Dissertations / Theses: 'Engine system'

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Romanov, Artyom. "Rocket Engine System Analysis : Vinci Engine Turbines Analysis, Volvo Aero Corp." Thesis, Linköping University, Linköping University, Linköping University, Applied Thermodynamics and Fluid Mechanics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-17766.

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Major part of the current work describes the development of the update methodology for onedimensional code (TML) currently used at Volvo Aero Corporation during turbine design process. The methodology is then applied and tried out in a general engine analysis (GESTPAN).

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Mahmoud, Osama Esmail. "An intelligent engine condition monitoring system." Thesis, University of Newcastle Upon Tyne, 2009. http://hdl.handle.net/10443/1665.

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The main focus of the work reported here is in the design of an intelligent condition monitoring system for diesel engines. Mechanical systems in general and diesel engines in particular can develop faults if operated for any length of time. Condition monitoring is a method by which the performance of a diesel engine can be maintained at a high level, ensuring both continuous availability and design-level efficiency. A key element in a condition monitoring program is to acquire sensor information from the engine, and use this information to assess the condition of the engine, with an emphasis on monitoring causes of engine failure or reduced efficiency. A Ford 70PS 4-stroke diesel engine has been instrumented with a range of sensors and interfaced to a PC in order to facilitate computer controlled data acquisition and data storage. Data was analyzed to evaluate the optimum use of sensors to identify faults and to develop an intelligent algorithm for the engine condition monitoring and fault detection, and in particular faults affecting the combustion process in the engine. In order to investigate the fault-symptom relationships, two synthetic faults were introduced to the engine. Fuel and inlet air shortage were selected as the faults for their direct relationship to the combustion process quality. As a subtask the manually operated hydraulic brake was adapted to allow automatic control to improve its performance. Two modes of controlling were designed for the developed automatic control of the hydraulic brake system. A robust mathematical diesel engine model has been developed which can be used to predict the engine parameters related to the combustion process in the diesel engine, was constructed from the basic relationships of the diesel engine using the minimum number of empirical equations. The system equations of a single cylinder engine were initially developed, from which the multi-cylinder diesel engine model was validated against experimental test data. The model was then tuned to improve the predicted engine parameters for better matching with the available engine type. The final four-cylinder diesel engine model was verified and the results show an accurate match with the experimental results. Neural networks and fuzzification were used to develop and validate the intelligent condition monitoring and fault diagnosis algorithm, in order to satisfy the requirements of on-line operation, i. e. reliability, easily trained, minimum hardware and software requirements. The development process used a number of different neural network architecture and training techniques. To increase the number of the parameters used for the engine condition evaluation, the Multi-Net technique was used to satisfy accurate and fast decision making. Two neural networks are designed to operate in parallel to accommodate the different sampling rate of the key parameters without interference and with reduced data processing time. The two neural networks were trained and validated using part of the measured data set that represents the engine operating range. Another set of data, not utilized within the training stage, has been applied for validation. The results of validation process indicate the successful prediction of the faults using the key measured parameters, as well as a fast data processing algorithm. One of the main outcomes of this study is the development of a new technique to measure cylinder pressure and fuel pressure through the measurement of the strain in the injector body. The main advantage of this technique is that, it does not require any intrusive modification to the engine which might affect the engine actual performance. The developed sensor was tested and used to measure the cylinder and fuel pressure to verify the fuel fault effect on the combustion process quality. Due to high sampling rate required, the developed condition monitoring and fault diagnosis algorithm does not utilize this signal to reduce the required computational resources for practical applications.

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Watson, Veronica. "Basic system configuration in search engine." Xavier University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=xavier1545566567119888.

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Driscoll, Robert B. "Investigation of Sustained Detonation Devices: the Pulse Detonation Engine-Crossover System and the Rotating Detonation Engine System." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1459155478.

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Norouzi, Shahrouz. "Interaction of diesel type fuels and engine fuel system components in compression ignition engines." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5369/.

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Contact of fuels with engine components at low and elevated temperatures for various amounts of time is found to be challenging as this contact has several effects on engine fuel system components and fuels. Also, storage of fuels for a long period of time is found to have almost the same effect on both engine components and fuels upon engine use. In this thesis fuel and engine components’ contact have been studied for four typical metals used in the construction of many engine fuel systems; in form of pure or alloys (copper, aluminium, mild carbon steel and stainless steel), studied after contact with three of the currently available fuels for use in compression ignition engines. Ultra-low sulphur diesel fuel (ULSD) was used as the fossil fuel, rapeseed methyl ester (RME) as the first generation biofuel and finally gas-to-liquid (GTL) as the second generation of biofuel, obtained via the Fischer-Tropsch process. The investigation was performed in different sections: fuels and metals have been studied for any degradation after contact at low and high temperatures for short and long exposure times, and an understanding of the corrosion process and any degradation on both metals and fuels has been achieved; due to the high hygroscopic character of these fuels and the presence of possible impurities in the fuel, the investigation was extended for analysis of the effect of the presence or absence of absorbed water and dissolved air (in the form of Oxygen) in fuels on degradation and corrosion characteristics of these fuels.

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Zhang, Kai. "Air charge system emulation for diesel engine." Thesis, University of Bath, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521014.

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The work presented in this thesis details a novel engine evaluation approach utilising real-time simulation and advanced engine testing systems for general applicability to new generations of air charging systems. A novel engine air charging system including a charge air handling unit (CAHU) has been developed which is connected to an engine to emulate advanced boosting system conditions. Significant analytical and development work has focused on generating a real-time turbocharger model such that the CAHU can be effectively controlled to emulate the turbocharger performance under both steady and pulsating conditions. Experimental work was carried out to evaluate this new engine air charge testing system against a production turbocharged baseline engine. The accuracies with respect to the boost pressure, turbocharger speed, mass air flow, and fuel consumption in the steady state tests are above 95%, and the level of confidence for the engine back pressure is approximately 90%. The difference of turbocharger speed between the steady turbocharger model and the pulsation model is also identified. In engine transient tests, the boost pressure and engine torque have shown fast response characteristics similar to that of the baseline engine. While general transient trends were achieved, some issues were identified with the high speed control of the CAHU interacting with the dSPACE real time turbocharger model. It is proposed that future improvement can be achieved via applying new control algorithms to improve the accuracy and tracking the CAHU control without increasing the system instabilities.

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Xu, Jingbo. "GRAPE : parallel graph query engine." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28927.

