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 56 for “"throttling"”.
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Modeling and Runtime Systems for Coordinated Power-Performance Management
… In this dissertation, we focus on three throttling techniques: CPU dynamic voltage and frequency scaling (DVFS), dynamic memory throttling (DMT), and dynamic concurrency throttling (DCT). We first conduct an empirical analysis of the performance and energy trade-offs of different …
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ΘΕΩΡΗΤΙΚΗ ΚΑΙ ΠΕΙΡΑΜΑΤΙΚΗ ΕΡΕΥΝΑ ΤΗΣ ΜΟΝΙΜΗΣ ΚΑΙ ΜΕΤΑΒΑΤΙΚΗΣ ΛΕΙΤΟΥΡΓΙΑΣ ΤΟΥ ΚΙΝΗΤΗΡΑ ΝΤΗΖΕΛ ΜΕ ΣΤΡΑΓΓΑΛΙΣΜΟ ΤΗΣ ΕΞΑΓΩΓΗΣ
… FOLLOWED BY THE STUDY OF THE EFFECT OF EXHAUST THROTTLING ON THE STEADY AND TRANSIENT OPERATION OF THE DIESEL ENGINE (IN THEORY AND EXPERIMENTALLY). TEMPERATURE RESPONSE OF THE TRAP AND INTERVENINGPARTS BETWEEN ENGINE AND TRAP IS STUDIED IN THE SEQUEL, IN ORDER TO OPTIMIZE FORCED REGENERATION ON …
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Experimental investigation of an ejector as a refrigerant expansion engine
… harnesses kinetic energy developed during the throttling process and returns it to the compressor in the form of a pressure boost. An ejector was designed taking into account the expected nonequilibrium behavior in the motive nozzle, and assuming equilibrium conditions in the other components. …
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Study of Active Valve Timing on Efficient Hydraulic Piston Motor Operations
… closing can be significant, causing transitional throttling loss and reducing the energy efficiency. The goal of this thesis is to provide a fundamental understanding of the role of valve timing and propose a viable active valve solution for better efficiency of hydraulic pumps and motors. …
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Aeolous Innovations: The Sonivent Automated HVAC Heating/Cooling Register
… or cooling that room. It is also efficient by throttling the air flow
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Achieving Efficient Control of Hydraulic Systems Using On/Off Valves
… due to the typical method of control, which uses throttling valves to place restrictions in the flow path to dissipate excess power as heat. Several approaches to reducing throttling losses have been studied, such as using pumps, motors, or transformers to control individual actuators, or creating …
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Investigation of Methods and Devices for Active Thrust Profile Control in Hybrid Rocket Engines through Oxidiser Flow Management
… engine, capable of producing 500N of thrust. Throttling is achieved by using a ball valve as the throttle mechanism.<br/><br/>Advanced modelling techniques, including MATLAB/Simulink and ANSYS FLUENT, were employed to analyse engine dynamics and the effects of varying oxidiser mass flow rates, …
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Net neutrality repeal : another rock on the road of a suffering music genre
… service providers from blocking content, throttling speeds or charging more for faster Internet. Repealing that regulation will have multiple effects in all industries that use the Internet, music included. Experts believe that without Net Neutrality, independent artists will struggle to …
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Design and performance evaluation of a rotary flow control valve for independent metering hydraulics.
… speed. The speed control occurs through throttling, which causes large power losses. Moreover, the substantial flow forces acting on the throttling parts of the valve in high flow rate regimes has resulted in the application of sophisticated multi-staged servo valves. An alternative …
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Energy-aware Thread and Data Management in Heterogeneous Multi-Core, Multi-Memory Systems
… I study the effect of dynamic concurrent throttling on the performance and energy of multi-core, non-uniform memory access (NUMA) systems. I use critical path analysis to quantify memory contention in the NUMA memory system and determine thread mappings. In addition, I implement a runtime …
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Design and development of a microwave-enhanced diesel soot oxidation system
… successful. These methods include exhaust throttling, fuel catalysis, filter catalysis, electrical heating, and burner systems. One very unique regeneration method incorporates the use of microwave energy to selectively heat the particulate matter within diesel PM filters. In the research …
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Determination of the effectiveness of a Hot Tube igniter for initiating HCCI combustion
… operated overall fuel-lean and therefore has no throttling losses and near zero NOx emissions. The mixture is also compression ignited in the same way as in a CI engine. This causes combustion to occur simultaneously throughout the combustion chamber and thus no flame front is present.
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An experimental study of supercritical CO2 flow in pipes and porous micro-models for carbon sequestration applications
… the classical Moody chart. Also, Joule-Thomson throttling was studied using a 0.36-mm-diameter orifice. For conditions relevant to carbon capture and sequestration, the fluid underwent Joule-Thompson cooling of approximately 0.5°C/bar. The temperature difference during the cooling increased with …
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Simulation of a power station's condensate pumping system in view of improving its efficiency
… control is implemented by conventional valve throttling of the discharge valve of these pumps. This type of flow control is uneconomical, as more than 30 of the flow – and the pressure – that can be supplied by the CEPs, is throttled under normal operating conditions. As an energy-efficiency …
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Towards Electrical Control Over Rocket Propellant Combustion
… burn rate modulation has the potential to enable throttling. In spacecraft propulsion systems, electrolysis of propellants may provide a means to reduce energy requirements and eliminate the need for expensive catalysts. The work presented in this thesis is concerned with fundamental science …
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An experimental investigation of unsteady separation shock wave motion in a plume-induced, separated flowfield
… the presence of a 0.5-inch thick base height. By throttling the stagnation pressure of the inner-jet flow, PIBLS flowfields, with nominal separation point locations ranging from two (JSPR $\approx$ 1.7) to six (JSPR $\approx$ 2.3) or more boundary layer thicknesses upstream of the base plane, were …
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The design of a prototype Otto-Atkinson engine and evaluation of the part load fuel efficiency
… rather than by the more conventional method of throttling the induced fuel-air mixture. Thus the pumping losses associated with throttled part-load operation are eliminated. Furthermore, the expansion stroke is always greater than the compression stroke, the difference being greatest at part …
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Understanding HCCI characteristics in mini-HCCI engines
… out and discussed. The engine’s use of inlet throttling, crankcase pumping and residual exhaust gas metering is modelled and discussed. In addition, the engine’s inherent ability to maintain constant combustion phasing over varying operating conditions is also investigated.
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Intelligent runtime tuning of parallel applications with control points
… frequency of load balancing, and a communication throttling parameter.
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