An investigation of the characteristics of impact sound sources for impact sound insulation measurement

Document identifier: oai:DiVA.org:ltu-7785
Access full text here:10.1016/S0003-682X(96)00071-0
Keyword: Engineering and Technology, Mechanical Engineering, Fluid Mechanics and Acoustics, Teknik och teknologier, Maskinteknik, Strömningsmekanik och akustik, Teknisk akustik, Engineering Acoustics
Publication year: 1997
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SDG 9 Industry, innovation and infrastructure
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Abstract:

At the assessment of the impact sound insulation of a construction, a standard tapping machine is used as sound source. However, the current standard tapping machine has been criticised especially for measurement of wooden joist floors since the sounds generated by a tapping machine differ from those generated by actual footfall. This study has investigated the waveform and frequency spectra of human footfall (walking, running and jumping), of sand balls, sand bags and dropped tires, and of the standard tapping machine. It is shown that the frequency spectra differ between the standard tapping machine and actual footfall, especially at low frequencies. Results from other excitation sources such as a sand ball falling from a certain height showed concordance with actual footfall. This means that a sand ball drop as an impact source provides a better representation of actual human footfall than the standard tapping machine.

Authors

Wanqing Shi

Luleå tekniska universitet
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Carin Johansson

Luleå tekniska universitet
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Ulrik Sundbäck

Luleå tekniska universitet
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