Assessment of acoustical insulation of double glass building element by laser Doppler vibrometry and microphone measurements
Invited paper
Lab. of Acoustics and Thermal Physics,KU Leuven
Monday 1 june, 2015, 17:20 - 17:40
Auditorium 2 (592)
Abstract:
In many countries, the use of double lightweight separating elements and
structures in new buildings is growing, and the acoustic insulation remains an
important topic of concern, in particular at low frequencies. In this work we
report on laboratory measurements on nine different configurations of double-
layered transparent elements embedded in the opening of a transmission test
facility. The settings differed in the dimensions and shape of the cavity and
on the amount and placement of acoustically absorbing material. Next to the
standardized microphone measurements techniques, scanning laser Doppler
vibrometry measurements were used to obtain a better understanding of the
physical phenomena. The frequency dependent deflection shapes that were
measured with the scanning laser Doppler vibrometer were allowed to determine
to the acoustical insulation spectrum, which was compared with the one
determined by classical, microphone based transmission measurements.