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Test method for sound insulation property of train body panel based on vehicle semi-anechoic room environment

A technology of semi-anechoic chamber and test method, which is applied in the analysis of solids, instruments, and materials using sonic/ultrasonic/infrasonic waves, which can solve the problem of inability to isolate the acoustic environment in a semi-anechoic chamber, avoid external interference and reduce the impact. , the effect of improving the accuracy

Active Publication Date: 2019-03-29
CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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AI Technical Summary

Problems solved by technology

[0017] In order to solve the problem that the existing standing wave tube method and laboratory sound insulation chamber method are usually only aimed at individual car body panel samples, and such individual car body panel samples cannot isolate the semi-anechoic chamber into two completely independent acoustic environment

Method used

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  • Test method for sound insulation property of train body panel based on vehicle semi-anechoic room environment
  • Test method for sound insulation property of train body panel based on vehicle semi-anechoic room environment

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] The method for testing the sound insulation performance of the train car body wall plate based on the environment of the whole vehicle semi-anechoic chamber of the present invention comprises the following steps:

[0038] Step 1: If figure 1 As shown, according to the overall dimensions of the train, a vehicle semi-anechoic chamber 2 that is sufficient to accommodate a single carriage of a rail train in a ready state is built; the cut-off frequency of the vehicle semi-anechoic chamber 2 is not greater than 50 Hz, and its natural frequency is not higher than 3.57Hz, the vibration isolation efficiency for 50Hz excitation frequency is not less than 99%, the background noise is less than 15dB, and the distance between the test sample in the currently selected area and the wall of the semi-anechoic chamber 2 of the vehicle is greater than 5m.

[0039] Step...

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Abstract

The invention discloses a test method for a sound insulation property of a train body panel based on a vehicle semi-anechoic room environment, and belongs to the field of test method for sound insulation property of a rail transit vehicle body panel. The method comprises the following steps of: constructing a vehicle semi-anechoic room sufficient to accommodate the tested vehicle, using the relevant structural subsystems with similar vibration mode groups such as the floor, the roof, the side wall, the door, the window and the windshield of a rail passenger car as the test samples of the currently selected area, thereby respectively taking the samples as test targets, and completing the sound insulation property test on the vehicle body panel. The method does not need to produce special samples for each floor, roof, side wall, door, window and windshield, thereby saving the cost of sample production. The method has no damage to the vehicle itself, and can test all the sound insulationof the area of interest of the vehicle at one time.

Description

technical field [0001] The invention belongs to the field of sound insulation performance measurement methods for rail transit vehicle body panels, in particular to a method for testing the sound insulation performance of train body panels based on the environment of the semi-anechoic chamber of the whole vehicle. Background technique [0002] The acoustic environment inside the rail transit vehicle directly affects the ride comfort of the drivers and passengers, and is a key factor to ensure and even enhance the market competitiveness of the rail transit industry. Existing research results show that the transmission sound formed by the external noise of the vehicle entering the interior of the compartment through the body wall is one of the main sources of noise in the vehicle, and the strength of the transmission sound is closely related to the sound insulation performance of the vehicle body. Selecting an appropriate test method to test the sound insulation performance of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/11
CPCG01N29/11G01N2291/028G01N2291/023G01N2291/015
Inventor 滕万秀吴健高阳刘彦彤张术
Owner CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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