基于多自由度控制的主被动隔振器研究

An active/passive vibration isolator with multi-degree-of-freedom control

船用大型动力装置运行时所产生的线谱振动是水下辐射噪声产生的重要原因之一,通常在振源设备与船体安装基座之间采取隔振措施,抑制宽频带振动的传播。针对隔振系统振动传递路径复杂而难以有效控制的问题,在功率流传递特性分析的基础上提出一种新型主被动隔振器,在被动隔振的基础上通过主动控制进一步衰减线谱振动通过隔振器的传递。该隔振器具有多自由度振动传递控制的特点,可避免通常存在的振动传递路径切断不彻底的弊端。该研究对隔振器的静态特性、动态特性以及主被动隔振效果进行了分析和测试,仿真及试验结果均表明,通过结合加权误差反馈自适应控制算法和多自由度同步控制,主被动隔振可显著抑制弹性基础在300 Hz内的线谱振动。

The line-spectrum vibration generated by heavy marine power units is one of the important sources of underwater noise.In real applications,vibration isolation pads are usually inserted between the vibration source and the flexible base to suppress the propagation of broadband vibration.In order to effectively control the complicated vibration transmission paths in a vibration isolation system,a new type of active/passive vibration isolator was proposed.The active control was able to attenuate low-frequency vibration transmission on the basis of the passive vibration isolation.The active/passive vibration isolator can suppress vibration transmission in multi-degrees of freedom and resultingly eliminate incomplete cutting of vibration transmission paths.The static and dynamic characteristics of the passive vibration isolator were analyzed and tested.The effectiveness of active control was experimentally tested.Simulation and experimental results show that the active/passive vibration isolator can significantly suppress the harmonic vibration of the flexible foundation by combining the weighted error feedback adaptive control algorithm and the multi-degree-of-freedom synchronous control.