Journal: The Journal of the Acoustical Society of America

Abbreviation

J Acoust Soc Am

Publisher

Acoustical Society of America

Journal Volumes

ISSN

0001-4966
1520-8524

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Publications1 - 10 of 42
  • Acoustic transducer design for active reflection cancellation in a finite volume wave propagation laboratory
    Item type: Other Journal Item
    Willard, Eli; Haberman, Michael R.; van Manen, Dirk-Jan; et al. (2018)
    The Journal of the Acoustical Society of America
  • Diffuse ultrasound monitoring of stress and damage development on a 15-ton concrete beam
    Item type: Journal Article
    Zhang, Yuxiang; Planès, Thomas; Larose, Eric; et al. (2016)
    The Journal of the Acoustical Society of America
    This paper describes the use of an ultrasonic imaging technique (Locadiff) for the Non-Destructive Testing & Evaluation of a concrete structure. By combining coda wave interferometry and a sensitivity kernel for diffuse waves, Locadiff can monitor the elastic and structural properties of a heterogeneous material with a high sensitivity, and can map changes of these properties over time when a perturbation occurs in the bulk of the material. The applicability of the technique to life-size concrete structures is demonstrated through the monitoring of a 15-ton reinforced concrete beam subject to a four-point bending test causing cracking. The experimental results show that Locadiff achieved to (1) detect and locate the cracking zones in the core of the concrete beam at an early stage by mapping the changes in the concrete's micro-structure; (2) monitor the internal stress level in both temporal and spatial domains by mapping the variation in velocity caused by the acousto-elastic effect. The mechanical behavior of the concrete structure is also studied using conventional techniques such as acoustic emission, vibrating wire extensometers, and digital image correlation. The performances of the Locadiff technique in the detection of early stage cracking are assessed and discussed.
  • Acoustofluidic particle dynamics: Beyond the Rayleigh limit
    Item type: Journal Article
    Baasch, Thierry; Dual, Jürg (2018)
    The Journal of the Acoustical Society of America
  • Characterization of interface reflection coefficients using a finite-difference injection technique
    Item type: Journal Article
    Börsing, Nele; Donahue, Carly M.; van Manen, Dirk-Jan; et al. (2017)
    The Journal of the Acoustical Society of America
  • Contactless transport of matter in the first five resonance modes of a line-focused acoustic manipulator
    Item type: Journal Article
    Foresti, Daniele; Nabavi, Majid; Poulikakos, Dimos (2012)
    The Journal of the Acoustical Society of America
  • Response to “Comments on ‘A field study of the exposure-annoyance relationship of military shooting noise’ ” [J. Acoust. Soc. Am. 127, 2301–2311 (2010)] (L)
    Item type: Other Journal Item
    Brink, Mark; Wunderli, Jean-Marc (2012)
    The Journal of the Acoustical Society of America
  • Detection of keyboard vibrations and effects on perceived piano quality
    Item type: Journal Article
    Fontana, Federico; Papetti, Stefano; Järveläinen, Hanna; et al. (2017)
    The Journal of the Acoustical Society of America
    Two experiments were conducted on an upright and a grand piano, both either producing string vibrations or conversely being silent after the initial keypress, while pianists were listening to the feedback from a synthesizer through insulating headphones. In a quality experiment, participants unaware of the silent mode were asked to play freely and then rate the instrument according to a set of attributes and general preference. Participants preferred the vibrating over the silent setup, and preference ratings were associated to auditory attributes of richness and naturalness in the low and middle ranges. Another experiment on the same setup measured the detection of vibrations at the keyboard, while pianists played notes and chords of varying dynamics and duration. Sensitivity to string vibrations was highest in the lowest register and gradually decreased up to note D5. After the percussive transient, the tactile stimuli exhibited spectral peaks of acceleration whose perceptibility was demonstrated by tests conducted in active touch conditions. The two experiments confirm that piano performers perceive vibratory cues of strings mediated by spectral and spatial summations occurring in the Pacinian system in their fingertips, and suggest that such cues play a role in the evaluation of quality of the musical instrument.
  • Modeling three-dimensional elastic wave propagation in circular cylindrical structures using a finite-difference approach
    Item type: Journal Article
    Gsell, Daniel; Leutenegger, Tobias; Dual, Jürg (2004)
    The Journal of the Acoustical Society of America
  • Broadband cloaking and holography with exact boundary conditions
    Item type: Journal Article
    van Manen, Dirk-Jan; Vasmel, Marlies; Greenhalgh, Stewart; et al. (2015)
    The Journal of the Acoustical Society of America
  • Time-resolved modal decomposition based on the Linear Prediction Method-Applied for crack detection
    Item type: Journal Article
    Veres, István A.; Profunser, Dieter M. (2005)
    The Journal of the Acoustical Society of America
    A nondestructive technique for testing and monitoring structures is presented, this uses guided waves to avoid a long scanning process. In contrast to other techniques that use guided waves this method can be applied to any structure made of a material that can be dispersive, strongly attenuating, and anisotropic, without the need of special adaptation. This is demonstrated on beams made of aluminum and wood. The propagating waves are reflected at any acoustic discontinuity, for example, by cracks and defects. In strongly attenuating materials such as wood, it is necessary to work with low frequencies, but due to the correspondingly long wavelength, the incident and reflected (from defects and boundaries) waves superimpose. The presented new signal processing technique allows the determination of the wave modes and their propagation direction very accurately in the time domain. Incident and reflected waves can easily be distinguished by the propagation direction. Since the wave mode is known from signal processing the right group velocity is applied for an accurate calculation of the defect location.
Publications1 - 10 of 42