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Dynamic study of high-static-low-dynamic suspension for electromagnetic underwater acoustic transducers |
SUN Shitao, YAO Yuhui, ZHANG Xi, LI Hongguang |
State Key Lab of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China |
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Abstract To address the problem that the linear suspension cannot balance the reduction of the resonance frequency and the bearing of large hydrostatic pressure for the electromagnetic acoustic transducer, a high-static-low-dynamic suspension device was designed and its influence on the sound radiation performance of the transducer was analyzed. The system dynamics model and the differential equations of dynamic characteristics were established, and the changes of sound source level and resonance frequency of the transducer system before and after introducing nonlinear stiffness were simulated and analyzed, and the influence of input voltage on the resonance frequency of the transducer system was studied. The differences between different high-static-low-dynamic systems are investigated. The natural frequency and acceleration conductor of the suspension device before and after introducing high-static-low-dynamic stiffness were obtained by hammering test. The research results show that compared with the original linear suspension, the high-static-low-dynamic suspension has a lower intrinsic frequency and higher acceleration in the low frequency band when subjected to the same load. The introduction of a suspension device with high-static-low-dynamic stiffness characteristics into the electromagnetic transducer can obtain a lower resonance frequency than the original system, resulting in an improvement of the sound source level in the ultra-low frequency region.
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Received: 15 May 2023
Published: 15 April 2024
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