工程机械柔性机械臂振动的混合可靠性分析

摘要

Based on the probabilistic and interval hybrid model and structural reliability analysis method,vibration reliability analyses for engineering mechanical systems with multi-j oint flexible ma-nipulators was investigated.According to different types of the uncertain parameters in mechanical manipulators,the uncertainties were quantified by random and interval variables.With simulation da-ta of finite element model,a RBF agent model was built for structural natural frequencies with regard to mechanical manipulator's parameters.And the failure probability of the mechanical manipulators due to resonance was evaluated based on the probabilistic and interval hybrid reliability analysis meth-od.Finally the above analysis method was applied for a practical proj ect example to make an illustra-tion.%基于概率区间混合不确定性模型及结构可靠性分析方法,针对工程机械多关节柔性机械臂的振动可靠性进行研究.根据机械臂不确定参数的信息完备程度,通过概率变量和区间变量对不确定参数进行度量.基于柔性臂架有限元仿真数据,构建机械臂参数与结构固有频率关系的径向基函数代理模型,进而通过概率区间混合可靠性分析方法对机械臂共振的失效概率进行区间估计.最后将该方法应用于实际产品,通过工程实例验证了方法的有效性.