Measuring and testing – Dynamometers – Responsive to force
Patent
1992-10-02
1994-04-12
Chilcot, Jr., Richard E.
Measuring and testing
Dynamometers
Responsive to force
73790, G01L 500
Patent
active
053015584
ABSTRACT:
A testing apparatus determines the piezoelectric properties associated with the performance of a multilayer ceramic actuator. The actuator has a predetermined length, L.sub.1, and a predetermined cross sectional area, A. The actuator includes an axis and a plurality of piezoelectric elements with electrodes interleaved therebetween. The testing apparatus includes a pressure regulator which controllably supplies pressurized air. A pneumatic cylinder receives the pressurized air and responsively applies axial forces to the actuator. A load cell and associated circuitry measures the applied force on the actuator and responsively produces a force signal, F.sub.n. A fiber optic sensor and associated circuitry determines the axial displacement of the actuator and produces a position signal, L.sub.n, in response to the magnitude thereof. A computer receives the force signals, F.sub.n, and the position signals, L.sub.n, and responsively determines the effective modulus of the actuator, Y.sub.eff.
REFERENCES:
patent: 4671659 (1987-06-01), Rempt et al.
patent: 5195378 (1993-03-01), Ferguson
NEC Res. & Develop., vol. 32, No. 2, Apr. 1991, "Effects of One-Dimensional Compressive Stress on the Properties of Multilayer Piezoelectric Ceramic Actuator" By Masahiro Kondo and Kazumasa Ohya.
Powder Technology, 22(1979) 271-278, "A High-Pressure Triaxial Testing Cell" W.C.P.M. Meerman and A. C. Knaapen.
Channel Products, Inc., 7100 Wilson Mills Road, Chesterland, Ohio, Data Sheet No. 007-D-001 & Operating Manual For Models CADT-3300 and CADT-B-3000, Belincourt Piezo D.sub.33 Meter.
Clemens Larry C.
Dam Chuong Q.
Davis Jack R.
Kemner Carl A.
Livingston Jeffrey A.
Caterpillar Inc.
Chilcot Jr. Richard E.
Masterson David M.
Oen William L.
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