Low Frequency Noise and Vibration and its Control. Tokyo 21-23 October 2008.

摘要

Low Frequency Noise and Vibration and its Control. Tokyo 21-23 Octobern2008.nThis thirteenth International Conference on Low frequency Noise and Vibration andnits Control, attracted 64 delegates from around the world. More than half were fromnJapan and seven from Korea and Taiwan. Twelve were from Europe, four from thenUSA, two from Australia - New Zealand and one from India. In all, fourteenncountries were represented at the conference. This is an excellent and varied turn outnin this specialist area. Once again, the international low frequency noise networknmet together, welcomed new members, and listened to 37 interesting papers on allnareas of low frequency noise and vibration.nShinji Yamada, Chairman of the Organising Committee opened the conferencenwith a welcome to delegates, followed by Geoff Leventhall, who gave a review ofn“Low Frequency Noise. What we know, what we do not know, and what wenwould like to know” He reviewed the perception of low frequency noise (LFN) andnthe responses of people to LFN. Sometimes, when there are complaints of LFN andnits effects, a specific noise cannot be measured. The possibilities were considerednfor development of enhanced sensitivity, for alternative (non aural) receptors at verynlow frequencies and for false perceptions. The way in which we measure LFN mayncontribute to the problems.nSaiji Fukade described work on characteristics of infrasound radiated from thencontinuous short spans bridge due to running trucks. Generally, running trucksnin Japan have a tire spring vibration of 10-20 Hz, which induces bending vibrationsnin continuous short span highway bridges. The radiated energy leads to rattle innnearby houses. It was shown that the mode of transmission was both groundnvibration and infrasound. Reduction was obtained by extending the deck to moventhe expansion joint to the approach embankment, leading to up to 10dB reductionnof the worst affected areas.