Browsing by Author "Chao, PCP"

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A novel microscopic modeling on hysteresis effects on piezoelectric structures with assistance from finite element
(2006)
Chao, PCP
;
Liao, PY
;
Huang, JS
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A novel microscopic modeling technique is proposed to study the hysteresis effects on piezoeeramic materials and structures using finite element method and a modified Preisach model where polarization term is added in the constitutive relationship to describe the microscopic hysteresis effects. A simple bimorph piezoceramic beam is used as an example to illustrate the effectiveness of the present theory. The established modeling procedure is applicable to arbitrary piezoelectric structures.
Nonlinear dynamic effects of damping washers on the performance of automatic ball balancers in optical disc drives
(2006)
Chao, PCP
;
Yo, BC
;
Sung, CK
;
Chiug, CW
;
電控工程研究所
This paper is dedicated to explore the nonlinear dynamic effects of damping washers on the performance of automatic ball balancer (ABB) system installed in optical disc drives. A complete dynamic model of the ABB including nonlinearity of the damping washers is established. The method of multiple scales is applied to find all possible steady-state ball positions and stabilities. It is found that "soft" nonlinear washers have better working conditions than the "hard" ones.