A Simulation Method for Eliminating Unbalanced Forces of Dynamic Mesh in Pantograph-catenary Dynamic Behavior of High-speed Railway

Abstract

The invention discloses a simulation method for eliminating the unbalanced force of dynamic mesh of high-speed rail pantograph-catenary dynamic behavior. : time of each simulation step t In , the dynamic grid method is used to encrypt the grid around the contact point on the contact line; Step 3: Eliminate the unbalanced force in the dynamic grid through an iterative algorithm; Step 4: Through Newmark‑ β Algorithm to solve simulation step time t response; Step 5: Repeat steps 2 to 4 until the pantograph traverses the entire contact line to complete the pantograph-catenary dynamics simulation; the invention can eliminate the unbalanced force generated by the dynamic grid technology, and is used for nonlinear finite element solution , improve the solution efficiency and solution accuracy.

Description

technical field [0001] The invention relates to a simulation method for the dynamic behavior of the high-speed rail pantograph-catenary system, in particular to a simulation method for eliminating the unbalanced force of the dynamic mesh of the high-speed rail pantograph-catenary dynamic behavior. Background technique [0002] The high-speed railway pantograph and catenary system are responsible for transmitting electric energy for high-speed electric locomotives, and the continuous transmission of electric energy is realized through sliding contact between the pantograph and catenary; in order to study the complex dynamic behavior before the pantograph and catenary, the contact is usually constructed using the finite element method The mathematical model of the catenary, through the method of iterative solution to the dynamic response under the interaction of pantograph and catenary; however, due to the characteristics of large span and long distance of the catenary, the amo...

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Problems solved by technology

[0002] The high-speed railway pantograph and catenary system are responsible for transmitting electric energy for high-speed electric locomotives, and the continuous transmission of electric energy is realized through sliding contact between the pantograph and catenary; in order to study the complex dynamic behavior before the pantograph and catenary, the contact is usually constructed using the finite element method The mathematical model of the catenary, through the method of iterative solution to the dynamic response under the interaction of pantograph and catenary; however, due to the characteristics of large span and long distance of the catenary, the amount of calculation of the dynamic simulation of pantograph and catenary is very considerable; In order to improve the calculation efficiency of pantograph-catenary system, Jimenez-Octavio, Carnicero, Sanchez-Rebollo and Such et al proposed the moving mesh simulation technology of pantograph-catenary system. The achievement "A moving mesh method to deal with cable structures subjected to moving loads and its application to the catenary-pantograph dynamic interaction" was published in the journal "Journal of Sound and Vibration", Volume 349, pages 216-229; the core idea of ​​this method is to locally encrypt the contact near the contact point during the pantograph-catenary dynamic interaction simulation process The line grid can improve the calculation accuracy and efficiency; however, this method can only be used in the linear finite element model at present, and cannot consider the geometric nonlinearity caused by the large deformation of the contact line; when considering the geometry of the contact line When it is nonlinear, the newly generated dynamic mesh will generate a large unbalanced force, which will cause a large error and even fail to solve the problem.

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