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

Abstract

The invention discloses a fast prediction method for the aerodynamic noise of the pantograph model of a high-speed train in an acoustic wind tunnel, which comprises the following steps: S1. Establishing a theoretical model of far-field noise radiated by a single cylindrical rod under the condition of free flow, and combining the pantograph model of the pantograph The bow is used as a lever combination of different incoming flow angles and observation angles to obtain the amplitude coefficient, and the theoretical model of aerodynamic noise prediction of the entire pantograph is obtained through the far-field noise theoretical model and the amplitude coefficient; S2. Calculate the aerodynamic noise spectrum of the pantograph , substituting the aerodynamic noise spectrum of the pantograph into the theoretical model of aerodynamic noise prediction of the pantograph and cooperating with the experimental database to obtain the coefficients of the theoretical model of aerodynamic noise prediction; S3. The coefficients are used to correct the results to obtain the final pantograph far-field noise prediction results. A series of correction methods proposed by the invention can be fully or partially applied to the correction of wind tunnel test data of the pantograph and its components.

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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