Simulation Study Of Vehicle-Bridge Coupling Vibration For Suspended Monorail Transit System

Suspended monorail transit system is a form of urban monorial tansit, in which the vehicle travels along the rail through the bogie frames above meanwhile the vehicle body is suspended under the track beam. Within the next few years, suspended monorail transit system will show vast potential for future development with the advantages of low cost and short construction cycle. Currently, the suspended monorail has not been studied systematically in China, and there is a lack of relevant information. Based on the method of vehicle-bridge coupling vibration theory, the vehicle and bridge is taken as an interaction and coordination system. The general FEM software ANSYS and multi-body dynamics software SIMPACK are adopted respectively to establish the finite element model for bridge and the multi-body vehicle mode, and the co-simulation method is adopted to correlate ANSYS and SIMPACK to investigate the vehicle-bridge coupling vibration. The main procedures are follows:Firstly, the development history and present situation for suspended monorail transit system are reviewed. Combined with current situations in china, the structure form for suspended monorail of Qian-ye line in Japan is adopted as reference. The characteristics, technical parameters and design standard of track beam are expounded, the span, key dimensional of both track beam and pier are optimized. A suitable bridge model for suspended monorail is established finally, and it is supplied for the follow vehicle-bridge coupling vibration analysis.Secondly, a 41-degree-of-freedom vehicle model has been established in SIMPACK. The procedure of how to import the finite element model of bridge into multi-body dynamic system with the method of substructure analysis in ANSYS is expounded. The method of how to transform traditional track irregularities into road surface roughness excitation is raised, and the analysis of vehicle-bridge coupling vibration for suspended monorail transit system has come to realize.Finally, this thesis raises the evaluation criteria for vehicle and bridge. The dynamic responses of suspended monorail transit system are calculated, and the effects of vehicle speeds, track irregularities and train formation on the bridge and vehicle body are discussed separately. Also, the dynamic effects of vehicle and bridge have been evaluated based on the criteria raised previously, which can provide a reference for the future development of suspended monorail transit system at home.