证明无罪
发表于 2025-3-23 09:55:21
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厚颜无耻
发表于 2025-3-23 17:42:51
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密码
发表于 2025-3-23 18:49:11
Sound Insulation in Buildings,ilings, walls, doors and windows is important. Second, a sufficient structure-borne sound insulation, also called impact sound insulation, for the ceilings, has to be provided especially. Finally, the service equipment should be sufficiently quiet.
收藏品
发表于 2025-3-24 00:12:31
Silencers, cooling towers (Fig. 11.1) or flue gas stacks of power plants to protect the neighbourhood from plant noise. Large silencers are also required for ventilation openings of rooms with high internal sound pressure levels, e.g. industrial production halls or subway ventilation ducts.
IRATE
发表于 2025-3-24 05:51:26
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debouch
发表于 2025-3-24 08:03:20
Noise and Vibration from Railroad Traffic, population towards noise, especially road traffic noise. This sensitivity has constantly increased since then and has significantly influenced the legislation concerning traffic noise. Today, in Germany all construction plans for traffic routes must also include an ensured prediction of the effect of noise on the residents.
半圆凿
发表于 2025-3-24 12:57:39
Ghulam Murtaza,William G. CottsSound consists in mechanical vibrations within the frequency band of human hearing from approximately 16 Hz–16 kHz. Vibrations in air and in liquids are called airborne and liquid-borne sound respectively, vibrations in solids are called structure-borne sound.
obsession
发表于 2025-3-24 15:55:24
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Strength
发表于 2025-3-24 19:19:03
https://doi.org/10.1057/978-1-137-53660-0In noise and vibration control, the most important tasks are the minimization of the excitation and of the propagation of sound in structures. Furthermore, the transfer from structure-borne sound into airborne sound – the vibration-induced radiation of sound – should be kept as low as possible.
Malaise
发表于 2025-3-25 00:21:34
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