Vibration Analysis And Optimal Design Of Vehicle Power-train Mounting System

The vibration of Power-train as the main excitation source of the car has a greatinfluence on automobile ride comfort. Proper design of Power-train mounting systemcan improve the riding comfort by remarkably suppressing the vibration，as well asextend the age of the engine and other components.The dynamic equation of Power-train mounting system is derived by applyingLagrange Equati on and vibration theory. The guide module in Matlab developedprocedure of Power-train mounting system natural frequency and decoupling ratecalculation based on the measurement of the geometric parameters and qualityparameters of the actual model. The program can be fast, accurate and convenientcalculation of the natural frequency of the mounting system and the decoupling rate.Using Adams establish six degrees of freedom model of the Power-trainmounting system. This can be a more intuitive understanding of the vibration isolationperformance of the mounting system, verify that the reasonable of mounting systemfrequency distribution and modal decoupling. The Power-train mounting system wassimulated in idling condition, the condition of rated speed; maximum torqueconditions to analysis the vibration isolation characteristics of the mounting system.In order to get the better vibration isolating characteristic of mounting system,against the inadequacies of the natural frequency of the mounting systemconfiguration and decoupling rate, combined with engineering practice, three spindlestiffness of the mounting components as optimization variables. Using the energymethod mounting system optimized to achieve the system decoupled mountingsystem and rational allocation of natural frequency on the main direction of theexciting force. The comparative analysis of the vibration optimized front and rearmounting system, the results show that the optimized mounting system to achieverational allocation of natural frequency and system decoupling, achievingoptimization goals.This paper also discusses the fracture failure of rubber mounting components. Onthe basis of a detailed study of the mechanical properties of the rubber material,determine the force in the cycle of the engine mount, to establish the finite elementmodel of the rubber mount; by finite element structural analysis, find out the areas ofstress concentration, the stress cloud of rubber mount may determine the initial failurestarting position. The results of this study show that the vibration isolation effect of optimizedmounting system significantly improved the research methods and results using in thisarticle of the design of mounting system has certain reference significance.