《基座阻抗对浮筏系统的影响》

在浮筏系统中的基座和下层隔振器间增加阻抗变换器，以改变基座的阻抗特性，改变从激励到壳体的传递特性，使整个系统中与激励频率相近、并和舱段壳体振动相关的固有频率和激励频率错开。首先将经典的两单自由度系统的刚性基础用弹性基础取代，并在隔振系统和壳体之间插入可变阻抗的基座，通过改变基座的阻抗特性，改变传入到基座和壳体的功率流的频率特性。在此基础上，进一步针对复杂浮筏系统，研究基座阻抗的变化在各个频率段对传入基座功率流的影响，并对阻抗变换器参数进行优化。为浮筏系统中弹性基座的参数设计提供理论依据。

Influence of Base Impedance on Raft Isolation System

In order to alter the impedance feature of the base and the transmission properties from the excitation to the hull, an impedance changer represented by an M-K-C model is inserted between the lower isolator and the base of the raft system. In this paper, the influence of base impedance conversion on two single degree-of- freedom systems rested on an elastic base is studied. The result shows that the base impedance and the transmission properties from the excitation to the base have been changed, and the power transmitted into the base can be decreased at the resonant frequency of the hull. Similar conclusions can be made from the results of the raft system also. On this base, the influence of the impedance change of the base on the power transmitted to the base for complex raft system is studied. An optimization of the parameters of the impedance converser is made. This paper provides a theoretical reference for the design of the elastic base in raft vibration isolation systems.