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 13 of 13 for “"Acoustic Characterization"”.
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Broadband acoustic characterization of the deep scattering layer
… This thesis leverages long-term broadband acoustic observations and signal processing methods to characterize the DSL from the individual to the population level, with the goal of improving biomass estimates and elucidating DSL dynamics in relation to oceanographic processes. Over two …
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Acoustic characterization of a stationary field synchronous motor
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Acoustic Characterization and Preliminary Noise Control of Pneumatic Percussion Tools
… presents a comprehensive methodology for the acoustic characterization and noise source identification of these percussion tools. The methodology is applied to a representative pneumatic tool and the characterization results are described in detail. A mechanical analysis was performed on a …
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ACCELERATED NOISE INTERFEROMETRY-BASED PASSIVE ACOUSTIC CHARACTERIZATION OF THE LITTORAL OCEAN
Acoustic remote sensing of the ocean traditionally relies on controlled sound sources and active sonars. Alternatively, the seabed and the water column can be characterized acoustically in a surreptitious and environmentally friendly way using noise interferometry. Noise interferometry exploits …
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Acoustic characterization of the glides /j/ and /w/ in American English
Acoustic analyses were conducted to identify the characteristics that differentiate the glides /j,w/ from adjacent vowels. These analyses were performed on a recorded database of intervocalic glides, produced naturally by two male and two female speakers in controlled vocalic and prosodic contexts. …
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Safety First, Bubbles Second: Integrating Regulatory Compliance with Innovation in Rapid Prototyped Focused Ultrasound Devices
… 10993), electrical safety (IEC 60601-1), and acoustic characterization (IEC 62127-1). The framework was applied to a case study involving 3D-printed materials commonly used in rapid prototyping for FUS research, assessing performance according to established guidance documents and …
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Conformable Ultrasound Face Patch for Cavitation-enhanced Transdermal Cosmeceutical Delivery
… are verified with electrical and mechanical characterization results. Subsequently, acoustic spectrum analysis and high-speed videography are conducted to elucidate a holistic understanding of the cavitation mechanism generated by intermediate-frequency sonophoresis. Together, the simulation …
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Variability in cross-dialectal production and perception of contrasting phonemes: the case of the alveolar-retroflex contrast in Beijing and Taiwan Mandarin
… of the production study indicate that the acoustic characterization of Beijing vs. Taiwan Mandarin alveolar-retroflex contrast varies by vowel and by how each contrasting phoneme is realized in a particular vowel context. Focal prominence is found to result in longer syllable durations but …
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Experimental Design, Data Analysis, and Modeling for Characterizing the Three-Dimensional Acoustic Field of a Seismic Airgun Array
In June 2003, the Littoral Acoustic Demonstration Center conducted an acoustic characterization experiment for a standard seismic exploration array. Two moorings with Environmental Acoustic Recording Systems (EARS) were deployed in the northern part of the Gulf of Mexico to measure ambient noise …
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Investigation of Dynamic Ultrasound Reception in Bat Biosonar Using a Biomimetic Pinna Model
… (i) Do local shape features impact the acoustic effects during dynamic deformation of the bat pinna? and (ii) do these shape deformations provide a substrate for the dynamic encoding of sensory information? For this, a family of simplified biomimetic prototypes has been designed based on …
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Effects of Thermoacoustic Oscillations on Spray Combustion Dynamics with Implications for Lean Direct Injection Systems
Thermoacoustic instabilities in modern high-performance, low-emission gas turbine engines are often observable as large amplitude pressure oscillations and can result in serious performance and structural degradations. These acoustic oscillations can cause oscillations in combustor through-flows …
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Vibration Characterization and Numerical Modeling of a Pneumatic Impact Hammer
Hand transmitted vibration (HTV) is one of the most common hazards faced by workers in the construction industry. A major source of HTV is hand held percussion tools, such as pneumatically driven chipping hammers and rock drills. This thesis presents a new approach to measuring the vibration from …