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A deep-sea resonant sandwich linear ultrasonic motor is proposed and designed. We determine the parameter of its structure by finite-element analysis. The piezoelectric actuator adopts compound vibration mode of fifth order bending vibration and second order longitudinal. The mode degeneracy of that is completed. We manufacture the prototype to measure the performance of it. We measure its vibration mode and resonant frequency. The velocity of prototype can reach 264.5 mm/s while the water pressure is 8 MPa and the voltage signal with frequency of 30.30 kHz and voltage amplitude of 150 V.

Piezoelectric actuator is a kind of new motor which using inverse piezoelectric effect of piezoelectric ceramics [

In this study, we design a deep-sea resonant sandwich linear ultrasonic motor and manufacture the prototype to measure its performance. The piezoelectric actuator adopts compound vibration mode of fifth order bending vibration and second order longitudinal. We complete the mode degeneracy by finite element analysis. We design and set up the experimental platform to measure the performance of prototype. The velocity of prototype can reach 264.5 mm/s while the water pressure is 8 MPa and the voltage signal with frequency of 30.30 kHz and voltage amplitude of 150 V. It verifies the simulation result and reaches the experiment objective.

We select a configuration to build finite element model as show in

d | l_{r} | t_{b} | t_{l} | t_{s} | w_{f} | l_{h} | l_{b} |
---|---|---|---|---|---|---|---|

35 | 20 | 6 | 6 | 8 | 8.5 | 37.5 | 6 |

After it, the finite element model under water is built to obtain the resonant frequency as shown in

Resonant frequency in air | Resonant frequency in water | Differentials | |
---|---|---|---|

bending vibration (kHz) | 30.730 | 30.214 | 0.516 |

longitudinal vibration (kHz) | 30.588 | 30.478 | 0.110 |

pressure (Mpa) | 2 | 4 | 8 | 12 | 16 | 20 |
---|---|---|---|---|---|---|

bending vibration (kHz) | 30.201 | 30.178 | 30.156 | 30.132 | 30.109 | 30.088 |

longitudinal vibration (kHz) | 30.474 | 30.470 | 30.464 | 30.456 | 30.450 | 30.445 |

We manufacture the prototype to measure the performance of this piezoelectric actuator, as shown in

When the prototype is placed in the deep sea high pressure simulation system, we use precision impedance analyzer to measure impedance characteristic of prototype and obtain the resonant frequency, as shown in

In this study, we design and study a deep-sea resonant sandwich linear piezoelectric actuator. We complete the mode degeneracy of fifth order bending vibration and second order longitudinal vibration. We manufacture the prototype and measure its performance. The measuring result verifies the simulation result. Finally, prototype’s velocity reaches 264.5 mm/s while the water pressure is 8 MPa and the voltage signal with frequency of 30.30 kHz and voltage amplitude of 150 V.

This project is supported by the National Natural Science Foundation of China (No. 51575124).

He, S.P., Shi, S.J. and Chen, W.S. (2018) Development of Deep-Sea Resonant Sandwich Linear Ultrasonic Motor. Journal of Applied Mathematics and Physics, 6, 296-300. https://doi.org/10.4236/jamp.2018.61028