Communications – electrical: acoustic wave systems and devices – Sonar counter-measures
Patent
1989-12-27
1991-07-16
Steinberger, Brian S.
Communications, electrical: acoustic wave systems and devices
Sonar counter-measures
367191, 310111, H04K 300, H04B 1100
Patent
active
050330284
ABSTRACT:
This disclosure describes apparatus and method for overcoming stroke limitations of moving coil reaction-mass vibration dampers, by recovering armature stroke displacement. The coil housing is selectively coupled or de-coupled to the vibrating structure. If, when the armature reaches its travel limit, sufficient damping energy has not been applied to the structure, the coil-housing assembly is decoupled from the structure while the armature is pulsed back to its zero displacement position. The housing then is re-coupled to the surface, having displaced some determinable distance from its previous location relative to the surface. Additional armature movement in the same direction as the previous armature stroke is applied, thereby generating the needed additional damping force. The resetting of the housing to its normal position vis-a-vis the vibrating structure can occur at a selected time in the damping force-generating cycle when reset does not impart an undesired reaction to the vibrating structure. In one implementation, a pair of moving-coil actuators counter-drive the vibrating structure; in another, a multiplicity of additional reaction-mass actuators are used.
REFERENCES:
patent: 4352039 (1982-09-01), Hagood et al.
Mechanical Vibration and Shock Measurements (Oct. 1980), by J. T. Boch, pp. 238-239.
AT&T Bell Laboratories
Graves Charles E.
Steinberger Brian S.
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