中间构架柔性对双层隔振系统隔振特性的影响

为定量分析中间构架柔性对内燃动力包双层隔振系统隔振特性的影响规律,指导双层隔振系统的优化设计,建立中间构架的有限元模型并进行模态计算,通过与试验模态对比,验证有限元模型的正确性。在Adams中建立考虑中间构架柔性的刚柔耦合系统动力学模型以及将中间构架视为刚体的多刚体系统动力学模型。通过自由振动和扫频分析,得到中间构架柔性对双层隔振系统隔振特性的影响规律。研究结果表明中间构架柔性会使系统固有频率及主模态方向解耦度减小,并使系统幅值响应出现移频、增频现象,其中低频段以移频为主,高频段以增频为主,中频段二者同时出现。相关结论可为隔振设计以及耦合振动的有效控制提供动力学方面的参考。

Influence of Intermediate Frame Flexibility on the VibrationIsolation Characteristics of a Double Layer Vibration Isolation System

For quantitative analysis the influence of flexible intermediate frame on the vibration isolation characteristics of double layer vibration isolation system of diesel power pack, to guide its optimization design, the finite element model of the middle frame is established and its mode is calculated. By comparing with the experimental modal, the correctness of the finite element model is verified. The coupled system dynamics model considered the flexible middle frame and multi-rigid-body system dynamics model treated the middle frame as a rigid body were established in ADAMS. Through the free vibration and the analysis of frequency sweep, obtained the influence of flexible intermediate frame on the vibration isolation characteristics of double layer vibration isolation system. The results show that flexible intermediate frame can reduce the system's natural frequency and the decoupling degree of the main modal direction, and make the amplitude response of the system produce the phenomenon of “frequency shift” and “increasing frequency”, the low frequency based on “frequency shift”, the high frequency based on “increasing frequency”, and two kinds of phenomena occur at the same time in the middle of the band. Relevant conclusions can provide a reference for vibration isolation design and effective control of coupled vibration.