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The need for graph computations is evident in a multitude of use cases. To support computations on large-scale graphs, several parallel systems have been developed. However, existing graph systems require users to recast algorithms into new models, which makes parallel graph computations as a privilege to experienced users only. Moreover, real world applications often require much more complex graph processing workflows than previously evaluated. In response to these challenges, the thesis presents GRAPE, a distributed graph computation system, shipped with various applications for social network analysis, social media marketing and functional dependencies on graphs. Firstly, the thesis presents the foundation of GRAPE. The principled approach of GRAPE is based on partial evaluation and incremental computation. Sequential graph algorithms can be plugged into GRAPE with minor changes, and get parallelized as a whole. The termination and correctness are guaranteed under a monotonic condition. Secondly, as an application on GRAPE, the thesis proposes graph-pattern association rules (GPARs) for social media marketing. GPARs help users discover regularities between entities in social graphs and identify potential customers by exploring social influence. The thesis studies the problem of discovering top-k diversified GPARs and the problem of identifying potential customers with GPARs. Although both are NP- hard, parallel scalable algorithms on GRAPE are developed, which guarantee a polynomial speedup over sequential algorithms with the increase of processors. Thirdly, the thesis proposes quantified graph patterns (QGPs), an extension of graph patterns by supporting simple counting quantifiers on edges. QGPs naturally express universal and existential quantification, numeric and ratio aggregates, as well as negation. The thesis proves that the matching problem of QGPs remains NP-complete in the absence of negation, and is DP-complete for general QGPs. In addition, the thesis introduces quantified graph association rules defined with QGPs, to identify potential customers in social media marketing. Finally, to address the issue of data consistency, the thesis proposes a class of functional dependencies for graphs, referred to as GFDs. GFDs capture both attribute-value dependencies and topological structures of entities. The satisfiability and implication problems for GFDs are studied and proved to be coNP-complete and NP-complete, respectively. The thesis also proves that the validation problem for GFDs is coNP- complete. The parallel algorithms developed on GRAPE verify that GFDs provide an effective approach to detecting inconsistencies in knowledge and social graphs.

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Dietrich, Hans. "Vergleich des Kreiskolbenmotors System NSU-Wankel mit dem Hubkolbenmotor." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-115035.

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Frick, Peyton M. "A hydraulic actuated thermal management system for large displacement engine cooling systems." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1193080466/.

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Sjöstrand, Johan. "A communication system for a pluggable game engine." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8361.

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This thesis documents the development of a communication system that is part of a pluggable game engine for a course in advanced game programming. It covers some techniques and problems in network game programming, a description of the developed system and an example of how the system is used in a demo of the game engine.

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Colic, Dalibor, and Jakob Norin. "CONTROL STRATEGY AND MODELING FOR ENGINE OIL SYSTEM." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-55030.

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The power of an engine is not only used to drive the mechanical equipment connected to the engine, but also parts of the engine itself. One of these parts is the oil pump. The minimum needed oil pressure, produced by the pump, varies during the operational run of the engine. The oil pump is, therefore, often over-dimensioned to ensure that the oil supply is adequate. The over-dimensioned oil pump circulates an excessive amount of oil through the system, thus putting unnecessary strain on the engine itself. A strained engine consumes more fuel. To reduce fuel consumption, the ability to control the amount of oil circulated more accurately is therefore of interest. As oil systems are non-linear, Artificial Intelligence controllers are investigated. This work developed four versions of a model of an engine oil system and evaluated a Genetic Algorithm and two versions of Differential Evolution to adjust the weights of a Neural Network that alter the weights in a PID controller. The models were created in Simscape and Simulink, and the Neural Network was created using the Neural Network toolbox in MATLAB. The Genetic Algorithm and Differential Evolution algorithms were coded in MATLAB. The results show that the accuracy of the model is important and that the use of a machine learning algorithm for controlling a fluid system is feasible.

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Gräsberg, Pontus. "IC-Engine Source Characterisation and exhaust system simulations." Thesis, KTH, Marcus Wallenberg Laboratoriet MWL, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299411.

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To be able to predict the sound pressure level emitted by a exhaust system one must be able to describe the source. The source in the form of an engine can linearly be described as a source strength and a source impedance. An IC-engine can acoustically have a non-linear part meaning that the source characteristics have a dependency on the load. The first part of this work investigates through simulation's in GT-Power how these characteristics are affected by the load connected to the source. The Second part of the work combines the source characteristics with simulations of a muffler and compares to different methods of getting the pressure at the outlet of the exhaust. The first method is direct simulation of the muffler in COMSOL Multiphysics and the second is a transfer matrix based calculation. How sensitive the results at the outlet are to changes in the source impedance is also tested. It is concluded that using five loads for the multiload method in the form of five different lengths on the pipe connecting the engine and muffler works when the pipe have the same length as would be seen in reality. Furthermore, the pipe lengths should have a small range, 100 mm between largest and smallest pipe length giving good results. The source characteristics were at least above 1000 RPM stable enough as to not significantly change the sound pressure level at the outlet.
För att kunna modellera ljudtrycket som avges från ett avgassystem behöver man kunna beskriva källan. Källan i form av en bränslemotor kan linjärt beskrivas som en källstyrka och en källimpedans. En bränslemotor kan dock ha en akustisk ickelinjär del vilket medför att källan kan vara beroende utav vilken last i form av ljuddämpare den är kopplad till. Första delen av detta arbete undersöker genom motorsimuleringar i GT-Power hur lasten påverkar källkarakteristiken. Den andra delen av arbetet kombinerar källkarakteristiken med simuleringar av ljuddämparen och jämför olika metoder för att få ljudtrycket vid utloppet av avgassystemet. Den första metoden för detta är direkt simulering av ljuddämparen i COMSOL Multiphysics där källkarakteristiken inkluderas och den andra metoden är transfermatris baserad. Det testas också hur känsligt ljudtrycket vid utloppet av ljuddämparen är för variationer i impedansen. För källkarakteristiken används fem laster per uträkning och slutsatsen dras att lasten i form av röret mellan motor och ljuddämpare samt ljuddämparen bör vara så lik som möjligt det riktiga systemet. Utöver det dras slutsatsen att en liten variation i det kopplande rörets längd ger bättre resultat och att en variation mellan största och minsta röret på 100 mm ger bra resultat. Till sist dras slutsatsen att för varvtal över 1000 RPM är källkarakteristiken tillräckligt stabil för att ge stabila resultat vid utloppet av ljuddämparen, medans under 1000 RPM kan det vara stabilt nog men här är validering viktigare.

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Lius, Andreas. "Single cylinder research engine multi-spark ignition system." Thesis, KTH, Maskinkonstruktion (Inst.), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232371.

