Variable-stiffness variable-damping shock absorber based on smart material

Abstract

The invention relates to a variable-stiffness variable-damping shock absorber based on a smart material. The variable-stiffness variable-damping shock absorber comprises a cylinder barrel 2 and a force transmission spring 12 arranged in the cylinder barrel 2. The cylinder barrel 2 is internally provided with a variable-stiffness mechanism. The force transmission spring 12 is arranged on the variable-stiffness mechanism. A main body of the variable-stiffness mechanism is formed by overlapping silicon steel sheets 14 and magneto-rheological elastomer sheets 15 mutually. The side face of the main body of the variable-stiffness mechanism is provided with a lower coil winding 3. The bottom of the cylinder barrel 2 serves as a shock absorber fixed end. The upper end of the force transmission spring 12 is connected with a piston 16. The piston 16 serves as a shock absorber moving end. A block made of a giant magnetostrictive material 7 is arranged above the force transmission spring 12. The block is matched with the lower portion of the piston 16 in shape. The side face of the block is provided with an upper coil winding 8. The periphery of the upper coil winding makes contact with the cylinder barrel 2 through a friction lining 9.

Description

technical field [0001] The invention relates to the field of intelligent material shock absorbers, in particular to a variable stiffness variable damping shock absorber. 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 aviation, aerospace, machinery, automobiles, construction, precision instruments and other fields, shock absorbers are 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 according to the control mode. control type. [0003] The passive shock absorber is composed of a spring and a damper. Once its performance parameter stiffness and damping coefficient are determined, it cannot be changed. The vibration damping performance is ...

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Problems solved by technology

[0005] Although the magnetorheological fluid material has a good magnetorheological effect, the magnetic particles in the liquid suspension medium are easy to settle, have poor stability, and the particles are easy to wear, which hinders its further application in engineering practice.

Magnetorheological elastomers are developed on the basis of magnetorheological fluids. By replacing the mother liquid of magnetorheological fluids with polymers, the shortcomings of magnetorheological fluids are overcome, but the vibration reduction based on magnetorheological elastomer materials The damper can only control the stiffness change, it is difficult to adjust the damping parameters of the shock absorber

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