| This research work is a combination of a car's vibration and noise reduction projects. Thesis relate to the content of the the test and evaluation of vehicle powertrain vibration isolation performance, the test of dynamic characteristics of hydraulic mount components, vibration isolation theory, fluid dynamics, fluid structure interaction, nonlinear and so on. First the theory of single degree of freedom vibration isolation system and the relationship between transmissibility and damping ratio , frequency ratio are introduced. Elements of the ideal powertrain mounting stiffness, damping characteristics of the request is Proposed. And for the high level of interior noise and vibration problems of the car , the powertrain vibration isolation performance tests is made, the change of isolation rate with the engine speed is analyzed. Also on the hydraulic mount components of the dynamic test, the dynamic stiffness and damping characteristics are obtained, compared with other similar components, the study found that the amplitude change characteristics of suspension components are special. In order to analyze the dynamic performance of hydraulic suspension components parameters, according to its structure, operating principles and a simplified mathematical model, simulation model of the hydraulic suspension components is built by AMESim software. Model parameters provided by the manufacturer will be entered into the simulation model, the simulation parameter settings, simulated the dynamic characteristics of suspension components test conditions to verify the correctness and accuracy of the simulation model.In the research model parameters on the dynamic characteristics of hydraulic mount components, the suspension components on its properties and increase the frequency dependent property change affects two aspects of the analysis. Excitation amplitude is set to 0.5mm, the frequency of excitation from 1Hz to 101Hz, suspension components that may affect the performance of the main model parameters are took on different values to different simulation analysis of the frequency-dependent characteristic curve analysis and comparison of the curve, draw relevant conclusions for Mounting Components designers. Excitation amplitude is set to 0.25mm, 0.5mm and 1mm, suspension components that may affect the performance of the main model parameters were simulated for various values of its amplitude changes are characteristic curve analysis and comparison of the curve, draw relevant conclusions for Mounting Components designers.Defined the various parameters on the frequency-dependent characteristics and the amplitude characteristics of hydraulic mount components, according to staff of the mounting system mount points matching element stiffness and damping characteristics of suspension requests, staff can design and manufacture of suspension components quickly adjustment of relevant parameters are more in line with the needs of suspension components to improve the dynamic mounting system to improve vehicle NVH performance. |
PDF Full Text Request