10.1 INTRODUCTION

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We will present some case studies illustrating the application of noise control

procedures that have been discussed in the previous chapters of this

book. Additional case studies may be found in the literature (Beranek, 1960;

Salmon et al., 1975; Faulkner, 1976).

The case studies include a statement of the noise problem and a

description of the acoustic measures taken to solve the problem. The measurements

taken before the noise control procedures were applied generally

indicate that the noise levels were in violation of some acoustic criterion—in

many cases the Occupation Safety and Health Administration (OSHA) criterion.

A short analysis is presented to identify the primary sources of noise

causing the problem. Some noise control procedures are suggested, and the

degree of noise reduction achieved by the application of these procedures is

described. In most cases, the cost of the application of the noise control

procedures is important. Finally, some of the pitfalls or potential problems

to avoid when attempting to reduce the noise level are noted.

The specific noise control procedures illustrated by the case studies are

as follows:

1. Acoustic barriers—folding carton packing station with an airhammer

noise source

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2. Equipment enclosure—metal cut-off saw noise

3. Operator enclosure—paper machine wet end

4. Sound absorption material—air scrap handling duct

5. Silencer—air-operated hoist motor

6. Vibration isolation—blanking press

7. Acoustic wall treatment—small meeting room.

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