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Research on Numerical Simulation of Aerodynamic Noise Outside the High-speed Train

Author: HuangSha
Tutor: LiangXiFeng
School: Central South University
Course: Vehicle Operation Engineering
Keywords: High-speed train Aerodynamic noise Sound pressure level Noise Reduction
CLC: U270.16
Type: Master's thesis
Year: 2009
Downloads: 163
Quote: 2
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Abstract


With the increase in speed of the train , railway noise pollution also increased dramatically , excessive noise will seriously affect passengers along the track people's physical , psychological and normal life , but also may cause fatigue damage around the equipment and the surrounding buildings , shorten life and therefore become an important issue to be solved research in high-speed rail development process one high - speed train noise problem . This article is based the Lighthill acoustic theory , using three-dimensional large eddy simulation method of the LES and FW-H acoustic analogy numerical simulation of high-speed trains in different parts of the exterior aerodynamic noise , and noise reduction improvements . The high - speed trains outer aerodynamic noise caused by the fluctuating pressure memory , no significant main frequency , is a broadband noise , aerodynamic noise at the low - frequency part of the energy , the high frequency portion of energy is small , and in a very wide band frequency . With the increase in speed of the train operation , the outside of the vehicle pneumatic noise pressure fluctuations in amplitude and the total sound pressure level increases. The front curve curvature surface fluctuating pressure and pressure gradient affect significantly improve the curved shape , design streamlined front and try to avoid too much change of surface curvature , which can effectively reduce the aerodynamic noise of high-speed train head car . Decreased after the the bogie parts set apron skirt exterior sound pressure level amplitude than the running speed of 200km / h , with an average decrease of 5% ; running speed of 300km / h with an average reduction of about 8% ; appropriate increase in the apron area , the noise reduction effect is more obvious . The vehicle aerodynamic noise increases with increasing groove length and height dimensions of the joints ; settings windshield vehicle joints sound pressure level amplitude decreased , the running speed of 200km / h , an average reduction of 4.0 % ; running speed of 300km / h , an average reduction of about 4.5% ; when the full windshield programs , able to effectively avoid the severe disturbance of the air flow in the groove , further reduce the vehicle joints aerodynamic noise . Above the numerical simulation of the aerodynamic noise of high-speed trains outside research laid the foundation for the design of low-noise high-speed train .

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CLC: > Transportation > Rail transport > Vehicle Engineering > General issues > Vehicle theory and experiment > Vehicle noise and to prevent
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