Multimicrophone Measurement of Semi-Active Samples in an Acoustic Tube

Materials Science Forum ◽

10.4028/www.scientific.net/msf.919.386 ◽

2018 ◽

Vol 919 ◽

pp. 386-395

Author(s):

Michal Kašpárek ◽

Martin Černík ◽

Jana Urbánková ◽

Pavel Mokrý

Keyword(s):

Acoustic Wave ◽

Piezoelectric Material ◽

Measurement Method ◽

Measurement Methods ◽

Acoustic Properties ◽

Damping Material ◽

Shunt Damping

The sample of a piezoelectric semi-active shunt damping material is analyzed inside an acoustic tube. The measurement of reflected and transmitted acoustic wave through the sample is realized using 4-microphone measurement method. Acoustic properties of the sample with the emphasis on acoustic transmissibility are analyzed. The composite piezoelectric sample comprising of a piezoelectric material connected to a linear shunting circuit is described, also the multimicrophone measurement methods are described in detail and the results are discussed in context of semi-active sound damping.

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Guidelines for the measurement method of nonlinearity for surface acoustic wave (SAW) and bulk acoustic wave (BAW) devices in radio frequency (RF)

10.3403/30254950u ◽

2015 ◽

Keyword(s):

Acoustic Wave ◽

Radio Frequency ◽

Surface Acoustic Wave ◽

Measurement Method ◽

Bulk Acoustic Wave

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Guidelines for the measurement method of nonlinearity for surface acoustic wave (SAW) and bulk acoustic wave (BAW) devices in radio frequency (RF)

10.3403/30254950 ◽

2014 ◽

Keyword(s):

Acoustic Wave ◽

Radio Frequency ◽

Surface Acoustic Wave ◽

Measurement Method ◽

Bulk Acoustic Wave

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Guidelines for the measurement method of power durability for surface acoustic wave (SAW) and bulk acoustic wave (BAW) devices in radio frequency (RF) applications

10.3403/30366384u ◽

2020 ◽

Keyword(s):

Acoustic Wave ◽

Radio Frequency ◽

Surface Acoustic Wave ◽

Measurement Method ◽

Bulk Acoustic Wave ◽

Rf Applications

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Une nouvelle méthode de mesure de la fonction d'aire du conduit vocal : cas des voyelles

Canadian Journal of Physics ◽

10.1139/p05-026 ◽

2005 ◽

Vol 83 (7) ◽

pp. 721-737

Author(s):

H Teffahi ◽

B Guerin ◽

A Djeradi

Keyword(s):

Measurement Method ◽

Cross Correlation ◽

Sound Production ◽

Linear Prediction ◽

Vocal Tract ◽

Random Sequence ◽

Speech Sound ◽

Acoustic Properties ◽

External Excitation ◽

White Noise Excitation

Knowledge of vocal tract area functions is important for the understanding of phenomena occurring during speech production. We present here a new measurement method based on the external excitation of the vocal tract with a known pseudo-random sequence, where the area function is obtained by a linear prediction analysis applied to the cross-correlation between the sequence and the signal measured at the lips. The advantages of this method over methods based on sweep-tones or white noise excitation are (1) a much shorter measurement time (about 100 ms) and (2) the possibility of speech sound production during the measurement. This method has been checked against classical methods through systematic comparisons on a small corpus of vowels. Moreover, it has been verified that simultaneous speech sound production does not perturb significantly the measurements. This method should thus be a very helpful tool for the investigation of the acoustic properties of the vocal tract in various cases for vowels.

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Assessing bias, precision, and agreement in method comparison studies

Statistical Methods in Medical Research ◽

10.1177/0962280219844535 ◽

2019 ◽

Vol 29 (3) ◽

pp. 778-796 ◽

Cited By ~ 1

Author(s):

Patrick Taffé

Keyword(s):

Measurement Method ◽

Method Comparison ◽

Estimation Procedure ◽

Measurement Methods ◽

Repeated Measurements ◽

Confidence Bands ◽

The Other ◽

Reference Standard ◽

Simultaneous Confidence Bands ◽

Index Of Agreement

Recently, a new estimation procedure has been developed to assess bias and precision of a new measurement method, relative to a reference standard. However, the author did not develop confidence bands around the bias and standard deviation curves. Therefore, the goal in this paper is to extend this methodology in several important directions. First, by developing simultaneous confidence bands for the various parameters estimated to allow formal comparisons between different measurement methods. Second, by proposing a new index of agreement. Third, by providing a series of new graphs to help the investigator to assess bias, precision, and agreement between the two measurement methods. The methodology requires repeated measurements on each individual for at least one of the two measurement methods. It works very well to estimate the differential and proportional biases, even with as few as two to three measurements by one of the two methods and only one by the other. The repeated measurements need not come from the reference standard but from either measurement methods. This is a great advantage as it may sometimes be more feasible to gather repeated measurements with the new measurement method.

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Research on Online Measurement Method of Hole Diameter and Position

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.347-350.197 ◽

2013 ◽

Vol 347-350 ◽

pp. 197-200

Author(s):

Yu Gong ◽

Jing Cai Zhang ◽

Hong Qi Liu

Keyword(s):

Comparative Analysis ◽

Measurement System ◽

Measurement Method ◽

Measurement Methods ◽

Hole Diameter ◽

Laser Sensor ◽

Online Measurement ◽

Online Detection ◽

Ccd Imaging ◽

Inductive Sensor

In this paper, research on measurement methods of hole during the parts online detection has been made. Both diameter and position of the hole are going to be detected in the same measurement system. In order to obtain higher accuracy and efficiency, a comparative analysis test of using the contact probes, the inductive sensor, the laser sensor, the forward and back lighting CCD imaging have been achieved. Results show that the contact measurement using inductive sensor is more suitable for the system, for the reason that it has higher reliability and efficiency.

