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Thursday, July 11 • 10:40 - 11:00

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Structure-borne low-frequency noise in buildings is generated by technical equipment such as fans, pumps, compressors that are not well vibration isolation. Well-designed vibration isolation of vibrating sources can effectively reduce the transmission of energy into surrounding structures and acoustically protected spaces. The low-frequency noise even in far enclosed spaces can increase the sound pressure level due to standing waves. The energy of the low-frequency waves can have a negative effect on humans, especially in the immediate vicinity of the sources. The effects of low-frequency noise energy on the residents are manifested as head pressure, irritability, migraine, fatigue, awakening, insomnia, stress, depression. The present paper investigates the conditions for reducing the transmission of structure-borne sound from vibration sources of the technical equipment of buildings into residential areas where this noise was manifested as audible tone components of 36 Hz and 49 Hz with values up to 30 dB higher than the background in the protected rooms. The solution is based on the theoretical knowledge and methodology of the transmission of vibro-sound energy and measurement of vibration in rooms and along the path of transmission, as well as on sound measurements which were also performed. For the sound and vibration measurements the FFT analysis was used. The transmission loss of building technical equipment isolators was measured and the results were compared with theory. Finally, this paper suggests some effective measures which can have impact on the reduction of the unwanted vibro-sound energy and on the health of the people and environment.


Lars Håkansson

professor, Linnaeus University


Thursday July 11, 2019 10:40 - 11:00 EDT
Westmount 2
  T01 Ac. meas. & instrum., RS04 Instr fr snd & vibr measur & anl