Vibration Mapping Of Subway Transit Based On Random Vibration Theory

With the continuous expansion of the scale of city construction, the regional environmental situation in cities is becoming more and more complex. Track traffic environmental vibration problem in this new climate is gradually showing new situation and characteristics:Firstly, the network layout optimization of rail transit is gradually expanding more distant effects of environmental vibration caused by track traffic. Secondly, for the generally increasing demand for a better quality of life, the population that shows solicitude for environmental vibration induced by track traffic is getting larger. Finally, the strategic goal of sustainable development for cities is increasingly resting its hope on a global and complete environmental impact assessment. In view of the reasons of such three aspects, to carry out the prediction and evaluation of environmental vibration of big block, large area is gradually developing into a kind of objective and practical needs.Considering the limitation of coverage for the small block prediction model, traditional forecast model has been no longer enough for the research on traffic induced vibrations. Prediction and evaluation of urban rail traffic environmental vibration has been no longer remain in solving individual cases, while objectively requires to predict and display the status quo of environment vibration fleetly and intuitively with new feasible prediction model.In view of this, this paper take the focus on the rapid prediction and visualization display of the full area, large range environmental vibration along the underground railroad. First proposed the new management concept of vibration mapping, and developed the environmental vibration mapping software for underground railway.(1) Collected and sorted out the status of the domestic and foreign research on the city orbit traffic environmental vibration. And discussed the practical implications of the rapid prediction and visualization display of full area, large range environmental vibration along the underground railroad.(2) Established the two-dimensional frequency domain prediction model for the underground railway environmental vibration, combining with the random vibration analysis theory for vehicle/track coupling system and the linear elastic finite element analysis method for semi infinite object.(3) First proposed the new management concept of vibration mapping for the environmental vibration induced by underground railway.(4) Put forward the idea and method of developing and designing the environmental vibration mapping software for underground railway. And completed the integrated software for fast prediction and visualization management of the underground railway environmental vibration mapping.