title: Horns as particle velocity amplifiers.
abstract: Preliminary measurements and numerical predictions reveal that simple, and relatively small, horns generate remarkable amplification of acoustic particle velocity. For example, below 2 kHz, a 2.5 cm conical horn has a uniform velocity amplification ratio (throat-to-mouth) factor of approximately 3, or, in terms of a decibel level, 9.5 dB. It is shown that the velocity amplification factor depends on the horn's mouth-to-throat ratio as well as, though to a lesser degree, the horn's flare rate. A double horn configuration provides limited additional gain, approximately an increase of up to 25%.
authors.affiliation: Stevens Institute of Technology, Hoboken, New Jersey 07030, USA. ddonskoy@stevens.edu
authors.forename: Dimitri M
authors.initials: DM
authors.lastname: Donskoy
authors.forename: Benjamin A
authors.initials: BA
authors.lastname: Cray
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D000669:Amplifiers, Electronic; D003198:Computer Simulation; D004867:Equipment Design; D008962:Models, Theoretical; D009038:Motion; D009716:Numerical Analysis, Computer-Assisted; D011312:Pressure; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013997:Time Factors