the Vibration energy, and can enlarge Vibration amplitude and velocity efficiently. A Bending Vibration model of the transducer is first constructed, and subsequently an electromechanical coupling model is constructed based on the Vibration model. In order to obtain the most suitable excitation position of the PZT ceramics, the effective electromechanical coupling coefficient is optimized by means of the quadratic interpolation method. When the effective electromechanical coupling coefficient reaches the peak value of 42.59%, the optimal excitation position (L1=22.52 mm) is found. The FEM method and the experimental method are used to validate the developed analytical model. Two groups of the FEM model (the Group A center bolt is not considered, and but the Group B center bolt is considered) are constructed and separately compared with the analytical model and the experimental model. Four prototype transducers around the peak value are fabricated and tested to validate the analytical model. A scanning laser Doppler vibrometer is employed to test the Bending Vibration shape and resonance frequency. Finally, the electromechanical coupling coefficient is tested indirectly through an impedance analyzer. Comparisons of the analytical results, FEM results and experiment results are presented, and the results show good agreement.

  • Research on Effective Electric-Mechanical Coupling Coefficient of Sandwich Type Piezoelectric Ultrasonic Transducer Using Bending Vibration Mode
    Advances in Mechanical Engineering, 2014
    Co-Authors: Qiang Zhang, Shengjun Shi, Weishan Chen
    Abstract:

    An analytical model on electromechanical coupling coefficient and the length optimization of a Bending piezoelectric ultrasonic transducer are proposed. The piezoelectric transducer consists of 8 PZT elements sandwiched between four thin electrodes, and the PZT elements are clamped by a screwed connection between fore beam and back beam. Firstly, Bending Vibration model of the piezoelectric transducer is built based on the Timoshenko beam theory. Secondly, the analytical model of effective electromechanical coupling coefficient is built based on the Bending Vibration model. Energy method and electromechanical equivalent circuit method are involved in the modelling process. To validate the analytical model, sandwich type piezoelectric transducer example in second order Bending Vibration mode is analysed. Effective electromechanical coupling coefficient of the transducer is optimized with simplex reflection technique, and the optimized ratio of length of the transducers is obtained. Finally, experimental pr...

  • Study on analytical modelling of sandwich type piezoelectric transducer using Bending Vibration mode
    2012 IEEE International Conference on Mechatronics and Automation, 2012
    Co-Authors: Qiang Zhang, Shengjun Shi, Weishan Chen
    Abstract:

    In this paper, an analytical model of sandwich type piezoelectric transducer using Bending Vibration mode is presented. The piezoelectric transducer is simplified as a constant cross section composite beam with free-free boundary condition. The Timoshenko beam theory is involved in the analytical modelling of piezoelectric transducer, and structure parameters sensitivity of Bending resonant frequency are obtained. The analytical model is validated by comparing against the result of finite element method. The first three order resonant frequencies and Vibration curves of Bending mode are obtained. The analytical model provides a theoretical basis for designing and optimization of the sandwich type piezoelectric transducer using Bending Vibration mode.

Shengjun Shi - One of the best experts on this subject based on the ideXlab platform.

  • An electromechanical coupling model of a Bending Vibration type piezoelectric ultrasonic transducer.
    Ultrasonics, 2015
    Co-Authors: Qiang Zhang, Shengjun Shi, Weishan Chen
    Abstract:

    An electromechanical coupling model of a Bending Vibration type piezoelectric ultrasonic transducer is proposed. The transducer is a Langevin type transducer which is composed of an exponential horn, four groups of PZT ceramics and a back beam. The exponential horn can focus the Vibration energy, and can enlarge Vibration amplitude and velocity efficiently. A Bending Vibration model of the transducer is first constructed, and subsequently an electromechanical coupling model is constructed based on the Vibration model. In order to obtain the most suitable excitation position of the PZT ceramics, the effective electromechanical coupling coefficient is optimized by means of the quadratic interpolation method. When the effective electromechanical coupling coefficient reaches the peak value of 42.59%, the optimal excitation position (L1=22.52 mm) is found. The FEM method and the experimental method are used to validate the developed analytical model. Two groups of the FEM model (the Group A center bolt is not considered, and but the Group B center bolt is considered) are constructed and separately compared with the analytical model and the experimental model. Four prototype transducers around the peak value are fabricated and tested to validate the analytical model. A scanning laser Doppler vibrometer is employed to test the Bending Vibration shape and resonance frequency. Finally, the electromechanical coupling coefficient is tested indirectly through an impedance analyzer. Comparisons of the analytical results, FEM results and experiment results are presented, and the results show good agreement.

