Enclosures

Sometimes enclosing a noisy machine in a separate room or box is more practical and economical than quieting it by altering its design, operation, or component parts. The walls of the enclosure should be massive and airtight to contain the sound. Absorbent lining on the interior surfaces of the enclosure can reduce the reverberant buildup of noise within it. Structural contact between the noise source and the enclosure must be avoided, or the source vibration can be transmitted to the enclosure walls and thus short-circuit the isolation. For maximum effective noise control, all of the techniques illustrated in Figure 6.7.3 must be employed. Figure 6.7.4 shows the design and effectiveness of various enclosure configurations.

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