Structural NVH (Noise Vibration and Harshness) analysis method for vibration interference abnormal noise based on modal frequency response

Abstract

The invention relates to the field of automobile designs and in particular relates to a structural NVH (Noise Vibration and Harshness) analysis method for vibration interference abnormal noise based on modal frequency response. The method comprises the following steps: establishing a finite element model of a turning mechanism by virtue of a three-dimensional model, analyzing by adopting CAE software, combining the dynamic clearance deformation condition when two structural members are connected by virtue of a rubber bushing, thereby obtaining dynamic displacement values in three directions (X, Y, Z) of reference points of an axle tube and an axle lever; comparing the displacement values and the corresponding frequencies of the two reference points, calculating the clearance between the axle tube and the axle lever during movement, comparing the geometric layout size calculated clearance and the analyzed clearance, and further performing structural modification. According to the method disclosed by the invention, the development cycle of the product is shortened, the research and development cost is reduced, the response time is short and accurate, and motion interference abnormal noise and other engineering problems in the structural vibration are solved, so that the NVH performance of the complete vehicle is improved, and the method has important guiding significances for performing dynamic verification design on the complete vehicle and other system assemblies and on research and development of the complete vehicle.

Description

technical field [0001] The invention relates to the field of automobile design, in particular to a structural NVH analysis method based on vibration interference abnormal noise of modal frequency response. Background technique [0002] In the development process of automobile products, rubber bushing is an important part of the automobile system, which plays an important role in vibration reduction or vibration isolation. During the movement of the car, the bushing will be subjected to forces from all directions. The stiffness of the bushing has a great influence on its deformation. In order to avoid resonance with the frequency of the ground or other components, it is of great significance to analyze the dynamic deformation of the structure or system based on the dynamic stiffness of the bushing, especially the dynamic interference check in the early stage of development. [0003] In automobile development, it is difficult for some systems to meet the development requiremen...

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Problems solved by technology

[0003] In automobile development, it is difficult for some systems to meet the development requirements with simple static and dynamic analysis. For example, the cab tilting mechanism system in the field of commercial vehicles, although the strength performance can be calculated with simple static analysis, it is difficult to accurately calculate the amount of vibration movement ; and the use of dynamic simulation analysis can calculate the motion deformation of the entire system, so as to design the motion gap for the motion mode of the parts, avoid interference and produce abnormal noise, provide huge technical support for the accurate development of products, shorten the product development cycle, and reduce costs

[0004] In the NVH, strength and durability analysis of structures, its static analysis technology is quite mature, but automotive structural parts are usually subjected to dynamic impact from various systems, and the vibration modes of various parts are inconsistent, resulting in motion interference and abnormal noise, which affects the entire system. Vehicle NVH Performance

However, conventional static analysis is difficult to comprehensively test the vibration performance of the structure.

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