Dynamics Research Of Piggyback Transport System Based On Simpack

With the rapid development of high-speed railway technology,the traditional railway transport capacity has been greatly released,which provides infrastructure conditions for the development of piggyback transport.The piggyback transport integrates the advantages of railway and highway transportation.With this transport,not only can the freight efficiency be improved by reducing the loading and unloading links,but also the freight cost can be reduced.More importantly,the development of swap trailer transport and unitized transport also be improved.The piggyback transport fits in with requirements of comprehensive transportation development in China,which is also an important developing direction of Chinese freight transportation in the future.Piggyback transportation is still in its infancy in China.It lacks practical operation experience.And its safe operation conditions can not be mastered.Therefore,it is of great significance to study the system of piggyback transportation vehicles.In this paper,based on the research of domestic and foreign rail vehicle dynamics,the model of the piggyback transport system was established by Simpack software and the dynamics simulation was carried out.Then the safe operating condition of the piggyback transport is studied by means of the real vehicle test.Firstly,the structure of the piggyback transport vehicle system is introduced,and then the dynamic model is established based on the main technical parameters of railway piggyback transport vehicle and the highway semi-trailer in this thesis.The vibration factors are considered comprehensively to realize the model simplified in the running process of the vehicle system.After that,the boundary conditions of simulation are defined by applying spectral excitation.Finally,the third-order vibration model and preliminary simulation of the piggyback transport system are completed by Simpack.Secondly,three kinds of simulation analysis are carried out for the piggyback transport vehicle system,including critical velocity simulation analysis,curve passingcapacity simulation analysis and simulation analysis of vertical stability influenced by suspension parameters.And then the dynamic characteristics of this system are studied.Finally,the running test of the piggyback transport system is carried out,and the accuracy of the model is verified by the test results.The test analysis shows that when the speed of half-loaded piggyback transport system is between 90 km/h and 130km/h,Under the condition of gradual increase of test speed,the acceleration of vehicle body increases,and the running stability coefficient can meet the requirements.When the operating speed is less than 100km/h,the security class of the running stationarity of the transport vehicle is first-degree.When running at a speed of100-130km/h,the security class of running stationarity is second-degree.Strength checking calculation and structural improvement of wheel blocking device are carried out,and the safety of the piggyback transport vehicle system was improved.