Method and device for active constrained layer damping for vibra

Details Method and device for active constrained layer damping for vibra Method and device for active constrained layer damping for vibra

1993-10-15

1996-01-16

Dang, Khanh

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

181208, H01L 4108

Patent

active

054850533

ABSTRACT:
A new method and device for actively-controlled constrained layer (ACLD) treatment which can be used as an effective means for damping out vibrations and sounds from flexible structures are described. The ACLD treatment consists of a visco-elastic damping layer which is sandwiched between two piezo-electric layers. The three-layer composite ACLD, when bonded to a surface which is subject to vibrational and/or sound disturbances, acts as a smart constraining layer damping treatment with built-in sensing and actuation capabilities. The sensing capability is provided by the piezo-electric layer bonded to the surface of the flexible structure, whereas the actuation or control capability is generated by the other piezo-electric layer which acts as an active constraining layer.

REFERENCES:
patent: 4626730 (1986-12-01), Hubbard, Jr.
Baz et al.; Performance of an active control system with Piezoelectric Actuators; vol. 126, No. 2; 1988; pp. 327-343.
Baz et al; Optimum Vibration Control of Flexible Beams By Piezo-Electric Actuators; Proceedings of the Sixth VPI&SU/AIAA Symposium Held in Blacksbury, Va.; Jun. 29-Jul. 1, 1987; pp. 217-234.
Cremer et al; Structure-Borne Sound Structural Vibrations and Sound Radiation at Audio Frequencies; Springer-Verlag Berlin Heidelberg New York; 1973 and 1988; pp. 242-265.
Nashif et al; Vibration Damping; A Wiley-Interscience Publication-John Wiley & Sons; 1985; pp. 258-323.
Asnani et al; Virbation Damping Characteristics of Multilayered Beams With Constrained Viscoelastic Layers; Journal of Engineering for Industry; Aug. 1976; pp. 895-901.

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