The Dynamic Response Analysis And Optimization Of Vibration Isolation Rate For Automobile Engine Mounting System

Engine vibration is one of the main sources of vehicle vibration. It is important to study the dynamic response analysis and optimization of Vibration isolation rate, which is the key theory method to improve vehicle's comfort and NVH (Noise, Vibration and Harshness) performance. Taking a domestic truck as the research object, the dynamic response analysis and the isolation rate optimization for vehicle engine powertrain mounting system was studiedThe main research work in this paper focuses on the following aspects:Firstly, this paper discusses the current development of the mount components for automobile engine power assembly, optimization design of suspension system both domestically and abroad, and introduces the basic theory and method of the automobile engine powertrain mounting system design. Moreover, this paper introduces the engine powertrain mounting system modal analysis and the decoupling degree calculation and improves the suspension system modal frequency and optimization design theory of decoupling degree and method. At the same time, through the ANSYS software programming secondary development, this paper realize the load) auto engine powertrain mounting system modal frequency and decoupling degree optimizationSecondly, this paper Puts forward the design theory of engine powertrain mounting system vibration strictly decoupling with the scheduled frequency, and gives the conditions of mounting system strictly decoupling. In the sequent, this paper points out the reasons of difficult to strictly decoupling for the mounting system usually, and based on the theory of strict decoupling, a new optimization method was given aimed to improve modal frequency and decoupling degree. From the strict decoupling equation, two important conclusions ware deduced. Examples verified the correctness and efficiency of the theory and method. The proposed theory provides an important thought and basis theory for optimization design of suspension system to relevant industry and has a guiding significance and practical value for mounting system optimization design.In the sequent, exciting force was given for engine mounting system, and the multibody dynamics analysis model containing power assembly-suspension element-frame of suspension system was set up by using ANSYS. Using the software ANSYS's function of loading constraints and response analysis, analysis of the dynamic response analysis was fulfilled for auto engine powertrain mounting system based on the modal.Finally, it presents the calculation of vibration isolation rate of mounting system based on the analysis of the dynamic response, and the optimization design model and solving method was suggested in order to improve the vibration isolation rate of mounting system. We discuss the factors and mechanism influencing vibration isolation rate of suspension system. Finally, by using ANSYS software and its APDL programming function, auto engine powertrain mounting system dynamic response analysis and optimization of vibration isolation rate was achieved. Results of optimization show that the optimization model and optimization method are correct and effectiveTherefore, this study comes from practice, and has good theory significance and practical application value.