水下航行器全动舵可靠性优化设计

摘要

利用基于中心复合采样的二阶响应面法得到AUV稳定度极限状态函数.综合考虑由于人为和客观造成的不确定性误差对极限状态方程的可靠度的影响,进行多次随机虚拟实验,计算AUV稳定度的可靠度,并根据求得的可靠度定量给出各设计变量关于极限状态函数的可靠度灵敏度.经判断,选择灵敏度较小的参数作为确定性变量,并对AUV全动舵进行可靠性优化设计,结果表明,减少不确定性量后,优化迭代次数大幅减少.%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.