Noise Reduction
It is possible to control noise and vibration to reduce adverse effects. Noise and vibration control strategies vary by application, regulation, feasibility, and reasonableness, including consideration of cost and public opinion in some cases. There are many strategies currently available, and others being developed or improved.
Examples of noise control strategies include:
- Constructing a noise wall between a noise source and the receiver of noise, to help block the sound as it propagates.
- Applying sound-absorbing material to a surface to help reduce reflections.
- Reducing the vibration of noise radiating surfaces.
- Relocating the noise source so it is more remote from the receiver.
- Eliminating any gaps or holes in any barrier between the noise source and receiver.
- Constructing tuned resonators to reduce troubling tones resulting from flow noise.
- Alter the speed, frequency, or modulation frequency for the operation of a machine to change the character or sound quality of the noise.
Examples of vibration control strategies include:
- Inserting vibration dampers or vibration isolation mounts between a vibrating source and an adjoining structure.
- Reducing forces generated within a machine that cause vibration.
- Alter the speed, frequency, or modulation frequency for the operation of a machine to avoid exciting resonant frequencies of a structure.
- Applying damping treatments to highly resonant surfaces such as sheet metal panels.
- Applying tuned vibration absorbers to reduce vibration amplitude at resonant frequencies of a structure.
- Stiffening a machine or structure to shift resonant frequencies outside the operating range.
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