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Cross Calibration by FFT Equalization

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.2801239 ◽

1997 ◽

Vol 119 (2) ◽

pp. 236-242 ◽

Cited By ~ 2

Author(s):

K. Peleg

Keyword(s):

Measurement Method ◽

Functional Relationship ◽

Measurement Methods ◽

New Method ◽

Measurement Systems ◽

True Value ◽

Calibration Problem ◽

Regression Techniques ◽

The Cross ◽

Cross Calibration

The classical calibration problem is primarily concerned with comparing an approximate measurement method with a very precise one. Frequently, both measurement methods are very noisy, so we cannot regard either method as giving the true value of the quantity being measured. Sometimes, it is desired to replace a destructive or slow measurement method, by a noninvasive, faster or less expensive one. The simplest solution is to cross calibrate one measurement method in terms of the other. The common practice is to use regression models, as cross calibration formulas. However, such models do not attempt to discriminate between the clutter and the true functional relationship between the cross calibrated measurement methods. A new approach is proposed, based on minimizing the sum of squares of the differences between the absolute values of the Fast Fourier Transform (FFT) series, derived from the readings of the cross calibrated measurement methods. The line taken is illustrated by cross calibration examples of simulated linear and nonlinear measurement systems, with various levels of additive noise, wherein the new method is compared to the classical regression techniques. It is shown, that the new method can discover better the true functional relationship between two measurement systems, which is occluded by the noise.

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Comparison of three measurement methods of saturated hydraulic condutivity

Hydrology and Earth System Sciences Discussions ◽

10.5194/hessd-3-987-2006 ◽

2006 ◽

Vol 3 (3) ◽

pp. 987-1019 ◽

Cited By ~ 2

Author(s):

C. Fallico ◽

E. Migliari ◽

S. Troisi

Keyword(s):

Hydraulic Conductivity ◽

Measurement Method ◽

Sandy Loam ◽

Measurement Methods ◽

Soil Core ◽

Statistical Parameters ◽

Factors Affecting ◽

Average Value ◽

Constant Head ◽

Log Normal

Abstract. After pointing out the importance of the saturated hydraulic conductivity (ks) measurements and the difficulties and uncertainties that are present, and after recalling salient aspects of three well-known measurement methods of this parameter (i.e. constant-head tension infiltrometer (TI) method, constant-head pressure infiltrometer (PI) method and soil core (SC) estimates method), the results of an investigation on data which were obtained during a measurement campaign on an area of 800 m2, on a sandy loam hillslope, located in Southern Italy, were carried out again here. Three sets of values of ks, obtained with these measurement methods, were analyzed statistically, verifying that the log-normal distribution describes these better than the normal one; moreover, the more significant statistical parameters of each set were compared (average value , amplitude A, coefficient of variation CV and standard deviation SD), individualizing the more significant differences. The greatest value of hydraulic conductivity was found with method (PI), while the smallest with (SC) and the intermediate with (TI); these differences were translated into macroporosity and into the influence of the single measurement method. Moreover, referring to the possible factors affecting the results, the importance can be noted of the structure, the texture and the soil events, in terms of utilization, which can affect the measure of ks leading often to very different values even for similar soils, but with a different history, independently of the coincidence of the measurement points and they can be determining to explain the differences affecting the results obtained in analogous investigations by other researchers. Having confirmed that generalization is not possible, the need was emphasized to adopt the necessary devices relating to the specific measurement method, case by case, and to carefully explain the obtained results, in the light of the peculiarities and the limits of each situation. Finally, the results of similar statistical analysis carried out on a greater number of ks values, measured through the (TI) and (PI) methods are shown in this paper, with some statistical considerations on the increasing of the measurements number.

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Empirical study on the correlation between measurement methods under diffuse and direct sound field conditions for determining sound absorption and airborne sound insulation properties of noise barriers

INTER-NOISE and NOISE-CON Congress and Conference Proceedings ◽

10.3397/in-2021-2383 ◽

2021 ◽

Vol 263 (3) ◽

pp. 3350-3361

Author(s):

Andreas Fuchs ◽

Reinhard Wehr ◽

Marco Conter

Keyword(s):

Empirical Study ◽

Sound Absorption ◽

Sound Field ◽

Research Programme ◽

Measurement Methods ◽

Field Conditions ◽

Acoustic Properties ◽

Sound Insulation ◽

Noise Barriers ◽

Airborne Sound

In the frame of the SOPRANOISE project (funded by CEDR in the Transnational Road Research Programme 2018) the database of the European noise barrier market developed during the QUIESST project was updated with newly acquired data. This database gives the opportunity for an empirical study on the correlation between the different measurement methods for the acoustic properties of noise barriers (according to the EN 1793 series) to further investigate the interrelationships between these methods by using single-number ratings and third-octave band data. First a correlation of the measurement methods for sound absorption under diffuse field conditions (EN 1793-1) and sound reflection under direct sound field conditions (EN 1793-5) is presented. Secondly, a correlation of the measurement methods for airborne sound insulation under diffuse field conditions (EN 1793-2) and airborne sound insulation under direct sound field conditions (EN 1793-6) is shown. While for airborne sound insulation a distinct correlation is found due to the wide data range, for sound absorption no robust correlation can be found.

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