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- W59035446 abstract "Lightweight building concepts are gaining increasing interest amongst architects, engineers and manufactures due to several advantages. Obviously, lightweight concepts can offer a sustainable solution in several ways. The amount of required resources is smaller compared to traditional concepts and materials can optionally be re-used. Transportation costs and building times are reduced. Adjustment of existing dwelling is more easily adopted to the changing needs. However, an important issue that has to be dealt with is the sound and vibration insulation. Due to increasing comfort expectations of inhabitants and the inability to accurately predict the insulation capabilities, building companies seem be reluctant towards using lightweight concepts. An important parameter used for predicting the sound insulation between rooms is the vibration reduction index Kij [1, 2] describing the insulation properties of a building junction. Models predicting Kij are well established for heavy, monolithic junction. Lightweight juntions generally require more complicated designs involving several transmission paths. Therefore at present the existing models cannot generally be applied to lightweight junctions. Another aspect that plays an important role is low frequency or walking induced vibration. Sound insulators operate in a different frequency range than the vibration frequencies which are induced by walking and vice versa. Therefore both aspects can have a ”competitive relationship”. In this work the sound and vibration characteristics of several lightweight junctions are numerically investigated with FEM (for the lowand the mid-frequency range) and SEA (for the midand the high-frequency range). In order to validate these analyses, the junctions are tested in a laboratory setting. For sound insulation the investigations are focused on obtaining the vibration reduction indicesKij . These are not only investigated for the floor-floor flanking transmission path, but also for all the other possible paths (e.g. floor-wall, floor-ceiling and wall-ceiling). Looking at the vibration behaviour and transmission, the main focus was put on obtaining the One-Step-RMS velocities of the floors. In these investigations the pointand transfermobilities are acquired either by numerical analyses or by measurements. Since these spectra are only required for frequencies up to 40Hz, the numerical study consists merely of FEM analysis. Experimental setup" @default.
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- W59035446 date "2009-01-01" @default.
- W59035446 modified "2023-09-27" @default.
- W59035446 title "Sound and vibration transmission through lightweight junctions: numerical investigation and validation by laboratory tests" @default.
- W59035446 hasPublicationYear "2009" @default.
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