Research On The Applicability Method Of Vehicle NVH

NVH is an important indicator of the development of the vehicle, the vehicle product competitiveness, if NVH indicators are all up to standard and is in the upstream level, NVH is also a company’s comprehensive research and development strength, If the NVH index is all up to standard, it means that the vehicle company’s CAE capabilities, system matching ability, test equipment capabilities are at a high level, so it is important to carry out the development and summary of vehicle NVH, which represents the ability and development direction of the vehicle R & D team, is the embodiment of the whole vehicle power plant.Based on the theory of NVH system, the development of the X project, for example, the function verification, performance evaluation and other key aspects of the whole vehicle matching, training NVH related system of vehicle matching ability, improve the comfort and market competitiveness of independent brand car, in order to cope with the increasingly severe market situation.The vibration isolation of the engine mounting system is introduced. The theory and design method of the suspension structure is described in the mode analysis and decoupling point. The experimental verification platform is designed and built. First, the CAE software analysis parts one by the modal analysis of engine mounting quality and related spare parts quality planning and avoidance; secondly, using the decoupling theory analysis and comprehensive analysis of six degrees of freedom, and strive to each degree of freedom decoupling rate in more than 85%, to ensure effective suspension scheme is; finally, the test sample were a comprehensive comparative analysis, found the problem, bench test and vehicle road test, all loaded using the vehicle road spectrum conversion, mimicking vehicle performance and 25 cases with the highest limit, and expected results are compared to the formation of testing and analysis report, identify the problems and establish system of evaluation criteria.The noise of the engine inlet and exhaust system is introduced. The DB value, the frequency range and wavelength, and the specific type of the engine noise are analyzed.Introduces the test method of NVH, and the test method of Pass-by, the test method of the noise and the noise of the tail pipe, and the relevant standards of the test.The noise of the engine inlet and exhaust system is introduced. The DB value, the frequency range and wavelength, and the specific type of the engine noise are analyzed.Also encountered in the vehicle development process of 38 order Xiao based on call, screaming exhaust, rear ear noise, repeated analysis, testing, and find out the solutions, and the scheme fully verify the implementation, the proposed synthesis theory summary, summarized the design method, for the development of other models that follow opened the new development thought, it has certain practical and reference significance.