Method for detecting shock-absorption and noise-reduction performance of car damping material

Abstract

The invention discloses a method for detecting shock-absorption and noise-reduction performance of a car damping material. The method comprises detection on two aspects, i.e. the detection of a damping material on the aspect of the feeling of passengers for the vibration noise in the process of simulating the real driving process, and the detection of the damping material on the aspect of reducing the vibration of the overall structure of a car body and the bias of resonant frequency. By adopting a novel method for detecting the shock-absorption and noise-reduction performance of the damping material which is reasonably combined with the car body of a specific car, the shock-absorption performance index of the damping material applied to the car can be simply and intuitively expressed, the complicated modeling work can be omitted, the detection work is relatively simplified, the result is intuitive and dependable, and the application prospect is remarkable.

Description

technical field [0001] The invention belongs to the field of damping material detection, and in particular relates to a method for detecting vibration and noise reduction performance of automobile damping materials. Background technique [0002] Using damping materials to reduce vibration and noise of automobiles is already a fairly mature technology. When we study automobile vibration and noise, we usually use NVH index. NVH is the abbreviation of English words for Noise, Vibration and Harshness. Because these three usually appear at the same time and are inseparable in the field of automobile vibration, they are often combined for research. Among them, the roughness of sound and vibration is also called roughness, which is a description of the quality of vibration and noise, and is the subjective perception of the human body on noise and vibration, which cannot be directly measured by objective measurement methods. [0003] The main sources of vibration and noise during...

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Problems solved by technology

[0011] However, in practical applications, due to the complexity of the body structure and driving environment, when selecting damping products, it often occurs that even if the material performance index, that is, the structural energy damping coefficient is relatively large, the actual vibration and noise reduction effects are not satisfactory. Case

[0012] Xu Fengchen, Li Honglin, Liu Fu. Discussion on the test method of damping coefficient of damping material for automobiles[J]. Automobile Technology and Materials, 2008,08:63-67. The three test methods provided in this document are all combined materials Measure the damping coefficient of the structure, and then apply it to the overall body. There is an extra intermediate process, and the result will have certain errors.

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