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I detta projekt presenteras ett arbete där en serieproducerad 5 cylindrig motor med gasdrift modifieras till drift på enbart en cylinder. En konceptstudie genomförs där för och nackdelar vägs mot varandra där sedan ett koncept implementeras. Tidigare lösningar har använts där avaktivering av cylindrar uppnåtts genom att ta bort komponenter till gasväxlingssystemet och med hål borrade i kolvarna. Motorn är tänkt att vid ett senare skede installeras i en test-cell på avdelningen för förbränningsmotorteknik på Kungliga Tekniska Högskolan.Oönskat kompressionsarbete i avaktiverade cylindrar minimeras genom att låta dessa ventilera mot atmosfären. Detta sker genom att plocka bort insugsventilerna och igentäppning av ventilstyrningar. Ventilation mot atmosfären sker med hjälp av ett modifierat insug. Ett system för att ta hand om olja som annars skulle ha förbränts i de avaktiverade cylindrarna konstrueras. Med denna lösning behöver inte den roterande massan modifieras vilket annars hade påverkat motorns balansering.Ett kapacitivt tändsystem där gnistenergi kan ändras under drift implementeras. Tändsystemet är uppbyggt av två stycken tändenheter och tändspolar som är kopplade till samma tändstift. Denna lösning tillåter bättre kontroll när multipla gnistor under en cykel är önskvärt. Motorn är tänkt att använda en experimentell styrning av tändning vilket kräver att tiden från när en gnista önskas till gnistinitiering minimeras.För kontroll av bränsle och tändning i ett initialt skede installeras ett eftermarknads motorstyrsystem. Detta styrsystem ansluts till motorns standard sensorer. Styrsystemet kan ändra relevanta driftparametrar under drift genom ett grafiskt gränssnitt, systemet inkluderar återkoppling för luft-bränsleblandning samt skyddsfunktioner för okontrollerad självantändning. Standardsystemet för avgasåterledning modifieras för att kunna styras av tidigare nämnt styrsystem.Hjälpaggregat och andra komponenter ej nödvändiga för drift i testcell demonteras. Motorn förbereds även så att en högtryckspump för direktinsprutning kan monteras i framtiden.
In this project, a 5-cylinder SI port-injected engine is converted to single cylinder operation by deactivating four of the cylinders. A concept generation process resulted in four different concepts where one of them was chosen to be implemented. Previous setups have been used before where cylinders have been deactivated by drilling holes in the piston.Unwanted compression work for the deactivated cylinders is minimized by allowing ventilation to the atmosphere. The inlet valves are removed and the inlet guides plugged. A modified intake connects the deactivated cylinders to the atmosphere. To manage the oil in the deactivated cylinders which otherwise would be combusted is routed to a manifold and finally a catch tank. With this setup, the rotating assembly is untouched thereby retaining the stock engine balance.A capacitive ignition system where the spark energy can be altered during operation is implemented. The ignition system is comprised of two separate ignition units and coils which is connected to the same spark plug. This setup allows full control of when the second spark is released when operated in a multi-spark mode. The system has been designed to minimize the time from spark demand to spark initiation. This is to prepare for future use where an experimental control algorithm will be used which doesn’t use traditional look-up tables.In an initial stage, the fuel and spark will be controlled by an aftermarket engine control unit. The system is installed using the standard sensors on the engine. The control unit can alter relevant parameters during operation using a graphical user interface. The system incorporates closed-looped lambda and knock control for safe operation. The stock exhaust gas recirculation system is incorporated with the engine control unit.Auxiliary units and other components not necessary for single operate are removed. The engine is also prepared to accommodate a high-pressure pump for future direct injection.

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Höglund, Filip. "Knock Detection in a Two-Stroke Engine to be Used in the Engine Management System." Thesis, Linköpings universitet, Fordonssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-104681.

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Engine knock has long been a well recognized phenomenon in the automotive industry. Detecting engine knock opens up the possibility for an indirect feedback of the engine's internal combustion without installing a pressure transducer inside the cylinder. Knock detection has mainly been used for spark advance control, making it possible to control the engine close to its knock limit in search for the optimal ignition timing. This application has to a lesser extent been applied to lightweight two-stroke engines, which is the focus of this study. The investigation features a modern chainsaw engine whose knock characteristics were first determined with a pressure transducer. The structural vibrations originating from the engine knock are filtered out of the signal from a remote located accelerometer. The knock intensity is compared with the signal from the pressure transducer which shows a correlation with an accepted extent between the two sensors. Parameters that affect the knock intensity have also been investigated. These include engine temperature, different types of fuel and ignition timings.

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Sides, Steve P. (Steve Paul) 1963. "Driving robust jet engine design through metrics." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/88331.

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Fleming-Dahl, Arthur. "A chaotic communication system with a receiver estimation engine." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15651.

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CATY, Fabien. "DESIGN OF SECONDARY AIR SYSTEM AND THERMAL MODELS FOR TRIPLE SPOOL JET ENGINES." Thesis, KTH, Kraft- och värmeteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-98875.

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This master thesis deals with the understanding of the secondary air system of athree spool turbofan. The main purpose is the creation of secondary air systemand thermal models to evaluate the behavior of this kind of engine architectureand estimate the pros and cons in comparison with a typical two spool turbofan. Afinite element model of the secondary air system of the engine has been designedbased on the experience of typical jet engines manufactured by Snecma. Theinner thermodynamic pattern and mass flow rates of the engine were obtained.Some local improvements were then made by making analogies with the enginesmanufactured by Snecma. After having communicated the results to theperformance unit to get updates thermodynamic cycles, a quite reliable model wasobtained and

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Rowles, Craig M. 1962. "System integration analysis of a large commercial aircraft engine." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9753.

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Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, 1999.
10912289
Includes bibliographical references (p. 93-94).
In this thesis we develop and demonstrate a method, called a System Integration Analysis, to produce a comprehensive understanding of the activities Integrated Product Teams (IPTs) perform in designing and developing a large complex product or system. The methodology is applied to an existing product or system whose physical architecture can be partitioned into comparable sections, or chunks, as the IPTs who design and develop it. Its goal is to identify specific integrative mechanisms to better align the Integrated Product Development (IPD) process and the organization with the product architecture. These mechanisms are then developed into specific recommendations in consideration of a strategic and tactical framework for achievement of the desired future state of the organization and its IPD process. Implementation of the initiatives is directed to a comprehensive change process defined to address the cultural, structural, and political reality of the company. The methodology uses two distinct applications of a Design Structure Matrix, and several complimentary approaches to the analysis of the data. The methodology is demonstrated with a world-class commercial high bypass-ratio turbofan engine, the Pratt & Whitney PW4098. This product is a derivative design of an existing configuration, or family of engines. Recommendations based upon the PW4098 application include specific interface management and system integration improvements, a minor organizational re-alignment, stronger discipline management, and clearly defined roles and responsibilities of key players.
by Craig M. Rowles.
S.M.

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Holmeros, Linus. "Data acquisition system for rocket engine hot fire testing." Thesis, KTH, Maskinkonstruktion (Inst.), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99495.

