Journal
CHINESE JOURNAL OF MECHANICAL ENGINEERING
Volume 35, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1186/s10033-022-00705-4
Keywords
High-speed train; Aerodynamic noise; Sound source superposition; Numerical prediction
Categories
Funding
- National Key Research and Development Program of China [2020YFA0710902]
- National Natural Science Foundation of China [12172308]
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In this paper, the unsteady flow and far-field noise of a high-speed train are simulated and analyzed using numerical methods and acoustic models. The study proposes a step-by-step calculation method to predict the noise of high-speed trains and verifies the reliability of numerical calculations through experiments. The research results contribute to a better understanding of the generation mechanism and control methods of high-speed train noise.
In this paper, the unsteady flow around a high-speed train is numerically simulated by detached eddy simulation method (DES), and the far-field noise is predicted using the Ffowcs Williams-Hawkings (FW-H) acoustic model. The reliability of the numerical calculation is verified by wind tunnel experiments. The superposition relationship between the far-field radiated noise of the local aerodynamic noise sources of the high-speed train and the whole noise source is analyzed. Since the aerodynamic noise of high-speed trains is derived from its different components, a stepwise calculation method is proposed to predict the aerodynamic noise of high-speed trains. The results show that the local noise sources of high-speed trains and the whole noise source conform to the principle of sound source energy superposition. Using the head, middle and tail cars of the high-speed train as noise sources, different numerical models are established to obtain the far-field radiated noise of each aerodynamic noise source. The far-field total noise of high-speed trains is predicted using sound source superposition. A step-by-step calculation of each local aerodynamic noise source is used to obtain the superimposed value of the far-field noise. This is consistent with the far-field noise of the whole train model's aerodynamic noise. The averaged sound pressure level of the far-field longitudinal noise measurement points differs by 1.92 dBA. The step-by-step numerical prediction method of aerodynamic noise of high-speed trains can provide a reference for the numerical prediction of aerodynamic noise generated by long marshalling high-speed trains.
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