Magnetorheological fluid shock absorber with variable stiffness damping over a wide range of permanent magnet mechanisms

Abstract

The present invention proposes a magneto-rheological fluid shock absorber with variable stiffness and damping in a wide range using a permanent magnet mechanism, including a second cylinder, a first cylinder and a piston rod; one end of the piston rod is connected to an external load; the other end is placed in the second In the cylinder; the piston rod is fixed with the first piston with the first excitation coil and the second piston with the second excitation coil; the first piston is located in the first cylinder, and the second piston is located in the second cylinder; the Magneto-rheological fluid is stored in the cylinder cavity of the first cylinder and the second cylinder; the first cylinder is slid in the outer sleeve, and between the end of the first cylinder and the end of the outer sleeve There is a first vibration-absorbing structure with adjustable stiffness; the second piston is slid in the second cylinder to form a second vibration-absorbing structure with variable damping; the present invention controls the stiffness and damping of the vibration absorber separately through the double cylinders, so that the shock absorber can be realized The structure is integrated, and permanent magnets are used to achieve variable stiffness, which can adjust the stiffness change in a wider range, increase the maximum output force of the shock absorber and the overall dynamic adjustable coefficient.

Description

technical field [0001] The invention relates to the technical field of magnetorheological fluid equipment, in particular to a magnetorheological fluid vibration absorber with variable stiffness and damping in a wide range of a permanent magnet mechanism. Background technique [0002] Magneto-rheological fluid is a controllable fluid smart material, which can realize the millisecond-level transition from a liquid with good fluidity to a viscoelastic solid under the action of an external magnetic field, and this transition is controllable, reversible, and energy-consuming. Can be low. The magneto-rheological vibration absorber is a semi-active control device based on the magneto-rheological effect. Compared with the traditional passive control, the magneto-rheological vibration absorber has the advantage of real-time controllable damping and stiffness. Compared with the fully active control, and has the advantages of low energy consumption and simple structure, so it is widel...

AI Technical Summary

Problems solved by technology

[0005] 1) The traditional magneto-rheological fluid shock absorber can change the magnitude of the input current, and then change the magnitude of the damping, so as to achieve the purpose of vibration reduction, but it cannot change the magnitude of the stiffness, and its initial stiffness is often already replaced by the stiffness provided by the elastic element. Fixed, in order to achieve variable stiffness on the basis of variable damping, conditions are required. The general method is to connect two magneto-rheological fluid dampers in series to achieve variable stiffness on the basis of damping adjustment, but this structure The disadvantages are that on the one hand, it is bulky, and on the other hand, this vibration absorber is not an independent vibration-absorbing structure, and its control accuracy is poor, so it is difficult to realize engineering applications

[0006] 2) The current variable stiffness and variable damping design generally uses composite beams or air springs to achieve variable stiffness. For the composite beam variable stiffness method, the stiffness change response is slow and the response time is long; for the air spring variable stiffness method, its The tuning speed is slow, and it is not suitable for high-frequency vibrations, and the above two methods cannot achieve a wide range of stiffness changes

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