扩大
发表于 2025-3-25 05:26:05
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变形
发表于 2025-3-25 10:14:29
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围巾
发表于 2025-3-25 12:11:13
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Alpha-Cells
发表于 2025-3-25 16:34:08
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裂口
发表于 2025-3-25 21:54:02
Structure-Borne Sound, Insulation and Damping,In 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.
雕镂
发表于 2025-3-26 02:46:12
Sources of Sound,According to Lighthill’s theory, one may distinguish sound sources in a free flow in terms of monopoles, dipoles, and quadrupoles . The volume flow itself is irrelevant for monopole sound generation. It is the variation in time of the volume determined by the fluctuating mass flow, which generates sound.
linear
发表于 2025-3-26 07:42:50
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自传
发表于 2025-3-26 09:40:11
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狼群
发表于 2025-3-26 15:20:28
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OASIS
发表于 2025-3-26 20:32:49
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