吸声器性能测量仪器的研制

J. C. Johnston, M. Kuczmarski, Garth Olszko
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引用次数: 2

摘要

在固定翼和旋翼飞机中,向轻量化结构的转变导致了结构振动和内部噪声的增加。多孔材料已被提出作为吸声材料来降低这种噪声。本文讨论了美国宇航局格伦研究中心用于表征多孔材料声学性能的设备的发展:用于测量多孔材料样品压降的流动阻力装置,以及使用一对固定麦克风来测量多孔材料样品法向入射声阻抗的驻波管。特别注意的是使该设备在测试所需的试样尺寸方面尽可能灵活,以适应新材料开发阶段经常产生的小尺寸或不规则尺寸。此外,由于新开发材料的性能未知,流阻仪包含安全特性,以包含在测试过程中脱落颗粒或灾难性失败的测试样品。给出了对飞机玻璃纤维的测量结果,以验证该设备的正确性能。
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Development of Instrumentation for the Measurement of the Performance of Acoustic Absorbers
In both fixed and rotary wing aircraft, the move toward lighter structures has resulted in an increase in structural vibration and interior noise. Porous materials have been proposed as acoustic absorbers to reduce this noise. This paper discusses the development of equipment at the NASA Glenn Research Center for characterizing the acoustic performance of porous materials: a flow resistance apparatus to measure the pressure drop across a specimen of porous material, and a standing wave tube that uses a pair of stationary microphones to measure the normal incidence acoustic impedance of a porous material specimen. Specific attention is paid to making this equipment as flexible as possible in terms of specimen sizes need for testing to accommodate the small or irregular sizes often produced during the development phase of a new material. In addition, due to the unknown performance of newly developed material, safety features are included on the flow resistance apparatus to contain test specimens that shed particles or catastrophically fail during testing. Results of measurements on aircraft fiberglass are presented to verify the correct performance of the equipment.
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