Reliability Analysisfor Anti-oil Hammer of Hydraulic Pipe Based on Kriging Model
The oil hammer can easily lead to the adverse effects such as pipeline damage and leakage.The current analysis for the hydraulic pipe is based on its deterministic parameters,whereas the parameters generally exhibit random uncertainties in actual working conditions due to the manufacturing errors,material dispersion,and environmental changes.To address this issue,a reliability model with anti-oil hammer is developed for the pipe in considering the parameter uncertainties.Based on the four-equation model with fluid-structure interaction,the method of characteristics(MOC)is used for the dynamic characteristic analysis on the pipe subjected to oil hammer.Then a limit state function with anti-oil hammer for the pipe is established based on the criterion whether the oil hammer-induced peak pressure exceedes the yield strength or not.As the limit state function is implicit,a reliability analysis method with anti-oil hammer for the hydraulic pipe is established based on an adaptive Kriging model.Subsequently,the failure probability of the hydraulic pipe under oil hammer is calculated.The results indicate that the reliability analysis method based on the adaptive Kriging model can significantly improve the computational efficiency while meeting the accuracy requirements.
hydraulic pipeoil hammerreliabilitymethod of characteristicKriging model
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