Acoustic frictional resistance construction and method of produc

Details Acoustic frictional resistance construction and method of produc Acoustic frictional resistance construction and method of produc

1984-08-28

1987-02-03

Fuller, Benjamin R.

Acoustics

Sound-modifying means

181158, 219121LK, 219121LL, 219121LU, 219121LY, 381 91, 381 97, 381155, 381158, G10K 1100, B23K 900

Patent

active

046403825

ABSTRACT:
Acoustic frictional resistance comprises a plate having at least one laser-formed hole therethrough. The plate is formed by positioning a plate preferably one having a thickness smaller than one and one-half milimeters alongside a laser and directing the laser beam so that it cuts a hole through the plate. During the process of producing the resistance, the value of the acoustic friction is measured as a pressure drop of a constant air stream or as an expenditure of electrical energy for an electrically excited electroacoustic transducer. This measurement is then used as a variable or as a standard for controlling the process. Advantageously, a coherent beam is emitted by the laser which is deflected by mirror from a horizontal to a vertical direction and focused by means of a lens to work in a contact-free manner on a workpiece supported on a support member such as a movable table. By moving the table in two coordinate directions, a plurality of bores are formed in a pattern in a workpiece. The workpiece may comprise a plate which may be rectangular, circular, annular, etc.

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"Acoustical Engineering", Acoustical Elements, H. F. Olson, D. Van Nostrand Co., Inc., p. 89, 1957.
"Laser & Elektro-Optik", Glas-und Kunstst Offbearbeitung mit Laser CO.sub.2 -Laser Beam Machining of Plastics and Glass, R. J. Saunders, No. 2, 1975.

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