System Reliability Analysis Method Based On Kriging Model And Its Application In RV Reducer

With the rapid development of industrial systems,mechanical systems are becoming more and more intelligent and refined,and their reliability and safety issues have attracted great attention.However,mechanical systems usually show the coexistence of multiple failure modes and their performance functions are strongly nonlinear,implicit and time-consuming calculation,etc.The efficiency and accuracy of the existing system reliability analysis methods in dealing with such problems need to be improved.As the core device of industrial robots,the insufficient transmission accuracy of RV reducer will definitely affect the normal operation of industrial robots.Therefore,in order to efficiently and accurately evaluate the reliability of complex mechanical systems with strong nonlinearities and implicit performance functions(e.g.RV reducers),an in-depth study of system reliability analysis methods is conducted.The main research work is as follows:(1)A system reliability analysis method based on the Kriging model is proposed.The Kriging model is used as a surrogate model for implicit time-consuming performance functions,and an error estimation model for the Kriging prediction of system failure probability in series and parallel connection is derived.An adaptive update strategy for the Kriging model based on the error estimation model and significant sampling is proposed,and then a multiple modes system reliability assessment method based on the Kriging model is constructed.The results show that the proposed method can obtain the calculation results to meet the accuracy requirements with fewer calls to the real function,and can effectively improve the efficiency of system reliability evaluation.(2)The three-dimensional model of a certain type of RV reducer is established according to the structural composition and transmission principle,and the reasonably simplified three-dimensional model of RV reducer is imported into the working environment of ADAMS to establish a virtual prototype model of RV reducer.The motion simulation of the virtual prototype model is carried out to obtain the relevant dynamic response of RV reducer,and the accuracy of the established virtual prototype model and the correctness of the motion relationship are verified by comparing with the theoretical calculated values.By comparing with the theoretical calculation values,the accuracy of the virtual prototype model and the correctness of the kinematic relationship are verified,and can simulate the motion accuracy of RV reducer.(3)Combined with the established virtual prototype model of RV reducer,the simulation virtual test scheme is proposed to effectively measure the transmission error and geometric backlash of RV reducer,and analyze the degree of influence of a single factor on the transmission error and geometric backlash of RV reducer.The random variables and statistical distribution characteristics are determined,and the transmission accuracy reliability model of RV reducer is constructed.Finally,the proposed system reliability analysis method is used to carry out the transmission accuracy reliability assessment of RV reducer with transmission error and geometric backlash as the failure modes.