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 52 for “"Engine model"”.
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Development of an engine model for an integrated aircraft design tool
This thesis describes the development of a new engine weight surrogate model and High Pressure Compressor (HPC) polytropic efficiency correction for the propulsion module in the Transport Aircraft OPTtimization (TASOPT) code. The goal of this work is to improve the accuracy and applicability of …
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Coupling of Chemical Kinetics with Computational Fluid Dynamics in a Three-Dimensional Engine Model
The role of computer modeling has grown recently to integrate itself as an inseparable tool to experimental studies for the optimization of automotive engines and the development of future fuels. Traditionally, computer models rely on simplified global reaction steps to simulate the combustion and …
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Biologically Inspired Cognitive Radio Engine Model Utilizing Distributed Genetic Algorithms for Secure and Robust Wireless Communications and Networking
… from the implementation and testing of the model in a hardware test bed and simulation test bench are presented, with a focus on rapidly deployable disaster communications. Research contributions include developing a biologically inspired model of cognition in a radio architecture, proposing …
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Exergy Based SI Engine Model Optimisation. Exergy Based Simulation and Modelling of Bi-fuel SI Engine for Optimisation of Equivalence Ratio and Ignition Time Using Artificial Neural Network (ANN) Emulation and Particle Swarm Optimisation (PSO).
In this thesis, exergy based SI engine model optimisation (EBSIEMO) is studied and evaluated. A four-stroke bi-fuel spark ignition (SI) engine is modelled for optimisation of engine performance based upon exergy analysis. An artificial neural network (ANN) is used as an emulator to speed up the …
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Simulation of a novel electromechanical engine valve drive to quantify performance gains in fuel consumption
This thesis describes the modeling and simulation of a novel electromechanical valve drive known as the MIT EMV. This valve drive allows an engine to achieve variable valve timing which has been shown to produce improvements in engine fuel efficiency. To test this improvement, a reference engine …
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Development of a High Speed Data Acquisition System for Spark Ignition Engine
Full engine control can only be accomplished with multi-input multi-output (MIMO) control system requiring measurement of variables for which no sensor/instrument is yet available in the Renewable Energy and Engines Laboratory, therefore a less detailed single input single output (SISO) engine …
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Neural network control of nonstrict feedback and nonaffine nonlinear discrete-time systems with application to engine control
… system of equations for a spark ignition engine model to reduce the cyclic dispersion of heat release"--Abstract, page iv.
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A numerical investigation into the tactical advantages of supercruise for combat aircraft
… upgrading a hypothetical aircraft with a newer engine model. The airframe is largely based on the Dassault Mirage III, and the engines are based on the SNECMA Atar 9k50 and M53. A brief overview of recent developments in combat aircraft design and engine performance is provided which illustrates …
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Wind tunnel testing of a nacelle bypass concept for a quiet supersonic aircraft
… is used to encircle the asymmetric external engine protuberances of a traditional turbine engine. Although this bypass flow may reduce the overall sonic boom signature of the vehicle, the engine gearbox and protuberances create a highly complex 3-D flow in the annular bypass region. To better …
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Multi-Physics Engine Simulation Framework for Drive Cycle Emissions Prediction. Development and Validation of a Framework for Transient Drive Cycle NOx Prediction Modelling based on Combining 1-D and 0-D Internal Combustion Engine Simulation and Statistical Meta-Modelling
… drive cycle simulations with high-fidelity engine-out NOx emissions prediction capability is a significant challenge nowadays. Specifically, being able to perform these simulations early in engine development process would allow powertrain optimisation in virtual space, leading to reduction …
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Numerical Solutions for Two- and Three-Dimensional Non-Reacting Flowfields in an Internal Combustion Engine
… in a spark- ignition internal combustion engine during the four-stroke (intake, compression, power, exhaust) cycle is considered. Only fluid-dynamic effects are treated with combustion simulated by constant- volume heat addition near top-dead-center on the compression stroke. The working …
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Two contrasting approaches to auto-ignition modelling for HCCI engines
… of two hydrocarbon fuel auto-ignition models formulated for the emulation of combustion dynamics in Homogeneous Charge Compression Ignition (HCCI) engines. The first (empirical) auto-ignition model was adapted from its previously published form, for HCCI engine model implementation. …
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Performance and Emissions Study of N+3 and N+4 Engine Models with Several Fuel types Using NPSS
… performance and emissions associated with the engines. The simulation is performed on the software called NPSS which is a component-based object-oriented engine cycle analysis and simulation tool. Liquid hydrogen (LH2), liquefied natural gas (LNG), ammonia (NH3), and ammonia-borane (AB) are …
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Hybrid Dynamic Modelling of Engine Emissions on Multi-Physics Simulation Platform. A Framework Combining Dynamic and Statistical Modelling to Develop Surrogate Models of System of Internal Combustion Engine for Emission Modelling
The data-driven models used for the design of powertrain controllers are typically based on the data obtained from steady-state experiments. However, they are only valid under stable conditions and do not provide any information on the dynamic behaviour of the system. In order to capture this …
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Hybrid Dynamic Modelling of Engine Emissions on Multi-Physics Simulation Platform. A Framework Combining Dynamic and Statistical Modelling to Develop Surrogate Models of System of Internal Combustion Engine for Emission Modelling
The data-driven models used for the design of powertrain controllers are typically based on the data obtained from steady-state experiments. However, they are only valid under stable conditions and do not provide any information on the dynamic behaviour of the system. In order to capture this …
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Limit Theorems for Random Billiard Models
… In particular, we study two specific model systems; one which models gas diffusion through cylindrical channels whose walls have a microscopic structure, and another which models a minimalistic heat engine. The main results for the gas diffusion model, a series of probabilistic limit …
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Free-Piston Stirling Convertor Model Development, Validation, and Analysis for Space Power Systems
… Convertor (ASC) is a free-piston Stirling engine coupled with a linear alternator currently being under extended testing at the NASA Glenn Research Center (GRC). Using the Sage 1-D Stirling modeling software, a linear alternator model was developed using two separate methods and integrated …
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Characterization of in-use emissions from on-highway heavy-duty diesel engines
… found to vary from 1.17 to 1.83 depending upon engine model, model year, manufacturer and the driving route.
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Evaluation of regulated emissions from heavy-duty diesel vehicles in the South Coast Air Basin
… diesel vehicles were examined in relation to engine model year to understand how emissions production from diesel vehicles has improved in recent years. Emissions of CO, CO2, HC, NO X and PM were sampled during each test run for every diesel vehicle in the CRC E55/59 Phase I study. (Abstract …
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