Simulation And Optimal Design Of Bogie Separated Equipment For Straddle Type Monorail Vehicle

Straddle type monorail vehicle bogie separated equipment is critical in the repair and maintenance of monorail vehicle. A certain number of disadvantages of the first domestic separated equipment are found in several years'usage, such as the level maintenance of elevating platform is not enough under partial load, human factors engineering of the equipment is inconsiderate, etc. Optimizations are made to overcome those disadvantages and optimize proposals are verified by simulation.In this paper, separation principle and equipment structure are analyzed at first, then optimize proposals and dynamic virtual prototype of separated equipment are made.Install location of rotary hydraulic cylinder base is confirmed through the optimal design of fall out beam swing mechanism by employing ADAMS, pushing force of rotary hydraulic cylinder is decreased by 8.42%. Level error of lift platform which is depended on the reliability of level-maintained mechanism is calculated on theoretical case, the level error will no more than±0.1mm. Some of the critical parts, such as fall-out beam, platform, rack and pinion mechanism are selected to carry out finite element analysis, all of these components are with high safety factor and meet the design requirements. Meanwhile, in response to the phenomenon of lifting vehicle body artificially in operation process, screw-and-nut mechanism of body suspension system is designed and checked. The FE calculation results are consistent with theoretical calculation. In addition, the structure of fall out beam is optimized in order to attain the goal of economical and practical, the maximum deformation of the beam is decreased by more than 50% after optimization.Finally, hydraulic lift system of separated equipment is optimized under the environment of AMESim and Simulink. Fuzzy controller is designed to erect a synchro-position hydraulic servo system based on fuzzy control theory. As a result, the goal of maintaining the piston rod displacement between 1mm is achieved. The superiority of this proposal is verified after making a contrast with the previous multi- speed control system.The author carry out the optimization and dynamic simulation of bogie separated equipment by employing CAD, Dynamics of Multibody Systems, finite element CAE software and MATLAB, this way of employing multiple software to accomplish simulation and optimization fully embodies the advantages of digital design, and which give a important reference for the design of this equipment,also the ideas and methods have a referenced value for similar researches.