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1. 发明授权

US5684251A Portable acoustic impedance data acquisition and analysis system 失效
标题翻译：便携式声阻抗数据采集与分析系统
公开(公告)号：US5684251A
公开(公告)日：1997-11-04
申请号：US412387
申请日：1995-03-28
申请人： Noe Arcas , Charles A. Parente , Shepard G. Kay
发明人： Noe Arcas , Charles A. Parente , Shepard G. Kay
IPC分类号： G01N29/00 , G01N29/09 , G01N29/04
CPC分类号： G01N29/09 , G01N2291/02491 , G01N2291/02836 , G01N2291/02863 , G01N2291/02872 , G01N2291/2694
摘要： A portable two microphone acoustic impedance data acquisition and analysis system provided in a lightweight, fully portable, battery powered instrument with a dual capability of either on-site or remote-site analysis of measured data on the acoustic impedance of acoustically absorbing duct liners of aircraft jet engines. The fully portable instrument is capable of being operated by relatively unskilled personnel to provide acoustic impedance and non-linearity measurements on acoustic liners at airports and aircraft maintenance facilities. The measured data on the engine duct acoustic liner can be an input directly to the data analysis system at the data acquisition site for on-site analysis, or can be recorded for input to a data analysis system at a later time, or can be recorded and transmitted, such as by a telephone modem, to a data analysis system at a remote-site. The remote-site analysis of data eliminates the requirement for skilled personnel at the aircraft to perform the relatively complex data analysis procedures.
摘要翻译：便携式双麦克风声阻抗数据采集和分析系统，提供在轻型，完全便携式，电池供电的仪器中，具有双重功能，可对现场或远程现场分析航空器吸声管道衬垫的声阻抗测量数据喷气发动机。完全便携式仪器能够由相对不熟练的人员操作，以在机场和飞机维修设施的声学衬垫上提供声学阻抗和非线性测量。发动机管道声衬垫上的测量数据可以直接输入到数据采集现场分析系统的数据分析系统进行现场分析，也可以在以后记录下来输入数据分析系统，或者可以记录并且例如通过电话调制解调器发送到远程站点处的数据分析系统。数据的远程现场分析消除了对飞行员熟练人员执行相对复杂的数据分析程序的要求。

2. 发明授权

US5377546A Multi-degree linear liner impedance testing device 失效
标题翻译：多级线性线性阻抗测试装置
公开(公告)号：US5377546A
公开(公告)日：1995-01-03
申请号：US827606
申请日：1992-01-29
申请人： Noe Arcas , Shepard G. Kay , Charles A. Parente
发明人： Noe Arcas , Shepard G. Kay , Charles A. Parente
IPC分类号： G01H15/00 , G01N29/11 , G01N29/22 , G01N29/00
CPC分类号： G01H15/00 , G01N29/11 , G01N29/223 , G01N2291/02441 , G01N2291/045
摘要： A device for permitting evaluation of the acoustic impedance of liner designs used to attenuate noise in engine aircraft inlet and exhaust ducts, and in particular multiple degree of freedom designs of the type which include a porous facesheet followed by a backing depth followed by successive facesheet/backing depth combinations, includes a plurality of spacers of different thicknesses for varying the backing depths, and a movable plunger with a threaded adjustment mechanism for establishing the final backing depth. Gaskets and seals are installed at various interfaces to eliminate noise leakage paths. Two attachment bolts are used to hold the plunger assembly, face sheets, and spacers together, and an alignment disc positioned on the first facesheet is used to properly align an impedance tube waveguide on facesheet.
摘要翻译：一种用于允许评估用于衰减发动机飞机入口和排气管道中的噪声的衬套设计的声阻抗的装置，并且特别是包括多孔面板，随后是背衬深度，随后是连续的面板/ 背衬深度组合包括多个用于改变背衬深度的不同厚度的间隔物，以及具有用于建立最终背衬深度的螺纹调节机构的可移动柱塞。垫圈和密封件安装在各种接口处，以消除噪声泄漏路径。使用两个连接螺栓来将柱塞组件，面板和间隔件保持在一起，并且使用位于第一面板上的对准盘来将阻抗管波导适当地对准在面板上。

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