Brakes – Inertia of damping mass dissipates motion
Patent
1987-11-02
1989-07-18
Butler, Douglas C.
Brakes
Inertia of damping mass dissipates motion
188267, 267136, 248550, 248562, 248636, F16F 710
Patent
active
048485250
ABSTRACT:
A dual mode vibration isolator for reducing transmission of vibrations between a forward body and an aft body includes a mounting member positioned between the forward and aft bodies, a plurality of magnetic actuators each having an armature fixed to the forward body and a stator mounted on the mounting member, and a plurality of linear actuators pivotally connected between the aft body and the mounting member. The magnetic actuators support the forward body relative to the mounting member by magnetically supporting the armatures between paired stator cores in each stator. The magnetic actuators are controlled, preferably through local flux feedback loops, to permit the stators to vibrate relative to the armature without transmitting forces to the armatures, thus isolating the vibration of the aft body and mounting member from the forward body. The linear actuators extend and contract to reposition the forward body and mounting member relative to the aft body. In addition, the linear actuators provide supplemental vibration isolation through a followup isolation loop that detects variation of the armatures from a predetermined null position between the paired stator cores. The followup isolation loop moves the mounting member relative to the aft body to restore the armatures to their null positions. The assistance provided by the linear actuators enables the use of small-size magnetic actuators for a given force requirement. A method for isolating vibration from transmission between two bodies also is disclosed.
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Cunningham David C.
Davis L. Porter
Hamilton Brian J.
Jacot A. Dean
Butler Douglas C.
Hammar John C.
The Boeing Company
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