ABSTRACT
Noise control is an applied field. It is much more than the application of formulae or rules of thumb. In complex acoustic environments with multiple sources, multiple paths for sound propagation, and multiple receiver points; the development of an understanding of the sound field can be quite challenging. Most often this understanding requires a series of measurements that may include sound pressure measurements, vibration or acceleration measurements, the collection of operational information for the machines or operations generating noise, and possibly dosimetry data (measurements of the noise exposure of employees). In the simplest terms noise control is most often a combination of experimental and analytical work. This chapter provides a fundamental understanding of the noise control methodology for the basic types of noise control issues. It does note attempt to explain the detailed mechanics of noise sources or noise control methods. There are other texts that provide this sort of information. The goal of this chapter is to provide the foundation in terms of method and concepts that can be used to resolve noise issues. Both structural and airborne noise control are discussed since ultimately all structural noise must become airborne to be heard. In addition, noise control on only the structural transmission components would be incomplete and unsuccessful in resolving most noise issues. This chapter provides a good outline with specific treatment of the best techniques and methods used in a wide array of noise control solutions.
