关键词: 振动与波, 基础振动, 支撑组件, 四端参数法, 隔振特性, 飞机液压管路

Abstract:

For the Support component in the mechanical vibration system consist of airframe structure, support component and hydraulic line of aircraft pylon area, the dynamic stiffness and acceleration admittance are analyzed by finite element method. Based on the classical vibration isolation theory, the airframe structure is considered as an elastomer, and the quality, damping and rigidity of the support component are taken into account. A two degree of freedom physical model of pipeline support assembly with vibration of airframe structure as excitation source and hydraulic pipeline as vibration receptor is established. The displacement and force transmissibility of the support component is deduced by using the four-pole parameters analysis method, and the influencing factors of displacement transmissibility are analyzed. The results show that the stiffness parameters are main factor affecting vibration isolation performance of the support component, which not only affects the amplitude of the displacement transfer rate curve, but also leads to the peak frequency shift. While the quality parameters and the structural damping parameters of the support component have different degrees of influence on the amplitude of the curve. This will be of some reference value to the vibration reduction of aircraft hydraulic pipeline system and to improve the performance and life of the system.