Roughness of organ pipe sound due to frequency comb

Trommer, Thomas; Angster, Judit; Miklós, András

doi:10.1121/1.3651242

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…The dual-peak pattern, observed in both measured and predicted spectra, results from the co-existence of the first and second hydrodynamic modes (H1 and H2). The co-existence of two frequencies was found in flue instruments 61,62 and shallow cavities. 63 In comparison with experiment of Ma et al, the present model gives higher frequencies and amplitudes for H1 and H2 oscillations at this state.…”

Section: A Flow-excited Acoustic Resonancementioning

confidence: 94%

Flow-excited acoustic resonance of a Helmholtz resonator: Discrete vortex model compared to experiments

Dai

Sun

2015

Physics of Fluids

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The acoustic resonance in a Helmholtz resonator excited by a low Mach number grazing flow is studied theoretically. The nonlinear numerical model is established by coupling the vortical motion at the cavity opening with the cavity acoustic mode through an explicit force balancing relation between the two sides of the opening. The vortical motion is modeled in the potential flow framework, in which the oscillating motion of the thin shear layer is described by an array of convected point vortices, and the unsteady vortex shedding is determined by the Kutta condition. The cavity acoustic mode is obtained from the one-dimensional acoustic propagation model, the time-domain equivalent of which is given by means of a broadband time-domain impedance model. The acoustic resistances due to radiation and viscous loss at the opening are also taken into account. The physical processes of the self-excited oscillations, at both resonance and off-resonance states, are simulated directly in the time domain. Results show that the shear layer exhibits a weak flapping motion at the off-resonance state, whereas it rolls up into large-scale vortex cores when resonances occur. Single and dual-vortex patterns are observed corresponding to the first and second hydrodynamic modes. The simulation also reveals different trajectories of the two vortices across the opening when the first and second hydrodynamic modes co-exist. The strong modulation of the shed vorticity by the acoustic feedback at the resonance state is demonstrated. The model overestimates the pressure pulsation amplitude by a factor 2, which is expected to be due to the turbulence of the flow which is not taken into account. The model neglects vortex shedding at the downstream and side edges of the cavity. This will also result in an overestimation of the pulsation amplitude.

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Section: A Flow-excited Acoustic Resonancementioning

confidence: 94%

Flow-excited acoustic resonance of a Helmholtz resonator: Discrete vortex model compared to experiments

Dai

Sun

2015

Physics of Fluids

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“…Research into the phenomenon has been largely experimental, as shown in works [ 10 , 11 ], or presented by organ builders, e.g., Astride Cavaillé-Coll “De la Détermination des Dimensions des Tuyaux par rapport à leur Intonation”, Paris, 23 January 1860 [ 12 ]. Modern-day research into the phenomena occurring in organ pipes focuses mainly on air flow modeling during sound generation, as well as on the experimental testing of simulation results [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ].…”

Section: Voicing and Tempering Of A Pipe Organmentioning

confidence: 99%

Pattern Recognition in Music on the Example of Reconstruction of Chest Organ from Kamień Pomorski

Wrzeciono

2021

Sensors

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The chest organ, which gained popularity at the beginning of the 17th century, is a small pipe organ the size of a large box. Several years ago, while compiling an inventory, a previously unidentified chest organ was discovered at St. John the Baptist’s Co-Cathedral in Kamień Pomorski. Regrettably, the instrument did not possess any of its original pipes. What remained, however, was an image of the front pipes preserved on the chest door. The main issue involved in the reconstruction of a historic instrument is the restoration of its original tuning (temperament). Additionally, it is important to establish the frequency of A4, as this sound serves as a standard pitch reference in instrument tuning. The study presents a new method that aims to address the above-mentioned problems. To this end, techniques to search for the most probable temperament and establish the correct A4 frequency were developed. The solution is based on the modeling of sound generation in flue pipes, as well as statistical analysis to help match a model to the parameters preserved in the chest organ drawing. Additionally, differentalues of the A4 sound values were defined for temperatures ranging from 10 ∘C to 20 ∘C. The tuning system proposed in 1523 by Pietro Aaron proved to be the most probable temperament. In the process of testing the developed flue pipe model, the maximum tuning temperature was established as 15.8 ∘C.

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Investigation of the acoustical characteristics of organ pipes in a performing space

Jeon¹,

Hwang²,

Kim³

2014

Building and Environment

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Roughness of organ pipe sound due to frequency comb

Cited by 3 publications

References 10 publications

Flow-excited acoustic resonance of a Helmholtz resonator: Discrete vortex model compared to experiments

Flow-excited acoustic resonance of a Helmholtz resonator: Discrete vortex model compared to experiments

Pattern Recognition in Music on the Example of Reconstruction of Chest Organ from Kamień Pomorski

Investigation of the acoustical characteristics of organ pipes in a performing space

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