Research On Wind-induced Vibration Law And Wind Resistance Performance Of Catenary Wrist Device Of High-speed Railway

China’s 13 th Five-Year Plan has come to a perfect conclusion.By the end of 2020,China’s railway operating mileage has reached 146,300 kilometers,of which high-speed railways have reached 38,000 kilometers and the electrification rate reached 72.8%.On the one hand,China has about 10,000 kilometers of railways in areas prone to wind-induced disasters,accounting for about 35% of the total mileage.On the other hand,as the train speed increases,when the train enters and exits the tunnel entrance,a large air pressure difference will be formed inside and outside the tunnel entrance and the front and rear parts of the train,which will cause a certain air pressure impact on the wrist device.If the structural strength design is relatively weak,safety problems will occur,and if the structural strength design is excessive,the cost will increase.If it is necessary to investigate whether the wrist device can withstand the action of strong wind,and further confirm the structural strength design of the wrist device in the windy area,it is necessary to study the wind-induced vibration law and wind resistance performance of the high-speed railway catenary wrist device.This paper analyzes the meteorological data to obtain the fluid-structure coupling calculation of the input wind speed of the wrist device;through the 3D mapping software solid modeling simplification and mesh division to perform fluid mechanics and introduce the theory of fluid-solid coupling to carry out theoretical analysis before simulation of the wrist device;performs steady-state fluid-solid coupling simulations on the wrist device under different wind attack angles and different wind speed levels,study its wind pressure distribution law and mechanism and conducts wind-induced response and stability analysis,and compares verify the calculation method.Finally,the static equivalent method is used to analyze the response analysis of the reverse positioning structure under fluctuating wind pressure,and the dynamic force of the contact suspension on the hanging point under the 0° and 180° wind attack angle and 50m/s fluctuating wind pressure on the wrist device is studied to analyzes the influence.Through the mesh division and boundary definition of the wrist device model,a fluidstructure coupling three-dimensional simulation model with different wind speed levels and different wind attack angles of the forward and reverse positioning structures is obtained.Through meteorological investigations,the design wind speed and structural design wind speed of catenary in strong wind areas are mainly concentrated in 30m/s～50m/s.The fluid dynamics simulation calculations for the two structures at 90°and 135°wind attack angles and 30m/s～50m/s wind speed levels show that the maximum wind pressure on the surface of the wrist device appears under the action of 50m/s wind speed,and the surface is the largest wind pressure is104 k Pa,and the maximum wind pressure difference is 9k Pa,wind speed and angle of attack are the main factors that affect the maximum wind pressure on the surface of the wrist device.The wind pressure difference between the windward and leeward sides of the wrist device increases as the wind speed increases,and related to the angle of attack of the wind.Through steady-state fluid-solid coupling simulation calculations,the wind speed is positively related to the maximum stress of the structure and the wind-induced displacement,the maximum structural stress increases and the vibration displacement increases.The maximum stress of the anti-positioning structure is 179.60 Mpa,which appears under the action of a wind attack angle of 90° and a wind load of 50m/s,under the same working conditions,the maximum stress of the anti-positioning structure is greater than that of the positive positioning structure,and the 90°wind attack angle is greater than 135°wind attack angle,but they are all within the allowable stress range of the material.The wind-induced vibration displacement of the wrist device mainly focuses on the positioning tube and the positioner,and under the structural strength failure load,the instability phenomenon will not occur,and the simulation method in this paper is verified by comparison.The pulsating wind pressure load is simulated by the static equivalent method,and the corresponding gust coefficient is calculated according to the aforementioned different boundary conditions.The gust coefficient is within 1.007,there is little difference between the pulsating wind response of the wrist device and the steady-state wind response.Based on the wind network dynamic model to obtain the dynamic load of the hanging point,and further analyze the dynamic response of the wrist device.The results show that the maximum stress of the wrist device is 210.75 Mpa,which appears when the anti-positioning structure is in contact with the suspension and is subjected to dynamic wind at a wind attack angle of 0°.The maximum wind-vibration displacement is 253 mm,which appears when the positive positioning structure is exposed to the dynamic wind pressure of the 180° wind attack angle when the contact suspension is in contact,all working conditions meet the structural strength requirements.