Multidisciplinary Design Optimization Of Large Mining Excavator Working Device Considering Uncertainties

Large mining excavator is the main equipment of open pit mining.With the development of excavators in the direction of high speed,heavy load,precision and complexity,people have higher and higher requirements for reliability and safety of excavators.Working device is the direct executor and main bearing mechanism of excavator operation,which involves many parts and disciplines.Its dynamic performance and reliability under complex working conditions directly affect the performance and reliability of the whole equipment.Therefore,it is very important to study the reliability of excavator working device and multidisciplinary design optimization considering reliability constraints and multidisciplinary coupling.In view of this,this paper studies the multidisciplinary design optimization of working devices under uncertainties.The main research contents are as follows:(1)Establishing optimization models for various disciplines involved in the design of working equipment for large mining excavators.The front-end working device mainly includes lifting mechanism,pushing mechanism,lifting arm and bucket.Reasonable excavation trajectory can realize high efficiency and low consumption operation of the whole device.Firstly,based on the kinematics analysis of the front-end working device,a reasonable trajectory optimization model is established;Secondly,a lightweight optimization design model with strength constraints of heavy arms is established;Then,the structural optimization design model of push gear mechanism is established.Finally,the optimization models of various disciplines are solved.(2)Multidisciplinary design optimization of working device of large mining excavator.The optimization solution of various disciplines involved in the design of working device of large mining excavator involves coupling variables.Therefore,it is necessary to coordinate all disciplines and seek the global optimal solution of working device design.This paper establishes a multidisciplinary design optimization model for large mining excavator working equipment,analyzes the multidisciplinary design optimization coordination method,and optimizes the multidisciplinary design of the working device based on Collaborative Optimization(CO)algorithm.(3)Reliability evaluation of key components of large mining excavator work equipment.The paper analyzes the uncertainties of the front-end working device of large mining excavators and evaluates the reliability of its key components.Specifically include:(1)Reliability evaluation of push gears in multiple failure modes.In this paper,the reliability evaluation model based on multiple failure modes of gears is established by using V-copula function.(2)The reliability of crane arm is evaluated based on Gauss process regression and Monte Carlo simulation.(4)Multidisciplinary design optimization of large mining excavator working device under the influence of uncertainty factors.This paper establishes a multidisciplinary design optimization model for large mining excavator working devices considering uncertain factors,and analyzes the propagation of uncertain factors in multidisciplinary work of large mining excavator working equipment,based on Collaborative Optimization(CO)method and genetic algorithm.Perform multidisciplinary optimization solutions.