Method for building closed cavity noise test platform based on direct sound field

The invention discloses a method for constructing a closed cavity noise reduction test platform based on a direct sound field, and belongs to the field of spaceflight sound vibration testing. The invention aims to solve the problems that an existing test method is long in test period, high in cost,...

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Hauptverfasser: CHENG XIUYAN, RONG JILI, ZHANG BOHAN, FAN BOCHAO
Format: Patent
Sprache:chi ; eng
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Beschreibung
Zusammenfassung:The invention discloses a method for constructing a closed cavity noise reduction test platform based on a direct sound field, and belongs to the field of spaceflight sound vibration testing. The invention aims to solve the problems that an existing test method is long in test period, high in cost, high in requirement for a building site and incapable of meeting the test requirement of a large test piece. The method comprises the following steps of: establishing a direct sound field finite element model containing a closed cavity test piece, and replacing complete modeling of a loudspeaker sound source through an equivalent sound source method so as to improve calculation efficiency; and selecting reasonable factors such as a loudspeaker array number, test environment and test piece placement area through a simulation means, and guiding the construction of the direct sound field test platform according to a simulation result, so as to perform the noise test of the closed cavity. According to the method, the n