Engineering topics

Powell, J. G.

Publications and source records attributed to Powell, J. G..

4 records

NASA NTRS1971

Tone-burst technique measures high-intensity sound absorption

Tone-burst technique, in which narrow-bandwidth, short-duration sonic pulse is propagated down a standing-wave tube, measures sound absorbing capacity of materials used in jet engine noise abatement. Technique eliminates effects of tube losses and yields normal-incidence absorption coefficient of specimen.

Powell, J. G.↗

NASA NTRS1971

Techniques for evaluating the sound absorption of materials at high intensities

Shock tube procedure and tone-bust technique for evaluating sound absorption of materials at high intensities

Powell, J. G.↗

NASA NTRS1970

A tone-burst technique of sound-absorption measurement

Normal incidence sound absorption coefficient by propagating narrow bandwidth sinusoidal pulse and measuring amplitude before and after reflection

Powell, J. G.↗

NASA NTRS1968

Flight prototype electrostatic ballastic pendulum Final report

Flight prototype electrostatic ballistic pendulum momentum transducer

Powell, J. G.↗