Biomedical subjects
Publications and source records attributed to A L Cudworth.
The American Academy of Industrial Hygiene has initiated a program to accredit academic programs in industrial hygiene. Guidelines, criteria, and procedures to be employed by the Accreditation Committee are summarized, along with a status report of activities currently underway.
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Sixty-five commercial pneumatic mufflers in the size range of 1/8 to 3/8-inch American Standard Taper Pipe Thread (NPT) were evaluated for noise level as a function of air supply pressure and back pressure. Also, typical directivity pattern and spectral content were determined. A rating system has been devised, as well as individual prediction formulas, to rank order the mufflers and provide a capability of calculating expected noise levels for a given supply pressure. As this study reveals, noise reductions in excess of 40 dBA may be achieved by employing an efficient pneumatic muffler.
An efficiency rating system is presented to aid in the selection of hand held air guns, nozzles, and ejectors. This guide is based on noise levels, force or thrust, and air supply pressure. In addition, air consumption, blocked static air pressure, noise directivity patterns and spectra are presented. Finally, noise control techniques in the use and installation of nozzles and ejectors are reviewed.
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Explore the source record for details and available documents.
Explore the source record for details and available documents.