Method for testing sound propagation experiments of rail car structures under carload semi-anechoic room environment

Abstract

The invention discloses a method for testing sound propagation experiments of rai car structures under carload semi-anechoic room environment, and belongs to the technical field of acoustic experiments. According to the method, a carload semi-anechoic room which is enough to contain a tested car model is constructed according to an overall dimension of a train; a single carriage of a rail car under a prepared state is put in the carload semi-anechoic room; and structural vibration noises generated to passenger room carriages by bogie noises and transfer paths of the structural vibration noisesare analyzed by utilizing an existing transfer path analysis method for structural vibration noise components. According to the method, influences, on test results, of low-frequency noises in structural sound propagation test site environment are avoided, and a technical acceptance standard for a free field deviation value of the carload semi-anechoic room and optimum position parameters, relative to specific local parts, of noise sampling points in the passenger room carriage are definitely given, so that structural sound propagation experiments can obtain optimum experiment results.

Description

technical field [0001] The invention belongs to the technical field of acoustic testing, is applied to the acoustic research of rail transit vehicles, and in particular relates to a method for testing the sound transmission path of rail vehicle structures under the environment of a semi-anechoic chamber of the entire vehicle. Background technique [0002] The train in the ready state refers to the complete train with all equipment and functions, ready to leave the factory and put into operation. [0003] The measured data on urban rail and high-speed rail vehicles show that when the train in the ready state is running at high speed on the track, the structural vibration noise accounts for a large proportion of the vehicle noise components in the passenger compartment. Structural vibration noise belongs to the low-frequency noise range in the range of 0-1000Hz, which refers to the noise components that propagate in the car body structure in the form of elastic waves caused by...

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Problems solved by technology

[0010] In order to solve the test method of the structural sound transmission path of the existing rail vehicles, the train in the ready state is placed in the workshop or tested on the actual track. In the process, the test results will be affected by the construction in the workshop and the operation of the adjacent track. The influence of the low-frequency vibration generated by the vehicle and the noise of the surrounding environment, and because the structure of the train bogie is very complex, the type and location of the main noise source in the actual operation process are unknown. Therefore, the existing mature structural vibration noise The transmission path analysis method of components is currently unable to be applied in the field of structural vibration noise components generated by bogie noise sources to passenger compartments and their transmission path analysis. The present invention provides a track in a semi-anechoic room environment Test method for vehicle structure sound transmission path test

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