| Pantograph-catenary system undertakes the important mission of transmitting power to Electric Locomotive.And the current-receiving quality is decided by pantograph-catenary dynamic performance of Electric Locomotive.The pantograph-catenary coupling relationship become increasingly complex especially under the disadvantage section of high wind and catenary irregularity.Furthermore,the vibration of pantograph-catenary system is fierce with the speedy improved train running velocity as well as coming into use of Electric Multiple Units(EMUs)trains.Moreover,current-receiving quality is serious deteriorated,which causes the threat of the running safety of trains.Aim at this practical problem,this thesis mainly takes the pantograph-catenary coupling part of EMUs trains as the research subject,and the unfavorable receiving condition of wind load environment and contact wire irregularity is proceeded.The purpose is to provide some reference for the improvement of current collection quality of double pantograph catenary system.The main study contents are as following:(1)The study Combines with the actual parameters of relevant operating lines to establish the simple chain catenary model which use Euler Bernoulli beam as the elementary unit.In addition,the ternary pantograph equivalent model which considers stiffness and damping effect is established.Furthermore,the study uses penalty function method to simulate dynamic coupling of double pantograph-catenary and complete the establishing of double pantograph-catenary dynamical model.At last,the validity of the model is tested by EN50318 standard.(2)The Auto Regressive(AR)method is used to simulate the impulse wind speed time interval in the consequent and vertical directions.It also establishes the random wind field of pantograph-catenary of railway side which considering horizontal and fluctuating wind.Furthermore,the model is based on the drive of aerodynamic buffeting of pantograph-catenary clue structure,in order to modify the dynamic model of the double pantograph-catenary under the wind environment.After that this section research the dynamic coupling relationship of double pantograph-catenary under wind load environment from time-domain and frequency-domain respectively,and then analyze the influence of wind speed and wind Angle of attack on the flow quality of front and rear pantograph.The result is carried out that the pantograph-catenary contact force(PCCF)is influenced by wind speed and wind angle easily.Moreover,according to the relevant analysis,some suggestions are put forward to improve the current collection quality in the wind area of EMUs trains.(3)Empirical mode decomposition(EEMD)and smooth pseudo Wigner-Ville distribution(SPWVD)theory is used to extract features of PCCF.Furthermore,wavelength characteristics of main frequency components and residual components of contact pressure are analyzed.The result shows that the size of each wavelength in the main frequency component section mainly depends on the catenary’s structural parameter of span,half-span and inter-dropper distance.It can be also concluded that the residual components affect the interaction vibration of pantograph-catenary.This part of study can provide a theoretical basis for the component’s identification of PCCF.(4)The cosine formula of contact wire irregularity is introduced to correct the dynamic model of pantograph-catenary system under irregularity condition.On the basis of components identification of PCCF,and considering the random mutation characteristic of irregularity,the theory of Choi-Williams spectral kurtosis(CW-SK)and the smooth pseudo Wigner-Ville distribution is adopted to identify and locate the contact wire irregularity components along the railway line.The simulation result shows that this method is accurate,and has no interference components.It can determine the wavelength size and spatial position of the irregularity component intuitively,and provide the basis of determining the unfavorable current location of the line of contact. |
PDF Full Text Request