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Methods for Sound Quality Evaluations: Applied to Noise from Aircraft and Construction Vehicles
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. , x, 47 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2014:12
National Category
Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-146221ISBN: 978-91-7595-138-6 (print)OAI: oai:DiVA.org:kth-146221DiVA: diva2:722972
Public defence
2014-06-11, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20140610

Available from: 2014-06-10 Created: 2014-06-10 Last updated: 2014-06-16Bibliographically approved
List of papers
1. Evaluation of sound quality of wheel loaders using a human subject for binaural recording
Open this publication in new window or tab >>Evaluation of sound quality of wheel loaders using a human subject for binaural recording
2002 (English)In: Noise Control Engineering Journal, ISSN 0736-2501, E-ISSN 2168-8710, Vol. 50, no 4, 117-126 p.Article in journal (Refereed) Published
Abstract [en]

The sound quality of four different models of wheel loaders was evaluated using twenty-eight experienced male operators as subjects. Using these human subjects, sounds were recorded binaurally and played back through headphones. Tachometer recordings were also made from the engines and transmissions in order to trace the origins of amplitude peaks in the signals. There were two sessions (viz. lift and transportation) for each wheel loader. Altogether, there were eight sessions for all four wheel loaders. Tachometer signals indicated that peaks were dominated mainly by pinion and drop box for the transport sounds, whereas the peaks of hydraulic orders (i.e., between 250 and 1000 Hz) were dominant for the lift sounds. The dominant peaks were damped by either 3 or 6 dB, thus creating new modified sounds. Both original and modified sounds were then played randomly and separately for all sessions using a paired comparisons method. The results showed that the pinion and drop box were causing annoyance for the transportation sounds, while the hydraulic orders were causing annoyance for the lift sounds. The results also revealed that damping the tonal components created by the drop box reduced the annoyance response more significantly than damping the tonal components made by the pinion. This indicates that the tonal components in higher frequencies were more annoying than the tonal components in lower frequencies. In the final part of the study, multivariate analysis was applied in order to model annoyance of noises from the four different models of wheel loaders for both sessions (i.e., lift and transportation) on the basis of the sound quality descriptors. Annoyance prediction models for all sessions were developed based on the articulation index and a newly developed descriptor, viz. tonal ratio. The new descriptor identifies the tonal components by comparing the sound pressure level of each 1/3-octave band of the peaks between 125 and 3150 Hz with the two 1/3-octave-band levels adjacent to it.

Keyword
multivariate-analysis, noise, annoyance, components
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-22419 (URN)000182196900001 ()
Note

QC 20100525

Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved
2. A quicker method of using paired comparisons for the sound quality evaluation
Open this publication in new window or tab >>A quicker method of using paired comparisons for the sound quality evaluation
2006 (English)In: EURONOISE 2006 - The 6th European Conference on Noise Control: Advanced Solutions for Noise Control, 2006Conference paper, Published paper (Refereed)
Abstract [en]

Paired Comparison Method (PCM) is widely used by the researchers for evaluating subjective judgments of various stimuli. The conventional PCM is usually used only for a limited number of stimuli (N) since the number of pairs to judge becomes N(N-1)/2 and therefore the number of pairs increases with the number of stimuli. This makes the paired comparisons method very time consuming and more demanding if the numbers of stimuli increase. A novel method is therefore developed which gives similar results as PCM but requires significantly less number of pairs for the comparisons. As a result, this new method could be used to judge a larger number of stimuli. To this end a sorting algorithm such as mergesort is used to obtain the matrix of preference, resulting in about O(N log N) pairs of comparisons. A sorting algorithm reduces the number of pair comparisons using the transitivity of earlier responses given by the subject. Such pair comparisons provide the opportunity to include a larger number of stimuli to include for the evaluation. 12 aircraft sounds were presented to the subjects using headphones. The conventional PCM gave 66 pairs of sounds to be judged by the subjects whereas the mergesort produced only 31 pairs of sounds to be judged. The study reveals the comparisons between the results of conventional PCM and the mergesort.

