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1.发明申请公开(公告)号：US20190161200A1
公开(公告)日：2019-05-30
申请号：US16260972
申请日：2019-01-29
发明人： Marc VERSAEVEL , Denis RAMAGE , Baptiste CORDIER , Georges RIOU , Jacky MARDJONO
摘要： An acoustic attenuation panel for a propulsion unit including a nacelle and a turbojet engine includes a cellular core disposed between an inner skin and an outer skin, called acoustic skin, the acoustic skin including a plurality of acoustic apertures, the acoustic apertures being inclined, at a non-zero inclination angle (β) relative to the direction normal to the acoustic skin, upstream with respect to the flow direction of the air or gas flow to which the panel is intended to be subjected under normal operating conditions, that is to say upstream of the propulsion unit when the panel is mounted in such a unit.
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公开(公告)号：US20190017439A1
公开(公告)日：2019-01-17
申请号：US16025582
申请日：2018-07-02
发明人： Georges RIOU , Jacky Mardjono , Norman Jodet , Jeremy Gonzalez
CPC分类号： F02C7/045 , B64D33/02 , B64D2033/0206 , F01D9/041 , F04D29/542 , F04D29/665 , F05D2220/36 , F05D2260/962 , F05D2260/963
摘要： A turbomachine vane includes an electroacoustic source including two membranes fixed on a support arranged such that the membranes and the support delimit a first cavity. The membranes are arranged on two opposite sides of the first cavity between the two aerodynamic surfaces of the vane. A first of the aerodynamic surfaces includes a first region arranged facing a first of the membranes for the passage of acoustic waves. The membranes and membrane vibration device are configured such that the membranes vibrate in phase opposition and along a same emission direction by applying forces to the support such that the resultant force is approximately zero. The mechanical energy lost in the form of vane deformations due to membrane vibrations can thus be minimized.
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