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气动噪音是列车沿高速铁路线行进所产生的线路噪音的主要来源,降低这种噪音已显得十分必要。为此,已开发出一种特殊多孔材料,以覆盖物体表面降低气动噪音。为了证实其降低气动噪音的效果,采用圆柱和高速受电弓进行风洞试验,并对其所产生的噪音进行测定。结果显示:应用多孔材料大大降低了圆柱和高速受电弓所产生的噪音,证实了应用多孔材料覆盖物体表面的新方法对于降低气动噪音是有效的。
Pneumatic noise is the main source of line noise generated when trains travel along the high-speed railway line. It has become necessary to reduce this noise. To this end, a special porous material has been developed to cover the surface of an object to reduce aerodynamic noise. In order to confirm its effect of reducing aerodynamic noise, wind tunnel tests were carried out with a cylinder and a high-speed pantograph, and the noise generated therefrom was measured. The results show that the use of porous materials greatly reduces the noise generated by the pillars and the high-speed pantograph. It is proved that the new method of covering the surface of the object with the porous material is effective for reducing the aerodynamic noise.