Analysis Of Train Vibration Reduction Based On Ball-Screw Inerter

The vibration damping system of rail trains is an important part to ensure the smoothness of the vehicle and ride comfort,among which the vibration isolation system and vibration absorption system undertake the main work of train vibration damping,and include SD(Spring Damper)suspension and Dynamic Vibration Absorbers(DVA),which are more widely used vibration damping structures.With the improvement of rail train transportation demand,the damping efficiency of SD suspension and DVA has been gradually out of the development of modern rail trains,so the optimal design of damping system for rail trains has become a very meaningful research direction.Meanwhile,the inerter as a new type of damping element is widely used in the damping requirements of various engineering neighborhoods,so the use of inerter in rail trains to improve the damping performance of SD suspension and DVA is also a feasible idea to explore.Based on the "virtual mass" characteristic of inerter,this thesis has designed and optimized the structure and parameters of SD suspension and DVA respectively for the practical engineering application.The main aspects include the following:(1)Track train vertical dynamics modeling.A rail train vertical dynamics model with SD suspension and DVA,and a rail train excitation model with uneven track in Germany are established.(2)ISD(Inerter Spring Damper)suspension network integrated optimization design for rail trains.Based on the 1/4 rail train model,a specific ISD suspension physical structure is implemented using robust control combined with passive network synthesis,and the advantages of ISD suspension in rail trains in terms of vibration damping performance are discussed by comparing the conventional SD suspension structure after parameter optimization.(3)Design and experimental verification of ISD suspension for rail trains.The physical prototype of ball-screw inerter was designed and dynamics simulation was carried out,and the inertia capacity characteristics of the physical prototype of inerter were verified by the single-body experiment of ball-screw inerter combined with parameter fitting,followed by the performance test experiments of ISD suspension with ball-screw inerter and conventional SD suspension.(4)DVA performance optimization design for rail trains.Through intelligent optimization algorithm,the damping effect of conventional DVA and DVA with inerter type on ISD suspension rail train is compared,the mass range of ball-screw inerter that can replace the DVA oscillator is obtained,and the physical prototype parameters of inerter in DVA are calculated with the help of ball-screw inerter characteristics.The results of this thesis provide some guidance for the application of ball-screw inerter in rail trains.