Study On The Interface Load Of Four-module Low-floor Trams

In this paper,in the process of low-floor vehicle strength analysis,the problem of large marshalling calculation model,slow feedback,and cumbersome boundary condition analysis,relies on a four-module low-floor tram,and summarizes and verifies a method for quickly obtaining interface loads.Provide some references for the technical research of low-floor vehicles.The specific research content is as follows:First,a brief introduction to the development and research of low-floor trams is given.In view of the problems of large marshalling models,difficulty in articulation simulation,and inability to parallel design encountered in the strength analysis of low-floor car bodies,the calculation of single module separation is summarized and proposed.method;Then,based on the two industry standards EN 12663 and VDV 152,the force analysis of the three types of check conditions specified in the standard is carried out,and the interface load equation is theoretically deduced and solved under reasonable assumptions.In addition,a typical working condition was selected from the three types of check working conditions,grouping calculation and module separation calculation were carried out,and the interface load size and structural stress of the two calculation results were compared and analyzed,and the engineering error was within the acceptable range.The reliability of the single-module separation calculation method is verified.Finally,the interface load equation is used to analyze the influencing factors of the hinge force under the longitudinal load condition.The system studies the numerical relationship between the force of the Mc1 module fixed hinge and the closed hinge and the hinge stiffness K,the longitudinal offset of the center of massΔ,and the aspect ratio R.Finally,the research results were compiled and packaged in software.The research results show that:for the four-module low-floor tram,the module separation method can accurately obtain the interface load within the acceptable range of engineering error,and facilitate the verification of the strength of the car body structure and the optimization of the design parameters;the articulated load of the Mc₁ module It will be affected to different degrees by related parameters such as hinge stiffness K,center of mass offsetΔ,etc.The application process can design the structural parameters according to the expected load according to the load equation.