Brakes – Internal-resistance motion retarder – Magnetic fluid or material
Patent
1996-04-15
1998-07-07
Graham, Matthew C.
Brakes
Internal-resistance motion retarder
Magnetic fluid or material
267136, 188162, B60G 1300, F16F 600
Patent
active
057754691
ABSTRACT:
An electrodynamic strut coupled between two points within a structure and adapted to damp the vibration of the structure. The strut includes a spring mechanism for damping low level vibration of the strut and associated structure. The spring mechanism exhibits high stiffness for damping low level vibration of the strut until the vibration reaches a predetermined value. Upon the vibration reaching the predetermined value, the spring mechanism exhibits a low constant stiffness. Also included is an motion conversion mechanism including a ball screw and associated ball nut for converting linear vibrational motion of the strut to rotational motion. A motor/generator with a pair of associated contacts is in communication with the motion conversion mechanism and adapted to combat the rotational motion with generated torque. The torque is a function of the resistivity between the contacts. Further included is a variable resistance mechanism coupled between contacts associated with the motor/generator. The variable resistance mechanism is adapted to increase the resistivity thereof at a certain level of vibration of the strut thereby working in combination with the spring mechanism of the strut in order to damp high level vibration of the strut and associated structure. A plurality of bracing mechanisms are also employed for allowing the damping of vibrational movement without the use of large capacity struts.
REFERENCES:
patent: 5348124 (1994-09-01), Harper
Graham Matthew C.
Zilka Kevin J.
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