Keyword
Mergesort, Paired comparison, Quicksort, Sorting algorithms, Sorting based paired comparison
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-7551 (URN)2-s2.0-84872500683 (Scopus ID)
Conference
6th European Conference on Noise Control: Advanced Solutions for Noise Control, EURONOISE 2006; Tampere;30 May 2006 through 1 June 2006
Note

QC 20120907

Available from: 2007-10-22 Created: 2007-10-22 Last updated: 2014-06-16Bibliographically approved
3. Quality of stationary and non-stationary aircraft sounds: the effect of tonal components and level equalization
Open this publication in new window or tab >>Quality of stationary and non-stationary aircraft sounds: the effect of tonal components and level equalization
(English)In: Acta AcusticaArticle in journal (Other academic) Submitted
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-7552 (URN)
Note
QS 20120326Available from: 2007-10-22 Created: 2007-10-22 Last updated: 2014-06-16Bibliographically approved
4. A method for time-varying annoyance rating of aircraft noise
Open this publication in new window or tab >>A method for time-varying annoyance rating of aircraft noise
2009 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 126, no 1, 1-3 p.Article in journal (Refereed) Published
Abstract [en]

The method of continuous judgment by category is used and evaluated to measure time-varying attributes in aircraft flyover sounds. The results are also used to estimate preference between the different experimental sounds. Jurors were asked to rate perceived annoyance on a Borg CR 100 scale continuously during the playback of 11 flyover sequences and the results showed differences in perception in the time segment where the sound had been modified. The method can be used to evaluate maximum perceived annoyance, threshold levels, duration of perceptual presence temporal integration in perception, and perceptual mixtures over time.

Keyword
acoustic signal processing, aircraft testing, hearing, noise pollution
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-32180 (URN)10.1121/1.3147485 (DOI)000268065100008 ()2-s2.0-68149098452 (Scopus ID)
Note
QC 20110408Available from: 2011-04-08 Created: 2011-04-08 Last updated: 2017-12-11Bibliographically approved
5. Continuous judgment by category-ratio scaling of aircraft noise
Open this publication in new window or tab >>Continuous judgment by category-ratio scaling of aircraft noise
2014 (English)In: Applied Acoustics, ISSN 0003-682x, Vol. 84, 3-8 p.Article in journal (Refereed) Published
Abstract [en]

A continuous judgment by category-ratio (CJCR) scaling method was used to evaluate the instantaneous annoyance of original and modified aircraft sounds. The result from the proposed method resulted in a temporal stream of annoyance levels for the whole flyover sequence that could be further analyzed. The test subjects were continuously rating their instantaneous annoyance on a Borg CR 100 scale (R) during the playback of 10 flyover sequences. Using a category-ratio (CR) scale instead of a category (C) scale, mathematical operations such as calculations of average were enabled but gave also advantages in terms of higher resolution in the responses. The results showed differences in perception in the time segment where the sound had been modified. The temporal stream of annoyance was also converted into overall judgments of the sounds, these estimations showed consistency with previous results obtained using the semantic differential and paired comparison method.

Keyword
Aircraft noise, Annoyance, Continuous judgment by category-ratio scaling
National Category
Aerospace Engineering
Identifiers
urn:nbn:se:kth:diva-146713 (URN)10.1016/j.apacoust.2014.02.013 (DOI)000337779500002 ()2-s2.0-84901609548 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme
Note

QC 20140806. Updated from manuscript to article in journal.

Available from: 2014-06-13 Created: 2014-06-13 Last updated: 2017-12-05Bibliographically approved
6. Estimating aircraft noise annoyance, a linear regression model
Open this publication in new window or tab >>Estimating aircraft noise annoyance, a linear regression model
(English)Manuscript (preprint) (Other academic)
Identifiers
urn:nbn:se:kth:diva-146714 (URN)
Note

QS 2014

Available from: 2014-06-13 Created: 2014-06-13 Last updated: 2014-06-16Bibliographically approved
7. Category-Ratio scaling of instantaneous annoyance caused by noise or tones
Open this publication in new window or tab >>Category-Ratio scaling of instantaneous annoyance caused by noise or tones
(English)Manuscript (preprint) (Other academic)
Identifiers
urn:nbn:se:kth:diva-146715 (URN)
Note

QS 2014

Available from: 2014-06-13 Created: 2014-06-13 Last updated: 2014-06-16Bibliographically approved

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