Dynamics Simulation Analysis And Optimization Design Of Car Powerplant Mounting System

NVH performance today as an important indicator of the regulations and competition, has become the focus of the manufacturers study. Vehicle assembly plant for the past performance of vibration and noise control key parts and components and the engine powerplant, as development functions of the change, and now the emphasis on the overall match between the assembly.This paper states "863" research and development plan, a company car-export items - "powerplant mounting system optimized matching" as the background, the performance of vibration isolation mounting system for research. Papers to mechanical vibration isolation principles of theoretical foundation, the sedan powerplant mounting system for the study of the powerplant mounting system of the inherent characteristics of the vibration transmissibility, vibration decoupling simulation study based on standard models optimized design. Papers not only the development of new products for enterprises providing technical basis, in the course of the studies used by the virtual prototype simulation based on analytical methods and models based on the standard design optimization means for enterprises to improve the modern product development process provided a technical basis.Domestic car to a paper-based model through dynamic simulation software ADAMS base for the establishment of a powerljant mounting system grounding model and powerlannt mounting system including the vehicle model and the model under two circumstances Simulation of a modal analysis. At the same time basis in the establishment of models, the project also carried out to the calibration models modal test, and based on standard models of basic models to optimize the design so that the base model powerplant mounting system to the isolation of the intended target.In this paper main jobs are as follows:1. Past several decades, scholars at home and abroad of engine powerplant mounting system for a lot of research work and made many successful experiences. In this paper, read through a large amount of literature has mastered mounting system design theories and methods, a comprehensive summation of the previous powerplant mounting system of the research methods and results of research;2. On the powerplant mounting system vibration theory, including engine powerplant mounting system function of the vibration source and powerplant vibration mode, and the establishment of the mathematical model, and gives the natural frequency of vibration transmissibility , vibration decoupling of theoretical calculation formula for modeling, simulation and optimization of the design and provide a theoretical basis;3. Through MSC.ADAMS / View-based vehicle powerplant mounting system six degrees of freedom model, and use of ADAMS / View and ADAMS / Vibration module simulation of the model, the calculated modal natural frequency bands, the bands modal coupling;4. Powerplant mounting system model on the basis of the MSC.ADAMS / View established a vehicle model, the model created in the vehicle powerplant mounting system. Research on vehicle powerplant circumstances modal characteristics;5. System is a 6-DOF decoupling (or partial decoupling) , the natural frequency allocation, the smallest rate of transmission system optimization objective function as a mathematical expression. And the natural frequency matched to a reasonable objective function to optimize analysis, results showed that the natural frequency of a more rational, level-order mode decoupling better ;6. View of the samples vehicle powerplant mounting system in the vehicle on modal testing, and the test data ;7. Against established by the powerplant mounting system optimization model and the standard sample with the standard vehicle for analysis. Whether from the natural frequency of the overall distribution or from the band mode shape analysis, optimization and the results of tests on samples to the same basic values, and achieved the desired results .Through ADAMS / View the establishment of a multi-body dynamics model, simulation calculation and experimental modal analysis of the standard of combining the powerplant mounting system matching, greatly simplifying the workflow, speeding up the progress of the development, shorten the powerplant mounting matching cycle. From this situation, the engine through this process to match powerplant mounting system designed to meet the design requirements and achieved good results.