Vibration and noise reduction spring connected with multi-period structure in series

Abstract

The invention belongs to the field of airplane vibration and noise control and particularly relates to a vibration and noise reduction spring connected with a multi-period structure in series. The structure comprises first springs, second springs and connecting rings. Each first spring and the corresponding second spring are connected through the corresponding connecting ring to form a connectingunit. The multiple connecting units are arranged in series to form periodical arrangement. According to the spring, the characteristic that a gap exists in inherent frequency of the periodic structureis utilized for carrying out vibration and noise reduction, vibration transfer of an excitation source is effectively isolated, and the vibration performance is improved. The spring device has a bearing characteristic, and weight reduction of an airplane structure can be achieved. Due to non-existence of rubber materials, the problem of aging of the materials does not exist, the structure life isprolonged, and the maintenance cost is reduced.

Description

technical field [0001] The invention belongs to the field of aircraft vibration and noise control, and in particular relates to a vibration-reducing and noise-reducing spring with a serial multi-period structure. Background technique [0002] In the field of aircraft vibration and noise control, shock absorbers are a common vibration and noise control device. A common design of these shock absorbers is a spring-damper design. The principle of vibration reduction is that the shock absorber has a certain stiffness, which will generate a restoring force proportional to the vibration displacement when vibrating; and the shock absorber has damping, and will also generate a damping force proportional to the vibration velocity when vibrating. The damping design minimizes the vector sum of the two forces and achieves the purpose of vibration reduction. [0003] At present, the common installation forms on the aircraft, such as the installation of the engine, adopts the multi-rod c...

AI Technical Summary

Problems solved by technology

This type of shock absorber / vibration isolator has obvious vibration reduction function in a single direction, but at the joint part, the direction of vibration transmitted to this part is difficult to keep in line with the vibration reduction direction of the shock absorber / vibration isolator, so the vibration reduction effect poor

[0004] Since the current shock absorber only has the function of vibration reduction, it is difficult to bear the external force, so it is installed as an additional weight of the aircraft.

Especially in the case of strict weight requirements, the additional weight may be unacceptable, resulting in the inability to install the shock absorber, thus affecting the effect of aircraft vibration and noise reduction

[0005] Commonly used shock absorbers / vibration isolators are mostly made of rubber materials, which are greatly affected by temperature, and have aging phenomena in high temperature environments, so they must be replaced frequently, increasing maintenance costs

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