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Author: Martin Guski
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832541462
Category : Computers
Languages : en
Pages : 176
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Book Description
Correct and precise measurements of room acoustic parameters are of fundamental importance for subjective room impression characterization and for the physical description of the sound field. This thesis investigates external influences on acoustic measurements and errors of the resulting room acoustic parameters. Theoretical models have been developed to predict these errors and indicate the tolerable limits of the described influences. To validate these models, specially designed room acoustic measurements that separate the individual influence factors have been conducted. Noise has been identified as one of the main influence factors and occurs during every measurement. In this thesis the performance of five commonly used stationary noise compensation methods are systematically analyzed depending on the peak signal-to-noise ratio. Impulsive noise that could also occur during the measurement is investigated separately, as the previously introduced compensation techniques are unsuited to handle the influence. The second part of this thesis analyzes the influence of time variances during measurements. Inter- and intra-measurement temperature changes, air movement, and human-sized scattering objects have been investigated.
Author: Martin Guski
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832541462
Category : Computers
Languages : en
Pages : 176
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Book Description
Correct and precise measurements of room acoustic parameters are of fundamental importance for subjective room impression characterization and for the physical description of the sound field. This thesis investigates external influences on acoustic measurements and errors of the resulting room acoustic parameters. Theoretical models have been developed to predict these errors and indicate the tolerable limits of the described influences. To validate these models, specially designed room acoustic measurements that separate the individual influence factors have been conducted. Noise has been identified as one of the main influence factors and occurs during every measurement. In this thesis the performance of five commonly used stationary noise compensation methods are systematically analyzed depending on the peak signal-to-noise ratio. Impulsive noise that could also occur during the measurement is investigated separately, as the previously introduced compensation techniques are unsuited to handle the influence. The second part of this thesis analyzes the influence of time variances during measurements. Inter- and intra-measurement temperature changes, air movement, and human-sized scattering objects have been investigated.
Author: Claudio Guarnaccia
Publisher: MDPI
ISBN: 3039282840
Category : Science
Languages : en
Pages : 584
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Book Description
Modelling and simulation in acoustics is currently gaining importance. In fact, with the development and improvement of innovative computational techniques and with the growing need for predictive models, an impressive boost has been observed in several research and application areas, such as noise control, indoor acoustics, and industrial applications. This led us to the proposal of a special issue about “Modelling, Simulation and Data Analysis in Acoustical Problems”, as we believe in the importance of these topics in modern acoustics’ studies. In total, 81 papers were submitted and 33 of them were published, with an acceptance rate of 37.5%. According to the number of papers submitted, it can be affirmed that this is a trending topic in the scientific and academic community and this special issue will try to provide a future reference for the research that will be developed in coming years.
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 620
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Book Description
Author: Ingo B. Witew
Publisher: Logos Verlag Berlin GmbH
ISBN: 9783832555290
Category : Architecture
Languages : en
Pages : 0
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Book Description
Regardless of the field, measurements are essential for validating theories and making well-founded decisions. A criterion for the validity and comparability of measured values is their uncertainty. Still, in room acoustical measurements, the application of established rules to interpret uncertainties in measurement is not yet widespread. This raises the question of the validity and interpretability of room acoustical measurements. This work discusses the uncertainties in measuring room acoustical single-number quantities that complies with the framework of the "Guide to the Expression of Uncertainty in Measurement"(GUM). Starting point is a structured search of variables that potentially influence the measurement of room impulse responses. In a second step, this uncertainty is propagated through the algorithm that determines single-number quantities. A second emphasis is placed on the investigation of spatial fluctuations of the sound field in auditoria. The spatial variance of the sound field in combination with an uncertain measurement position marks a major contribution to the overall measurement uncertainty. To reach general conclusions, the relation between changes in the measurement location and the corresponding changes in measured room acoustical quantities is investigated empirically in extensive measurement series. This study shows how precisely a measurement position must be defined to ensure a given uncertainty of room acoustical single-number quantities. The presented methods form a foundation that can be exibly extended in future investigations to include additional influences on the measurement uncertainty.
Author:
Publisher:
ISBN:
Category : Airplane sounds
Languages : en
Pages : 536
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Book Description
Author: V. A. Del Grosso
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
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It was shown in Part 1 (AD-437 995) of this series of reports that appreciable errors in sound speed and sound absorption determinations may be attributed to a neglect in applying appropriate corrections to those situations closely approximating free-field conditions (finite size, plane-parallel source). In the present report it is shown that appreciable errors in the measurement of sound speed and sound absorption for guided mode propagation may be attributed to neglect in applying corrections that may be required because of the selection of geometric parameters or the method of measurement. This report contains graphs of pressure and phase, relative to planewave values and averaged over a plane-parallel receiver of size equal to the source size, for acoustic energy propagation down a right-circular liquid cylinder with lateral boundary condition appropriate to one of the following: absolutely rigid walls, infinitely flexible walls, liquid walls, or elastic solid walls. The latter boundary condition, which is considered to be that more appropriate to the situation of a liquid contained within a thick-walled metal tube, is shown to result in maximum anomalies in sound speed determinations when the transducer completely closes one end of the tube. (Author).
Author: Anton Fuchs
Publisher: Springer
ISBN: 3319240552
Category : Technology & Engineering
Languages : en
Pages : 130
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Book Description
This book presents seven chapters examining selected noise, vibration and harshness (NVH) topics that are highly relevant for automotive vehicle development. These include applications following the major trends toward increased passenger comfort, vehicle electrification and lightweight design. The authors of the seven chapters, all of which are experts from the automotive industry and academia, present the foremost challenges and potential solutions in this demanding field. Among others, applications for sound optimization in downsized engines, noise optimization in electric powertrains, weight reduction options for exhaust systems, porous materials description, and the vibro-acoustic analysis of geared systems are discussed.
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ISBN:
Category : Acoustical engineering
Languages : en
Pages : 724
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Author: Brian F.G. Katz
Publisher: BoD – Books on Demand
ISBN: 1839690054
Category : Technology & Engineering
Languages : en
Pages : 234
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Book Description
Spatial audio is a dynamic and rapidly evolving field, as it is closely linked to advances in computer technology and digital signal processing. The democratization of virtual reality hardware available as consumer devices has moved the field further out of traditional laboratory research, and directly into applied research targeting a wide range of consumers. Advances in Fundamental and Applied Research on Spatial Audio presents a collection of eight peer-reviewed chapters on this exciting area of research. The contributions are organized into three sections: “Acoustic Methodology”, “Perception”, and “Applications”, and cover a range of topics, addressing both headphone- and loudspeaker-based reproductions, offering both methodological overviews and specific case studies.
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Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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