  • Research on Effective Electric-Mechanical Coupling Coefficient of Sandwich Type Piezoelectric Ultrasonic Transducer Using Bending Vibration Mode
    Advances in Mechanical Engineering, 2014
    Co-Authors: Qiang Zhang, Shengjun Shi, Weishan Chen
    Abstract:

    An analytical model on electromechanical coupling coefficient and the length optimization of a Bending piezoelectric ultrasonic transducer are proposed. The piezoelectric transducer consists of 8 PZT elements sandwiched between four thin electrodes, and the PZT elements are clamped by a screwed connection between fore beam and back beam. Firstly, Bending Vibration model of the piezoelectric transducer is built based on the Timoshenko beam theory. Secondly, the analytical model of effective electromechanical coupling coefficient is built based on the Bending Vibration model. Energy method and electromechanical equivalent circuit method are involved in the modelling process. To validate the analytical model, sandwich type piezoelectric transducer example in second order Bending Vibration mode is analysed. Effective electromechanical coupling coefficient of the transducer is optimized with simplex reflection technique, and the optimized ratio of length of the transducers is obtained. Finally, experimental pr...

  • Study on analytical modelling of sandwich type piezoelectric transducer using Bending Vibration mode
    2012 IEEE International Conference on Mechatronics and Automation, 2012
    Co-Authors: Qiang Zhang, Shengjun Shi, Weishan Chen
    Abstract:

    In this paper, an analytical model of sandwich type piezoelectric transducer using Bending Vibration mode is presented. The piezoelectric transducer is simplified as a constant cross section composite beam with free-free boundary condition. The Timoshenko beam theory is involved in the analytical modelling of piezoelectric transducer, and structure parameters sensitivity of Bending resonant frequency are obtained. The analytical model is validated by comparing against the result of finite element method. The first three order resonant frequencies and Vibration curves of Bending mode are obtained. The analytical model provides a theoretical basis for designing and optimization of the sandwich type piezoelectric transducer using Bending Vibration mode.

  • a linear ultrasonic motor using Bending Vibration transducer with double driving feet
    Ferroelectrics, 2010
    Co-Authors: Weishan Chen, Yingxiang Liu, Junkao Liu, Shengjun Shi
    Abstract:

    A linear ultrasonic motor using Bending Vibration transducer with double driving feet was proposed. The motor consists of two exponential shape horns located on the two leading ends. Two orthogonal Bending Vibrations are superimposed in the motor and generate elliptical trajectories at the driving feet. The motion trajectories of the driving feet were deduced. Transient analysis was developed to gain the Vibration characteristics of motor. A prototype motor was fabricated and measured. Typical output of the prototype is no-load speed of 990 mm/s and maximum thrust force of 12 N at a voltage of 150 Vrms.

  • A rotary ultrasonic motor using Bending Vibration transducers
    IEEE transactions on ultrasonics ferroelectrics and frequency control, 2010
    Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Shengjun Shi
    Abstract:

    A rotary ultrasonic motor using Bending Vibration transducers is proposed. In each transducer, two orthogonal Bending Vibrations are superimposed and an elliptical trajectory is generated at the driving foot. Typical output of the prototype is a no-load speed of 58 rpm and maximum torque of 9·5 Nm under an exciting voltage of 200 V(rms).

Yingxiang Liu - One of the best experts on this subject based on the ideXlab platform.

