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 76 for “"settling-time"”.
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Settling-Time Improvements in Positioning Machines Subject to Nonlinear Friction Using Adaptive Impulse Control
… single parameter methods suffer from sub-optimal settling times and poor parameter convergence. To improve performance while maintaining the capacity for ultimate precision, a new control method referred to as Adaptive Impulse Control (AIC) has been developed. To better fit the nonlinear …
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A design for an RGB LED driver with independent PWM control and fast settling time
… The application circuit demonstrates current settling times between 7[mu]s and 30[mu]s at a switching frequency of 290kHz. Current settling is improved at higher switching frequencies, with settling times approaching a 2[mu]s to 4[mu]s range at 1MHz switching.
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Performance limits of linear variable reluctance motors in controlled linear motion applications
… positioning performance, as measured by settling time, has been demonstrated in the context of manufacturing automation applications such as circuit board assembly and other product-transfer operations. The control objective is to move a single mass in a single axis from a starting …
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Feedback Control of Ionic Polymer Actuators
… of ionic polymer actuators is that their settling time to a unit step voltage is on the order of 5-20 seconds in a cantilever configuration. The slow time constant of an ionic polymer limits the actuation bandwidth. The characteristics of ionic polymer actuators, low force and large …
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Time optimal control for asymptotic tracking of linear systems with input saturation
… We have explored the problem of asymptotic time optimal tracking for a class of linear system with actuator nonlinearities. A formula on the optimal settling time is given and the corresponding composite nonlinear feedback control law can serve as a control law to approximate the optimal …
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AC motor speed performance improvement using fuzzy logic control
… induction motor because it can reduce 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 …
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Assessment of moving-mass actuators for hypersonic vehicles with deployable decelerators
… PD control is presented which reduces the 2% settling time from 9 seconds to 5 seconds and removes all oscillations. An optimal control formulation is then solved, to minimize time, which reduces the settling time from 5 seconds to 0.6 seconds. The optimal control solutions move the mass …
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A Comparison of PID and Sliding Mode Controllers When Applied to the Orbit Raising of a Satellite Using Solar Sail Propulsion
… compares to a PID controller with respect to settling time and state response error over a range of maximum reaction wheel torque values. The actuator saturation and actuator energy are then compared for two different sliding mode controllers and a PID controller. It was found that the sliding …
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Modelling, design, and control of a spherical rolling robot
… parameters impacting system performance in sometimes non-intuitive ways. This thesis explores the effect of different design parameters such as sphere mass and center of mass location on the performance of a spherical rolling robot. A kinematic and dynamic model of the system was created, along …
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An Extended Potential Field Controller for use on Aerial Robots
… 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 results show that the drone is able to track both static and dynamic targets, …
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Green approach to treat institutional wastewater by using cassava peels starch (CPS) as coagulant aid
… mechanism to achieve optimum pH, dosage, and settling time, to premeditated institutional wastewater removal efficiency (%) of COD, TSS & Turbidity. Institutional wastewater physicochemical characteristics were analyzed by pH, temperature, turbidity, COD, TSS, BOD, Characteristics of CPS were …
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Hybrid fuzzy-proportionl integral derivative controller (F-PID-C) for control of speed brushless direct current motor (BLDCM)
… and error and performance parameters are rise time, settling time and overshoot. The findings show that the trapezoidal membership function give good results of short rise time, fast settling time and minimum overshoot compared to others for speed control of the BLDC motor.
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Harvesting of microalgae botryococcus sp. Through phycoremediation of bathroom greywater
… of three factors, i.e. coagulant dosage, settling time and pH on the harvesting efficiency. Lastly, the biomass recovery was conducted via optical density to calculate the biomass recovery for M. oleifera and S. potatorum. The optimal conditions obtained from the compromise of one …
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Hybrid fuzzy- proportionl integral derivative controller (F-PID-C) for control of speed brushless direct curren motor (BLDCM)
… and error and performance parameters are rise time, settling time and overshoot. The findings show that the trapezoidal membership function give good results of short rise time, fast settling time and minimum overshoot compared to others for speed control of the BLDC motor.
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Position Control Comparison of Equilibrated and Mass Counterweight Systems
… to the mass counterweight in measures of settling time and peak overshoot.
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Coagulation and flocculation process using cassava peel starch modified with lemongrass extract for pollutants removal in raw water
… water. The effects of pH, coagulant dosage and settling time on coagulation and flocculation performance of the coagulants were also determined. The coagulation and flocculation mechanisms were examined through floc characterization and electrokinetic analyses. Characterization study of …
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Magnetic seeding aggregation to enhance the removal efficiency of TiO2 nanoparticles from water
… with very high coagulant dosage and prolonged settling time. Clearly, conventional treatment will prove to be costly and impractical to treat TiO_2 in water. This research presents a method of using cationic surfactant-modified magnetite nanoparticles to enhance removal efficiency of TiO_2 …
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Bacterial coagulation by a chlorinated solvent
… species were observed. 2. Increased length of settling time increased the percent removal of pure cultures. 3. The solvent coagulation process worked best at a pH very near the pH produced by the bacteria during growth. 4. There was no advantage in changing from room temperature. S. proper …
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Design of a stabilization method for cable suspended camera systems
… In simulation, the controller reduced the settling time by four orders of magnitude, but was ultimately deemed infeasible to implement.
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A low power digitizer for precision carrier band measurements
… and ways to reduce it are discussed. First, the settling time of the circuit is explored by analyzing the design of the transmission gates used to implement the switched capacitor integrators in the [Sigma][Delta]. Next, the effects of op amp transistor mismatch is considered via simulations …
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