Apparatus and method for affecting physical parameter...

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

Reexamination Certificate

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Reexamination Certificate

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07902719

ABSTRACT:
An apparatus for affecting at least one physical parameter associated with a shaft oriented about a longitudinal axis includes: a piezoelectric tubular member in a substantially osculatory coaxial relation with at least a portion of the shaft; and at least one electrical network coupled with the piezoelectric tubular member for switchingly completing an electrical path through the piezoelectric tubular member.

REFERENCES:
patent: 7170214 (2007-01-01), Henderson et al.
patent: 7339306 (2008-03-01), Henderson
Timoshenko, S.; Vibration Problems in Engineering; D. Van Nostrand Company, Inc., New York, New York; 1928; pp. 331-336; pp. 342-343; pp. 368-370.
Crawley, Edward F. and de Luis, Javier; Use of Piezoelectric Actuators as Elements of intelligent Structures; AIAA Journal, vol. 25, No. 10; May 1986; pp. 1373-1358.
Nonami, Kenzou; DiRusso, Eliseo and Fleming, David P.; Active Vibration Control for Flexible Rotor by Optimal Direct-Output Feedback Control; NASA Technical Memorandum Prepared for the 12th Biennial Conference on Mechanical Vibration and Noise; American Society of Mechanical Engineers; Montreal, Canada; Sep. 17-20, 1989.
Okada, Yohji and Saitoh, Takashi; Vibration Control of Flexible Rotor Supported by Inclination Control Magnetic Bearings; Proceedings of the 1999 IEEE / ASME International Conference on Advanced Intelligent Mechatronics; Atlanta, GA; Sep. 19-23, 1999.
Davis. Christopher L. and Lesieutre, George A.; An Actively Tuned Solid-State Vibration Absorber Using Capacitive Shunting of Piezoelectric Stiffness; Journal of Sound and Vibration, 2000; pp. 601-617.
Cunefare, Kenneth; State-Switched Absorber for Vibration Control of Point-Excited Beams; Journal of Intelligent Material Systems and Structures, vol. 13; Feb.-Mar. 2002; pp. 97-105.

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