Study On Characteristics Of Aerodynamic Load On Less-loading Noise Barrier Based On Laboratory Experiments And Simulation

With the rapid development of China’s high-speed railway, the noise pollution generated by high-speed train is getting worse. Pulsating air pressure generated by high-speed trains, will affect the safety and reliability of noise barriers adversely, general sound barrier has been unable to meet the requirements. Therefore there’er not only to have good load shedding characteristic, but also have good sound absorption property, load-shedding noise barrier is an important technical approach. The paper designs different types of load-shedding noise barrier models, analyze the influence of various factors on load shedding characteristic and sound absorption property on the barriers, provide the basis for researching to improve the spatial of reduction effect.Firstly, the paper analyzes the flow mode used in the calculation, apply Fluent to set up12different types of simulation models of load-shedding noise barrier. On this basis, simulate the aerodynamic characteristic and load shedding characteristic of cylindrical barriers, slice barriers etc, access to the influence rule how internal structure, air velocity, air flow and other factors impact load shedding formula and aerodynamic load characteristic.Secondly, study the models of the less-loading noise barriers equivalent to a uniform porous medium. Determine the method to calculate the equivalent viscous resistance factor and inertial resistance factor; make6types of less-loading noise barriers equivalent to uniform porous mediums, carried out the deviation analysis of the pressure and differential pressure.Again, eight types of noise barriers were tested in the wind tunnel. Determine the reasonable laboratory equipments, experimental program. Test the strain, pressure etc of the less-loading noise barriers under different wind speeds, and analyzed the influence, get the average aerodynamic load and load reduction rate.Finally, design and analyze the structure of the V-shaped noise barrier. Verify the three-dimensional model of V-shaped noise barrier, design and analyze the chamfer of V-shaped noise barrier, establish two-dimensional model, study the relationship between load-shedding feature spacing and chamfer of V-shaped noise barrier, and get the equation.The research result of this thesis can provide analysis and disposition basis for the research and development of the research of load-shedding noise barriers.