  • Vibration characteristic analysis of a piezoelectric transducer using first Bending Vibration modes
    2015 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF) International Symposium on Integrated Functionalities (ISIF) and P, 2015
    Co-Authors: Yingxiang Liu, Junkao Liu, Weishan Chen
    Abstract:

    Apiezoelectric transducer using first Bending Vibration modes is proposed in this paper; it can be used as a stator for an ultrasonic motor. The transducer has a symmetrical structure, in which a conical horn is located at one end. On the tip of the horn, a cylindrical driving foot is machined. Bending Vibrations are superimposed in the transducer to generate elliptical trajectory movement at the driving foot. The working principle of the proposed transducer is analyzed. The resonant frequencies and the electromechanical coupling factor of the Bending modes are analyzed under different structural parameters. An improved structure for the initial model is proposed. The motion trajectory of the driving foot is obtained by transient analysis. The results can be a theoretical guidance for the design of piezoelectric actuator using Bending transducer.

  • A Rotary Piezoelectric Actuator Using the Third and Fourth Bending Vibration Modes
    IEEE Transactions on Industrial Electronics, 2014
    Co-Authors: Yingxiang Liu, Weishan Chen, Xiaohui Yang, Junkao Liu
    Abstract:

    A piezoelectric actuator using the third and fourth Bending Vibration modes was proposed, designed, fabricated and tested with the aim of accomplishing rotary driving by boltclamped transducer. By superimposing the third and fourth Bending Vibrations, elliptical movements are formed on the two leading ends of the actuator. When a ring type rotor is in contact with the two diving tips and the vertical preload is applied, the horizontal movements of the driving tips generated by the third Bending Vibration will push the rotor into motion by frictional forces while the vertical movements produced by the fourth Bending Vibration will overcome the preload. A method of tuning the resonance frequency of the third Bending mode to the fourth Bending one was discussed. The horn shape was adjusted to make the two Bending modes have nearly uniform frequencies. The Vibration characteristic and mechanical ability of a prototype were tested, and the tested resonance frequencies agreed well with the calculated ones. The prototype achieved maximum speed and torque of 86 r/min and 2.5 Nm, respectively.

  • a high power linear ultrasonic motor using Bending Vibration transducer
    IEEE Transactions on Industrial Electronics, 2013
    Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Xiaohui Yang
    Abstract:

    To overcome the modal degeneration problem that commonly exists in the design of ultrasonic motors (USMs) using composite Vibration modes, a high-power linear USM using a Bending Vibration transducer is proposed in this paper. In this new design, two orthogonal Bending Vibration modes with the same order are superimposed in the motor and generate elliptical motions at the two driving feet. Square cross-section structure is adopted by the motor to ensure that the two Bending modes have the same resonance frequency. After the introduction of the working principle, the motor is analyzed by using finite-element method. A prototype motor is fabricated and measured. Typical output of the prototype is a no-load speed of 1527 mm/s and a maximum thrust force of 50 N at a voltage of 200 Vrms. This study verifies the feasibility of the proposed design and provides a way to improve the output power of USMs.

  • a linear ultrasonic motor using Bending Vibration transducer with double driving feet
    Ferroelectrics, 2010
    Co-Authors: Weishan Chen, Yingxiang Liu, Junkao Liu, Shengjun Shi
    Abstract:

    A linear ultrasonic motor using Bending Vibration transducer with double driving feet was proposed. The motor consists of two exponential shape horns located on the two leading ends. Two orthogonal Bending Vibrations are superimposed in the motor and generate elliptical trajectories at the driving feet. The motion trajectories of the driving feet were deduced. Transient analysis was developed to gain the Vibration characteristics of motor. A prototype motor was fabricated and measured. Typical output of the prototype is no-load speed of 990 mm/s and maximum thrust force of 12 N at a voltage of 150 Vrms.

  • A rotary ultrasonic motor using Bending Vibration transducers
    IEEE transactions on ultrasonics ferroelectrics and frequency control, 2010
    Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Shengjun Shi
    Abstract:

    A rotary ultrasonic motor using Bending Vibration transducers is proposed. In each transducer, two orthogonal Bending Vibrations are superimposed and an elliptical trajectory is generated at the driving foot. Typical output of the prototype is a no-load speed of 58 rpm and maximum torque of 9·5 Nm under an exciting voltage of 200 V(rms).

Junkao Liu - One of the best experts on this subject based on the ideXlab platform.

