Study On The Influence Of Vertical Vibration Of Train On Passenger Comfort

China has the most advanced railway train manufacturing technology in the world,it has become the most important passenger and freight vehicles,and occupy a large proportion in economic development.At present,the railway train has become the main long-distance travel tool for our residents,but with the improvement of living standards of residents,people’s requires for trains are no longer rest on the convenient and fast,more emphasis on ride comfort.Therefore,it is necessary to explore the ride comfort of railway train.In our country,the evaluation index of ride comfort is mainly the stability of train operation,and the main factors that affects the stability of train operation is train vibration,so this article takes the train body and the human body as the research object,analysis the influence of the train body and the human body vibration on railway passenger comfort under the track irregularity excitation by the system of vertical vibration of train.This article is divided into the following five parts:The first part mainly describes the background and significance of the topic,the concept of comfort,the impact of vibration on the human body,the research status at home and abroad,and the research methods and content of comfort.The second part mainly describes the present situation,the research method and the basic theory of the collision vibration system with nonlinear properties.The third part is mainly take the train body as an example,establish a dynamic model of vertical vibration system with three degrees of freedom,use Newton’s second law,the method of modal analysis,the method of undetermined coefficient reduct the system of expression of periodic motion,existence conditions,Poincaré mapping and Jacobi matrix at stable fixed point,finally,obtain the system in the selected range of bifurcation diagram,eigenvalue distribution map and Poincaré map by the Matlab simulation,analysis the dynamic behavior of the system under different control parameters,and reveals the process that the system changes from stable motion to unstable chaotic motion.Simultaneously,with the change of excitation frequency,analysis the influence of the train body vibration on railway passenger comfort.The fourth part is mainly take the human body as an example,establish a dynamic model of vertical vibration system with four degrees of freedom,through numerical calculation and Matlab obtain the bifurcation characteristics,eigenvalue distribution map and Poincar projection section of the train body under different control parameters,with the change of excitation frequency,analysis the influence of the human body vibration on railway passenger comfort.