Aerodynamic load spectrum and fatigue behaviour of high‐speed train's equipment cabin

Abstract

In present study, the aerodynamic fatigue behaviour of train equipment cabin was investigated. Pressure sensors were arranged at train passing side. Eight‐grade load spectrum was constructed by means of rain‐flow counting, and fatigue damage was calculated with Miner's rule and Carten‐Dolan rule, both for the matrix metals and welds. For welds, defect detection was considered via visual inspection with nondestructive test (VI‐NDT), pure nondestructive test (P‐NDT), and without nondestructive test (W‐NDT). The result confirms that welds play an unfavourable role rather than matrix metals. Weld damage in W‐NDT exceeds its limit (1.0) to designed mileage. Then, damage influence was studied under tunnel passing, train passing, and running direction. Running direction as the head car contributes 82% to approximately 86% and 70% to approximately 77% of the total damage for matrix metal and welds, respectively. Train passing gives more damage to matrix metals than welds. Tunnel passing contributes 25% to approximately 26% for both matrix metals and welds.

Research on the fatigue strength of the installation bracket of the platform detection device under complex environments

“…al. [3] studied the aerodynamic characteristics of train equipment compartments and found that when the vehicle is running as a lead car, the damage caused by aerodynamic loads is the greatest.…”

Methods for calculating aerodynamics inside high-speed railway tunnel lining cracks and predicating stress intensity factors

“…Li et al (2022) discovered a linear relationship between the residual fatigue life of a shield tunnel and the cycles of aerodynamic pressures. Furthermore, researchers have also examined the fatigue damage characteristics of high-speed trains (Lu et al , 2019; Song et al , 2015; Zhou et al , 2019) and auxiliary structures inside tunnels (Wang et al , 2021) under the loading of aerodynamic pressures. However, there is a lack of studies investigating the mechanical behavior of tunnel lining cracks subjected to ICWs.…”

Experimental simulation of alternating aerodynamic loads induced by high-speed trains passing in tunnels

“…7,8 On the other hand, it gives rise to the pressure difference between the internal and external of the vehicle body. 9,10 The alternating pressure variance causes hidden dangers including fatigue failure of vehicle body structures. 11–13…”

“…7,8 On the other hand, it gives rise to the pressure difference between the internal and external of the vehicle body. 9,10 The alternating pressure variance causes hidden dangers including fatigue failure of vehicle body structures. [11][12][13] On passenger comfort, the internal pressure and wave velocity climb up drastically as the train speed increases when passing through tunnels.…”