Rapid prediction method and system for aerodynamic noise of long marshaling train and related components

Abstract

The invention discloses a rapid prediction method for aerodynamic noise of a long marshaling train. The method comprises the following steps: simplifying a long marshaling train into short marshaling trains; according to the obtained surface aerodynamic noise source of each section of train of each short marshaling train, obtaining the surface aerodynamic noise source of each section of train of the long marshaling train in an equivalent mode; according to the equivalent surface aerodynamic noise source of each section of the long marshaling train and the position of a preset far-field observation point, determining aerodynamic noise generated by the surface aerodynamic noise source of each section of the long marshaling train at the far-field observation point; and superposing the determined aerodynamic noise to obtain the aerodynamic noise generated by the long marshaling train at the far-field observation point. By applying the scheme of the invention, the aerodynamic noise of the long marshaling train can be effectively and quickly predicted. The invention further provides a system for rapidly predicting the aerodynamic noise of the long marshaling train and related components, and the system and the related components have the corresponding technical effects.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a fast prediction method, system and related components of the aerodynamic noise of long-formed trains. Background technique [0002] With the increase of train speed, the aerodynamic noise problem of high-speed trains becomes more and more significant, and becomes the main source of train noise at high speed. Research shows that train aerodynamic noise is approximately proportional to the sixth power of train speed, and with the increase of train speed, train aerodynamic noise will increase sharply. Excessive aerodynamic noise will cause sound pollution, affecting the normal life of people along the railway and the comfort of passengers in the train. Therefore, excessive noise has become the main factor limiting the speed of trains. Accurately predicting the aerodynamic noise of high-speed trains is the basis for noise reduction design of trains. [0003] The current aero...

AI Technical Summary

Problems solved by technology

The large eddy simulation method has high requirements on the calculation grid. The large eddy simulation calculation grid of high-speed trains is huge, and the calculation period is very long. With the current calculation conditions, it is usually only possible to carry out large eddy simulation for short-form trains with 2-4 cars. For simulation calculations, it is difficult to perform large eddy simulation calculations for more than 4 cars, especially at present, many long marshalling trains have 8 or 16 cars, which makes the calculation amount of large eddy simulation calculations particularly high

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