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 74 for “"Propagation Model"”.
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A low frequency underwater sound propagation model
All wave-theoretic underwater sound propagation models attempt to derive the acoustic field originating from a sound source in a specific environment by either solving the wave equation directly or by solving an approximation there-of. This dissertation describes a normal mode direct solution with …
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Noise propagation model for the design of weather specific noise abatement procedures
… actual weather in flight dynamics and noise propagation. The rapid prototyping simulation environment NOIse SIMulator (NOISIM) includes a sound propagation model based on a ray tracing algorithm that incorporates atmospheric and ground effects. The simulator uses standard weather profiles, …
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Flame propagation model for the CFR engine under knocking and non-knocking conditions
… of this project is to develop a combustion model using the turbulent flame propagation concept that can be used to study the influence of the underlying flame speed behaviour during combustion. The model was used to investigate the combustion in the CFR engine (the engine used to measure …
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Two-dimensional quench propagation model for a three-dimensional "high-temperature" superconducting coil
… region is commonly refereed to as normal zone propagation(NZP). A reliable NZP model is necessary for designing protection systems because a quench may cause irreparable damage if a section of the winding is over-heated. This thesis develops a numerical NZP model for a three dimensional, …
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A Comprehensive Hamiltonian Atmospheric Sound Propagation Model for Prediction of Wind Turbine Noise
… in the proximity of wind farms. However, modelling and simulating WTN propagation over large distances is challenging due to the complexity of atmospheric conditions. Real temperature, wind velocity and relative humidity measurements typically show a characteristic nonlinear behavior. A …
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Channel Propagation Model for Train to Vehicle Alert System at 5.9 GHz using Dedicated Short Range Communication
… of opportunity. To provide a thorough channel model of the train to vehicle communication environment that is proposed above, large-scale path loss and small scale fading will both be analyzed to characterize the propagation environment. Measurements were collected at TTCI in Pueblo Colorado to …
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Application of an empirically-derived polytropic index for the solar wind to a solar wind shock propagation model
… index to a two-dimensional solar wind computer model to simulate the effects of thermal heat conduction has been investigated. The current project involves the insertion of this empirically-derived polytropic index into a magnetohydrodynamic model of solar wind propagation. This computer model …
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Antenna effects on indoor wireless channels and a deterministic wide-band propagation model for in-building personal communication systems
… half of the thesis, a deterministic wide-band propagation model that can predict channel impulse responses inside buildings is proposed and implemented. The three dimensional image-based propagation model includes effects of antenna pattern, antenna polarization, geometry of the building, and …
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Validation of the ITU-R P series radio wave propagation model for millimetre wave V-Band (60GHz) line-of-sight point-to-point short distance link
… regarding the effects of the atmosphere on radio propagation. There is growing interest in the use of millimetre-wave spectrum as a potential candidate for the provision of high capacity, short range, and backhaul solutions within future 5G ultra-dense network infrastructures. However, these …
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Correlation of Radio Wave with Photometric Light for Representation of Radio Loss using Transparent Film and its Implementation using MATLAB
… planning system requires building vector data, propagation model parameters, obstacle information, and antenna models which makes planning and optimization of an indoor system an extremely complex and tedious process. To account all these problems, a proper and simple propagation model is needed …
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Variation propagation modelling and cost-oriented process optimisation for aircraft assembly
… to sub-component manufacture, part variation propagation necessitates expensive and time consuming variation management processes such as shimming in order to ensure the final assembly is within specification. This thesis focuses on how the overall production cost can be minimised, and …
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Integration of rain fade into OPNET
OPNET is one of the widely used modelling and simulation software packages in the telecommunications industry for planning, design, and research and development. In the wireless modeller module, it uses common propagation models to model radio propagation. It is also possible for users to include …
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AMADEOS outil de création de scénarii réalistes dans les réseaux ad hoc mobiles
… module named AMADEOS (A dvanced M obility Model in AD hoc NE twO rkS ) was developed as an extension for the CANUmobisim framework, a powerful mobility trace generator. AMADEOS makes it easy and fast to generate realistic mobility. It allows the editing of spatial environments with …
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A Propagation Simulator for Land Mobile Satellite Communications
… communications link can be determined by the propagation path between a satellite and mobile users. Some of the most important factors are multipath propagation and vegetative shadowing. System designers should have the most reliable information about the statistics of fade duration in order …
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Effects of atmospheric profiles on local infrasound propagation
… environment on local (< 150 km) infrasound propagation is important, specifically for persistent infrastructure monitoring. Passively sensing the infrasound field provides useful information about the condition of infrastructure or any activity of interest in the infrasound passband. …
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Fixed chain-based wireless sensor network for intelligent transportation systems
… there are some challenges related to radio propagation, energy constraints and the Media Access Control (MAC) protocol. This thesis develops a ground level radio propagation model for communication between road studs, and energy efficiency metrics to manage the resources to overcome the …
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Quantum noise propagation in nonlinear optical media
… of this dissertation a general quantum optical model is developed from fundamental principles to describe optical propagation in a broad variety of nonlinear media. The central distinction of the resulting Quantum Macroscopic Propagation Model ( QMPM) is that material susceptibilities, …
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Radio propagation analysis for improved UAV data muling of surfaced underwater sensor nodes
… unmanned air vehicle. We present a mathematical model for predicting signal strength with respect to distance and height using a two-ray propagation model in conjunction with the individual radiation patterns of transmitting and receiving antennas. Signal quality over space is then be used to …
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Statistical modeling and simulation of mobile satellite propagation
… decade will need to operate in the presence of propagation effects such as vegetative shadowing and multipath that will cause signal fading. This paper discusses the statistical modeling and simulation of the land mobile satellite fading environment. Simple models are developed to approximate …
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A three-dimensional analytical study of spatial variability of seismic ground motions
… and design of lifeline systems. An analytical model for wave propagating through a three-dimensional half-space is first proposed to evaluate the ground responses. The incoherent slip over a fault plane is then represented by an autocorrelation function of the dislocation velocity, from which …
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