Optimization Design of Step Stress Accelerated Degradation Test for Motorized Spindle Based on Ds-Optimality

In the accelerated degradation test (ADT) of motorized spindles, it is necessary to apply a variety of stresses to simulate real working conditions. However, the traditional accelerated test scheme optimization method does not consider the weight of various stresses in the test, resulting in the evaluation accuracy of important stress parameters in the model being too low. In order to solve this problem, an optimal design method of the step stress accelerated degradation test (SSADT) scheme for motorized spindles is proposed based on Ds-optimality. Firstly, the fault tree analysis (FTA) method is used to analyze the collected fault data of motorized spindles and screen the main stress. Then, the accelerated degradation model is established by using drift Brownian motion. Based on the Ds-optimality, the optimization variables and constraints in the test are determined, and the optimization model is established with the objective of minimizing the estimated variance of the main stress parameters in the acceleration model; additionally, the optimization steps are given. Finally, an example is given to verify the effectiveness of the method. Sensitivity analysis of the optimization results shows that the method has good robustness.

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Multi-Objective Optimization Design of Constant Stress Accelerated Degradation Test Using Inverse Gaussian Process

IEEE Access ◽

10.1109/access.2019.2900397 ◽

2019 ◽

Vol 7 ◽

pp. 28757-28768 ◽

Cited By ~ 3

Author(s):

Zhenyu Wu ◽

Xiaoping Liu ◽

Bin Guo ◽

Dejun Cui ◽

Lijie Zhang

Keyword(s):

Gaussian Process ◽

Optimization Design ◽

Constant Stress ◽

Inverse Gaussian ◽

Multi Objective Optimization ◽

Multi Objective ◽

Accelerated Degradation ◽

Inverse Gaussian Process ◽

Degradation Test ◽

Accelerated Degradation Test

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Design of an Optimal Plan of Accelerated Degradation Test via Acceleration Factor Constant Principle

International Journal of Reliability Quality and Safety Engineering ◽

10.1142/s0218539318500213 ◽

2018 ◽

Vol 25 (05) ◽

pp. 1850021 ◽

Cited By ~ 1

Author(s):

Fei Teng ◽

Hao-Wei Wang ◽

Yuan Zhou

Keyword(s):

Optimal Design ◽

Design Method ◽

Asymptotic Variance ◽

Acceleration Factor ◽

Degradation Model ◽

Accelerated Degradation ◽

Optimal Design Method ◽

Degradation Test ◽

Accelerated Degradation Test ◽

Factor Constant

Accelerated degradation test (ADT) has been extensively applied to reliability assessment. To improve the efficiency–cost ratio of ADT, the optimal design method of ADT has become a research hot topic. An optimal design method based on acceleration factor, in which a Wiener degradation model and a step-stress ADT were considered, was proposed in the paper. In order to establish an accurate accelerated degradation model, acceleration factor constant principle was applied to derive the changing rules of Wiener process parameters with accelerated stress. Besides, the exact expression of acceleration factor was determined for a Wiener degradation model. The asymptotic variance of acceleration factor, which was considered as a measure of the consistency of failure mechanisms, was selected to be the objective function of optimal problem so as to ensure that the failure mechanism of products under accelerated stresses is probably consistent with that under the normal use stresses. A numerical example of designing an optimal ADT plan for a certain type electrical connector was studied, in which the effectiveness and feasibility of the proposed method were validated.

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