A variable damping control method for a multi-stage controllable variable damping shock absorber

Abstract

The invention relates to a variable damping control method for a multistage controllable variable damping damper. The magnitude of a vibration signal is detected according to an acceleration sensor, through joint adjustment of the damping coefficient, pressure and circulation quantity of magnetorheological fluid in the damper, a multistage variable damping effect is achieved, and the control method comprises the following steps that (1) the magnitude of currents passing through coil windings on the two sides of a work piston is controlled, magnetic fields of different magnetic induction intensities are generated, and thus the damping coefficient of the magnetorheological fluid is changed; (2) pretightening force in the work piston is controlled to control the position of a rotor, thereby controlling two channels in the rotor to be correspondingly connected with a stretching valve and a compression valve with different pretightening force check valve springs; and (3) the position of a flow control disc at the lower end of the work piston is controlled, thus pretightening force controls the two channels in the rotor to be correspondingly connected with circulation holes of different hole diameters, and damping control of the damper is achieved.

Description

technical field [0001] The invention belongs to the field of dampers and intelligent materials, in particular to a magnetorheological fluid shock absorber with multi-stage adjustable rotary damping force. Background technique [0002] Mechanical vibration is ubiquitous in various power machinery and mechanical products. Vibration can cause damage to mechanical parts, affect the working effect of precision instruments, and even have adverse effects on the human body. In the fields of aviation, aerospace, machinery, construction, precision instruments, etc., vibration dampers are mainly used to eliminate the adverse effects of vibration. At present, the types of shock absorbers can be divided into passive control type, active control type and semi-active control type according to the control method. [0003] The passive shock absorber is composed of a spring and a shock absorber. Once its performance parameter stiffness and damping coefficient are determined, it cannot be cha...

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Problems solved by technology

[0005] Although magnetorheological fluid shock absorbers are widely used in the fields of automobile suspension, construction, and bridge vibration reduction due to their simple structure, low energy consumption, adjustable output damping force, and rapid response, there are still Some problems need to be solved: Most of the magnetorheological fluid shock absorbers used at this stage belong to the piston gap flow mode. This kind of magnetorheological shock absorber has a narrow adjustable range of damping force, a small magnetic field action area, and the magnetorheological fluid Disadvantages such as low utilization rate, the range of damping force that can be provided is limited; and the damping force generated by the magneto-rheological fluid shock absorber is very small at low speed, especially when the speed is close to zero, so the car works at low speed on non-paved roads Or when cornering at low speed, it cannot provide enough damping force, which affects the handling stability and smoothness of the car

In order to obtain a greater output damping force, the traditional solution is to increase the length of the damping gap, but this method will make the volume of the magneto-rheological shock absorber larger

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