The consistency of the dynamic behavior of the mechanical equivalent model of high-speed pantographs with that of actual high-speed pantographs under service conditions is crucial for the correctness and accuracy of t...The consistency of the dynamic behavior of the mechanical equivalent model of high-speed pantographs with that of actual high-speed pantographs under service conditions is crucial for the correctness and accuracy of the numerical simulation results of the pantograph-catenary interaction.Firstly,based on experimental data and the finite element method,models of a mass-point frame and reduced pan head were established,which can simulate the rolling and pitching motion characteristics of the dual-strip pan head.The correctness of the finite element numerical simulation of the pantograph-catenary system based on the model was verified through an industry standard and line tests.Then,the variation law of the standard deviation of the contact force(SDCF)in the speed range of 240-450 km/h was studied,and the mechanism of large fluctuation in SDCF was explained from the perspective of pantograph-catenary resonance.Finally,the influence of pan head degree of freedom and low-pass filtering frequency of the contact force time-domain signal on SDCF was studied,and the applicable speed level of the traditional three-mass model and 20 Hz filtering were provided.展开更多
The pantograph-catenary arc has persistently posed a challenge,impeding the advancement of high-speed rail systems.As the velocity of high-speed trains continues to escalate and environmental conditions become increas...The pantograph-catenary arc has persistently posed a challenge,impeding the advancement of high-speed rail systems.As the velocity of high-speed trains continues to escalate and environmental conditions become increasingly complex,the phenomenon of pantograph-catenary arc drifting has intensified,thereby jeopardizing the safe operation of trains.To enhance the stability of the pantograph-catenary arc,this paper proposes a method to regulate arc using an AC transverse magnetic field(ATMF)and investigates the regulation law of ATMF on an arc in airflow environment.The results indicate that ATMF can effectively maintain arc stability,with the stability enhancing as the magnetic field frequency increases up to a threshold value.In an airflow environment,the stabilization effect is maximized at a frequency of 50 Hz,with arc voltage fluctuation at 4.65 V,accounting for only 5.47%of total arc voltage.It is also found that the arc temperature increases with the frequency of the magnetic field,reaching 4743 K at 10 Hz and 4976 K at 1000 Hz.In addition,the effects of sinusoidal,triangular and rectangular magnetic field excitation currents on the arc are investigated,and it is found that the arc shows the greatest stability in the triangular field,with a voltage fluctuation of 3.04 V.This study provides theoretical support for the application of ATMF regulation to enhance the stability of the pantograph-catenary arc.展开更多
基金supported by the Major Project of China Railway Co.,Ltd.(Grant No.K2021J004-A)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB22020201)。
文摘The consistency of the dynamic behavior of the mechanical equivalent model of high-speed pantographs with that of actual high-speed pantographs under service conditions is crucial for the correctness and accuracy of the numerical simulation results of the pantograph-catenary interaction.Firstly,based on experimental data and the finite element method,models of a mass-point frame and reduced pan head were established,which can simulate the rolling and pitching motion characteristics of the dual-strip pan head.The correctness of the finite element numerical simulation of the pantograph-catenary system based on the model was verified through an industry standard and line tests.Then,the variation law of the standard deviation of the contact force(SDCF)in the speed range of 240-450 km/h was studied,and the mechanism of large fluctuation in SDCF was explained from the perspective of pantograph-catenary resonance.Finally,the influence of pan head degree of freedom and low-pass filtering frequency of the contact force time-domain signal on SDCF was studied,and the applicable speed level of the traditional three-mass model and 20 Hz filtering were provided.
基金supported by National Natural Science Foundation of China (Nos.52322704 and 52077182)。
文摘The pantograph-catenary arc has persistently posed a challenge,impeding the advancement of high-speed rail systems.As the velocity of high-speed trains continues to escalate and environmental conditions become increasingly complex,the phenomenon of pantograph-catenary arc drifting has intensified,thereby jeopardizing the safe operation of trains.To enhance the stability of the pantograph-catenary arc,this paper proposes a method to regulate arc using an AC transverse magnetic field(ATMF)and investigates the regulation law of ATMF on an arc in airflow environment.The results indicate that ATMF can effectively maintain arc stability,with the stability enhancing as the magnetic field frequency increases up to a threshold value.In an airflow environment,the stabilization effect is maximized at a frequency of 50 Hz,with arc voltage fluctuation at 4.65 V,accounting for only 5.47%of total arc voltage.It is also found that the arc temperature increases with the frequency of the magnetic field,reaching 4743 K at 10 Hz and 4976 K at 1000 Hz.In addition,the effects of sinusoidal,triangular and rectangular magnetic field excitation currents on the arc are investigated,and it is found that the arc shows the greatest stability in the triangular field,with a voltage fluctuation of 3.04 V.This study provides theoretical support for the application of ATMF regulation to enhance the stability of the pantograph-catenary arc.
