Tutorial

There is a great deal of material on the subject of noise and vibration control. Much of it is esoteric and beyond the range of all but those who are expert in the field. We have chosen to concentrate here on summaries of some of the latest and best information in the field, briefings on regulation and case histories of specific problems and their solutions. Come back often, we'll be adding new documents regularly.

General Noise & Vibration Knowledge
	List of Everyday Sounds & Decibel Levels
How-to Articles
	Four Ways to Quiet a Noisy Machine

Table I show the exposure permitted at specific noise levels.

TABLE I

Permissible Noise Exposures - Duration Per Day (in Hours)	Noise Level in Decibels (d BA)
8	90
6	92
4	95
3	97
2	100
1.5	102
1	105
.5	110
.25	115

Table II indicates the percentage of discernible noise reduction in relation to attained decibel reductions.

TABLE II

Decibel Reduction	Reduction Experience by Ear
2	15%
4	23%
6	38%
8	48%
10	56%
12	63%
14	68%
16	75%
18	77%
20	81%

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