Study On Critical Elastic Elements’ Modeling Based On High Speed Pantograph

Pantograph-catenary system(PCS)has become the main way to conduct the currency to high speed train in railway system owing to its safety,stability,reliability and wide speed application during the construction of electric railway.To better to keep the safety and quality of electric railway,the study on PCS dynamic modelling is indispensable.Pantograph,as device on the electric train to couple with catenary for collecting currency,the elastic elements for energy absorption and storage on it can not only help pantograph to absorb the shock and vibration from PCS’s dynamic coupling,but also its parameters can affect the match stare between pantograph and catenary that will decide if PCS can be safely,stably,constantly and reliably operate which is significant among electric railway lines.Besides,the research focuses on pantograph’s elastic elements’ modeling is still relatively rare leading to this study is necessary.The elastic elements of high speed pantograph which studied in this thesis are taken as the research objects,by combining theoretical deduction and multiple conditional rig experiments to develope their models.1.The study on pantograph’s spring box which has been observed a significant stiffness increase(stiffness hardening)during experiments and realistic operations.Acquiring the data from a series of experiments of spring box under different work conditions and combining Metal hardening theory,a stiffness hardening model is proposed.Then,a stiffness anticipation scheme for spring box has been given,by using fiber strain sensor to collect force data conducting on the spring box and then translate it into input which can be handled by the stiffness hardening model to anticipate the stiffness change during operation.Systematically gives the specifice procedure to apply the hardening model into practice.2.Multiple conditional tests have been made to the air spring and its affiliated pneumatic system which on pantograph’s base.Then,combine the basic thermodynamic and hydrodynamic laws and assumptions and air spring’s specific pneumatic structure to give the low order and high order thermodynamic model which are used to describe the relationship between air spring’s pressure and vibration displacement,and then compare Matlab’s simulation result and experiment data to verify the two models.Based on that,derive the basic model for depicting the relationship between air spring’s vertical force and vibration displacement,Combining the influence of air spring’s material and data to improve the basic model to get the final model.Similarly,compare Matlab’s simulation result and experiment data to verify this final model.