  • Vibration characteristic analysis of a piezoelectric transducer using first Bending Vibration modes
    2015 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF) International Symposium on Integrated Functionalities (ISIF) and P, 2015
    Co-Authors: Yingxiang Liu, Junkao Liu, Weishan Chen
    Abstract:

    Apiezoelectric transducer using first Bending Vibration modes is proposed in this paper; it can be used as a stator for an ultrasonic motor. The transducer has a symmetrical structure, in which a conical horn is located at one end. On the tip of the horn, a cylindrical driving foot is machined. Bending Vibrations are superimposed in the transducer to generate elliptical trajectory movement at the driving foot. The working principle of the proposed transducer is analyzed. The resonant frequencies and the electromechanical coupling factor of the Bending modes are analyzed under different structural parameters. An improved structure for the initial model is proposed. The motion trajectory of the driving foot is obtained by transient analysis. The results can be a theoretical guidance for the design of piezoelectric actuator using Bending transducer.

  • A Rotary Piezoelectric Actuator Using the Third and Fourth Bending Vibration Modes
    IEEE Transactions on Industrial Electronics, 2014
    Co-Authors: Yingxiang Liu, Weishan Chen, Xiaohui Yang, Junkao Liu
    Abstract:

    A piezoelectric actuator using the third and fourth Bending Vibration modes was proposed, designed, fabricated and tested with the aim of accomplishing rotary driving by boltclamped transducer. By superimposing the third and fourth Bending Vibrations, elliptical movements are formed on the two leading ends of the actuator. When a ring type rotor is in contact with the two diving tips and the vertical preload is applied, the horizontal movements of the driving tips generated by the third Bending Vibration will push the rotor into motion by frictional forces while the vertical movements produced by the fourth Bending Vibration will overcome the preload. A method of tuning the resonance frequency of the third Bending mode to the fourth Bending one was discussed. The horn shape was adjusted to make the two Bending modes have nearly uniform frequencies. The Vibration characteristic and mechanical ability of a prototype were tested, and the tested resonance frequencies agreed well with the calculated ones. The prototype achieved maximum speed and torque of 86 r/min and 2.5 Nm, respectively.

  • a high power linear ultrasonic motor using Bending Vibration transducer
    IEEE Transactions on Industrial Electronics, 2013
    Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Xiaohui Yang
    Abstract:

    To overcome the modal degeneration problem that commonly exists in the design of ultrasonic motors (USMs) using composite Vibration modes, a high-power linear USM using a Bending Vibration transducer is proposed in this paper. In this new design, two orthogonal Bending Vibration modes with the same order are superimposed in the motor and generate elliptical motions at the two driving feet. Square cross-section structure is adopted by the motor to ensure that the two Bending modes have the same resonance frequency. After the introduction of the working principle, the motor is analyzed by using finite-element method. A prototype motor is fabricated and measured. Typical output of the prototype is a no-load speed of 1527 mm/s and a maximum thrust force of 50 N at a voltage of 200 Vrms. This study verifies the feasibility of the proposed design and provides a way to improve the output power of USMs.

  • a linear ultrasonic motor using Bending Vibration transducer with double driving feet
    Ferroelectrics, 2010
    Co-Authors: Weishan Chen, Yingxiang Liu, Junkao Liu, Shengjun Shi
    Abstract:

    A linear ultrasonic motor using Bending Vibration transducer with double driving feet was proposed. The motor consists of two exponential shape horns located on the two leading ends. Two orthogonal Bending Vibrations are superimposed in the motor and generate elliptical trajectories at the driving feet. The motion trajectories of the driving feet were deduced. Transient analysis was developed to gain the Vibration characteristics of motor. A prototype motor was fabricated and measured. Typical output of the prototype is no-load speed of 990 mm/s and maximum thrust force of 12 N at a voltage of 150 Vrms.

  • A rotary ultrasonic motor using Bending Vibration transducers
    IEEE transactions on ultrasonics ferroelectrics and frequency control, 2010
    Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Shengjun Shi
    Abstract:

    A rotary ultrasonic motor using Bending Vibration transducers is proposed. In each transducer, two orthogonal Bending Vibrations are superimposed and an elliptical trajectory is generated at the driving foot. Typical output of the prototype is a no-load speed of 58 rpm and maximum torque of 9·5 Nm under an exciting voltage of 200 V(rms).