Synchronization of organ pipes: experimental observations and modeling

Abel, Markus; Bergweiler, Steffen; Gerhard, Reimund

doi:10.1121/1.2170441

Cited by 36 publications

(25 citation statements)

References 30 publications

(56 reference statements)

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“…The first observation of amplitude death (AD) was made in a system of two organ pipes standing side by side [6]. This problem has recently been revisited by Abel et al [7,8] with a detailed mathematical description. The oscillator system that we aim to stop consists of the acoustic oscillations of a gas column (thermoacoustic oscillations) maintained by heat [9] rather than by the steady gas flow in organ pipes.…”

Section: Introductionmentioning

confidence: 99%

Amplitude Death in Coupled Thermoacoustic Oscillators

2015

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In order to develop a simple method for preventing unwanted thermally driven acoustic gas oscillations, the amplitude-death phenomenon in thermoacoustic oscillators coupled by dissipative and time-delay coupling is experimentally studied. The coupling is designed and built using a needle valve and a halfwavelength tube. Experimental bifurcation diagrams show that oscillations can be completely stopped even in a system comprising identical oscillators when the oscillators are coupled by both dissipative and time-delay coupling. The effectiveness of this type of coupling is confirmed by numerical calculations.

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Section: Introductionmentioning

confidence: 99%

Amplitude Death in Coupled Thermoacoustic Oscillators

2015

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“…3C), the inherent lateral symmetry of each nostril and associated nasal cavities, as well as the fact that effective respiration requires a high synchronisation between the left and right nostrils and the nasal vocal tracts, may explain the apparent singularity of the G0 periodicity. This apparent singularity may also be accentuated by synchronisation phenomena such as that observed between adjacent organ pipes (Abel et al, 2006). …”

Section: An Aerodynamic Whistle?mentioning

confidence: 99%

Evidence of biphonation and source–filter interactions in the bugles of male North American wapiti (Cervus canadensis)

Reby

Wyman

Frey

et al. 2016

Journal of Experimental Biology

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With an average male body mass of 320 kg, the wapiti, Cervus canadensis, is the largest extant species of Old World deer (Cervinae). Despite this large body size, male wapiti produce whistlelike sexual calls called bugles characterised by an extremely high fundamental frequency. Investigations of the biometry and physiology of the male wapiti's relatively large larynx have so far failed to account for the production of such a high fundamental frequency. Our examination of spectrograms of male bugles suggested that the complex harmonic structure is best explained by a dual-source model (biphonation), with one source oscillating at a mean of 145 Hz (F0) and the other oscillating independently at an average of 1426 Hz (G0). A combination of anatomical investigations and acoustical modelling indicated that the F0 of male bugles is consistent with the vocal fold dimensions reported in this species, whereas the secondary, much higher source at G0 is more consistent with an aerodynamic whistle produced as air flows rapidly through a narrow supraglottic constriction. We also report a possible interaction between the higher frequency G0 and vocal tract resonances, as G0 transiently locks onto individual formants as the vocal tract is extended. We speculate that male wapiti have evolved such a dualsource phonation to advertise body size at close range (with a relatively low-frequency F0 providing a dense spectrum to highlight size-related information contained in formants) while simultaneously advertising their presence over greater distances using the very highamplitude G0 whistle component.

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“…fumaroles) whose vibration is induced by the oscillations of the main conduit. Such a phenomenon is knows as ‘modified Mithname effect’ in organ pipe literature (Abel et al 2006; De Lauro et al 2008a). Namely a played pipe is sensitive to the presence of another pipe even silent.…”

Section: Discussionmentioning

confidence: 99%

Decomposition of high-frequency seismic wavefield of the Strombolian-like explosions at Erebus volcano by independent component analysis

Lauro

Martino

Falanga

et al. 2009

Geophysical Journal International

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S U M M A R YThe characteristics of the Strombolian-like activity at Erebus volcano (Antarctica) are evidenced by decomposing the wavefield of the explosion-quakes associated with the bursting of gas slugs at the surface. The decomposition is achieved by adopting a non-linear technique operating in time domain, that is, independent component analysis. Although the spectral properties and polarization analysis of the recorded signals provide evidence of an overall complex volcanic structure, the decomposed waves indicate well-polarized phases with high rectilinearity. Slightly different directions in azimuth can be individuated compatible with different and close vibrating solid structures like conduits in the summit volcanic plumbing system.

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Synchronization of organ pipes: experimental observations and modeling

Cited by 36 publications

References 30 publications

Amplitude Death in Coupled Thermoacoustic Oscillators

Amplitude Death in Coupled Thermoacoustic Oscillators

Evidence of biphonation and source–filter interactions in the bugles of male North American wapiti (Cervus canadensis)

Decomposition of high-frequency seismic wavefield of the Strombolian-like explosions at Erebus volcano by independent component analysis

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