Aerodynamic Pressure And Dynamic Response Of Railway Sound Barrier Under Mutant Wind

When a high-speed train is running on a railway with a sound barrier,it will have a transient pulsating pressure impact on the sound barrier,which may damage the sound barrier.Especially in the windy areas along the coast,the wind speed changes indefinitely,and the action time is also different,which makes it necessary to consider the wind pressure resistance when the structural design of the sound barrier.In order to solve the safety problem of sound barriers in strong wind areas,it is necessary to analyze the wind pressure and dynamic response of the sound barriers of high-speed railways under various working conditions and various environmental conditions,and conduct research on the wind resistance of the sound barriers.The research content of this article is divided into two parts.First use the method of CFD analysis,Aerodynamic performance simulation of train passing sound barrier under the coupling of train wind and natural wind,Study the aerodynamic distribution on the surface of the sound barrier under the action of different types of wind,compare and analyze the aerodynamic force at the measuring point,study the type of wind,the speed of the train,the height of the sound barrier and the distance between the car and the sound barrier The influence law of aerodynamic force on the surface of sound barrier;Analyze the aerodynamic pressure distribution characteristics of the sound barrier when the two vehicles meet under the action of two wind fields.Secondly,the aerodynamic simulation results are mapped to Workbench-Transient Structure software as a function to realize fluid-structure coupling simulation,and the transient dynamic analysis of the sound barrier finite element model is carried out to study the total deformation,equivalent stress and its mode State distribution characteristics.The study concluded:When the train speed is 350km/h and the sound barrier is 3.3m away from the track centerline,the pulsating pressure is the largest and the aerodynamic pressure at the root is the largest.It slowly decreases in the height direction and then decreases quickly.The effect of"head wave"and"tail wave"is more obvious under the action of cross wind,The aerodynamic pressure of the sound barrier under the action of abrupt wind is orders of magnitude greater,The hysteresis effect is more obvious,Within the time period of sudden wind function 1.5s～2.0s,The"tail wave"has a great influence on the pulsating wind pressure of the sound barrier,and the maximum negative pressure reaches-2775Pa,The negative pressure generated by the crosswind reached-1391Pa,It can be seen that the maximum negative value of the pulsating wind pressure of the sudden wind on the sound barrier is twice that of the cross wind.Second,the modal distribution shows that no structural resonance occurs.Finally,when the head and tail cars pass through the sound barrier area,The maximum acceleration peak of the transparent plate is 11.63m/s~2,and the minimum acceleration peak of the aluminum alloy panel is 6.18m/s~2.The maximum displacement peak and the maximum equivalent stress peak both appear immediately after the sudden wind load is applied,The maximum displacement and deformation of the transparent plate reached 8.36mm,and the maximum equivalent stress of the column reached 50.76MPa.The minimum displacement peak and the minimum equivalent stress peak both appear when a stable wind load is applied,The minimum amount of displacement and deformation of the aluminum alloy panel is 1.63mm;the minimum equivalent stress of the transparent plate is0.85 MPa,It can be seen from this that the dynamic response of the column and the transparent plate is more significant,and the dynamic response of the transparent plate is slightly larger than that of the column,And it is verified that the sound barrier models meet the safety standards.In engineering design,provide engineers with some theoretical basis and design references.