A dual-tube active magnetorheological shock absorber based on variable stroke in shear mode

Abstract

The invention discloses a stroke varying type double-cylinder active magneto-rheological shock absorber based on a shearing mode. The stroke varying type double-cylinder active magneto-rheological shock absorber based on the shearing mode is composed of a bottom cover, an outer cylinder barrel, an inner cylinder barrel, an electromagnetic valve, a piston rod, a floating piston, a piston surroundedby a coil, metal rubber, a fuzzy controller, a sensor and the like, the electromagnetic piston is located in the inner cylinder barrel, the piston rod is connected with the electromagnetic piston, the inner cylinder barrel and the outer cylinder barrel are fixed on the same base, the inner cylinder barrel and the outer cylinder barrel are connected through a through hole in the side wall of the inner cylinder barrel, the electromagnetic valve is arranged on the portion, corresponding to the through hole of the side wall of the inner cylinder barrel, of the side wall of the outer cylinder barrel, the metal rubber and the floating piston structure are arranged on the inner side of the outer cylinder barrel. When the vibration absorber works, a central controller of a vibration damping system can control the current on the electromagnetic coil and opening of the electromagnetic valve so as to control the output force of the shock absorber according to an acceleration signal transmitted by an acceleration sensor installed on the shock absorber; and the central control system of the shock absorber can control the opening and closing degree of the electromagnetic valve according to thesize of the road excitation, and the buffer stroke is controlled.

Description

technical field [0001] The invention relates to the field of buffering and impact damping, in particular to a double-tube active magneto-rheological shock absorber based on a variable stroke in a shear mode, which is applied to military and civilian vehicles, aerospace, heavy machinery and weapons Such as adaptive active control buffering and vibration reduction field. Background technique [0002] Vibration and shock are widespread phenomena in nature. Vehicles, aerospace equipment, heavy machinery, weapons and other equipment, as well as bridges, buildings and other buildings, will generate severe mechanical vibration or be excited by external force loads during use. These vibrations, Load impact has a certain degree of harm to mechanical equipment or buildings. Therefore, cushioning and vibration reduction have important applications in various industries. However, most of the existing equipment uses passive damping and buffering devices, that is, ordinary oil / air buffe...

AI Technical Summary

Problems solved by technology

In the prior art, the magnetorheological shock absorber is an active intelligent shock absorber, relying on the principle that the shear force of the magnetorheological fluid changes when it is subjected to a magnetic field, by changing the magnitude of the excitation current of the damping coil, thereby Change the magnetic field near the piston, and finally achieve the effect of controllable damping force. However, most of the existing magneto-rheological shock absorbers have a single-tube structure, which makes the effective stroke of the shock absorber small, making it difficult for the vehicle to cope with complex off-road road surface, and the liquid flow of this single-tube shock absorber is insufficient when it is working, making it difficult to dissipate the temperature rise of the liquid, and the shock absorber of the prior art has a single working path, and can only rely on changing the electromagnetic coil The magnitude of the current to change the damping force

But this working mode will consume more electric energy, make the power of the shock absorber higher, and the coil will heat up more seriously.

At the same time, because the magnetorheological fluid is easy to precipitate, the internal working fluid of the existing shock absorber is actually not an ideal and homogeneous magnetorheological fluid, resulting in the premature magnetic saturation of the upper liquid, which makes the shock absorber The vibrator does not meet the design requirements, cannot reflect the technical advantages and realize the vibration reduction function

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