Development And Research Of High-Speed Collision Test Train Of Rail Vehicle

Rail vehicle plays an important role in economic development.The increase in operating speed has shortened the space distance,and has also caused people to consider the safety of vehicle operation.On one hand,China has increased its investment in the active safety of rail vehicles.On the other hand,the passive safety of rail vehicles has gradually been put on the agenda.Various energy absorbing elements such as anticlimbing devices,coupler buffers,etc.are generally installed at the vehicle end of the rail vehicle.These energy absorbing elements can absorb the vehicle during the process of starting,braking,accelerating and decelerating through its own small deformation.Part of the energy can also absorb the collision energy between the car bodies through the destruction of its own structure when the rail vehicle collides,thereby reducing the deformation of the car bodies structure.The most direct and effective way to study the working performance of the energy-absorbing components at the vehicle end is to carry out a crash test.There are many types of rail vehicles in China,and the types,numbers,and locations of energy-absorbing components carried by different types of vehicles are also quite different,therefore in order to study the working performance of energyabsorbing components and at the same time reduce the test cost,it is necessary to develop a versatile high-speed collision test train.In view of the need to adjust the height of the vertical center of mass of the highspeed collision test train,design two schemes based on SolidWorks,and compare the advantages and disadvantages of the two schemes to complete the choice of schemes.The dichotomy method was used to design the mass of the weight,and the combination of different specifications heavy weights can achieve the error control of the whole vehicle quality within 0.1%.and at the same time effectively fix the weights to reduce the impact of mass errors and the sway of the weights on the collision energy of the vehicle.Hypermesh and Ansys checked the rationality of the design of the counterweight frame.The counterweight unit used the equivalent feedback synchronous control method in the electro-hydraulic servo system to achieve synchronous lifting movement.The working principle,composition and function of the electro-hydraulic servo control were studied.The hydraulic components in the electro-hydraulic servo system are calculated and selected.The force of the wheelset during braking is analyzed,the relationship between the force,and the relationship between the adhesion coefficient and the slip rate.The design of the structure of the brake unit and the automatic triggering brake device was designed,and calculate the ideal brake air pressure and speed curve of each axis when the highspeed collision test train brakes at the maximum slip rate under different working conditions.By combining and controlling the two sets of solenoid valves on each wheel pair,the air pressure in the brake air chamber appears in three states of boost,holding pressure and decompression,so that the brake air pressure in the brake air chamber follows the ideal brake air pressure curve.Three working conditions were used to verify the effect of the combined control of two sets of solenoid valves on each axis.It was obtained that the air pressure value in the brake air chamber fluctuated around the ideal air pressure curve,and the fluctuation range met the test requirements.During the test,the brake control box was mainly subjected to vibrations in the collision direction and the vertical direction,and the brake control box was designed with double-layer vibration isolation in these two directions.The vibration frequency of the vibration excitation was unknown.The formula calculation method can not get the stiffness and damping values of the isolator,and in two directions,respectively,using the method of building a model in AMESim to simulate,by adjusting the stiffness and vibration of the inner and outer two sets of isolators damping value to ensure that the vibration isolation effect of the isolator meets the design requirements.The working environment of the support frame of the brake control box is studied,and the static and modal simulation calculations of the designed structure are performed to verify the brake control box.The stiffness and mode of the support frame meet the design requirements.