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ECAPS har utvecklat ett unikt drivmedel med tillhörande raketmotor för satellitstyrning som skall kunna ersätta Hydrazin, vilket idag är det vanligaste bränsle ombord på satelliter. Hydrazin är extremt giftigt och cancerogent. Det nya drivmedlet har 6 % högre specifik impuls samt 30 % högre densitetsimpuls jämfört med Hydrazin. Dessutom utgör ECAPS drivmedel en betydligt mindre risk för människa och miljö. Denna rapport innefattar en litteraturstudie om raketmotorer som används på satteliter samt hur testmiljön är uppbyggd av ECAPS där de utvecklar egna motorer. En motor beskrivs först generellt från bränsletank till dysutlopp och kompletteras med teoretiska härledningar av användbara begrepp. För vidareutveckling av nya raketmotorer har det befintliga motortestsystemet för få mätkanaler och begränsad samplingshastighet (2 kHz). Vidare är operatörsinterface och mjukvaran i behov av uppgradering samt att antalet kanaler behöver bli fler .Rapporten behandlar implementeringen av ett nytt mätsystem som är skrivet i Labview 8.6 vilket har gett en förbättring av t.ex. prestanda, stabilitet och gränssnitt. Samplingsfrekvensen är nu 10 kHz på 24 kanaler med marginal för utbyggnad upp till 40 kanaler, larmfunktioner finns på temperaturgivare och valfria analoga givare, gränssnittet är logiskt och mer ergonomiskt samt att spårbarheten för alla typer av körningar sparas i unika loggar.
ECAPS has developed a unique propellant with a rocket engine which can be used to control satellites and replace Hydrazin which today is the most common fuel onboard on satellites. Hydrazin is extremely toxic and cancerogenic. The new propellant offers 6 % better specific impulse and 30 % better density impulse compared to hydrazine. ECPAS´s propellant also provides significant lower risks for both man and environment. The report includes a literature study about rocket engines which can be used on satellites and how the test environment is arranged where ECAPS develops their engines. The rocket engine is first generally described and then complemented a theoretical derivation of common concepts. For further development of new rocket engines the present engine test system has too few sensor channels and limited sampling capability (2 kHz). The operator interface and software can be upgraded and the number of channels needs to increase. This report treats the implementation of a new test system which is written in Labview 8.6 and has improved for example performance, stability and interface. The sampling frequency is now 10 kHz on 24 channels with a margin for up to 40 channels, alarm functions exists on both temperature and multiple choice sensors, the user interface is logic and more ergonomic together with increased traceability for different types of tests which are saved in unique logs.

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Valenti, Carlo Alberto. "Development of a control system for an aeronautical engine." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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The goal of this thesis is to develop a control system for an aeronautical engine. In particular, the engine considered is an automotive one which will be adapted for aeronautical purposes. Therefore, the engine control unit is built in Simulink®, starting from a model in LabVIEW®. The purpose of this unit is to control the engine next cycle parameters and its setpoints. Then, in order to test its effectiveness a simplified engine model is built and the whole system is tested, after a first trial of the control system. The results are presented and discussed.

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Wu, Xiongnan Newman. "A Compositional Automation Engine for Verifying Complex System Software." Thesis, Yale University, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=13851930.

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Formal verification is the only known way of building bug-free or hacker-proof programs. However, due to its prohibitive associated costs, formal verification has rarely been considered as an option in building robust large-scale system software. Practical system software normally consists of highly correlated interdependent subsystems, with complex invariants that need to be globally maintained. To reason about the correctness of a program, we not only need to show that the program in consideration satisfies the invariants and the specification, but also prove that the invariants cannot be accidentally broken by other parts of the system, e.g., via pointer manipulation. Furthermore, we often have some snippet of code that temporarily breaks the invariants, and re-establishes them later, which could make reasoning of such code more complex. Even worse, many complex system software contains device drivers to work with the devices, which brings a major challenge of handling device interrupts; and consists of multiple threads running on multiple CPUs concurrently. This forces us to further reason about arbitrary interactions and interleaved executions among different devices, interrupts, and programs running on different CPUs, which could quickly make the verification task intractable.

In this dissertation, we present a compositional, and powerful automation engine for effectively verifying complex system software. It is compositional because it solely focuses on providing strong automation support for verifying functional correctness properties of C source programs, while taking the memory isolation and invariant properties as given, and separately provide a systematic approach for guaranteeing the isolation among different in-memory data, and proving invariants, completely at the logical level. The engine also contains a novel way of representing devices and drivers, and simulation-based approach for turning the low-level interrupt model into an equivalent abstract model which is suitable for reasoning about interruptible code. Furthermore, the engine provides a new way of representing concurrently shared states into a sequence of external UO events and allows us to verify concurrent programs as if they were sequential and provided a separate logical framework to effectively reason about interleaved executions. This very modular design allows us to be able to reason about each aspect of the system separately, and while each of the reasoning tasks looks unbelievably simple, we could combine all the proofs to obtain proofs of properties about complex system software. An OS kernel is a typical example of complex low-level system software with highly interdependent modules. To illustrate the effectiveness of our approach, using all the tools, we have developed a fully verified feature-rich operating system kernel with machine-checkable proof in the Coq proof assistant.

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Liu, Chunmeni 1970. "Dynamical system modeling of a micro gas turbine engine." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9249.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2000.
Also available online at the MIT Theses Online homepage .
Includes bibliographical references (p. 123).
Since 1995, MIT has been developing the technology for a micro gas turbine engine capable of producing tens of watts of power in a package less than one cubic centimeter in volume. The demo engine developed for this research has low and diabtic component performance and severe heat transfer from the turbine side to the compressor side. The goals of this thesis are developing a dynamical model and providing a simulation platform for predicting the microengine performance and control design, as well as giving an estimate of the microengine behavior under current design. The thesis first analyzes and models the dynamical components of the microengine. Then a nonlinear model, a linearized model, and corresponding simulators are derived, which are valid for estimating both the steady state and transient behavior. Simulations are also performed to estimate the microengine performance, which include steady states, linear properties, transient behavior, and sensor options. A parameter study and investigation of the startup process are also performed. Analysis and simulations show that there is the possibility of increasing turbine inlet temperature with decreasing fuel flow rate in some regions. Because of the severe heat transfer and this turbine inlet temperature trend, the microengine system behaves like a second-order system with low damping and poor linear properties. This increases the possibility of surge, over-temperature and over-speed. This also implies a potentially complex control system. The surge margin at the design point is large, but accelerating directly from minimum speed to 100% speed still causes surge. Investigation of the sensor options shows that temperature sensors have relatively fast response time but give multiple estimates of the engine state. Pressure sensors have relatively slow response time but they change monotonically with the engine state. So the future choice of sensors may be some combinations of the two. For the purpose of feedback control, the system is observable from speed, temperature, or pressure measurements. Parameter studies show that the engine performance doesn't change significantly with changes in either nozzle area or the coefficient relating heat flux to compressor efficiency. It does depend strongly on the coefficient relating heat flux to compressor pressure ratio. The value of the compressor peak efficiency affects the engine operation only when it is inside the range of the engine operation. Finally, parameter studies indicate that, to obtain improved transient behavior with less possibility of surge, over-temperature and over-speed, and to simplify the system analysis and design as well as the design and implementation of control laws, it is desirable to reduce the ratio of rotor mechanical inertia to thermal inertia, e.g. by slowing the thermal dynamics. This can in some cases decouple the dynamics of rotor acceleration and heat transfer. Several methods were shown to improve the startup process: higher start speed, higher start spool temperature, and higher start fuel flow input. Simulations also show that the efficiency gradient affects the transient behavior of the engine significantly, thereby effecting the startup process. Finally, the analysis and modeling methodologies presented in this thesis can be applied to other engines with severe heat transfer. The estimates of the engine performance can serve as a reference of similar engines as well.
by Chunmei Liu.
S.M.

