船舶设备半主动单层隔振系统传递特性分析

为了提高船舶动力设备单层隔振系统的隔振性能,研究半主动磁流变(magnetorheological,简称MR)阻尼器和基础质量对系统传递特性的影响规律,采用通过试验验证的改进的Bingham模型描述MR阻尼器的力学特性,建立考虑基础质量影响的二自由度无约束隔振系统的动力学模型。通过平均法得到了隔振系统主共振时的解析解,并通过数值方法验证了理论解的正确性。以力传递率为评价指标,研究了半主动隔振系统主要参数对系统主共振的影响。结果表明:基础质量增加可降低系统的固有频率及隔振区域的减振效果;MR阻尼器控制力和零力速度的增加可提升隔振性能;MR阻尼器的阻尼增加可提高共振区域的隔振效果,但降低了隔振区域的隔振效果。

Vibration Transmission Analysis of a Semi-active One-Stage Isolation System for Marine Equipment

To improve the vibration isolation performance of the one-stage isolation system for marine equipment, the influence of the semi-active magnetorheological (MR)damper and base mass on the vibration transmission of the system is studied. An improved Bingham model verified by experiment is adopted to describe the nonlinear damping force of the MR damper, and the dynamic model of the two degree of freedom unconstrained isolation system considering the influence of the base mass is established. The analytic solution for primary resonance of the isolation system is obtained based on the averaging method which is verified by numerical method. The influence of the main system parameters on primary resonance of the isolation system is studied by taking the force transmissibility as evaluation index. The results show that the increase of base mass can reduce the natural frequency and the isolation effect at the vibration isolation zone. The performance of the isolation system can be improved by increasing the control force and zero force velocity of MR damper. The damping increase of MR damper can improve the isolation effect in the resonance region, but have opposite effect on the vibration isolation region.