Analysis of unsteady flow field and near-field aerodynamic noise of scale high-speed trains in long tunnel

Ouyang, Menghan; Chen, Shuo; Li, Qiliang

doi:10.1016/j.apacoust.2023.109261

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…The radiated sound power is directly proportional to the 4th, 6th and 8th power of the airflow velocity respectively. 18 The sound power of the three sources is defined asWhere WM, WD, and WQ are the sound power radiated by the three acoustic sources; kM, kD and kQ are the scaling factors and are constants; ρ is the air density; u is the velocity of the acoustic source; d is the characteristic size of the acoustic source; c is the sound speed.…”

Section: High-speed Train Aerodynamic Noise Prediction Methodsmentioning

confidence: 99%

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Numerical simulation and prediction of aerodynamic noise of high-speed trains

Liu,

Zhang,

2023

Noise & Vibration Worldwide

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In order to improve the efficiency of high-speed train aerodynamic noise analysis and provide a feasible method for aerodynamic noise prediction, the aerodynamic noise and its influencing factors are analyzed from the perspective of the total energy (sound power) radiated to the far field per unit time by the aerodynamic fundamental noise sources (monopole, dipole and quadrupole sources). A full-scale and a 1:8 scale-down computational fluid dynamics model of a high-speed train are established. The far-field sound pressure level at several receivers and velocities is calculated by using the transient large eddy simulation and the FW-H equation. The numerical simulation results are used to predict the aerodynamic noise under specified working conditions. The research work can achieve the prediction of aerodynamic noise at other velocities using noise data at known velocities on the same noise source case, as well as the prediction of aerodynamic noise of full-scale model using data of scale-down model, and is applicable to either bogies as local noise sources or the complete vehicle as a noise source. The maximum error between the prediction and simulation result is 0.33 dBA under various working conditions, which meets the engineering calculation requirements.

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Section: High-speed Train Aerodynamic Noise Prediction Methodsmentioning

confidence: 99%

“…The radiated sound power is directly proportional to the 4th, 6th and 8th power of the airflow velocity respectively. 18 The sound power of the three sources is defined as…”

Section: Far-field Aerodynamic Noise Under Point Noise Sourcesmentioning

confidence: 99%

Numerical simulation and prediction of aerodynamic noise of high-speed trains

Liu,

Zhang,

2023

Noise & Vibration Worldwide

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“…Wang [36] established a train aerodynamic model to study the aerodynamic characteristics of high-speed trains under the action of two different lateral winds: average wind and index wind. Ouyang [37] used hybrid LES/APE method to simulate the unsteady flow field and the near-field aerodynamic noise of a 1/25 scale eightcoach high-speed train in long tunnel to study the changes in sound pressure in different cases, including tunnel with fully reflective walls and tunnel with fully absorptive walls and open air. S. Maleki et al [38] used various turbulence modeling approaches including ELES, SAS, URANS and RANS to predict the aerodynamic flow around a double-stacked freight wagon.…”

Section: Introductionmentioning

confidence: 99%

Flow-Induced Vibration Hybrid Modeling Method and Dynamic Characteristics of U-Section Rubber Outer Windshield System of High-Speed Trains

Liu

et al. 2023

Applied Sciences

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The flow-induced vibration characteristic of the U-section rubber outer windshield structure of high-speed train is the key factor to limit its high-speed movement. Accurate and effective flow-induced vibration analysis of windshield structures is an important topic. In this paper, a hybrid modeling method for the analysis of flow-induced vibration of windshield structure is innovatively proposed for the U-section rubber windshield system of high-speed train. The method uses the external aerodynamic load obtained by aerodynamic simulation as the input condition of the flow-induced vibration model, and maps the aerodynamic load to the structural dynamics model characterized by the modal test data of the windshield structure. The flow-induced vibration model is established by means of modal superposition method and the time-domain response is effectively integrated by Runge Kutta method with variable step size. The results show that this method can effectively simulate the flow induced vibration of the wind baffle structure, and the real-time relationship between the aerodynamic load and the modal characteristics of the structure and the response of displacement and velocity can be obtained. On this basis, the comprehensive dynamic performance of the windshield system of high-speed trains at 400 km/h under external aerodynamic load is studied, that is, the force, displacement and velocity variation rules of the flexible structure are examined. It is determined that the displacement and velocity response curve of the measuring point near the lower side of the U-section rubber outer windshield is significantly higher than that of other parts. Moreover, the contribution of the first mode to the dynamic response of the structure is very obvious. This method provides an efficient calculation method for analyzing the flow-induced vibration characteristics of complex flexible structures.

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Effect of coupled vibration modes of dual-strip pan head on pantograph-catenary interaction

Zhang,

Xu,

et al. 2024

Acta Mech. Sin.

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Analysis of unsteady flow field and near-field aerodynamic noise of scale high-speed trains in long tunnel

Cited by 5 publications

References 24 publications

Numerical simulation and prediction of aerodynamic noise of high-speed trains

Numerical simulation and prediction of aerodynamic noise of high-speed trains

Flow-Induced Vibration Hybrid Modeling Method and Dynamic Characteristics of U-Section Rubber Outer Windshield System of High-Speed Trains

Effect of coupled vibration modes of dual-strip pan head on pantograph-catenary interaction

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