GB/T 2423.47-2018 Environmental testing—Part 2:Test methods—Test Fg:Acoustic vibration

Scope

The purpose of this part of GB/T 2423 is to provide a test method and guidelines for determining the ability of samples to withstand vibration induced by noise environments with specified sound pressure levels.
Generally, sound vibration tests are not required for environments with sound pressure levels below 120 dB.
Under specified sound test conditions, the mechanical weakness and performance degradation of the test samples are determined, and together with other specifications, their acceptability is evaluated. In some cases, this test method is also used as a method to determine the mechanical strength or fatigue resistance of the test samples.
This part includes two test methods, which describe the sound vibration test and the process of measuring sound pressure levels in noise environments, taking into account the need to measure the vibration response of the test samples. Guidelines for selecting noise environments, frequency spectra, sound pressure levels, and exposure durations are also provided.
The traveling wave tube method is suitable for cases where part or all of the outer surface of the product is subjected to aerodynamic turbulence excitation. These applications include aircraft wall panel assemblies where excitation only exists on one side. The reverberation chamber method is suitable for cases where vibration is applied to the entire outer surface of the equipment through distributed excitation, rather than applying vibration to fixed points using an electric vibration table.

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