Vibration reduction test device based on magnetorheological elastomer variable-frequency damper and method thereof

Abstract

The invention discloses a vibration reduction test device based on a magnetorheological elastomer variable-frequency damper, comprising a base. Pillars are respectively arranged at the two upper endsof the base. Supports are arranged on the upper surfaces of the pillars. A support steel beam is arranged on the upper ends of the supports. Steel ropes are fixedly arranged on the sides of the support steel beam, and the tail end of each steel rope is wound on a rotating rod. The tail end of each rotating rod is connected with a transmission gear through a rotating shaft. Each transmission gear is connected with an adjustment knob through a rotating shaft. A mass block is arranged on the lower surface of the middle of the support steel beam, and an acceleration sensor is installed in the middle of the mass block. A connector is arranged in a position, corresponding to the mass block, of the middle of the base, and an exciter is installed on the top of the connector. The frequency of a collected response signal is identified by using HHT and MRDT, which is used as the basis of the rigidity control strategy of a magnetorheological elastomer variable-frequency damper. Thus, the vibrationreduction effect based on a magnetorheological elastomer variable-frequency damper can be effectively verified.

Description

technical field [0001] The invention relates to the technical field of structural engineering, in particular to a vibration reduction test device based on a magneto-rheological elastomer frequency conversion damper and a method thereof. Background technique [0002] Based on the magnetorheological elastomer frequency conversion damper, the magnetorheological elastomer is used as the main stiffness element, and the shear modulus of the magnetorheological elastomer can be intelligently controlled with the external magnetic field to realize the frequency can follow the frequency of the main structure. A new type of shock absorber that changes and changes, the control of the size of the magnetic field can be realized by changing the current of the coil in the damper. In recent years, design results based on magneto-rheological elastomer variable-frequency dampers have emerged in an endless stream, and its damping effect has been fully studied theoretically, but it must be verifi...

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Problems solved by technology

In terms of system identification of test devices, most of them currently use traditional frequency domain methods. Frequency domain methods need to obtain system excitation signals and response signals and are too dependent on the quality of the measured frequency response function. However, according to the limitations of test conditions and In the actual structure, it is often difficult to accurately measure the ideal excitation signal, and the system parameters obtained by relying on the traditional frequency domain method are often not accurate, and there are large errors compared with the real mode of the actual structure. At the same time, the system identification The efficiency is low, which brings relatively large limitations in real-time vibration control

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