Pipeline high-order acoustic mode generation device and control method

Abstract

The invention relates to a pipeline high-order acoustic modal generation device and a control method, the device comprises a modal excitation pipeline and a measurement pipeline, a plurality of annular loudspeaker arrays are arranged along the axial direction of the modal excitation pipeline, and each annular loudspeaker array comprises a plurality of loudspeakers arranged along the circumferential direction of the modal excitation pipeline; and in the control method, the contribution of each loudspeaker to the acoustic mode is determined according to the installation position of the loudspeaker, an equation set of a sound source and a mode coefficient is constructed, sound source information is obtained through solving, and then the loudspeaker is controlled to produce sound to form a specific acoustic mode. Compared with the prior art, the loudspeakers are arranged in the axial direction and the circumferential direction of the modal excitation pipeline, through the pipeline high-order acoustic modal control method, the circumferential positions and the axial positions of the loudspeakers are considered, excitation of a circumferential modal and a radial modal can be achieved, multiple acoustic modals can be excited and controlled at the same time, the application range is wider, and the obtained target acoustic mode is dominant in the sound field.

Description

technical field [0001] The invention relates to the field of pipeline acoustic mode generation control, in particular to a pipeline high-order acoustic mode generation device and control method. Background technique [0002] Aeroengine noise is the main noise source of the aircraft. In order to effectively control the noise of the aeroengine, it is necessary to first test the noise in the pipeline and analyze its main noise characteristics before implementing the noise reduction measures. The noise of the engine propagates in the pipeline in the form of modes, and a common device for simulating the noise of an aeroengine is a pipeline acoustic mode generator. [0003] The pipe acoustic mode generator is a device that generates a specific spiral sound mode in the pipe by controlling the loudspeaker array installed flush on the outer wall of the pipe, which is used to simulate the noise of the aircraft engine. In the existing research, Seiner, J.M., Reethof, G. published a re...

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Problems solved by technology

Therefore, it is required to produce one or more circumferential modes and radial acoustic modes at the same time, and the existing acoustic mode generators cannot meet the above requirements.

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