Acquisition test bench of external aerodynamic noise of high speed train

Abstract

The invention relates to the field of noise control of high speed trains, in particular to an acquisition test bench of external aerodynamic noise of a high speed train. The test bench comprises a test bench support which is 2m in length and is divided into N segments (less than 10 segments). Grooves are arranged around the test bench support. The segments can be connected together by use of groove strip connection pieces. The grooves can be used as slide ways. The test bench also comprises a moving platform vehicle and the test bench support is hinged thereto. A steel wire rope is connected to the upper part of the test bench support. By pulling the steel wire rope, the test bench support can be erected from the horizontal position. The test bench further comprises three layers of framework platforms where microphones and measurement and acquisition devices are installed. Through a lifting device where a fixed pulley is arranged and the grooves of the test bench support are taken as slide ways, the microphones and the like are lifted to the same horizontal position with the high speed train, thereby measuring and acquiring aerodynamic noise. According to the invention, under the condition that all kinds of noise test use standards are met, the test bench is low in manufacturing cost, small in size, and easy to disassemble, assemble and transport; by increasing or decreasing the quantity of the test bench support, the height of the test bench can be increased or reduced; and the test bench is flexible to use.

Description

technical field [0001] The invention relates to the field of high-speed train noise control, in particular to a high-speed train external aerodynamic noise collection test bench. Background technique [0002] High-speed trains refer to railway trains with a maximum speed of 200 kilometers per hour or more, which is now called "high-speed rail". After entering the 21st century, human railway traffic has entered the era of "high-speed rail". Many problems that are reasonably ignored at low speed are becoming more and more obvious, and seriously restrict the increase of train speed. The environmental protection problem in the high-speed railway is the impact of noise. Train noise is mainly composed of traction noise, wheel-rail As the train speed increases, the aerodynamic noise increases rapidly, and will become the main source of high-speed train noise at high speed. [0003] Experimental research is one of the important research methods of high-speed train aerodynamic noise...

AI Technical Summary

Problems solved by technology

Although the wind tunnel test is widely used in the study of aerodynamic noise in the external flow field of high-speed trains, it is a simulation experiment with obvious limitations, mainly including boundary interference, support interference, low Reynolds number, and high cost.

However, the existing field test research is generally carried out along conventional railways, and is not universal. This is because my country’s high-speed railways are generally built on viaducts, and the bridge height can reach 11 meters on the river section, and the non-road passing settlement value is low. The height of the road section is 2 meters, and it is far away from the urban area and the terrain is complex, which makes it very difficult to test aerodynamic noise

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