Electro-rheological fluid damped actuator

Details Electro-rheological fluid damped actuator Electro-rheological fluid damped actuator

1992-09-23

1994-03-01

Brown, David H.

Power plants

Pressure fluid source and motor

Utilizing a mixture, suspension, semisolid or...

60368, 60911, 91361, F15B 1316, F15B 2104

Patent

active

H00012920

ABSTRACT:
An electro-rheological fluid damped actuator having an actuator housing w a moveable element such as a piston and rod assembly disposed within the housing. The actuator further comprises a hydraulic circuit with an electro-rheological fluid disposed in the hydraulic circuit. The hydraulic circuit and rheological fluid provides an active and variable damping force on the moveable element. The damping force is controlled by the output of an electrical circuit which creates an electric field within the hydraulic circuit. The electric field will cause the viscosity of the electro-rheological fluid which is exposed to the electric field to increase or decrease in accordance with the magnitude of the electric field. The increase in viscosity of the electro-rheological fluid as it flows through the actuator provides an active damping force on the actuator which allows a more precise control of the output motions of the actuator.

REFERENCES:
patent: 3521535 (1970-07-01), Oelrich
patent: 3542274 (1970-11-01), Miller
patent: 3599428 (1971-08-01), Chaney et al.
patent: 4386553 (1983-06-01), Thoman et al.
patent: 4528894 (1985-07-01), Crosby
patent: 4840112 (1989-06-01), Bhadra et al.
patent: 5042253 (1991-08-01), Kataoka

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