Reliability analysis of NC rotary table based on a Wiener process for extremely small samples
ZHANG Yun, JIANG Nan, WANG Liping
Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipments and Control, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
Abstract：The performance of numerical control (NC) rotary tables degrades slowly and oscillatorily. A Wiener process model is developed to improve the reliability estimate of NC rotary tables using the maximum likelihood method to analyze the measured characteristics of each parameter with fixed drift and diffusion coefficients assuming that the initial performance degradation values obey a normal distribution. The model gives the correlation reliability function for the NC rotary table. Comparison of the results with those of the pseudo life distribution method shows that the Wiener process model more accurately predicts the actual characteristics.
张云, 姜楠, 王立平. 基于Wiener过程的数控转台极小子样可靠性分析[J]. 清华大学学报（自然科学版）, 2019, 59(2): 91-95.
ZHANG Yun, JIANG Nan, WANG Liping. Reliability analysis of NC rotary table based on a Wiener process for extremely small samples. Journal of Tsinghua University(Science and Technology), 2019, 59(2): 91-95.
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2019, Vol. 59 
