Abstract
Noise reduction of at least 17‐dB A‐weighted sound level was obtained on a multi‐function, dot matrix document printer by incorporation of damping, vibration isolation, and modification of the acoustical paths within the machine. This result was achieved without the use of sophisticated measurement and analysis techniques, but by consideration of basic principles of structural dynamics, application of appropriate materials in conjunction with minor design modifications, and attention to detail. Method of measurement was per ANSI S1.29‐1979, “Method for the Measurement and Designation of Noise Emitted by Computer and Business Equipment.” Emphasis is given to the importance of using highly damped isolation materials which permit large impedance mismatches at structural attachment sites while maintaining integrity of static connections. A discussion of noise sources and treatment approach for each is provided.
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