The Experts below are selected from a list of 23994 Experts worldwide ranked by ideXlab platform
Weishan Chen - One of the best experts on this subject based on the ideXlab platform.
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An Electromechanical Coupling model of a bending vibration type piezoelectric ultrasonic transducer.
Ultrasonics, 2015Co-Authors: Qiang Zhang, Shengjun Shi, Weishan ChenAbstract: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.
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an Electromechanical Coupling model of a longitudinal vibration type piezoelectric ultrasonic transducer
Ceramics International, 2015Co-Authors: Qiang Zhang, Weishan ChenAbstract:Abstract In this study, an Electromechanical Coupling model of a longitudinal vibration type piezoelectric ultrasonic transducer is derived. The transducer is a langevin type transducer with an exponential horn which can efficiently focus energy to enlarge vibration amplitude and velocity. Firstly, vibration model of the transducer is built. Vibration shape and resonance frequency of the transducer is obtained. Secondly, based on the vibration model, effective Electromechanical Coupling model is built. Effective Electromechanical Coupling coefficient is obtained by combining energy method and equivalent circuit method. Furthermore, the influences of PZT ceramics position on effective Electromechanical Coupling coefficient and resonance frequency are studied, and the regularity of Electromechanical Coupling coefficient and resonance frequency versus PZT ceramics position is obtained. Meanwhile, the peak value of effective Electromechanical Coupling coefficient (34.51%) with its corresponding PZT ceramics position (L1=46 mm) are obtained. Around the peak value, five prototype transducers are fabricated and tested to validate the vibration model and Electromechanical Coupling model. Vibration shape and resonance frequency are tested with a scanning laser Doppler vibrometer. Electromechanical Coupling coefficient is calculated from the testing result of impedance characteristics. At last, comparison between the results of analytical model and experiments are carried out. The comparison indicates that experimental results of resonance frequency and effective Electromechanical Coupling coefficient are in good agreement with the analytical ones, with the maximum errors 0.673 kHz and 0.83%, separately.
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Study on Electromechanical Coupling model of piezoelectric ultrasonic transducer
2013 IEEE International Conference on Mechatronics and Automation, 2013Co-Authors: Pengfei Wang, Weishan Chen, Junkao Liu, Qiang ZhangAbstract:In this paper, an Electromechanical Coupling model of piezoelectric ultrasonic transducer is proposed. The structure of piezoelectric ultrasonic transducer is designed to be a sandwich type piezoelectric-metal composite beam with an exponential variable cross section working at second-order bending vibration mode. Then, the bending vibration model is solved by way of the Timoshenko beam theory. According to vibration model and Electromechanical equivalent diagram, the effective Electromechanical Coupling factor of piezoelectric ultrasonic transducer is obtained. When overall size of the transducer remains unchanged, the influence of piezoelectric ceramics to effective Electromechanical Coupling factor is studied by changing the position of piezoelectric ceramics. The most reasonable transducer structure is got by optimizing the structure of transducer. By using FEA, the proposed analytical model is analysed and validated.
Qiang Zhang - One of the best experts on this subject based on the ideXlab platform.
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An Electromechanical Coupling model of a bending vibration type piezoelectric ultrasonic transducer.
Ultrasonics, 2015Co-Authors: Qiang Zhang, Shengjun Shi, Weishan ChenAbstract: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.
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an Electromechanical Coupling model of a longitudinal vibration type piezoelectric ultrasonic transducer
Ceramics International, 2015Co-Authors: Qiang Zhang, Weishan ChenAbstract:Abstract In this study, an Electromechanical Coupling model of a longitudinal vibration type piezoelectric ultrasonic transducer is derived. The transducer is a langevin type transducer with an exponential horn which can efficiently focus energy to enlarge vibration amplitude and velocity. Firstly, vibration model of the transducer is built. Vibration shape and resonance frequency of the transducer is obtained. Secondly, based on the vibration model, effective Electromechanical Coupling model is built. Effective Electromechanical Coupling coefficient is obtained by combining energy method and equivalent circuit method. Furthermore, the influences of PZT ceramics position on effective Electromechanical Coupling coefficient and resonance frequency are studied, and the regularity of Electromechanical Coupling coefficient and resonance frequency versus PZT ceramics position is obtained. Meanwhile, the peak value of effective Electromechanical Coupling coefficient (34.51%) with its corresponding PZT ceramics position (L1=46 mm) are obtained. Around the peak value, five prototype transducers are fabricated and tested to validate the vibration model and Electromechanical Coupling model. Vibration shape and resonance frequency are tested with a scanning laser Doppler vibrometer. Electromechanical Coupling coefficient is calculated from the testing result of impedance characteristics. At last, comparison between the results of analytical model and experiments are carried out. The comparison indicates that experimental results of resonance frequency and effective Electromechanical Coupling coefficient are in good agreement with the analytical ones, with the maximum errors 0.673 kHz and 0.83%, separately.
