Global ETD Search

1	Kinetic Art Table : Polar sand plotter Türk, Serhat, Müller, Kristoffer January 2021 (has links) CNC machines are used with plenty of different implementations, one of which is in this project where a polar CNC machine was used to draw mesmerizing patterns on a table with fine sand. This construction read G-code and converted it to polar coordinates. The capabilities of what the plotter could draw were tested, everything from ODE plots to custom-made patterns and drawings with the help of Sandify. Although the patterns were drawn properly with small errors the ODE was too difficult to draw because it required a smaller magnetic ball and an even more precise system than what was used. This machine also generated noise at roughly 33 dB when it was in use. / CNC-maskiner används med massor av olika implementationer, en av dem är i det här projektet där en polar CNC maskin användes för att rita fascinerande mönster på ett bord fylld med fin sand. Denna konstruktion läste in G-kod och konverterade det till polära koordinater. Förmågan av vad maskinen kunde rita testades, allt från ODE grafer till specialtillverkade mönster och ritningar med hjälp av Sandify. Aven om de olika mönstren ritades ordentligt men med mindre små fel var ODE för svårt att rita på grund av att det krävde en mindre magnetisk kula och ännu mer noggrannhet jämfört med detta system. Denna maskin alstrade också ljud på cirka 33 dB under användning. Mechatronics Stepper-motor Arduino Polar plotter forward Euler method Mekatronik Steg-motor Arduino Polär plotter Eulers stegmetod Mechanical Engineering Maskinteknik
2	Feed-Forward Air-Fuel Ratio Control during Transient Operation of an Alternative Fueled Engine Garcia, Andrew Michael 09 August 2013 (has links) No description available. Mechanical Engineering Automotive Engineering air-fuel ratio control tailpipe emissions reduction feed-forward air-fuel ratio control model-based calibration intake manifold modeling Forward Euler approximation
3	Moment Matching and Modal Truncation for Linear Systems Hergenroeder, AJ 24 July 2013 (has links) While moment matching can effectively reduce the dimension of a linear, time-invariant system, it can simultaneously fail to improve the stable time-step for the forward Euler scheme. In the context of a semi-discrete heat equation with spatially smooth forcing, the high frequency modes are virtually insignificant. Eliminating such modes dramatically improves the stable time-step without sacrificing output accuracy. This is accomplished by modal filtration, whose computational cost is relatively palatable when applied following an initial reduction stage by moment matching. A bound on the norm of the difference between the transfer functions of the moment-matched system and its modally-filtered counterpart yields an intelligent choice for the mode of truncation. The dual-stage algorithm disappoints in the context of highly nonnormal semi-discrete convection-diffusion equations. There, moment matching can be ineffective in dimension reduction, precluding a cost-effective modal filtering step. modal truncation model reduction moment matching dual-stage dimension reduction Lanczos Arnoldi smoothness discrete smoothness Laplacian heat equation convection-diffusion initial boundary value problem Fourier series coefficient decay semi-discrete explicit integration forward Euler linear, time-invariant system.

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