However, this time sound intensity measurements (Li) were used according to the ISO 9614 part 1 (discrete points) and part 2 (scanning). Both techniques where used in the engineering grade. In general a standard deviation of reproducibility of 2 dB may be expected (engineering grade 2). ...
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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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
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...
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Portable sound has progressed drastically from the inception of the headphones in 1891 byErnest Mercadier, the first true headphones in 1910 by engineerNathaniel Baldwinfor the US Navy, from the walkman of the late 1970s, to the iPod generation of the early 2000’s. With the introduction of...
The CWI technique was first introduced by Snieder [1] and consists of using the high sensitivity of multiple scattered waves (over 100 kHz for concrete) to capture small disturbances occurred during their propagation time. Such disturbances may be induced by variations in the sound speed, relative...
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...