Study on the Unsteady Aerodynamic Loads of High-speed Trains Exposed to Two-dimensional Stochastic Winds

doi:10.3901/JME.2016.06.108

Abstract

Abstract: To study the aerodynamic characteristics of high-speed trains exposed to natural winds, the numerical simulation method of two-dimensional stochastic winds considering the longitudinal and lateral fluctuating components of natural winds is set up based on the Cooper theory and harmonic superposition method. The simulated power spectral density of the fluctuating winds is compared with the target power spectral density in order to verify the validity of numerical simulation method of stochastic winds. The computational formula of unsteady aerodynamic loads of high-speed trains exposed to two-dimensional stochastic winds is derived. The numerical simulation is carried out for the train speeds of 200-400 km/h and mean wind speeds of 10-35 m/s. Computational results show that the stochastic wind has a large lateral component, which fluctuates slightly smaller than that of the longitudinal component. Whether the lateral component is included or not, the unsteady aerodynamic loads of high-speed trains are approximately normally distributed. The lateral component of stochastic winds has little impact on the mean of unsteady aerodynamic loads. However, it will lead to the increase of standard deviation of unsteady aerodynamic loads.

Key words: high-speed train, power spectral density, stochastic winds, unsteady aerodynamic loads

CLC Number:

U292

YU Mengge, LIU Dawei, ZHANG Jiye, CHEN Huanming. Study on the Unsteady Aerodynamic Loads of High-speed Trains Exposed to Two-dimensional Stochastic Winds[J]. Journal of Mechanical Engineering, 2016, 52(6): 108-115.

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