Adjustable-inherent-frequency composite power vibration absorber and control method of adjustable-inherent-frequency composite power vibration absorber

Abstract

The invention provides an adjustable-inherent-frequency composite power vibration absorber and a control method of the adjustable-inherent-frequency composite power vibration absorber. The adjustable-inherent-frequency composite power vibration absorber comprises a signal collecting unit, a control unit and an executing unit, wherein the executing unit consists of two parts including a rigidity adjustment unit and a mass adjustment unit, the rigidity adjustment unit comprises a U-shaped base frame, excitation coils and a pre-tightening screw bolt are attached to the U-shaped base frame, a vibration absorption block is positioned between two magneto-rheological elastic bodies and is fixedly arranged between two clamp plates through the pre-tightening effect of the pre-tightening screw bolt, and a liquid storage box, a liquid pump and a liquid lower cavity are connected through a hose. The adjustable-inherent-frequency composite power vibration absorber and the control method have the advantages that the design structure is simple, the vibration absorption effect is good, an effective vibration reduction frequency band is wide, the performance is stable, the control response time is short, and practical values are very high; on the basis of the existing self-adaptation type vibration absorber, the effective vibration reduction frequency band is further widened, and the problem of too short effective vibration reduction frequency band of a traditional power vibration absorber is solved; the defect that an active type power vibration absorber excessively depends on external energy is overcome.

Description

technical field [0001] The invention belongs to the field of vibration control, in particular to a composite dynamic vibration absorber with adjustable natural frequency and a control method thereof. Background technique [0002] Due to the advantages of simple structure, good economy and stable performance, dynamic vibration absorbers have been widely used in vibration control fields such as mechanical systems, engineering structures, bridges and buildings. The working principle of dynamic vibration absorber is as follows: figure 1 As shown, the mass and stiffness of the composite dynamic vibration absorber are respectively m `1 、k 1 , the mass and stiffness of the shock absorber are respectively m 2 、k 2 , the displacement of the composite dynamic vibration absorber under the simple harmonic excitation force f sin(ωt) is x 1 , the vibration absorber displacement is x 2 , it can be seen from the theory of vibration mechanics that its motion equation is as formula 1: ...

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Problems solved by technology

[0008] In view of the above defects or deficiencies, the purpose of the present invention is to provide a compound dynamic vibration absorber with adjustable natural frequency and its control method, which can solve the problem that the effective vibration reduction frequency band of traditional dynamic vibration absorbers is too narrow

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