title: Modal parameters of two incomplete and complete guitars differing in the bracing pattern of the soundboard.
abstract: Similarities and differences in vibrational behavior of two guitars having a symmetric Torres bracing pattern and an asymmetric pattern forming a lattice on a soundboard are investigated by means of the modal analysis technique and laser Doppler vibrometry (LDV) measurements. Instruments are investigated before and after a bridge and strings assembling (i.e., they are incomplete or complete). The bracing pattern and the absence/presence of the bridge and strings have some effect on modal frequencies and mode shapes. The bracing pattern does not affect the sequence of at least first three low frequency mode shapes of incomplete/complete instruments but affects their modal frequencies. Depending on frequency, the bridge behaves either as a rigid or a flexible structure.
authors.affiliation: Faculty of String Instruments, Harp, Guitar and Luthiery, I. J. Paderewski Academy of Music, św. Marcin 87, 61-808 Poznań, Poland. afa@amu.edu.pl
authors.forename: Ewa
authors.initials: E
authors.lastname: Skrodzka
authors.forename: Andrzej
authors.initials: A
authors.lastname: Łapa
authors.forename: Bogumił B J
authors.initials: BB
authors.lastname: Linde
authors.forename: Eike
authors.initials: E
authors.lastname: Rosenfeld
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D004301:Doppler Effect; D004548:Elasticity; D004867:Equipment Design; D007834:Lasers; D009038:Motion; D009146:Music; D013016:Sound; D013018:Sound Spectrography; D014732:Vibration