Abstract
A two-stage series-parallel vibration isolation system is already widely used in various industrial fields. However, when the researchers analyze the vibration characteristics of a mechanical system, the system is usually regarded as a single-stage one composed of two substructures. The dynamic modeling of a two-stage series-parallel vibration isolation system using frequency response function–based substructuring method has not been studied. Therefore, this article presents the source-path-receiver model and the substructure property identification model of such a system. These two models make up the transfer path model of the system. And the model is programmed by MATLAB. To verify the proposed transfer path model, a finite element model simulating a vehicle system, which is a typical two-stage series-parallel vibration isolation system, is developed. The substructure frequency response functions and system level frequency response functions can be obtained by MSC Patran/Nastran and LMS Virtual.lab based on the finite element model. Next, the system level frequency response functions are substituted into the transfer path model to predict the substructural frequency response functions and the system response of the coupled structure can then be further calculated. By comparing the predicted results and exact value, the model proves to be correct. Finally, the random noise is introduced into several relevant system level frequency response functions for error sensitivity analysis. The system level frequency response functions that are most sensitive to the random error are found. Since a two-stage series-parallel system has not been well studied, the proposed transfer path model improves the dynamic theory of the multi-stage vibration isolation system. Moreover, the validation process of the model here actually provides an example for acoustic and vibration transfer path analysis based on the proposed model. And it is worth noting that the proposed model can be widely applicable in mechanical systems.
Highlights
Nowadays, with the development of the modern industry, when all kinds of production machinery and transportation machinery are toward high speed and high efficiency, more and more emphasis is laid on the noise and vibration control of them at the same time
The model is programmed by MATLAB
Patran/Nastran and LMS Virtual.lab based on the finite element model (FEM)
Summary
With the development of the modern industry, when all kinds of production machinery and transportation machinery are toward high speed and high efficiency, more and more emphasis is laid on the noise and vibration control of them at the same time. A large amount of effort has been invested into the School of Automotive Studies, Tongji University, Shanghai, People’s. Clean Energy Automotive Engineering Center, Tongji University, Shanghai, People’s Republic of China. Corresponding author: Rong Guo, School of Automotive Studies, Tongji University, 4800 Caoan. A two-stage vibration isolation system composed of three substructures is widely used in various industrial fields. There are two kinds of two-stage isolation systems. In a two-stage series system, substructure C as the vibration source is mounted on the substructure B and through it connected to substructure A (receiver). In a two-stage series-parallel system, substructure C is connected to both substructures A and B. This article will focus on the series-parallel vibration isolation system
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