针对航空装备在寿命周期内不只经历一个任务阶段,而当前加速寿命试验(accelerated life test,ALT)优化设计大多仅关注单一任务阶段的情况,提出一种综合环境下两阶段ALT优化设计方法。该方法采用拉丁超立方设计(Latin hypercube design,L...针对航空装备在寿命周期内不只经历一个任务阶段,而当前加速寿命试验(accelerated life test,ALT)优化设计大多仅关注单一任务阶段的情况,提出一种综合环境下两阶段ALT优化设计方法。该方法采用拉丁超立方设计(Latin hypercube design,LHD)确定两阶段试验整体的应力水平组合方式,解决前后阶段应力水平的组合问题;以两阶段试验中产品正常应力水平下P阶分位寿命估计的渐近方差之和最小为优化目标,构建优化设计的数学模型,解决前后阶段的样本分配问题。算例分析表明两阶段ALT优化设计方法的预测精度优于传统方法,参数敏感性分析表明该方法确定的最优试验方案具有一定的稳健性。该方法为实际工程中多任务阶段产品的ALT优化设计提供了一种新思路。展开更多
This paper presents an actuator used for the trajectory correction fuze,which is subject to high impact loadings during launch.A simulation method is carried out to obtain the peak-peak stress value of each component,...This paper presents an actuator used for the trajectory correction fuze,which is subject to high impact loadings during launch.A simulation method is carried out to obtain the peak-peak stress value of each component,from which the ball bearings are possible failures according to the results.Subsequently,three schemes against impact loadings,full-element deep groove ball bearing and integrated raceway,needle roller thrust bearing assembly,and gaskets are utilized for redesigning the actuator to effectively reduce the bearings’stress.However,multi-objectives optimization still needs to be conducted for the gaskets to decrease the stress value further to the yield stress.Four gasket’s structure parameters and three bearings’peak-peak stress are served as the four optimization variables and three objectives,respectively.Optimized Latin hypercube design is used for generating sample points,and Kriging model selected according to estimation result can establish the relationship between the variables and objectives,representing the simulation which is time-consuming.Accordingly,two optimization algorithms work out the Pareto solutions,from which the best solutions are selected,and verified by the simulation to determine the gaskets optimized structure parameters.It can be concluded that the simulation and optimization method based on these components is effective and efficient.展开更多
文摘针对航空装备在寿命周期内不只经历一个任务阶段,而当前加速寿命试验(accelerated life test,ALT)优化设计大多仅关注单一任务阶段的情况,提出一种综合环境下两阶段ALT优化设计方法。该方法采用拉丁超立方设计(Latin hypercube design,LHD)确定两阶段试验整体的应力水平组合方式,解决前后阶段应力水平的组合问题;以两阶段试验中产品正常应力水平下P阶分位寿命估计的渐近方差之和最小为优化目标,构建优化设计的数学模型,解决前后阶段的样本分配问题。算例分析表明两阶段ALT优化设计方法的预测精度优于传统方法,参数敏感性分析表明该方法确定的最优试验方案具有一定的稳健性。该方法为实际工程中多任务阶段产品的ALT优化设计提供了一种新思路。
基金The authors would like to acknowledge National Defense Pre-Research Foundation of China(Grant No.41419030102)to provide fund for conducting experiments.
文摘This paper presents an actuator used for the trajectory correction fuze,which is subject to high impact loadings during launch.A simulation method is carried out to obtain the peak-peak stress value of each component,from which the ball bearings are possible failures according to the results.Subsequently,three schemes against impact loadings,full-element deep groove ball bearing and integrated raceway,needle roller thrust bearing assembly,and gaskets are utilized for redesigning the actuator to effectively reduce the bearings’stress.However,multi-objectives optimization still needs to be conducted for the gaskets to decrease the stress value further to the yield stress.Four gasket’s structure parameters and three bearings’peak-peak stress are served as the four optimization variables and three objectives,respectively.Optimized Latin hypercube design is used for generating sample points,and Kriging model selected according to estimation result can establish the relationship between the variables and objectives,representing the simulation which is time-consuming.Accordingly,two optimization algorithms work out the Pareto solutions,from which the best solutions are selected,and verified by the simulation to determine the gaskets optimized structure parameters.It can be concluded that the simulation and optimization method based on these components is effective and efficient.
