![]() ![]() The use of rubber or other resilient mountings will usually reduce both noise and vibration. If heavy machines are firmly bolted to concrete or wood floors, the floors are often transformed into huge sounding boards that not only amplify the noise, but also spread it throughout the building. Since high-frequency noises are more damaging to the ear than those containing low frequencies, and since high frequencies are blocked more easily with massive barriers, isolation is an effective method of noise control.Ī fourth method of noise control is through the use of resilient mountings. High-frequency sound is blocked more easily than a low-frequency one. Frequency is also a factor in transmission loss. The amount of sound stopped by a barrier is known as “transmission loss”. The heavier the wall, the less noise will get through it. For example, a heavy concrete or brick wall will stop more sound than a plywood wall. The effectiveness of an isolating barrier depends on the materials used for the barrier, and the frequency or type of noise being isolated. An example of isolation is placing a particularly noisy operation in a separate room away from other operations, thus exposing only a few people to the noise instead of many.Īn important method of isolating noise is to construct a barrier (or wall) between the source of noise and persons likely to be exposed to it. Isolation is a third method of noise control. ![]() Another method of noise control is substitution.Īn example of substitution is to replace metal table-tops with wooden ones as a working surface for metal parts. are tight so that they will not rattle excessively. An example of this would be to make sure that all bolts, screws, etc. One way to reduce noise is to control it at the source. ![]()
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