| In recent years,China’s high-speed railway transportation has developed rapidly,passengers are increasingly demanding the more smooth and more comfortable ride of rail vehicles,and the impact of rail vehicle hydraulic shock absorbers on these performances is particularly important.If the double-cylinder hydraulic shock absorber for rail vehicles has unstable performance during development and operation,it would have a bad influence on the smooth running and steering stability of the train.Therefore,it is necessary to study the performance stability of the hydraulic shock absorber of rail vehicles.This topic mainly aims at the double cylinder hydraulic shock absorber used in the rail cars of Hangzhou metro line four.This type of damper has the advantages of simple structure,low noise and long service life.However,due to the design and development stage,it is difficult to accurately calculate the damping characteristics through theoretical analysis,therefore,it is necessary to test the damping characteristics of this type of damper when testing sinusoidal excitation of different speeds and fixed amplitudes(damping force-displacement curve and damping force-speed curve).In the process of product development,external characteristic tests are needed to determine the factors affecting the stability of the damper performance and the degree of its impact.This part both consumes time and wastes a lot of manpower and material resources.Since there is no accurate theoretical calculation model,after finding these influencing factors,it is necessary to make a matching adjustment to one or more of its parameters through a large number of experiments.It also increases development time and development costs.Therefore,it is urgent to accurately model andsimulate this type of damper,and to adjust a parameter or plurality of parameters in this model of the damper.Through observing the damping characteristic diagram,we could analyse the factors that influence the stability of the damper performance.Then test the results based on the model analysis results.This will not only reduce the workload during the development phase,but also save research and development costs,moreover,better expected results can be obtained,and the performance stability of the damper is fully understood,which has reference value for its subsequent development.Firstly,the structure of the double-cylinder hydraulic shock absorber is analyzed,and the hydraulic system diagram of the shock absorber is drawn according to the working principle of the shock absorber.Then determine the factors affecting the performance of the damper according to the damper design theory,make the influencing factors established as variables,and a mathematical model for the performance study of the damper is built.Secondly,use MATLAB/Simulink software to simulate the mathematical model of damper performance research in order to get the shock absorber damping characteristics of the simulation model.The simulation model is used to simulate the structural parameters of the damper.On next step,the external component of the performance of a certain type of damper is tested for external characteristics,and the component is subjected to Simulink simulation,then compare the simulation results with the test results,the conclusion that the influence of the design parameters of the damper on the damping performance of the damper is obtained.At the same time,aiming at the performance stability of the damper,through the performance test of other structural parameters of the damper,the scheme of improving the oil circulation of the damper is proposed,and thecorresponding conclusions are obtained.Finally,the research on the double-tube hydraulic damper has been summarized,and the related research is proposed. |
PDF Full Text Request