Rapid prediction method for aerodynamic noise of high-speed train pantograph model in acoustic wind tunnel

Abstract

The invention discloses a rapid prediction method for aerodynamic noise of a high-speed train pantograph model in an acoustic wind tunnel, and the method comprises the following steps: S1, building a far-field noise theoretical model of a single cylindrical rod piece radiated under a free incoming flow condition, taking a pantograph as a lever combination of different incoming flow angles and observation angles, obtaining an amplitude coefficient, obtaining an aerodynamic noise prediction theoretical model of the whole pantograph through the far-field noise theoretical model and the amplitude coefficient; S2, calculating an aerodynamic noise spectrum of the pantograph, substituting the aerodynamic noise spectrum of the pantograph into the aerodynamic noise prediction theoretical model of the pantograph, and obtaining various coefficients of the aerodynamic noise prediction theoretical model in cooperation with the experimental database; and S3, performing result correction on each coefficient of the aerodynamic noise prediction theoretical model of the pantograph to obtain a final pantograph far-field noise prediction result. A series of correction methods provided by the invention can be completely or partially applied to wind tunnel test data correction of the pantograph and components thereof.

Description

technical field [0001] The invention relates to the technical field of aerodynamics, in particular to a fast prediction method for aerodynamic noise of a high-speed train pantograph model in an acoustic wind tunnel. Background technique [0002] With the increase of running speed, the problem of aerodynamic noise of high-speed trains becomes more prominent. An effective understanding of the aerodynamic noise characteristics of high-speed trains is a prerequisite for reducing train noise and improving train operation economy and ride comfort. As the aerodynamic noise generated by the pantograph is the main component of the aerodynamic noise during the operation of the vehicle, it is particularly important to study and evaluate its noise level. Accurate understanding and grasp of pantograph aerodynamic noise mechanism and characteristics is the basis and key to understanding and controlling vehicle noise. [0003] Under current conditions, obtaining the aerodynamic noise of ...

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a fast prediction method for the aerodynamic noise of the high-speed train pantograph model in an acoustic wind tunnel, which solves the problem that it is difficult to obtain accurate and reasonable aerodynamic noise of the pantograph by relying on wind tunnel tests and numerical simulations. question

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