Active-passive parallel-type vibration absorber based on internal resonance mechanism

Abstract

The invention discloses an active-passive parallel-type vibration absorber based on an internal resonance mechanism. The active-passive parallel-type vibration absorber based on the internal resonancemechanism comprises a vibration absorber body, a control system and a vibration simulating plate. The vibration absorber body comprises a balancing weight, a swinging support rod, a rotation shaft, an upper frame, a lower frame, a servo motor, a flange plate, a torsional spring upper bracket, a torsional spring, and a torsional spring lower bracket. The control system comprises an acceleration sensor, a dynamic signal analyzer, an upper computer, a motion control card, and a driver. According to the active-passive parallel-type vibration absorber, through the parallel design of the torsionalspring and the servo motor, a passive control mode of the torsional spring and a semi-active control mode of the servo motor are successfully parallelly connected and combined. The whole vibration absorber has the characteristics of the semi-active control mode of low energy consumption, good stability, adjustable parameters, and non-linear large amplitude vibration, and also has the characteristics of the passive control mode of simple structure, low cost, and no a large amount of outside energy input. The response is rapid, the application range is extensive, and the vibration reducing effect is apparent.

Description

technical field [0001] The invention relates to applications in the field of mechanical vibration, in particular to an active-passive parallel vibration absorber based on an internal resonance mechanism, which is particularly suitable for vibration reduction of highly coupled nonlinear large-scale structures in space, vibration reduction of flexible mechanical arms, and the like. Background technique [0002] With the development of modern aerospace technology, the requirements for space exploration are gradually increasing, and the sailboard structure of spacecraft is developing to a large size in order to obtain tiny transmission power signals. When this large flexible complex structure in space is working in orbit, it will vibrate due to the influence of attitude adjustment, dynamic interference, space wind, etc., which will affect the accurate transmission of signals. Strong vibration will seriously affect the normal work of various payloads, leading to system performanc...

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Problems solved by technology

[0004] The components that provide stiffness and damping in the design of existing shock absorbers mainly include servo motors and torsion springs. Using servo motors alone has the advantages of convenient adjustment and simple structure, but the reliability is poor. Any problems with servo motors will be directly reflected in the On the vibration absorber, the vibration reduction effect is reduced, and even the vibration absorber cannot work, and it is difficult to meet the high reliability requirements of large-scale structures in space; using torsion springs alone has high reliability, but the structure is complicated, difficult to adjust and poor in adaptability. Once the overall structure is fixed, The stiffness and damping parameters of the shock absorber cannot be adjusted adaptively following the space environment, and cannot adapt to the complex and changeable space environment requirements

At present, there is a lack of a vibration absorber with high reliability, good adaptability, and successful use of nonlinear vibration internal resonance theory

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