Adjustable dynamic vibration absorber and adjusting method of dynamic vibration absorber

Abstract

The invention provides an adjustable dynamic vibration absorber and an adjusting method of the dynamic vibration absorber. The adjustable dynamic vibration absorber and the adjusting method can be used for adjusting the vibration absorber during vibration problem vibration isolation in the automobile NVH (Noise Vibration and Harshness) performance development process. The adjustable dynamic vibration absorber is composed of a basic vibration absorber and a mass block detachably installed on the basic vibration absorber. The specific adjusting method comprises the following steps that A, the system modality of an automobile part to be adjusted is measured under the boundary condition of a whole automobile; B, a proper mass block is selected and fixed to the basic vibration absorber, so that the vibration absorption angular frequency of the adjustable dynamic vibration absorber is equal to the modal frequency of the to-be-adjusted automobile part; C, the base and the support are used for fixing the basic vibration absorber to a to-be-adjusted automobile part, experimental optimization is conducted on the vibration absorption angular frequency and the installation position of the adjustable dynamic vibration absorber, finally, the vibration absorption angular frequency and the installation position of the adjustable dynamic vibration absorber are determined, and parameters of the final engineering vibration absorber are obtained; and D, the adjustable dynamic vibration absorber is disassembled for subsequent adjustment and use.

Description

technical field [0001] The invention belongs to the field of automobile NVH testing, and in particular relates to a vibration absorber installed on a front suspension used in the process of adjusting the road surface noise of a complete vehicle. Background technique [0002] The development of road noise, as a difficult point, has been focused on by major OEMs in the development of vehicle NVH. They did not hesitate to concentrate various resources, spend a lot of time, cost, and apply the most advanced methods, etc., but the effect is not good. The reason is not only the number of components and systems involved and the complexity of integration, but also the inability to completely avoid the frequency of its inherent structural modes. For example, the McPherson front suspension is the most commonly used suspension, because the mode of the system has a great influence on road noise, and the coupling between the components is universal, it cannot be completely solved by freq...

AI Technical Summary

Problems solved by technology

[0002] The development of road noise, as a difficult point, has been focused on by major OEMs in the development of vehicle NVH. They did not hesitate to concentrate various resources, spend a lot of time, cost, and apply the most advanced methods, etc., but the effect is not good. In addition to the many components and systems involved and the complexity of integration, the reason is also related to the fact that its inherent structural mode cannot completely avoid frequency

For example, the McPherson front suspension is the most commonly used suspension, because the mode of the system has a great influence on road noise, and the coupling between the components is universal, it cannot be completely solved by frequency avoidance, only Adopt the scheme of adding dynamic shock absorber

In the process of tuning, due to the different hard points of each model, the system mode will generally be between 150-180Hz (flexible mode). parameters, this process not only requires the supplier of the vibration absorber to actively cooperate with the debugging, but also has a long cycle, high cost, and unsatisfactory results

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