准零刚度隔振耦合简支板的水下振声耦合特性研究OA

Structural vibration noise from the power compartment critically impairs the acoustic stealth performance of undersea vehicles.Utilizing vibration isolation technology to attenuate or isolate vibration transmission is an effective approach to reduce structural vibration noise.However,traditional linear vibration isolation technology struggles to achieve low-frequency vibration and noise reduction.To address this challenge,this paper applied a quasi-zero stiffness isolation method between the excitation source and the elastic structure to reduce the transmission of equipment vibration,thereby mitigating the vibration and radiated noise of underwater structures.By taking a quasi-zero stiffness isolator coupled with a simply supported plate as the research object,the vibration-acoustic coupling equations were established and solved by considering the radiation acoustic impedance matrix with mutual coupling effects.Subsequently,the accuracy of the theoretical model was validated through finite element simulations.The results indicate that compared to the linear isolation system,the quasi-zero stiffness isolation system significantly reduces the initial isolation frequency and enhances low-frequency isolation efficiency.Furthermore,the introduction of quasi-zero stiffness shifts the system's resonance frequency far below the high-radiation-efficiency volumetric control modes of the simply supported plate.This frequency domain mismatch mechanism effectively blocks the conversion of vibration energy into radiated acoustic energy at the source,reducing the radiated sound power by 15 dB across the entire frequency band above 10.6 Hz.This study resolves the issue of low-frequency vibration and noise reduction in underwater structures,providing a theoretical reference for the acoustic stealth design of power compartments in undersea vehicles.