Multi-degree-of-freedom cantilever beam type broadband vibration absorber

Abstract

The invention relates to a multi-degree-of-freedom cantilever beam type broadband vibration absorber. The multi-degree-of-freedom cantilever beam type broadband vibration absorber comprises a mountingbase and a plurality of vibration absorption units, wherein the plurality of vibration absorption units are uniformly arranged on the outer periphery of the mounting base; and the base is connected to an absorbed vibration device, the inherent frequency of each vibration absorption unit is fi, the vibration frequency of the absorbed vibration device is f0, wherein f0-2Hz is smaller than or equalto fi, and fi is smaller than or equal to f0+2Hz. According to the multi-degree-of-freedom cantilever beam type broadband vibration absorber, the vibration absorption units with multiple frequencies are processed into an annular whole through the vibration absorber, the effective vibration absorption bandwidth is obviously improved, meanwhile, due to the fact that the mounting base is shared, theproportion of invalid quality is reduced; at the same time, the vibration absorption units are arranged in a circumferential direction, the two-dimensional vibration absorption capacity in the plane is achieved, and torsional vibration can be effectively inhibited; and the relation between the inherent frequency of the vibration absorption units and the vibration frequency of the absorbed vibration device is set, the vibration absorption bandwidth can be expanded while the vibration absorption efficiency is guaranteed, so that the requirements of more vibration absorption directions can be met.

Description

technical field [0001] The invention relates to the field of dynamic vibration absorbers, in particular to a multi-degree-of-freedom cantilever beam type broadband vibration absorber. Background technique [0002] In vibration engineering, vibration absorbers, as energy absorbing devices, are widely used in suppressing single-frequency vibrations caused by mechanical, pneumatic and other loads. [0003] Traditional vibration absorbers are mainly divided into passive, active and semi-active. Among them, the active and semi-active vibration absorbers can be tuned, so the vibration absorption bandwidth is larger, but the system is more complex, the cost is high, and the reliability is low; the passive vibration absorber has the simplest structure, good reliability, low cost, and wider application, but The vibration absorption bandwidth is narrow, generally less than 1Hz, especially the cantilever beam type vibration absorber, because of its small structural damping and narrow ...

AI Technical Summary

Problems solved by technology

Among them, the active and semi-active vibration absorbers can be tuned, so the vibration absorption bandwidth is larger, but the system is more complex, the cost is high, and the reliability is low; the passive vibration absorber has the simplest structure, good reliability, low cost, and wider application, but The vibration absorption bandwidth is narrow, generally less than 1Hz, especially the cantilever beam type vibration absorber, because of its small structural damping and narrow vibration absorption bandwidth, it can only be limitedly expanded through additional damping layers, which limits its vibration absorption performance and application range

Taking airborne equipment as an example, the frequency of its propeller varies by 5% up and down, which exceeds the working bandwidth of the vibration absorber, making it ineffective under many working conditions

The traditional cantilever beam vibration absorber is usually connected by bolts, and the constraint boundary is easy to change during the vibration process, resulting in a natural frequency shift, making the vibration absorption performance degraded or even ineffective

At the same time, traditional vibration absorbers generally only have the vibration absorption effect in one direction. If you need to increase the vibration absorption direction, you can only increase the number of vibration absorbers and change the installation direction of the vibration absorbers, resulting in a decrease in the effective mass ratio.

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