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Ramirez-de-Arellano, Luis G. (Luis Guillermo) 1970. "Engine production system in the US defense aircraft industry." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50530.

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24

Sharad, Kittur Rohan. "Heavy-Duty Spark-Ignited Single Cylinder Engine Fueling System." Thesis, KTH, Maskinkonstruktion (Inst.), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232481.

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Forskning inom motorutveckling bedrivs för att möta kommande emissionskrav och samtidigt minska bränsleförbrukningen. Kommande förbud mot dieseldrivna fordon planeras i flera städer runt om i världen. Alternativa bränsle som exempelvis naturgas ses som en lovande ersättning även för tunga fordon. Metan som är huvudkomponenten av naturgas har en fördelaktigt förhållande mellan väte och kol vilket gör den attraktiv för CO2-reducering. Hur som helst, bränslets låga cetantal och den höga aktiveringsenergin som krävs för att tända naturgas förutsätter tändstiftsantändning.En fördel av att använda en encylindrig motor inom forskning är möjligheten att studera fenomen utan negativa gasväxlingsinteraktioner från intilliggande cylindrar. Jämfört med en fullmotor möjliggörs även ett snabbare utbyte av motordelar samt lägre bränsleförbrukning.Fokus för detta examensarbete var genomförandet av ett flexibelt bränslesystem för en tändstiftsantänd encylindrig motor. Motorn är en tändstiftsantänd Scania 9 liters som modifieras för encylinder körning. Flexibilitet som t.ex. laddningshomogenitet, selektiv fyllning av inloppsporter och förberedelser för direktinsprutning av flytande bränsle realiserades. För enkel användning är motorn styrd av en eftermarknadsmotorstyrenhet som använder ett användarvänligt grafiskt gränssnitt för ändring av driftsparametrar. Säkerhetshänsyn vid blandning av gasformiga bränsle och luft långt innan inloppsporterna har implementerats.
Most of the fundamental research in internal combustion engines is driven by the ever-increasing stringency of emissions regulations along with the need for increased fuel economy. The proposed ban on diesel vehicles in several cities around the world combined with extensive availability, has made natural gas a promising substitute even for heavy-duty applications. The high hydrogen-to-carbon ratio of methane, the major component of natural gas, makes it attractive from an emissions reduction perspective. CO2 emissions from natural gas combustion are particularly low. However, the low cetane number and high activation energy required to ignite natural gas, requires spark-ignition.In a research setting, it is often advantageous to have a single cylinder engine. The main benefit is the ability to study phenomena without adverse interactions which multi-cylinder operation may cause. This is especially important for gas-exchange studies. Quicker replacement of parts and lower fuel consumption are secondary benefits.The focus of this thesis was the implementation of a flexible fueling system for a single cylinder spark-ignited engine. The engine is a Scania 9-liter spark-ignited engine modified for single cylinder operation. Flexibility in terms of charge homogeneity, selective intake port filling and provisions for liquid fuel direct injection have been provided. For ease of use, the engine is controlled by an aftermarket engine control unit with a graphical user interface for configuration. Safety considerations when mixing gaseous fuels and air well upstream of the intake ports have been implemented.

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Sastry, Sudeep. "A Thermoacoustic Engine Refrigerator System for Space Exploration Mission." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1301588899.

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26

Bucknell, Roger John. "Control system for a gasoline engine including dual spark." Thesis, University of Hertfordshire, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314566.

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27

Swift, Stuart John. "Applicability of hybrid methods in engine control system design." Thesis, University of Cambridge, 2009. https://www.repository.cam.ac.uk/handle/1810/265493.

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The new control techniques of off-line model predictive control and level set methods have been applied to the challenges of engine management for diesel exhaust aftertreatment. Theoretical work has been supported by experiments carried out in a diesel engine test cell. A control relevant air-path model was developed using experimental work carried out on a diesel engine and dynamometer, with the aim of improving the engine control during the transients required by aftertreatment devices. This was considered as a two input and two output system, using an intake throttle and a valve associated with the exhaust gas recirculation system to control the in-cylinder quantities of fresh air and exhaust gas. Model predictive control techniques were used to design a hybrid controller, which was compared to a traditional proportional and integral controller and a 1-{00 controller in simulation. Level set methods were used to analyse supervisory hybrid control of a lean NOx trap model. In this system periodic mode changes are required to purge the NOx trapped on the filter and convert it to less harmful products. A novel diesel particulate filter model suitable for control was developed to represent the thermal wave behaviour observed in worst-case regenerations, where the soot in the filter burns to create local high temperature regions. A DPF was instrumented and fitted to the diesel engine and tested in the development of this model, particularly focusing upon these worst-case conditions. This new theoretical model was analysed using level set methods in a comparison with a simple control oriented DPF model. A supervisory hybrid control strategy to determine when to take emergency action to avoid thermal damage to the filter was designed using the simple DPF model. This strategy used safe conditions verified from the experimental work undertaken.

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Sandvik, Joel Emil. "Scaling an Optimization Engine for a Decision Support System." Thesis, Mittuniversitetet, Avdelningen för informations- och kommunikationssystem, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-20441.

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The objective of this survey has been to determine whether an existing linearprogramming model could be used to implement a system for the optimizationwith regards to the matching of transports and requests. Realdata from Härnösands harbour was enhanced and used to simulate scenariosthat would be used and applied within the system. The LINGOsolverwas integrated within a system that was developed in .Net to addressissues around data in- and output, data persistence, and stability.Performance tests revealed that the system and model performed inadequatelyon larger datasets. A simpler model was developed that handlea subset of the types of datasets handled by the first model, a subsetwhich includes the data collected from Härnösand harbour. The simplermodel was implemented with the AMPL/CPLEX-solver software, and furthertests showed that this provided a much improved performance to thesystem. These results indicate that further investigation might be requiredregarding the differences in performance between combinations of differentsolvers and models, and that a complete and production ready systemis likely to benefit from incorporation of various models that can be appliedto various characteristics of the input data.

