A reliability model for piezoelectric actuators

A probabilistic approach is presented for the evaluation of the reliability of piezoelectric micro-actuators that takes into account the effects of both driving voltage and temperature. Based on the relationships between the lifetime and degradation mechanism of piezoelectric actuators and the electric field strength, as well as the actuator working temperature, a two-dimensional probability model for evaluating reliability of piezoelectric micro-actuators is described. The concept of two-dimensional strength is proposed to incorporate the electric driving voltage and the working temperature of the piezoelectric actuators at a specified lifetime. The lifetime (number of cycles to failure) of piezoelectric actuator, electric load and temperature are considered as the random variables and their probability distributions are discussed. A two-dimensional strength probability distribution function is derived. A two-dimensional interference model between the two-dimensional strength and load is also used to derive the reliability expression. Using this approach, the relationship among the reliability, lifetime, driving voltage and temperature can be described analytically. The relationship between reliability and the lifetime of piezoelectric actuator can be obtained. A case study of a piezoelectric micro-actuator used for head positioning in a disk drive head positioning system demonstrates that the two-dimensional probability model can be used for reliability evaluation and lifetime estimation of piezoelectric micro-actuators according to design requirements

[1]  Yongxiang Zhao,et al.  An approach for determining an appropriate assumed distribution of fatigue life under limited data , 2000, Reliab. Eng. Syst. Saf..

[2]  Qinghua Li,et al.  Finite element simulation and optimization of piezoelectric suspensions , 1999, Smart Structures.

[3]  Sankaran Mahadevan,et al.  Corrosion fatigue and multiple site damage reliability analysis , 2003 .

[4]  Kaoru Matsuoka,et al.  Manufacturing process of piezoelectric thin-film dual-stage actuator and its reliability for HDD , 2002 .

[5]  Shigeo Nakamura,et al.  Lifetime prediction method for piggyback PZT actuator , 2001 .

[6]  Masahito Kobayashi,et al.  A push–pull multi-layered piggyback PZT actuator , 2002 .

[7]  Toshio Tsuchiya,et al.  Lifetime and Degradation Mechanism of Multilayer Ceramic Actuator , 1998 .

[8]  Qi Hao,et al.  A dual-stage control design for high track per inch hard disk drives , 2001 .

[9]  Thong Ngee Goh,et al.  On changing points of mean residual life and failure rate function for some generalized Weibull distributions , 2004, Reliab. Eng. Syst. Saf..

[10]  M. Budinger,et al.  Analytical modeling for the design of a piezoelectric rotating-mode motor , 2004, IEEE/ASME Transactions on Mechatronics.

[11]  Takeshi Morita,et al.  Miniature piezoelectric motors , 2003 .

[12]  Han Tong Loh,et al.  A probabilistic approach to evaluate the reliability of piezoelectric micro-actuators , 2005, IEEE Trans. Reliab..

[13]  K. Uchino.  Materials issues in design and performance of piezoelectric actuators: an overview , 1998 .

[14]  Shoko Yoshikawa,et al.  Actuator environmental stability , 2000, Smart Structures.