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 172 for “"overshoot"”.
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Experimental study of electron velocity overshoot in silicon inversion layers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Development of dc-dc converter for dc motor using fuzzy logic controller
… on, the start dc motor speed will experience overshoot at the starting speed of the motor. This overshoot will affect the current rise high as if connected to a load. The use of conventional controllers has long been used to control the dc motor and reduce overshoot starting. Fuzzy logic …
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Effects of varying inertial load on human wrist movement
… the effects of increased load on target overshoot, maximum acceleration and speed, and hand tremors were tested. The frequency content seen in the natural speed trials was found to resemble a normal distribution. This higher area of frequency content could potentially correlate with the …
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Improved dynamic structural analysis for linear and nonlinear systems
… convergence, dissipation, dispersion and overshoot behavior. These algorithms have minimum order of accuracy two, and maximum order of accuracy four. In general, they have order of accuracy three. All the algorithms are unconditionally stable, do not overshoot in displacements or in …
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Precision hybrid pipelined ADC
… contributing to the first phase error, known as overshoot error. Overshoot error reduction at the end of the first phase improves the linearity requirements of the final phase. Automated background overshoot reduction is introduced though not included on the prototype ADC. A prototype ADC was …
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AC motor speed performance improvement using fuzzy logic control
… the rise time, settling time, peak time and overshoot to 0.10s, 0.17s, 0.29s and 0.09 % OS respectively. The comparison between fuzzy logic controller and PID controller shows that the fuzzy logic controller gives better performance response with the rise time (Tr), the settling time (Ts), …
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Mixing and Nucleosynthesis in Low- and Intermediate-Mass AGB Stars
… to pressure scale height ratio of 1.5 (with no overshoot), the transport of $\sp $C outward stops (a few) $\cdot$ 10$\sp{-5}$ M$\sb\odot$ below the convective envelope. If a limited amount of convective overshoot is included in these models, dredge up of interior matter will occur when the …
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Modeling and Control of Dual-Motored Tail-Sitting Flying Wing Using a Fuzzy Logic Pid Controller
… for increased response time and reduced overshoot. Reducing overshoot is of particular interest in this case as, on an aircraft such as this, it has the potential for entering undesirable and unrecoverable states, especially during its transition. Secondly, a mixing of the two flight …
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Evaluating Future Runoff, Water Stress and Fluvial Flooding in China under Climate Change
… to date have examined such risks under climate overshoot scenarios, despite their increasing plausibility under current emission trajectories. This study presents an integrated assessment of future runoff, water stress and fluvial flooding across China under a range of climate and socioeconomic …
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The Statistical Theory of Stationary Turbulence
… for the continuous wavelet transform; the overshoot of the reconstructed function, at points of discontinuity, is always smaller than the corresponding overshoot for the Fourier transform.
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Effect of Image Sharpening on Radiographic Image Quality
… assessed for image quality. “Uberschwinger” or overshoot artifact was also assessed. Each image was sharpened and then highly sharpened. Images were compared using Friedman's two-way nonparametric ANOVA. Image quality with regards to noise and resolution were significantly affected by image …
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Development of a control system for gas concentration and temperature in an animal preference chamber
… and 51.9±12.8 min, respectively. The setpoint overshoot of the new 600W heating system was 1.5±0.4°C and 0.9±0.1°C for 1°C and 3°C, respectively. This overshoot was greater than for the original 200W heating system, which showed a 0.4±0.1°C overshoot for the +1°C step response and a negligibly …
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Three essays in sustainable operations management with implications for the triple bottom line
We are in a state of overshoot; the human population today consumes natural resources at a rate that exceeds what the planet can sustainably provide in the long term (Meadows et al., 2004). Two key causes of this overshoot are the overconsumption of natural resources, and the reluctance or …
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Computation of Reynolds stresses in axisymmetric vortices and jets using a second order closure model
… be relatively weak within the core region. The overshoot of the circulation is found to be 5% of the circulation at infinity over a wide range of Reynolds numbers. The effects of Reynolds number on the decay of the vortices are computed and discussed. Some of the quantities, such as mean flow …
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An Extended Potential Field Controller for use on Aerial Robots
… results show that the ePFC reduces the overshoot of the robot's location in response to a step input by 19% and the settling time by nearly 17% when compared to a traditional PFC. The proposed controller is implemented on an experimental platform, the ARDrone 2.0, and the obtained …
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Theoretical Studies of High Field, High Energy Transport in Gallium-Arsenide, Silicon and Heterostructures
… quantization, real space transfer, and velocity overshoot, which was recently termed ballistic transport.
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Constraining fundamental physics from cosmology
… rule out the inflationary paradigm. The overshoot problem is the need to make the initial kinetic energy of the inflaton small enough to ensure slow-roll. I investigate claims that brane inflation solves the overshoot problem through microphysical restrictions on the phase space of …
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Prosthesis Design and Object Recognition Based Grasping of a 3D Printed Anthropomorphic Artificial Hand
… feedback, however, the digits displayed massive overshoot in trajectory. An open-loop control method is developed to smoothen artificial hand digit trajectory while reducing trajectory overshoot and transient vibrations. By using this method, the prosthesis digit trajectory is tested against the …
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The internal performance of iterative feedback tuning
… the closed loop performance. These are such as overshoot in the response for setpoint tracking and that for output disturbance rejection. On the other hand the advantage of pole shifting is that for a one degree of freedom control structure all the characteristic equations of the loop transfer …
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A compact model for silicon controlled rectifiers in low voltage CMOS processes
… as quasi-static I-V curves and transient voltage overshoot, are discussed. These aspects include conductivity modulation of the well resistances in the SCR, impact ionization at the N-well/P-well junction, and the influence of electric fields in the well region on carrier diffusion between the …
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