Cumulus
发表于 2025-3-28 14:48:42
Integrated and Integrating Sound Absorbers,, pointing out the special low-frequency problem. The following Chaps. 4–9 present an up-to-date overview of different effects and designs of state-of-the-art as well as some novel marketable airborne sound absorbers, focusing on classifying and describing the physical damping mechanisms, which diff
SKIFF
发表于 2025-3-28 21:55:53
Sound Absorbers in Room Acoustics,d consulting engineers and architects to design current state-of-the-art noise control and room acoustic measures. Special emphasis is on damping at low frequencies and using fiber-free absorbers with smooth closed surfaces, innovative tools and devices to solve acute acoustical problems.
needle
发表于 2025-3-29 01:24:08
http://reply.papertrans.cn/16/1597/159617/159617_43.png
透明
发表于 2025-3-29 06:14:55
Silencers in Flow Ducts,rooms (see Chaps. . and .), the amount of . required for a specific . (a) plays an important role particularly in view of low frequencies, because this can directly influence the construction costs of a building. The .. (b) and . (c) of porous/fibrous damping materials can be improved by acousticall
敏捷
发表于 2025-3-29 11:19:11
http://reply.papertrans.cn/16/1597/159617/159617_45.png
GLUE
发表于 2025-3-29 13:36:24
Lecture Notes in Electrical Engineeringunit area is not small but very large compared to the air mass moved with the sound wave according to Eq. (.). Such a mass is only able to react with the sound field if rendered excitable as part of a resonance system.
Flat-Feet
发表于 2025-3-29 17:49:18
https://doi.org/10.1057/9781403946041r than using extremely thin mineral fibers in initially comparatively coarse structures and it originally stems from Russian research by Rschevkin and Terossipjantz (1941), Rschevkin (1959) and Veliszhanina (1951). However, it was thanks to an old Chinese master acoustician, Maa (1975), that . (MPA)
evaculate
发表于 2025-3-29 21:40:47
Value At Risk and Stress Testing,e kHz range (see Figs. 13.38 and 13.39) and passive materials with correspondingly larger depths as “bass traps” e.g. in music studios or class rooms for frequencies down to far below 100 Hz, (see Everest, The master handbook of acoustics, 1994) or Sect. 10.3.
nocturia
发表于 2025-3-29 23:58:15
Finance and Capital Markets Seriesder to give the driver the sound that fits the respective power chosen: softly purring like a kitten or roaring like a lion. These technically and physically challenging developments however call for sophisticated testing facilities to minimize noise emissions and optimize internal noises.”
衰老
发表于 2025-3-30 04:17:33
http://reply.papertrans.cn/16/1597/159617/159617_50.png