Reliability optimization design of AUV's all-movable rudder

A second-order response surface method based on center complex design sampling is used to obtain the ultimate state function of AUV stability. Based on the effect of uncertainty error caused by subjective and objective factors, the multiple stochastic virtual tests are carried on to get the reliability of limit state equation. The reliability sensitivity of each design variable is given with respect to the limit state function. After judging, the smaller-sensitivity variables are regarded as the certainty variables for the reliability optimization design of all-movable rudder. The result shows that the optimization iterations are reduced by decreasing the uncertainty.