title: On the measurement of airborne, angular-dependent sound transmission through supercritical bars.
abstract: The coincidence effect is manifested by maximal sound transmission at angles at which trace wave number matching occurs. Coincidence effect theory is well-defined for unbounded thin plates using plane-wave excitation. However, experimental results for finite bars are known to diverge from theory near grazing angles. Prior experimental work has focused on pulse excitation. An experimental setup has been developed to observe coincidence using continuous- wave excitation and phased-array methods. Experimental results with an aluminum bar exhibit maxima at the predicted angles, showing that coincidence is observable using continuous waves. Transmission near grazing angles is seen to diverge from infinite plate theory.
authors.affiliation: Acoustics Research Group, Department of Physics and Astronomy, Brigham Young University, N283 Eyring Science Center, Provo, Utah 84602, USA. mdshaw16@gmail.com
authors.forename: Matthew D
authors.initials: MD
authors.lastname: Shaw
authors.forename: Brian E
authors.initials: BE
authors.lastname: Anderson
mesh_terms: D000388:Air; D000535:Aluminum; D004867:Equipment Design; D005583:Fourier Analysis; D008962:Models, Theoretical; D009038:Motion; D012399:Rotation; D013016:Sound; D014159:Transducers; D014465:Ultrasonics / Q000295:instrumentation
chemical_list: D000535:Aluminum