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25 results on '"Davis, Christopher L"'

2. Transfer having a coupling coefficient higher than its active material

Author

Lesieutre, George A and Davis, Christopher L

Subjects
Electronics And Electrical Engineering
Abstract

A coupling coefficient is a measure of the effectiveness with which a shape-changing material (or a device employing such a material) converts the energy in an imposed signal to useful mechanical energy. Device coupling coefficients are properties of the device and, although related to the material coupling coefficients, are generally different from them. This invention describes a class of devices wherein the apparent coupling coefficient can, in principle, approach 1.0, corresponding to perfect electromechanical energy conversion. The key feature of this class of devices is the use of destabilizing mechanical pre-loads to counter inherent stiffness. The approach is illustrated for piezoelectric and thermoelectrically actuated devices. The invention provides a way to simultaneously increase both displacement and force, distinguishing it from alternatives such as motion amplification, and allows transducer designers to achieve substantial performance gains for actuator and sensor devices.

Published
2001

25. The promise of partnership investment

Author

Davis, Christopher L.

Subjects
Partnership -- Economic aspects, Investments -- Planning, Personal finance -- Management, Banking, finance and accounting industries, Business
Published
1986

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