Numerical investigation on the aerodynamic resistances of double-unit trains with different gap lengths

Li, Tian; Dai, Zhiyuan; Maruyama, Yu; Zhang, Weihua

doi:10.1080/19942060.2021.1895321

Cited by 43 publications

(13 citation statements)

References 18 publications

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“…This reduces the required computing resources, while ensuring a high calculation accuracy. At present, improved delayed detached eddy simulation (IDDES) based on the SST k-ω turbulence model is widely used to simulate the turbulent flow around high-speed trains [26][27][28]. The transport equations for SST k-ω model are given in detail in [29].…”

Section: Improved Delayed Detached Eddy Simulation (Iddes)mentioning

confidence: 99%

A Fast Approach for Predicting Aerodynamic Noise Sources of High-Speed Train Running in Tunnel

Qin¹,

Li²,

Wang³

et al. 2022

Computer Modeling in Engineering &Amp; Sciences

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The aerodynamic noise of high-speed trains passing through a tunnel has gradually become an important issue. Numerical approaches for predicting the aerodynamic noise sources of high-speed trains running in tunnels are the key to alleviating aerodynamic noise issues. In this paper, two typical numerical methods are used to calculate the aerodynamic noise of high-speed trains. These are the static method combined with non-reflective boundary conditions and the dynamic mesh method combined with adaptive mesh. The fluctuating pressure, flow field and aerodynamic noise source are numerically simulated using the above methods. The results show that the fluctuating pressure, flow field structure and noise source characteristics obtained using different methods, are basically consistent. Compared to the dynamic mesh method, the pressure, vortex size and noise source radiation intensity, obtained by the static method, are larger. The differences are in the tail car and its wake. The two calculation methods show that the spectral characteristics of the surface noise source are consistent. The maximum difference in the sound pressure level is 1.9 dBA. The static method is more efficient and more suitable for engineering applications.

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Section: Improved Delayed Detached Eddy Simulation (Iddes)mentioning

confidence: 99%

A Fast Approach for Predicting Aerodynamic Noise Sources of High-Speed Train Running in Tunnel

Qin¹,

Li²,

Wang³

et al. 2022

Computer Modeling in Engineering &Amp; Sciences

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“…The running speed of the high-speed train is lower than 360 km/h in this study, and the fluid can be considered as the incompressible one [17]. Therefore, the incompressible Reynolds averaged Navier-Stokes (RANS) and k-x shear stress transport (SST) turbulence model are used to solve the governing equations [18,19].…”

Section: Geometry and Mathematical Modelsmentioning

confidence: 99%

Numerical simulation and optimization of aerodynamic uplift force of a high-speed pantograph

et al. 2021

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Aiming at the problem that aerodynamic uplift forces of the pantograph running in the knuckle-downstream and knuckle-upstream conditions are inconsistent, and their magnitudes do not satisfy the corresponding standard, the aerodynamic uplift forces of pantographs with baffles are numerically investigated, and an optimization method to determine the baffle angle is proposed. First, the error between the aerodynamic resistances of the pantograph obtained by numerical simulation and wind tunnel test is less than 5%, which indicates the accuracy of the numerical simulation method. Second, the original pantograph and pantographs equipped with three different baffles are numerically simulated to obtain the aerodynamic forces and moments of the pantograph components. Three different angles for the baffles are −17°, 0° and 17°. Then the multibody simulation is used to calculate the aerodynamic uplift force of the pantograph, and the optimal range for the baffle angle is determined. Results show that the lift force of the baffle increases with the increment of the angle in the knuckle-downstream condition, whereas the lift force of the baffle decreases with the increment of the angle in the knuckle-upstream condition. According to the results of the aerodynamic uplift force, the optimal angle of the baffle is determined to be 4.75° when the running speed is 350 km/h, and pantograph–catenary contact forces are 128.89 N and 129.15 N under the knuckle-downstream and knuckle-upstream operating conditions, respectively, which are almost equal and both meet the requirements of the standard EN50367:2012.

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“…Li et al [17] managed to weld a low-content steel M190 through FSW. e most common model to calculate input temperature using the FSW is available in equations ( 1) and (2).…”

Section: Friction Stir Welding (Fsw)mentioning

confidence: 99%

Mechanical and Formability Evaluation of ST14 Alloys Welded by Friction Stir Welding

Afshari

Fakhralmobasheri

Samadi

et al. 2021

Shock and Vibration

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Friction stir welding as one of the modern methods of solid-state welding of steel sheets and aluminum is a highly regarded industry. In these studies, the experimental design and response surface methodology were used. Optimization of experimental conditions and results which are compared with good agreement between the results was observed. The mechanical properties and ductility of welded plates under optimal conditions were studied. Microhardness testing, metallography, tensile testing, and limiting dome height were used to investigate the mechanical properties and formability limit diagram attached, respectively. The results showed that the heat-affected zone is very small and narrow and not easily distinguished from the base metal. In all tests, the failure of the dome height limit in the area was chaos. In all samples welded with the optimal parameters, tensile failure occurred in the base metal region. Turbulence in the region confirms the presence of WC particles. Experimental design and response surface methodology could introduce an optimal state, and the creation of common defects in the FSW process can prevent the binding strength of the guarantee. But due to the lack of proper stirring in the perturbation area in the samples welded with non-optimized parameters, the strength of the connection is not suitable, and samples were broken from the SZ region.

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Numerical investigation on the aerodynamic resistances of double-unit trains with different gap lengths

Cited by 43 publications

References 18 publications

A Fast Approach for Predicting Aerodynamic Noise Sources of High-Speed Train Running in Tunnel

A Fast Approach for Predicting Aerodynamic Noise Sources of High-Speed Train Running in Tunnel

Numerical simulation and optimization of aerodynamic uplift force of a high-speed pantograph

Mechanical and Formability Evaluation of ST14 Alloys Welded by Friction Stir Welding

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