Such vibrations can cause sound to "radiate" from completely different places than where they arise. They distinguish between what they call "air sound," which is what we experience when we're listening to somebody talking or moving about in another room, and "structural sound," which is propagated in the form of vibrations through floors and walls. Truls Gjestland and Anders Homb at SINTEF know most of what there is to know about sound and the way it propagates in buildings. The study was also designed to investigate what methods could be recommended to satisfy the noise level requirements. He wanted to investigate what noise levels were acceptable, both to the patients and not least to hospital employees who will have to spend three years in the middle of the project. So last autumn, before inviting tenders, he contacted acoustics researchers at SINTEF. Olsen, Nordland Hospital's Development Manager, realised that the renovation work might present a problem and that he had to take the bull by the horns. The plan is to carry out the work while the patients are in their rooms - by renovating half the block at a time, and by moving the patients from one half of the building to the other. The work will include the renovation of a ten- story concrete tower block. Nordland Hospital in Bodø is about to begin a major expansion similar to that recently completed at St. Even if you are some distance from the work site, the sound and vibrations are propagated in such a way that it feels as if they are going on right above - and sometimes even inside - your head. Anybody who has been in a building where construction work is going on knows how the sound of hammer drills and diamond saws can get on one's nerves.
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