| Straddle-type monorail is a typical system of urban rail transit.The operation practice of Chongqing straddle-type monorail found that due to the running mechanism of monorail vehicle bogie is different from that of metro bogie,the coupling force of pantograph and catenary is not coordinated,which leads to the problems of current collection slider seriously wear,pantograph structure damage and poor current collection quality.The Chongqing straddle monorail vehicle is considered as the research object,this paper studies the trian “vehicle-pantograph-catenary” coupling dynamics and parameter optimization of straddle monorail vehicle from the following aspects:1.The pantograph model of straddle-type monorail is established,and the validity of the model is verified.The structure and working principle of the pantograph of straddle-type monorail vehicle are analyzed.the lumped mass pantograph model,multi rigid body pantograph model,rigid flexible coupling pantograph model,fully flexible pantograph model are established and forms the pantograph model library.The modal analysis of each model and the actual pantograph modal test are carried out.Through the modal comparative analysis between the above pantograph models and the actual pantograph,it is found that each model has a certain order of natural frequency close to the actual pantograph,which verifies the adaptability of each pantograph model.2.The pantograph catenary coupling dynamic model of straddle-type monorail is established,and the validity of the model is verified.The structure of rigid catenary of straddle type monorail vehicle is studied.On the basis,the lumped mass pantograph catenary model,multi rigid body pantograph catenary model and rigid flexible coupling pantograph catenary model are established.Through the comparison of simulation and test,it is more reasonable to use rigid flexible coupling pantograph catenary model to analyze and calculate the dynamic performance of pantograph catenary system.Referring to the domestic railway industry standards TB/T 3271-2011,the evaluation method of dynamic performance of straddle-monorail pantograph catenary system is proposed.3.The “trian-pantograph-catenary” coupling dynamic model of straddle-type monorail is established.In order to study the influence of main vehicle dynamic parameters on dynamic performance of pantograph catenary system,the train coupling dynamic model of straddle-type monorail is established by using multi-body dynamics theory and line test.By integrating the rigid flexible coupling model of pantograph and catenary into train model,the “trian-pantograph-catenary” coupling dynamic model of straddle train is established.It provides reliable model support for analyzing the influence of main vehicle dynamic parameters on pantograph catenary dynamic performance.Through comparative analysis,it is found that “train-pantograph-catenary” coupling dynamic model and “car-pantograph-catenary” coupling dynamic model have little difference in the analysis of pantograph catenary coupling force.4.The influence law of main dynamic parameters of straddle-type monorail on pantograph catenary coupling force is revealed.Based on the rigid flexible coupling“car-pantograph-catenary”,the influence of air spring parameters,running wheel parameters,guide wheel parameters and pantograph parameters on the dynamic performance of pantograph catenary is studied.5.The coordinated matching scheme between vehicle parameters and pantograph catenary dynamic performance is proposed.The vehicle dynamic parameters which are sensitive to the dynamic performance of pantograph catenary are obtained through sensitivity analysis.Taking the mean value and standard deviation of contact force as the optimization objective,the lateral acceleration and vertical acceleration of vehicle body are as the optimization constraints,the vehicle dynamics parameters are optimized by using the non-dominant sequencing genetic algorithm(NSGA-II).The coordinated matching scheme between vehicle parameters and pantograph catenary system dynamic performance is formed.The relevant research and results of this paper have theoretical reference significance and engineering application value for the coupling force analysis and coordination matching of the straddle type monorail “train-pantograph-catenary” system,as well as the wear control of the monorail pantograph slider,the safety of pantograph structure and the optimization design of pantograph. |
