On the connection between energy velocity, reverberation time and angular momentum

Stanzial, Domenico; Schiffrer, G.

doi:10.1016/j.jsv.2009.10.011

Cited by 6 publications

(10 citation statements)

References 10 publications

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“…This well known picture has recently been enriched by two of the authors of this paper, by attributing, to the power streamlines, 1 the meaning of energy trajectories through the concept of sound energy velocity (see Ref. 2,Sec. 2), and this work will, now, reinterpret the energy flow also from the point of view of the alternating current (AC) circuits.…”

Section: Introductionmentioning

confidence: 91%

“…2 where, in particular, the connection with the boundary absorptions was treated. We recall here the definition of the energy velocity field U(x) given in Ref.…”

Section: The Analog Quantitiesmentioning

confidence: 99%

“…The resulting description is that energy is driven by pressure-velocity sound waves along trajectories, defined by the energy velocity field, which at every point behave like a circuit with a variable conductance (see Ref. 2, Sec. 6) storing a fraction of the total sound power whose amount is determined by the power factor.…”

Section: Introductionmentioning

confidence: 99%

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On the physical meaning of the power factor in acoustics

Stanzial

Sacchi

Schiffrer

2012

The Journal of the Acoustical Society of America

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Following recent advancements in the study of time-averaged properties of energy propagation in linear acoustic fields, the well established concept of power factor known from the electric AC circuits analysis, is here extended to acoustics. This allows our outline of a complete acousto-electro-mechanic analogy, where the fundamental physical concept of energy trajectory is assimilated to a continuous line network of electric circuits, and the complex intensity vector field is defined by means of three special spatial directions: the tangent, the principal normal and the binormal direction at each point of any energy path. The notions of sound energy conductance and susceptance are then introduced and their relationship with complex intensity is highlighted. Finally, the frequency distributions of the defined quantities are measured in different acoustical contexts, thus illustrating their practical utility for advanced intensimetric metrology.

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Section: Introductionmentioning

confidence: 91%

“…2 where, in particular, the connection with the boundary absorptions was treated. We recall here the definition of the energy velocity field U(x) given in Ref.…”

Section: The Analog Quantitiesmentioning

confidence: 99%

See 1 more Smart Citation

On the physical meaning of the power factor in acoustics

Stanzial

Sacchi

Schiffrer

2012

The Journal of the Acoustical Society of America

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“…The study of Franzoni and Bliss [25] has shown that this accuracy can be substantially improved by taking into account the modal coupling. The connection between the mean energy velocity, reverberation time, and angular momentum density has been investigated by Stanzial and Schiffrer [26]. Statistical properties of the active and reactive intensities in reverberant enclosures subjected to pure-tone excitation have been studied by Jacobsen and Molares [27].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of acoustic field in enclosures: Evaluation of active and reactive components of sound intensity

Meissner

2015

Journal of Sound and Vibration

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“…In this kind of application, in fact, the post-processing of intensimetric signals simultaneously sampled at two nearby geometric points belonging to the same hyper-intensimetric measurement point has to be carried out, therefore implying a precision standard for calibrating the twin probes. 9,10 The here-presented methodology has just been developed for doing the fine tuning of p-v sound intensity probes in view of the development of new hyper-intensimetric applications. In this paper anyway, only calibration results referring to one single probe, checked as a part of a system of two Microflown V R match-size probes driven with the same signal conditioner, are reported.…”

Section: Introductionmentioning

confidence: 99%

Calibration of pressure-velocity probes using a progressive plane wave reference field and comparison with nominal calibration filters

Stanzial

Sacchi

Schiffrer

2011

The Journal of the Acoustical Society of America

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A procedure for calibrating pressure-velocity (p-v) sound intensity probes using a progressive plane wave as reference field is presented here. The procedure has been checked for a microelectromechanical system technology-based Microflown(®) match-size probe by comparing the calibration results with the nominal correction curves available from the manufacturer. The reference field was generated along a wave guide by means of a dual cone loudspeaker supplying acoustic energy in the range 20 Hz-20 kHz through an impedance adaptor. Different from the current in-field procedures, the one proposed here allows the calibration of probes under test to be executed at once up to 10 kHz without any change in the experimental setup. After a detailed review of the general principles of calibration, the procedure has been finalized with three main stages: (a) determination of the full coherence calibration bandwidth of the probe, (b) comparison calibration of the probe built-in pressure microphone over the full coherence frequency range, and (c) relative calibration of the velocity sensor over the calibrated pressure one. Calibration results for the probe under test have been best fitted against the calibration filters modeled by the manufacturer and the direct comparison of the obtained data with the factory ones has been reported.

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On the connection between energy velocity, reverberation time and angular momentum

Cited by 6 publications

References 10 publications

On the physical meaning of the power factor in acoustics

On the physical meaning of the power factor in acoustics

Numerical investigation of acoustic field in enclosures: Evaluation of active and reactive components of sound intensity

Calibration of pressure-velocity probes using a progressive plane wave reference field and comparison with nominal calibration filters

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