Method for optimizing low pneumatic noise of high-speed train head section longitudinal symmetry plane line

Abstract

The invention relates to a method for optimizing low aerodynamic noise of molded lines of longitudinal symmetrical surface for the head part of a high-speed train. The molded lines of the longitudinal symmetrical surface for the head part of the high-speed train are basic molded lines for determining the running trend of the whole appearance, wherein the part of the molded line between nose cone points A and transition points B from the train head to the train body is the key part in the molded line design. The invention is the optimized design of the part. The method performs the parameterized model and CFD value calculation on the molded lines of longitudinal symmetrical surface for the head part of a high-speed train by utilizing the NURBS curves, combines the optimized arithmetic to link the change in the aerodynamic performance of the molded line and the adjustment of the geometrical shape, and adjusts the molded lines repeatedly through a flow field computation program and an optimized program, thereby accurately determining the optimal position of the value point of the molded lines of the longitudinal symmetrical surface so that the aerodynamic noise of the head part of the train is reduced to the minimum, lowering the design and the manufacture costs of the aerodynamic noise control of the high-speed train, accelerating the production process of the high-speed train, and making the noise control of the train more scientific.

Description

Technical field [0001] The invention relates to a method for reducing the aerodynamic noise of the head of a railway vehicle, in particular to a method for reducing the aerodynamic noise of the head of a high-speed train by optimizing the design of the longitudinal symmetry surface profile. Background technique [0002] When the train is running at high speed, the body and the parts where the shape changes drastically will produce a complex separation flow. The vortex and turbulence in the flow interact to produce a strong air pulsating pressure field, the pulsating pressure field outside the car and its induced Aerodynamic noise outside the train is the direct cause of train aerodynamic noise. Research shows that: aerodynamic noise is approximately proportional to the 6th power of operating speed. When the vehicle speed is higher than 200km / h, aerodynamic noise has become one of the main noise sources of trains. Therefore, research and reduction of aerodynamic noise have become ...

AI Technical Summary

Problems solved by technology

[0004] Although a large number of research experiments have been carried out, the quantitative relationship between the car body structure and aerodynamic noise is still not clear. According to people's current experience, adopting a streamlined car body structure and reducing the unevenness and angular steps on the vehicle surface can Reduce aerodynamic noise, but only at the stage of qualitative understanding

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