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 132 for “"Noise Sources"”.
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Turbulent noise sources in vocal tract models
Thesis (Elec. E. and M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1988.
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Scaling IoT-based noise cancellation to multiple noise sources
… (IoT) sensing techniques with active noise cancellation (ANC) has demonstrated certain benefits over the conventional methods for ANC, including wideband cancellation without blocking the ear and non-causal adaptive filtering. These benefits, however, can only be observed in acoustic …
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Investigation of Noise Sources and Propagation in External Gear Pumps
… to human operators and passengers where noise is one of the main constraints to the acceptance and spread of this technology.
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Investigation of noise sources in scaled CMOS field-effect transistors
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Investigation of Noise Sources in Three-Stream Jets using Turbulence Characteristics
Key areas of noise sources are investigated through comparison of eddy convection velocity and turbulence measurements in three-stream nozzles. A Time-Resolved Doppler Global Velocimetry (TR-DGV) Instrument was applied to the Nozzle Acoustic Test Rig (NATR) at NASA's Aero-Acoustic Propulsion Lab …
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Numerical characterization of rotor broadband noise sources in a high bypass-ratio turbofan
… qui pourraient quantifier l'importance des sources différents de rotor. C'est particulièrement lié au comportement complexe de l'écoulement de rotor, qui ne peut être modélisé que par les méthodes de haute précision. L'autre facteur c'est les ressources numériques importantes dont on a …
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Measurement and Prediction of Rotor Noise Sources for sUAS in Outdoor and Laboratory Environments
… comparison of aerodynamic performance and noise of eVTOL rotors operating in multiple facilities, and analysis of the noise associated with an outrunner brushless DC motor. Empirical and low-order models are used to predict aerodynamic performance, tonal noise, and broadband noise for …
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LORE Approach for Phased Array Measurements and Noise Control of Landing Gears
A novel concept in noise control devices for landing gears is presented. These devices consist of elastic membranes creating a fairing around the major noise sources. The purpose of these devices is to reduce wake interactions and to hide components from the flow, thus, reducing the noise emission. …
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Characterizing the perceptual diffusion of auditory lateralization images
When two statistically independent noise sources with different interaural time delays are presented simultaneously over headphones, the separated source images seem to become diffuse and merge over time. Experiments were designed to test the hypothesis that the measure of diffusion perceived would …
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Noise analysis of switched capacitor filters
The self noise output of switched-capacitor (SC) filters was examined. The two main noise sources in SC filters are switch transistors and the operational amplifiers. These noise sources were modeled as switch thermal white noise and op-amp input white noise. The existence of direct and …
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Noise and delays in adaptive interacting oscillatory systems
… interactions to be time delayed and subject to noise sources affecting either the orbits of the local dynamics and/or the connectivity of the network. Within this very general dynamical context, we construct and focus on interactions enabling a certain level of adaptation between the local …
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NOISE MEASUREMENTS AND EVALUATION OF SOUND SOURCES OF ROAD VEHICLES
This thesis investigates traffic noise pollution's health/environmental impacts, motivated by high-density urban experiences worldwide It reviews noise sources, effects, mitigation strategies, and compares ICE (Volkswagen SUV) and EV (Renault) noise at 10, 30, 50 km/h via SoundCam 2.0 acoustic …
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Point-Spread Function Assessment of SG-DBR Based Swept Source for OCT Imaging
… repetition rate, widely-tunable coherent laser sources. Sampled grating distributed Bragg reflector (SG-DBR) lasers are proven in telecom applications and are expected to fulfill the requirements for SS-OCT at a significantly lower cost than alternative solutions.</p> <p>Constructed entirely on …
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ATM over an asymmetric digital subscriber line
… simulation model outlining the development of noise sources in the network is described and modules for the network implementation are discussed. The local loop and the effects of different impairments such as bridge taps, line length, and wire gauge are also considered. The impairments in the …
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Detecting Extrasolar Planets using IFS-based Simultaneous Differential Imaging
… of stellar light and consequently important noise sources like speckles. In order to verify the efficiency of such a technique, we developed a simulation code able to test the capabilities of this IFS-SDI technique for different kinds of planets and telescopes, modelling the atmospheric and …
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Design trade studies and assessment for advanced quiet aircraft concepts
… for a range of 4,000nm and 250 passengers. A noise assessment was conducted on the engine and airframe noise sources of the resulting design. The noise impacts of five engine (jet, fan forward, fan rearward, core, and turbine) and airframe (airfoil, elevator, slat, drag rudder, and …
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Aeroacoustic Study of a Model-Scale Landing Gear in a Semi-Anechoic Wind Tunnel
… The VT Anechoic Stability Wind Tunnel allowed noise measurements to be carried out using both a 63-elements microphone phased array and a linear array of 15 microphones. The noise sources were identified from the flyover view under various flow speeds and the phased array positioned in both the …
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Signal and noise propagation in genetic circuits
… and cellular memory. Accurately predicting noise propagation in gene networks is thus crucial for reverse engineering natural networks and designing reliable synthetic genetic circuits. To determine how noise propagates through gene networks we measure, in single bacterial cells, expression …
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Near-field scanning study for radio frequency interference estimation
… the system is very likely interfered by multiple noise sources simultaneously. A method is proposed to identify the interference from different noise sources separately, even when they are radiating at the same time. This method is very helpful for engineers to identify the contribution of the …
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