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Study On Power Flow Theory And Application Of High-Speed Railway Track With Anti-Vibration Structure

Posted on:2019-03-10Degree:DoctorType:Dissertation
Country:ChinaCandidate:N FuFull Text:PDF
GTID:1312330566462427Subject:Road and Railway Engineering
Abstract/Summary:PDF Full Text Request
The vibration and noise problems caused by high-speed trains become increasingly remarkable which are harmful to human work and life and wild animanls’ breeding.In order to control the environment vibration,some vibration isolation measures are taken in the track structure which may increase the vibration energy in the track structure inversely.The increased vibration energy in the track components would lead to the failure of track components as well as the track structure damage which increase the cost of operation and maintenance of high-speed railways(HSR).Based on the project of ‘Study on Vibraion and Noise Reduction Performance of Ballastless Track in Enviromental Sensitive Area of Chengdu-Lanzhou Railway’,power flow theory of the ballastless track with anti-vibration structure in HSR is established and is applied in the study of the vibration energy properties of double-block track with anti-vibration structure.Besides,a vibration energy evaluation method is put forward.The main contents are listed as follows:1.Summarize the research results of track dynamics both in the time domain and the frequency domain.Outline the current research status of power flow theory,and then propose the main problems and insignificances of track dynamics.2.Apply power flow theory in the study of vibration energy properties of the ballastless track with anti-vibration structure in high-speed railway.Taken the double-block track with anti-vibration structure used in Chengdu-Lanzhou HSR as an example,establish a spectra power flow model and a mobility power flow modle of the track structure respectively and then propose a track structure vibration energy evaluation method.3.Analyze the vertical vibration energy transmission mechanism of damping track.Calculate the power flow of the double-block track with anti-vibration structure under harmonic loads by mobility power flow method and discuss the vibration energy transmission properties in vertical direction in the damping track on the subgrade and on the bridge respectively.Then analyze the influence of setting damping pads or not and the effect of key track structure parameters on the power flow.4.Study the mobility properties of the double-block track with anti-vibration structure,and calculate the power flow of damping track by the spectra power flow method under different conditions of track irregularity spectra types,train velocities and key parameters.Finally reveal the vibration energy redistribution laws of the damping track.5.Based on a vehicle-track-subgrade/bridge coupling dynamic model,analyze the vibration energy properties of ballastless damping track and its influence on a specific engineering problem,that is,polygonal wear of wheels,by mobility power flow method under the condition of the short wave track irregularity and the medium/long wave track irregularity respectively.6.Evaluate the vibration energy properties of the double-block track with anti-vibration structure using indexes of the average vibration energy level and the vibration energy transfer rate,according to the track structure vibration energy evaluation method.Analyze the influence of key track parameters and setting damping pad or not on the properties of the vibration energy transmission and distribution.Finally suggest suitable values of stiffness of the damping pad and fasteners.
Keywords/Search Tags:high-speed railway, double-block track with anti-vibration structure, power flow, energy transmission, energy redistribution
PDF Full Text Request
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