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Moro, Mike, and Paul J. Friedman. "An Integrated Real-Time Turbine Engine Flight Test System." International Foundation for Telemetering, 1990. http://hdl.handle.net/10150/613817.

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International Telemetering Conference Proceedings / October 29-November 02, 1990 / Riviera Hotel and Convention Center, Las Vegas, Nevada
New developments and modifications to existing gas turbine engines require qualification through extensive ground testing followed by flight testing. An increasing work load necessitates productivity improvements in the test platform utilization and the telemetry ground station. This paper addresses the application of a compatible family of commercial offthe-shelf telemetry systems for quick-look to ensure data integrity on board the Boeing 720 test platform, and a distributed architecture ground station to serve multiple engineering disciplines through the use of an acquisition subsystem serving data to independent color graphics workstations via an Ethernet local area network.

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Hague, Douglas C. (Douglas Charles) 1967. "Description of a turbofan engine product development process." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/29164.

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Thesis (S.M.)--Massachusetts Institute of Technology, System Design & Management Program, 2001.
Includes bibliographical references (p. 123-125).
This research explores what requirements are necessary for the development of a turbofan engine and how they evolve through the product development cycle. This work utilizes a parameter-based design structure matrix (DSM) to define the interfaces and interdependencies present in a large commercial aircraft propulsion system. The DSM was developed from the system level to the module level allowing one to examine the assumptions made throughout the entire life cycle of the product. The work utilizes the system-level DSM to show the similarities between the turbofan engine product development process (PDP) and the software spiral product development process. This work examines the parameter-based DSM in each of the design phases and attempts to understand the assumptions made in each phase and how the assumptions change as the product proceeds through the development cycle. By examination of the DSM, it was found that program goals and requirements lead to an initial set of design parameters. These design parameters are then iterated until a satisfactory product defamation is developed. Each stage concludes with the integration and testing of that stages work. In all stages risk management occurs and with the necessary revision of the program plan for subsequent stages (not in the system-level DSM). The work shows that the PDP for a turbofan engine can be viewed as a spiral process. The thesis then suggests that, in general, the current industry practices for the development of complex physical systems have similarity to the spiral framework for development of software.
by Douglas C. Hague.
S.M.

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Moy, Habs M. (Habs Mern) 1967. "Commercial gas turbine engine platform strategy and design." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/88328.

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Follen, Kenneth. "A System Dynamics Modeling Methodology for Compressible Fluid Systems with Applications to Internal Combustion Engines." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1281971505.

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33

McCauley, Bob. "Expert Systems in Data Acquisition." International Foundation for Telemetering, 1987. http://hdl.handle.net/10150/615229.

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International Telemetering Conference Proceedings / October 26-29, 1987 / Town and Country Hotel, San Diego, California
In an Independent Research and Development (IR&D) effort, the Telemetry Systems Operation (TSO) of Computer Sciences Corporation (CSC) sought to determine the feasibility of using Artificial Intelligence (AI) techniques in a real-time processing environment. Specifically, the use of an expert system to assist in telemetry data acquisition processing was studied. A prototype expert system was implemented with the purpose of monitoring F15 Vertical Short Take Off and Landing (VSTOL) aircraft engine tests in order to predict engine stalls. This prototype expert system was implemented on a Symbolics 3670 symbolic processor using Inference Corporation's Artificial Reasoning Tool (ART) expert system compiler/generator. The Symbolics computer was connected to a Gould/SEL 32/6750 real-time processor using a Flavors, Inc. Bus Link for real-time data transfer.

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34

Assanis, Dennis N. "A computer simulation of the turbocharged turocompounded diesel engine system for studies of low heat rejection engine performance." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15089.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1986.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.
Bibliography: leaves 135-140.
by Dionissios Nikolaou Assanis.
Ph.D.

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35

Boulanger, Yves. "A microprocessor system for internal combustion engine PV diagram analysis /." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61266.

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An internal combustion engine was instrumented in view of developing automatic diagnosis methods based on the analysis of PV diagrams.
The pressure signal is unstable over successive cycles. Consequently, pressure must be averaged over several consecutive cycles to produce valid data.
Due to instrumentation problems the data obtained was insufficient to allow the development of diagnostics. The investigation reported in this work is thus limited to the development of a microprocessor-based system for the acquisition of pressure-volume data on high speed, spark ignition internal combustion engines.
Several instrumentation problems were identified and solutions applied or proposed. The information presented here can form the basis for further research on the original project.

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36

Johansson, Thomas. "System analysis of a diesel engine with VGT and EGR." Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5438.

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To fulfil emission requirements specified by environment demands, such as Euro 4 and Euro 5, there is a need to utilize engines based on technologies such as Variable Turbine Geometry (VGT) and Exhaust Gas Recirculation (EGR). A model of an engine using VGT and EGR was created by Ph.D student Johan Wahlström at Linköping University. This thesis evaluates Wahlström's model and shows how it successfully describes the engine and its behaviour. The thesis also confirms theories about the occurrens of non.minimum phase behaviour in different transfer functions, e.g. from VGT signal to the mass flow through the compressor.

An interesting phenomenon when applying VGT and EGR is a nonlinearity leading to, for example, that the same pressure in the intake manifold can occur for two different VGT signals. Such phenomenon can cause problems when designing a control system. Furthermore, this nonlinearity also results in a replacement of the nonminimum phase behaviour with an overshoot when a large (above 80%) VGT control signal is used.

This thesis also provides a linearized model, which describes the engine satisfactory. The linearization results in transfer functions with two zeros and three poles, whose locations do not change much when varying engine speed and load (except at high load and low engine speed). This fact will most likely make it possible to utilize just a few different linearizations for all speeds and loads. However, altering VGT and EGR positions greatly affect the transfer functions. Thus, several linearizations are probably needed to cover all operating points.

When designing a future control system a good strategy is to utilize a decoupled system since the model has strong cross-connections. Another solution would be to apply multi dimensional control strategy, e.g. LQ-theory.

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Austin, Paul Baden. "Towards a file system for a scalable parallel computing engine." Thesis, University of York, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304159.

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38

Bai, Mo, and Mahabaleshwar Sagar Parampalli. "Accelerated Engine Suspension Load Prediction and Exhaust System Displacement Simulation." Thesis, KTH, Maskinkonstruktion (Inst.), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-218029.

