CHEN Hao,CAO Yun,WANG Xin-jie,et al.Failure analysis of electro-thermal micro-actuator under effect of process error[J].Optics and Precision Engineering,2021,29(06):1365-1374.
CHEN Hao,CAO Yun,WANG Xin-jie,et al.Failure analysis of electro-thermal micro-actuator under effect of process error[J].Optics and Precision Engineering,2021,29(06):1365-1374.DOI: 10.37188/OPE.20212906.1365.
Failure analysis of electro-thermal micro-actuator under effect of process error
In order to study the failure probability of a V-shaped electro-thermal micro-actuator, an uncertainty analysis of the temperature at the center of the actuator, where the highest temperature is located is performed based on its process error. The actuators that were fabricated at the same time are first measured. Then, the parameters are obtained when the width and resistivity satisfy the normal distribution. Moreover, the finite element model (FEM) of the actuator is established and validated by experiment, which ensures that the sample data used in the uncertainty analysis is accurate. According to the distribution of width and electrical resistivity and the non-intrusive polynomial chaos expansion (NIPCE), the Hermite orthogonal polynomial is chosen for the chaos expansion. Its coefficient is obtained by the Gauss numerical integration method. Finally, the chaos polynomial model of the temperature is validated by the Monte Carlo simulation. The results show that the stochastic distribution of the highest temperature on the actuator is accurate, which is obtained by using the chaos polynomial model. The main distribution and mean value of the highest temperature increases with an increase in the voltage. Similarly, the probability of temperature failure of the actuator also increases with an increase in the voltage. When an 18 V voltage is applied, the failure probability of the actuator is 91.5%.
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