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Vibration Isolation Performance of 3 DOF Quasi-zero Stiffness Floating Raft System

李盈利  XU Dao-lin  
【摘要】:The intensity and spectra feature of the noise and vibration sources on-board an underwater vehicle must be controlled in order to provide the submarine with a stealth capability to perform many of its intended missions.To enhance the stealth capability,the submarine should minimize the acoustic noise that is broadcast into the water and prevent it from being detected by active sonar methods,where a sonar signal is broadcast from another platform and listens to the reflected signals.To achieve this goal,much effort has been dedicated to the vibration isolation of the submarine.In view of the superior vibrationisolation performance of the Quasi-zero stiffness(QZS)isolators,they are employed in the two layer floating raft system in this report.Considering the actual structure elastic property,the foundation of system is modeled movable here,which appends an additional degree of freedom to the system.In order to analyze the dynamic characteristics of the 3 DOF QZS system,the average method is adopted to solve the differential equations,by which the amplitude and response of the system can be obtained.Moreover,the Runge-Kutta Algorithm is conducted with MATLAB/SIMULINK to solve the dynamic system in numerical simulation,which validates the correctness and efficiency of the theoretical solution in the approach.Considering the elasticity of the foundation,the vibration level difference index is adopted to evaluate the vibration isolation performance of the QZS system,indicating the ratio of vibration response of the isolated equipment to that of the elastic foundation.In case of the system takes on complicated motions,such as quasi-periodic or chaotic motions,the square root of the response is utilized to acquire the vibration level difference.The results demonstrates that the excellent performance for attenuating the vibration of the proposed system can be largely extended to a lower frequency domain in comparison with the corresponding linear system,proving the QZS system is an outstanding performer in low-frequency vibration isolation.The conclusions can provide some available evidences for the design and improvement of both the passive and active control of the vibration isolation systems.

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1 王强勇;姚熊亮;于丹竹;庞福振;;舰船刚性阻振质量复合托板隔振特性优化设计(英文)[J];Journal of Marine Science and Application;2011年02期
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