Analysis Of Vibration Reduction Effect For Railways With Typical Barriers

With the rapid development of high-speed train and dedicated passenger line, thecapacity and efficiency of train transportation increase greatly. But on the other hand,high-speed trains cause more severely dynamical response and the problems of vibration andnoise are becoming more and more prominent. When the level of noise and vibration reachsome extent, it will bring negative disturbing problems of noise and vibration for the peoplealong the track line. So the importance of studying on the environmental vibration problemscaused by high-speed train and controlling measures is immense. The typical vibrationisolation barriers are used for reducing vibration propagating energy. This vibrationattenuation method is more effective and is paid is paid more and more attention.In order to propose feasible vibration reduction and isolation measures, in this paper theproducing mechanism and propagating discipline of vibration due to high-speed train crossingwere analyzed. At the same time, the vibration wave and factors were studied. In this model,regarding the vehicle as moving load, the vibration actions caused by moving loads aretransmitted to the ground and nearby regions. Thus it will lead to a series of environmentalproblems. Based on the above analysis, the main content of research is organized as follow:1. Combining the field test of environmental vibration, the propagating discipline ofground-borne vibration induced by high-speed railway was analyzed. The analyzed resultsshow that the ground-borne vibration due to high-speed train belongs to middle or lowfrequent vibration. And the horizontal vibration and the vertical vibration are the same orderof magnitude. And the vibration level will decrease with the distance away from centerline.2. Using the Fourier transform method, the three-layer beam model of track structureunder vehicle dynamical load was solved. Combining MATLAB software, the impact ofvehicle speed on track structure dynamical characteristics were studied.3. In this paper, three dimension consistent viscous-spring boundary and equivalentviscous-spring boundary element were deduced. Combining classical examples, how to usesoftware ANSYS to simulate the vibration wave propagating in infinite field was analyzed.4. Using the finite element software-ANSYS, the vehicle-track-ground coupled3Dmodel was established. The ground-borne vibration responses under vehicle moving loadwere analyzed. Comparing calculation results with measured data on-site. The results showedthe model are feasible and accurate for predicting the ground-borne vibration due tohigh-speed train both in time and frequency domain. 5. And also via ANSYS, vehicle-continuous isolation barrier-ground coupled modelwere established successfully. The vibration isolation mechanism and principles of in-filledtrenches and air trenches are analyzed in three-dimension space. The influence of the trenchdepth, width, length and in-filled materials of isolation trenches on isolation effect has alsobeen studied.Finally based on summarizing the research, some problems for further study wereproposed.