Magnetorheological elastomer composite vibration absorber device with double-vibrator structure

Abstract

The invention belongs to the technical field of vibration and noise reduction, and discloses a magnetorheological elastomer composite vibration absorber device with a double-vibrator structure. The structure comprises a rotary body frame and two vibrators, wherein the rotary body frame is fixedly arranged below an underframe base at the bottom of a railway vehicle in a suspended mode, and the two vibrators are arranged in the rotary body frame in a suspended mode through bearing springs and are different in mass. One vibrator is also connected with the rotary body frame through symmetrically arranged diagonal springs; the centers of the vibrator and the rotary body frame are connected in series through two magnetic conductive rods; the two magnetic conductive rods are connected through a compression spring; the axial centers of the connected magnetic conductive rods coincide with the rotary body frame; each magnetic conducting rod is connected with the rotary body frame through a magnetorheological elastomer; the two magnetic conducting rods and the rotary body frame are magnetizers; one or more winding grooves are formed in the positions, corresponding to the vibrators, of the surface of the rotary body frame; and excitation coils are arranged in the winding grooves, so that a composite vibration absorber with two fixed frequencies is formed, and the vibration reduction frequency band of the composite vibration absorber is widened.

Description

technical field [0001] The invention relates to the technical field of rail transit vibration reduction and noise reduction, in particular to a magnetorheological elastomer composite shock absorber device with a double vibrator structure. Background technique [0002] During the driving process of urban rail transit vehicles, due to the excitation effect caused by the uneven track system, the wheel-rail vibration is intensified, which leads to the generation of low-frequency vibration. The transmission path is transmitted from the primary suspension to the bogie, and then through the secondary suspension. The suspension is transmitted to the trailer body. On the other hand, part of the energy cannot be absorbed due to the vibration, and is directly transmitted to the cabin, which reduces the stability and comfort of the vehicle during driving. Due to the advantages of simple structure and good vibration reduction effect, dynamic vibration absorber has become one of the effec...

AI Technical Summary

Problems solved by technology

[0004] The traditional dynamic vibration absorber, that is, the passive dynamic vibration absorber has a simple structure and good reliability, but the vibration absorption frequency is single, which cannot effectively solve the problem of vertical vibration of the rail vehicle body, because when the rail vehicle is running, the vertical vibration of the car body is Multi-frequency vibration is divided into rigid vibration frequency band and elastic vibration frequency band

[0005] The invention patent with the patent application number 201711133363.2 discloses a magnetorheological elastomer semi-active dynamic vibration absorber and its selection and installation method, which can adjust the stiffness of the magnetorheological elastomer by changing the current intensity passing through the excitation coil , so that the natural frequency of the vibration absorber is tuned to the vibration frequency of the rail vehicle body at all times, ensuring that the vibration energy of the car body at each frequency can be absorbed by the multi-layer slotted vibrator of the vibration absorber, suppressing the vertical vibration of the car body, and realizing The broadband vibration reduction of the car body, but it is a single-degree-of-freedom vibration absorber like the transmission power vibration absorber, and there is only one vibrator, while the vertical vibration of the rail car body is a multi-frequency vibration, which is divided into rigid vibration frequency and elastic vibration. Vibration frequency range, coupled with the limited stiffness of magnetorheological elastomers, it can only design operating frequencies for rigid or elastic vibration frequency ranges, and cannot completely cover all vertical vibration frequency ranges of the car body, and the vibration reduction effect is not good

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