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Study on Electromechanical Coupling model of piezoelectric ultrasonic transducer
2013 IEEE International Conference on Mechatronics and Automation, 2013Co-Authors: Pengfei Wang, Weishan Chen, Junkao Liu, Qiang ZhangAbstract:In this paper, an Electromechanical Coupling model of piezoelectric ultrasonic transducer is proposed. The structure of piezoelectric ultrasonic transducer is designed to be a sandwich type piezoelectric-metal composite beam with an exponential variable cross section working at second-order bending vibration mode. Then, the bending vibration model is solved by way of the Timoshenko beam theory. According to vibration model and Electromechanical equivalent diagram, the effective Electromechanical Coupling factor of piezoelectric ultrasonic transducer is obtained. When overall size of the transducer remains unchanged, the influence of piezoelectric ceramics to effective Electromechanical Coupling factor is studied by changing the position of piezoelectric ceramics. The most reasonable transducer structure is got by optimizing the structure of transducer. By using FEA, the proposed analytical model is analysed and validated.
Lars Hultman - One of the best experts on this subject based on the ideXlab platform.
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increased Electromechanical Coupling in w scxal1 xn
Applied Physics Letters, 2010Co-Authors: Gunilla Wingqvist, Ferenc Tasnádi, Agne Zukauskaite, Jens Birch, Hans Arwin, Lars HultmanAbstract:AlN is challenged as the material choice in important thin film electroacoustic devices for modern wireless communication applications. We present the promise of superior Electromechanical Coupling ...
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Increased Electromechanical Coupling in w−ScxAl1−xN
Applied Physics Letters, 2010Co-Authors: Gunilla Wingqvist, Ferenc Tasnádi, Agne Zukauskaite, Jens Birch, Hans Arwin, Lars HultmanAbstract:AlN is challenged as the material choice in important thin film electroacoustic devices for modern wireless communication applications. We present the promise of superior Electromechanical Coupling ...
Masashi Suzuki - One of the best experts on this subject based on the ideXlab platform.
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Electromechanical Coupling and gigahertz elastic properties of scaln films near phase boundary
Applied Physics Letters, 2014Co-Authors: Takahiko Yanagitani, Masashi SuzukiAbstract:The Electromechanical Coupling, elastic properties, and temperature coefficient of elastic constant c33D of ScxAl(1−x)N films with high Sc concentration (x) of 0–0.70 were experimentally investigated. Near the phase boundary, a Sc0.41Al0.59N film exhibited a maximum thickness extensional mode Electromechanical Coupling coefficient kt2 of 12% (kt = 0.35), which is almost double the value of 6.4% for typical pure AlN films. In the region of 0 < x < 0.2, the Electromechanical Coupling was confirmed to increase without any detectable deterioration in the temperature stability of c33D (=−54.5 ppm/ °C). This region is favorable in terms of temperature stability and is suitable for wideband resonator filter applications.
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Electromechanical Coupling and gigahertz elastic properties of ScAlN films near phase boundary
Applied Physics Letters, 2014Co-Authors: Takahiko Yanagitani, Masashi SuzukiAbstract:The Electromechanical Coupling, elastic properties, and temperature coefficient of elastic constant c33D of ScxAl(1−x)N films with high Sc concentration (x) of 0–0.70 were experimentally investigated. Near the phase boundary, a Sc0.41Al0.59N film exhibited a maximum thickness extensional mode Electromechanical Coupling coefficient kt2 of 12% (kt = 0.35), which is almost double the value of 6.4% for typical pure AlN films. In the region of 0
Gunilla Wingqvist - One of the best experts on this subject based on the ideXlab platform.
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increased Electromechanical Coupling in w scxal1 xn
Applied Physics Letters, 2010Co-Authors: Gunilla Wingqvist, Ferenc Tasnádi, Agne Zukauskaite, Jens Birch, Hans Arwin, Lars HultmanAbstract:AlN is challenged as the material choice in important thin film electroacoustic devices for modern wireless communication applications. We present the promise of superior Electromechanical Coupling ...
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Increased Electromechanical Coupling in w−ScxAl1−xN
Applied Physics Letters, 2010Co-Authors: Gunilla Wingqvist, Ferenc Tasnádi, Agne Zukauskaite, Jens Birch, Hans Arwin, Lars HultmanAbstract:AlN is challenged as the material choice in important thin film electroacoustic devices for modern wireless communication applications. We present the promise of superior Electromechanical Coupling ...