Construction of Structural Performance Degradation Model and Residual Life Analysis Based on Nonlinear Wiener Process
The Wiener process model is an important model for studying the reliability and life assessment of equipment based on degradation data.Fatigue tests are conducted on specimens of an aircraft wing skin riveted structure that are uncorroded,pre-corroded for 3 days,and pre-corroded for 8 days.The a-N data of the test specimens are obtained through fracture analysis,and the crack growth data of different specimens are acquired.Based on the crack growth process of the wing skin riveted structure,the nonlinear Wiener process is used to simulate the crack growth process and analyze the remaining life.The analysis results show that with the increase in corrosion time,the pre-corroded test specimens exhibit crevice corrosion and galvanic corrosion,which increases the damage to the test specimens and results in a successive decrease in remaining life.By using the historical degradation information of the structure to update the degradation model in real-time,and combining it with the strong tracking algorithm,the crack growth process and real-time remaining life of the uncorroded test specimens are calculated,and the maximum errors of the calculation is 8.1％and 10.3％.
Wiener processcorrosionreliability analysislife analysisdegradation
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