Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 60 for “"Acoustic analysis"”.
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Structure-acoustic analysis; finite element modelling and reduction methods
This thesis investigates structure-acoustic systems by use of finite element analysis. The systems studied here are limited to those that consist of an enclosed acoustic fluid cavity, which is coupled to a flexible structure and/or a porous sound absorbing material domain. This type of analysis is …
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Acoustic Analysis of the Voice in Native and Nonnative Speakers
… native speakers (L1) of French and Spanish on acoustic spectral and cepstral analyses; and (2) compare ratings on auditory-perceptual assessment with acoustic data secondary to degree of accentedness. Perceptual analyses and voice quality measures for frequency, cepstral measures, and …
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Acoustic analysis of rock cutting process for impregnated diamond drilling
… of the drilling medium. In this thesis, Acoustic Emission (AE) along with Measuring While Drilling (MWD) parameters are considered as an alternative technique to remotely monitor the ID bit wear condition (sharp and blunt) and rock properties (abrasivity). A series of rigorous and …
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Acoustic analysis and synthesis of nasal codas in Mandarin Chinese
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Structural acoustic analysis of shape memory alloy hybrid composite panels
… the Rayleigh-Ritz method and finite panel acoustic radiation theory to investigate the use of SMA hybrid composite materials for adaptive structural acoustic control by active structural tuning. Analytical models are formulated considering classical laminated plate theory (CLPT) and …
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Acoustic Analysis of Spacecraft Cavities using the Boundary Element Method
… ascension through the atmosphere. In particular, acoustic loads imposed on stowed satellites within the launch vehicle fairing can result in high mechanical loads on sensitive spacecraft hardware. These acoustic loads have the potential to damage important components and as such it is necessary to …
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Listening to nature: Acoustic analysis for monitoring wildlife management and protected areas
… areas (PAs) and pest control programmes. Passive acoustic monitoring (PAM) coupled with acoustic indices and automated identification are promising tools for biodiversity monitoring. However, two technical bottlenecks are still important limitations for their wide use. Automatic identification …
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An acoustic analysis of labialization of coronal nasal consonants in American English
… It is hypothesized that listeners can use these acoustic cues to uncover the intended place of articulation of assimilated segments, without recourse to phonological inference or sentence context.
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Diesel-cng dual fuel combustion characterization using vibro-acoustic analysis and response surface methodology
… method was proposed to analyse the vibro-acoustic signal generated by a knock sensor installed at the outer cylinder wall of the engine. The frequency distribution analysis was applied to interpret the high variability of the vibro-acoustic signal. The results were used as the input for …
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Acoustic Analysis of Nomascus Gibbon Songs as a Potential Measure of Current Health Status
… of rehabilitated and released gibbons through acoustic analyses. Gibbon duets are in part genetically determined, but learning may play a role in song development. Additionally, songs may indicate resource holding potential, and are vital to acquiring mates and producing offspring. …
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Development, perceptual evaluation, and acoustic analysis of amplitude-based F0 control in Electrolarynx speech
… device that produces a sound that can be used to acoustically excite the vocal tract as a substitute for laryngeal voice production. ELs provide laryngectomy patients with the basic capability to communicate, but current EL devices produce a mechanical speech quality which has been largely …
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A Comparison of Beijing and Taiwan Mandarin Tone Register: An Acoustic Analysis of Three Native Speech Styles
… of Taiwan and Beijing Mandarin by means of an acoustic analysis of three speech styles. Speech styles included spontaneous interview, spontaneous descriptive, and controlled read sentential speech. Data analysis included long segments of recorded speech in order to discern any statistically …
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Gestural overlap of stop-consonant sequences
This study used an analysis-by-synthesis approach to discover possible principles governing the coordination of oral and laryngeal articulators in the production of English stop-consonant sequences. Recorded utterances containing stop-consonant sequences were analyzed acoustically, with focus on …
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Surface Mediated Transport and Reactions
… still-frame and chemiluminescence imaging, and acoustic analysis. It was found that transient flames display hydrodynamic instabilities and eventually form stable, discontinuous flame structures.
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Acoustic-phonetic analysis of the prespeech vocalizations of babies with cleft palate
… omits potentially important vocal behavior. Acoustic analysis can supplement phonetic analysis and both measures may be utilized to identify communicative abilities of these babies at an early age.
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初级阶段学习者对华语擦音与塞擦音的习得 = The acquisition of the fricatives and affricatives in mandarin by elementary level learners
… first languages. This research is based on acoustic measurements to capture the difference coming up with the foreigners? Chinese pronunciation. The recording is followed by acoustic analysis on the basis of Praat, with an attempt to investigate the value of the learners? pronunciation. This …
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Regional variation in South African English : a socio-phonetic comparison of young white speakers in Cape Town and Durban
… of Wells’ (1982) lexical sets, were selected for acoustic analysis, a selection which was guided partly by the researcher’s own intuitions and partly by observed correlations in the impressionistic literature between certain realisations of these vowels and the Cape and Kwa-Zulu Natal as regions.
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Thermoacoustic Effects of a Variable Equivalence Ratio in a Single Element Methane Combustor
… operating conditions, unsteady heat release and acoustic wave interactions can couple and lead to instabilities, such as self-sustaining pressure oscillations, that can lead to reduced combustor performance and potentially hardware damage. In this project, the thermoacoustic effects of …
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An Acoustic Study of Voiced Stop Allophony in Costa Rican Spanish
… previously considered. The application of an acoustic analysis of these segments has provided a quantitative approach to the characterization of voiced stop allophony in Spanish.
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