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In today’s competitive automotive industry, most companies are trying to make their new designs and features implemented in their products to be ahead of their competitors. However, in the preliminary design stage of CEVT vehicles, dynamic simulation consumes excessive amount of time depending on the complexity of the dynamic model and simulation settings. It is beneficial and possible to shorten the simulation time. This thesis focuses on reducing the dynamic simulation time in ADAMS/Car in engine suspensions’ early development stage. Five simulation time reducing methods, i.e., reducing end time in driver control maneuver, stopping similar simulations, converting specific flexible parts to rigid parts, properly increasing the step size and performing simulation for engine suspension subsystem instead of the full vehicle system, were proposed and investigated separately to study their effects on the simulation time and the accuracy of the fatigue damage results of the engine suspension. With the proper combination of the five methods, total dynamic simulation time was effectively reduced to 61% and the variation of fatigue damage results of each engine suspension component was controlled within 30%. Dynamic modelling of an exhaust system is also included in this thesis and it provides referential data for the packaging design of exhaust system.
I dagens konkurrensutsatta bilindustri försöker de flesta företag att göra sina nya mönster och funktioner implementerbara i sina produkter för att vara före sina konkurrenter. I det preliminära konstruktionsstadiet av CEVT-fordon förbrukar dynamisk simulering dock en stor tid beroende på komplexiteten hos den dynamiska modellen och simuleringsinställningarna. Det är fördelaktigt och möjligt att förkorta simuleringstiden. Denna avhandling fokuserar på att minska den dynamiska simuleringstiden i ADAMS / Car i motorupphängningens tidiga utvecklingsstadium. Med hjälp av bakgrundsstudier och erfarenheter från CEVT’s personal provades fem olika sätt att minska simuleringstiden, samtidigt som simuleringsresultatens noggrannhet kontrollerades. Varje metod användes separat i simuleringen för att studera effekten på resultatens noggrannhet. I slutet kombineras alla metoder i simuleringen för att få bästa möjliga simuleringstid utan att förlora noggrannhet. Genom att kombinera de fem metoderna reducerades den totala dynamiska simuleringstiden till 61% och variationen i utmattningsskadans resultat av varje motorupphängningskomponent kontrollerades inom 30%. Dynamisk modellering av ett avgassystem ingår också i denna avhandling, vilket ger referensdata för framtida förpackningsdesign av avgassysteme

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Anzalone, Thomas M. "Heat transfer characteristics of a fluidized bed : stirling engine system." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1291128389.

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40

Korres, Michael. "Cylinder Pressure Sensor based Engine Combustion and Fuel System Diagnostics." Thesis, KTH, Fordonsdynamik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-203351.

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Nowadays, the developed diagnostics models and software are not capable of locating the root cause of an emerging malfunction, or in other words the responsible component, while the vehicle is up and running. In most cases they are solely able to provide the driver with indications that a fault has been detected within a group of components. Subsequently, it is unavoidable that the vehicle returns to the workshop for a number of standardized tests to be performed, in order to evaluate the condition of the potentially faulty components. The new era in combustion engines and the attempt to fully incorporate closed-loop combustion control can facilitate the diagnostics procedure and especially the process of fault isolation. By harnessing signals from both real and virtual sensors, it can be feasible to diagnose or even prognose faults, averting the return of the vehicle to the workshop. Moreover, the down-time of the vehicle, can be radically decreased, since there will be an indication on which components to focus. Taking into account the fastpace steps and improvements on the respective hardware, such as sensors, one can understand that this endeavour can actually be successful in the future. In the spectrum of this thesis it is assessed whether or not fault detection and isolation can be achieved, through comparison of sensors’ output signals for a number of engine parameters to a stored set of nominal values for these parameters (reference values). Towards that goal, virtual sensors have been developed with the aid of measurement data, in order to increase the reliability of the system. Subsequently, a network of dependencies between parameter values and consequent malfunctions has been constructed, in the form of flowcharts, rudimental for fault isolation. In addition to that and despite the fact that no finalized production code for the model is provided, pseudocode charts have been created as well. Finally, significant effort was made to derive precise tolerances for the reference values, as this is of great importance for the results of the diagnostics model.

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41

Almeida, Fernando Jorge Gonçalves, and João Pedro Brás da Cruz. "Cooling System Analysis." Master's thesis, 2012. http://hdl.handle.net/10316/20538.

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Dissertação de Mestrado em Engenharia Mecânica apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra
ABSTRACT This master thesis report describes the behavior of a cooling system based on the power consumption and power losses during the velocity range. The thesis is a report of the behavior of the cooling system to understand were we having more needs to cold down the system. It was used a excel sheet to describe the values of power, losses and efficiencies of the various components of the cooling. With the excel sheets built we studied various cases in the system to show the points more important to take care with the cooling system. Continuing the study, it was showed the power consumptions of the cooling system and also the heat dissipation capacity. The objective included in this thesis is to show that in the regular cooling systems the use of the engine's velocity to move the fan and the coolant pump is not the best choice. Could be currently the less expensive one,but not the best one. This thesis didn’t have the objective to find a solution for a perfect cooling system, but a good report of the problems of the actual cooling systems and where we should spend more time to improve them. This is just a preparatory work for a new work.

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42

Lin, Hsin-Chuan, and 林信傳. "Design and Verification for Engine Management System of EFI Scooter Engines." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/zvyx3r.

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碩士
國立臺北科技大學
車輛工程系所
95
The purpose of this thesis is to develop an engine management system (EMS) for scooter engine to improve fuel consumption and exhaust emissions. The proposed EMS is consisted of engine operation mode switch, fuel injection, ignition, and idle speed control (ISC) strategies. The engine operation mode switch strategy is used to judge current state of the engine, such as key on, run, idle, fuel cut off, etc. the fuel injection control strategy is designed to control the injection duration and start injection angle based on engine operation conditions, such as engine speed, intake manifold pressure, etc. The ignition control strategy is utilized to control the magnetization time and ignition timing at optimal operating points. The ISC strategy is employed to control the airfuel ratio, carbon deposition, ambient pressure compensation, ignition timing, etc. The Motortron is used as a hardware ECU for developing ECU-based rapid-prototype system and for designing engine control strategy. The MATLAB/Simulink Model-Based is employed as a control strategy development platform. Finally, the Mototune is utilized as an engine calibration tool to regulate the injection and ignition control parameters at engine dynamomoter and chassis dynamomoter. The preliminary experimental results show that the vehicle acceleration, fuel consumption and engine performance of the proposed algorithm including transient and steady state tests are close to the original performance of the scooter.

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43

施翔耀. "Engine-Hanger System for Scooters." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/50644629679868787814.

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碩士
國立中山大學
機械工程研究所
85
Engine-hanger system is an important mechanism for the riding safety and comfort of scooters. The purpose of this research is develop a systematic design process for the allocation of engine-hanger systems to increase the comfort. First, the conceptual design of the configurations of engine-hanger systems is done by a systematic structural synthesis method, an atlas of engine-hanger systems with six and eight links is successfully constructed. Next, the balancing design of a single cylinder engine is accomplished. Then, the new balance position of the engine-hanger system under a load is determined by the principle of virtual work. Based on the concepts of orthogonality theory and virtual center of percussion, four feasible design concepts of the engine-hanger system of scooters are proposed. Finally, a multi-body modeling is proposed to simulate the engine-hanger system of scooters, and the dynamic response and acceleration of the seat are analyzed. Refer to hanger rotation analysis and acceleration analysis of the seat, the performance of design works is analyzed and compared. In this study, we can obtain potential arrangement design of Engine-Hanger System.

