Active-semi-active composite vibration reduction system with negative stiffness characteristic

Abstract

The invention discloses an active-semi-active composite vibration reduction system with a negative stiffness characteristic. The active-semi-active composite vibration reduction system comprises an active control actuator, a negative stiffness assembly, a magneto-rheological damping unit and a suspension sleeve. The active control actuator is realized by a cylindrical linear motor and mainly comprises a motor shaft, a rotor and a stator; the negative stiffness assembly comprises an inner annular magnet and an outer annular magnet; the magneto-rheological damping unit achieves semi-active control and comprises a damper cylinder, a piston rod, a piston and an electromagnetic coil. The damper cylinder is fixedly connected with a stator of the motor; the motor shaft serves as a piston rod of the magneto-rheological damping unit and penetrates through the cylindrical linear motor and the magneto-rheological damping unit. The inner annular magnet is fixed on the stator iron core; and the outer annular magnet is connected with the motor shaft through the suspension sleeve. The advantages of active control, semi-active control and negative stiffness characteristics are combined, the damping effect of semi-active control can be improved to the active control level, the stability is good, and the system cost is low.

Description

technical field [0001] The invention relates to the field of vibration control, in particular to an active-semi-active composite damping system with negative stiffness characteristics. This damping system has the damping effect of an active control system, but has low cost, high reliability and good stability , avoiding the system instability problem that may be caused by active control. Background technique [0002] Vibration control is an indispensable and important technology for vehicles and high-speed rail to achieve more comfortable, safer and more stable driving. Vibration control technology is mainly embodied in vehicle suspension, seat suspension and high-speed rail bogie. Currently, active control and semi-active control are two typical methods of vibration control. Active control has a good effect in vibration reduction, but the shortcomings of current pure active control systems, such as poor stability, high cost, and high power consumption, limit its widespread...

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Problems solved by technology

[0004] The technical problem solved by the present invention is to solve the following technical problems by disclosing an active-semi-active composite damping system with negative stiffness characteristics: First, the combination of the active control system and the negative stiffness component realizes the negative stiffness force to the active force compensation, thereby overcoming the shortcomings of high hardware requirements, high cost, and high energy consumption in the pure active system; secondly, the combination of the active control system and the semi-active control system overcomes the problem of poor stability of the pure active control system, and the semi-active The controllable large damping provided by the system avoids the system instability problem caused by the failure of the active system, and greatly improves the reliability and stability of the system; third, this invention can achieve the vibration reduction effect of active control, thereby overcoming the The good vibration reduction effect in the pure semi-active system is only limited to the shortcomings near the resonance frequency, which breaks through the technical bottleneck of semi-active vibration reduction; Fourth, the controllability of the semi-active control force can compensate the active force in real time, so that in Ensuring the stability of the system while further improving the vibration damping performance of the system

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