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studies. Acoustic properties of the rotorcraft noise sources are defined by two sets of sound选择语言:从 到 翻译结果1翻译结果2 翻译结果3翻译结果4翻译结果5 翻译结果1复制译文编辑译文朗读译文返回顶部 研究。旋翼机的噪声源的声学特性是指由两套声音 翻译结果2复制译文编辑译文朗读译文返回顶部 翻译结果3...
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They measure the acoustic energy or audible sounds produced by a variety of sources within a passing vehicle.Sound energy increases when a vehicle enters the detection zone and decreases when it leaves. A 被动音响探测器可能查出容量、速度、居住和分类。 他们在一辆通过的车之内测量各种各样的来源或可...
英标原版标准BS EN ISO 3747-2000 Acoustics. Determination of sound power levels of noise sources using sound pressure. Comparison method in situ.pdf,EUROPEAN STANDARD EN ISO 3747 NORME EUROPÉENNE EUROPÄISCHE NORM July 2000 ICS 17.140.01 English vers
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The reception plate method is simpler and less precise and therefore yields an engineering grade of accuracy. This paper reports on a collaborative investigation, between Boeing BCA and the University of Liverpool, towards developing an industrial standard in source characterization using the reception ...
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Such disturbances may be induced by variations in the sound speed, relative changes in the position of the scatters, and/or position of the sources [2,3,4], among others. In structural concrete, several studies have shown that the CWI technique can be used to monitor sound speed changes ...
Acoustic energy harvesting (AEH) or the sound EH (SEH) process is a new technological advancement which is being investigated due to the abundance of clean sound waves. The majority of sound waves are semi-permanent and can become a significant alternative source of energy for IoT-based wireless...