Device for measuring sound mode of engine pipeline

Abstract

The invention discloses a device for measuring a sound mode of an engine pipeline. The device comprises an annular body, a bracket and microphones, wherein the annular body is in butt joint with the opening of the engine pipeline; the bracket is arranged on the annular body, extends toward the centering direction of the annular body and can rotate relative to the opening of the engine pipeline; the microphones are sequentially arranged on the bracket along the extension direction of the bracket at intervals and are used for detecting the intensity magnitude of sound wave from the engine pipeline. In the device for measuring the sound mode of the engine pipeline, the microphones are arranged on the bracket at intervals, and the bracket can rotate relative to the opening of the engine pipeline, the intensity magnitude of sound wave of the whole engine pipeline can be detected in all directions; compared with the prior art, the device has a smaller number of microphones, and can adapt to various engine pipelines of different cross sections in a rotating way, thereby increasing the universality.

Description

technical field [0001] The invention relates to the field of pipeline sound mode detection, in particular to an engine pipeline sound mode measurement device. Background technique [0002] In the prior art, the method for measuring the sound mode of an engine pipeline is generally to arrange a microphone in the circumferential direction on the pipe wall near the inlet and outlet of the pipeline. For the internal acoustic modal measurement of the engine, microphones are also arranged on the stator vanes, guide vanes and turbulence control covers. With the above methods, since the microphones need to be arranged in the circumferential direction, the number of microphones arranged is generally large; and after the arrangement, only a certain section mode can be fixedly measured, and when the section shape changes, it needs to be rearranged , poor generality. Moreover, the microphones are arranged in the pipeline to be measured, and each microphone has a certain volume. Direct...

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Problems solved by technology

Using the above methods, since the microphones need to be arranged in a circumferential direction, the number of microphones arranged is generally large; and after the arrangement, only a certain section mode can be fixedly measured, and when the shape of the section changes, it needs to be rearranged , poor versatility

And the microphone is set in the pipeline to be measured, each microphone has a certain volume, directly installed on the pipeline to be measured will change the shape of the pipeline to be measured, thereby changing the acoustic mode of the pipeline to be measured, and then affecting the measurement accuracy

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