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Peng, Yu-Wen, and 彭郁文. "Development of Torque-Based Engine Management System for Range Extender Engine." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/f942n7.

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碩士
國立臺北科技大學
車輛工程系所
100
Due to the energy crisis , an Electric Vehicle with Range Extender is regarded as the solution of short distance of the electric vehicle , this thesis would like to develop a range extender engine which has Semi-direct Injection (SDI) system and uses cheaper liquified petroleum gas (LPG) as the fuel . A torque-based engine control system described in the thesis uses a control demand to control and satisfy torque requirement. This torque demand is the result of power management strategy, so the engine management system must include the function of receiving and achieving the torque demand. This thesis uses a SDI engine and keeps it in lean-burn to find the best ignition timing, excess air ratio and the engine map, than finds 2 best operating point of the engine: The first is the point which has high torque and lowest fuel consumption; the other one is considerate of noise vibration harshness , so a lower speed and torque is the second operating point. The thesis also use an engine model by Matlab/Simulink to simulate the control strategy, finally the verification of the algorithm by engine experiment. The result shows that the torque-based engine control algorithm makes the engine run at the best operating point steadily, which opens up potential for improvement high efficiency and reduction in fuel consumption

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45

Narayanaswamy, Kushal. "DI-HCCI engine control system development." 2006. http://www.library.wisc.edu/databases/connect/dissertations.html.

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46

Su, Chien-Ying, and 蘇建穎. "Stirling engine geothermal power generation system." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/52816170358246455557.

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碩士
萬能科技大學
工程科技研究所
100
Because the world of excessive use of fossil fuels, and excessive use of fossil fuels produce carbon dioxide and the greenhouse effect as a result of climate change a serious problem, therefore, the development of green energy is very urgent, geothermal is a natural green energy, the use of geothermal for power generation is the future research direction. In this paper, we actually produce a large size of the Stirling engine, geothermal generators, field testing, access to important information when the actual operation and experience, as well as related results can be used for solar power. The low temperature difference Stirling engine, the choice of materials and design have a lot of flexibility, so we can optimize as much as possible, so it has some potential for development, the low temperature difference Stirling engine can be used In the heat pipe-based solar power, can also be used in geothermal power generation. Stirling engine geothermal power compared to other models, the existing geothermal power generation technology, there are many advantages, can be high for the spa water temperature is not the case, you can smoothly, so the Stirling engine used in geothermal power is a good choice. We actually design a Stirling engine, a large-scale geothermal power, and geothermal valley in Beitou a month field test, the experimental results confirmed that a Stirling engine, geothermal generators, able to meet our design requirements, according to the experimental test results, our laboratory has also produced a smaller temperature difference Stirling engine, plus we use a modified hot tube, round container and improved heat dissipation, maintaining the temperature difference Stirling engine, quite good.

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Chen, Jian-Syong, and 陳建雄. "Design Optimization of Engine Mount System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/58762526145545146963.

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碩士
國立宜蘭大學
機械與機電工程學系碩士班
101
In this research, ADAMS engineering software was used to create the power model of automobile engine mount system. The vibration reduction analysis for an original engine mount system was performed to calculate the vibration modes and the corresponding frequencies. The energy distribution was calculated as well. The major optimization purpose was to have the torque roll axis approach the elastic axis. Based on the dynamic simulation analysis, two optimization steps for engine mount system were performed. After optimization, full automobile model with 13 degrees of freedom was created to calculate the reaction force at idle condition. After optimization, the torque roll axis was consistent with elastic axis and the decoupling level in system principle direction was significantly increased, the vibration frequencies were decreased, and the reaction force was reduced at idle condition. Keywords: Engine Mount System, Decoupling, Torque Roll Axis, Elastic Roll Axis

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48

林佳明. "Expert system maintenance for aircraft engine." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/80356305251572340768.

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碩士
建國科技大學
自動化工程系暨機電光系統研究所
98
Generally the maintenance crew compare the malfunction symptoms with fault isolation items of the technical manual to do the engine examination, but, many of the malfunctions are unpredictable and can not be found in the design, and this kind of service needs experienced specialized engineer to provide the domain knowledge. In this study, the virtual configuration of the aircraft engine cold section was chose as object of the study, according to the aircraft engine, 80% malfunctions can be classified as gas path, and based on the existing maintenance of experience and information, rule-based knowledge and case-based knowledge has built. The occurrence of all failure and results compile its own regular pattern. By using software into knowledge base, a combination of artificial intelligence expert system technology to speed up the diagnostic process has been developed. Therefore by this software, it can achieve convenient and rapid fault diagnosis and improve the quality of aircraft maintenance to ensure flight safety.

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49

Schneidewend, Dan. "A custom digital engine control system." 1992. http://catalog.hathitrust.org/api/volumes/oclc/25896872.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1992.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 33-34).

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50

Sue, Yanren, and 蘇筵壬. "Optimization Control Study of Engine Management System for Direct InjectionCommon Rail Diesel Engine." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/16151218503116481064.

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碩士
大葉大學
機械與自動化工程學系
99
The main purpose of this study is to establish a simulation and analysis methodology for multi-cylinder four-stroke direct-injection common-rail diesel engine management system and to verify the dynamic performance response. The hardware and software of the engine control were combined to display real-time performance parameters with the engine control parameter tuning and multi-objective optimization rules and to verify the engine performance by dynamometer experiments. This study has built the search program for multi-cylinder four-stroke common rail direct injection diesel engine multi-objective goal attainment optimization control parameters. The fuel consumption and pollution of vehicle driving cycle was converted into engine torque and speed by using the real vehicle parameters. Several key points were sorted from the corresponding map data for steady state estimation measurement. The selected key points control parameters were changed to reduce the overall exhaust emissions. Simulation module and combustion analysis models were used to explore injection pressure, injection timing and the injection duration of engine management system. Engine torque, speed and the relationship between the response of pollutants in the exhaust were optimized and compared with the baseline engine measurement data. Real-time display and record of the engine hardware and software parameters, and control parameters under different engine operating conditions were measured. The engine combustion heat release and its rate were calculated by using engine combustion pressure data and validated with combustion analyzer under different engine operating conditions. The dynamic relationship between control and the response data can be used as future reference for developing of engine management systems. By experimental design and multi-objective optimization search, the experiments time and expanse can be reduced and the efficiency of engine parameters calibration and adjustment can thus be improved.

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Dissertations / Theses on the topic 'Engine system'

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