Design Of Load Adaptive Nonlinear Secondary Suspension System Of Railway Bogies

With the rapid development of China’s national economy and the optimization and upgrading of industries,the railway freight transportation lines of economic products such as coal and ore are getting busier and busier,the time interval between freight trains is gradually shortened,and the freight density is approaching saturation.Live at the same time,in recent years the increasingly proportion consumer shopping online shopping,and then to express freight industry thriving on the speed of the railway transport efficiency also put forward higher requirements,how to implement the speed increase and heavy haul freight train further give full play to the potential of existing railway line,become the main direction of the future of railway freight In this paper,based on the practical requirements and considering the limitations of the traditional linear vibration isolation theory,the nonlinear vibration isolation theory is used to improve the design of the traditional freight train bogie secondary suspension system,improve its vibration isolation effect,so as to achieve the purpose of highspeed and heavy load freight trainFirst of all,this article is based on a geometrically nonlinear SD vibrator theory proposed by Professor Qingjie Cao of Harbin Institute of Technology in 2006.The two-link-spring-mass system is established in parallel with the vertical spring,taking into account that it is inevitable in practical engineering,the offset is introduced in the article to explore the parameter conditions of the zero stiffness system,the quasi-zero stiffness system,the degenerate linear stiffness system and the quasi-K stiffness system,use the averaging method to solve the vibration equation,and obtain its amplitude-frequency response equation and the transfer rate equation,and the expression of the initial vibration isolation frequency,analyze the influence of the offset and other parameters on the vibration isolation mechanical parameters of the system,further improve the nonlinear quasi-K stiffness vibration isolation theory,and lay a solid foundation for the further engineering application of the theory.Afterwards,the established double-link negative stiffness unit is introduced into the secondary suspension system,the truck bogie with old rubber spring,establish nonlinear quasi secondary suspension vibration isolation system stiffness K,secondary suspension system on the train line analysis of new car body kinetic parameters under the condition of the optimization function and curve under the condition of the curve of the freight train through if there is a significantly worse performance The quasi-K-stiffness second-series suspension system reference object with offset is symbolically set to conduct the whole vehicle Simpack dynamics simulation and compare with the simulation results of the original vehicle to explore the importance of the vibration isolation effect of the load adaptive function alignment nonlinear vibration isolation system.Finally,according to the existing three-dimensional model of the bogie and the experimental conditions of the whole vehicle rolling platform,refer to the simulation results,extract the key data,determine the mechanical parameters,design the physical prototype of the load-adaptive vibration isolator,check the strength of the key mechanical components,and issue the design plan,To lay the foundation for the follow-up vehicle rolling experiment and further engineering application.