Low Frequency Force to Sound Pressure Transfer Function Measurements Using a Modified Tapping Machine on a Light Weight Wooden Joinst Floor
2016 (English)In: Proceedings of WCTE, World Conference on timber Engineering, August 22-25, 2016, Vienna, Austria, WCTE , 2016Conference paper (Other academic)
In recent years research has shown that low frequency impact sound is of significant importance for inhabitants´ perception of impact sound in buildings with light weight wooden joist floors. The tapping machine is well defined as an excitation device and is a standard tool for building acoustics. However, the excitation force spectrum generated for each individual floor is unknown when using a tapping machine. In order to increase the possibilities to compare simulations to impact sound measurements, there is a need for improvement of impact sound measurement methods. By measuring the input force spectrum by a modified tapping machine and the sound in the receiver room, transfer functions can be achieved.In the light weight wooden building used for the evaluation test of the proposed method, structural nonlinearities are evident in the frequency response functions stemming from different excitation levels. This implies that for accurate FRF-measurements in low frequencies, excitation magnitudes that are similar to these stemming from human excitations should preferably be used.
Place, publisher, year, edition, pages
WCTE , 2016.
Low-frequency impact sound, light weight wooden joist floor, tapping machine, frequency response functions
Research subject Technology (byts ev till Engineering), Mechanical Engineering
IdentifiersURN: urn:nbn:se:lnu:diva-57424OAI: oai:DiVA.org:lnu-57424DiVA: diva2:1037595
WCTE, World Conference on timber Engineering, August 22-25, 2016, Vienna, Austria