37,485 research outputs found
Comparison of different repetitive control architectures: synthesis and comparison. Application to VSI Converters
Repetitive control is one of the most used control approaches to deal with periodic references/disturbances. It owes its properties to the inclusion of an internal model in the controller that corresponds to a periodic signal generator. However, there exist many different ways to include this internal model. This work presents a description of the different schemes by means of which repetitive control can be implemented. A complete analytic analysis and comparison is performed together with controller synthesis guidance. The voltage source inverter controller experimental results are included to illustrative conceptual developmentsPeer ReviewedPostprint (published version
FVF-Based Low-Dropout Voltage Regulator with Fast Charging/Discharging Paths for Fast Line and Load Regulation
A new internally compensated low drop-out voltage
regulator based on the cascoded flipped voltage follower is
presented in this paper. Adaptive biasing current and fast
charging/discharging paths have been added to rapidly
charge and discharge the parasitic capacitance of the pass
transistor gate, thus improving the transient response. The
proposed regulator was designed with standard 65-nm
CMOS technology. Measurements show load and line
regulations of 433.80 μV/mA and 5.61 mV/V, respectively.
Furthermore, the output voltage spikes are kept under
76 mV for 0.1 mA to 100 mA load variations and 0.9 V to
1.2 V line variations with rise and fall times of 1 μs. The
total current consumption is 17.88 μA (for a 0.9 V supply
voltage).Ministerio de EconomÃa y Competitividad TEC2015-71072-C3-3-RConsejerÃa de EconomÃa, Innovación y Ciencia. Junta de AndalucÃa P12-TIC-186
Experimental comparison of parameter estimation methods in adaptive robot control
In the literature on adaptive robot control a large variety of parameter estimation methods have been proposed, ranging from tracking-error-driven gradient methods to combined tracking- and prediction-error-driven least-squares type adaptation methods. This paper presents experimental data from a comparative study between these adaptation methods, performed on a two-degrees-of-freedom robot manipulator. Our results show that the prediction error concept is sensitive to unavoidable model uncertainties. We also demonstrate empirically the fast convergence properties of least-squares adaptation relative to gradient approaches. However, in view of the noise sensitivity of the least-squares method, the marginal performance benefits, and the computational burden, we (cautiously) conclude that the tracking-error driven gradient method is preferred for parameter adaptation in robotic applications
Neural Networks for Modeling and Control of Particle Accelerators
We describe some of the challenges of particle accelerator control, highlight
recent advances in neural network techniques, discuss some promising avenues
for incorporating neural networks into particle accelerator control systems,
and describe a neural network-based control system that is being developed for
resonance control of an RF electron gun at the Fermilab Accelerator Science and
Technology (FAST) facility, including initial experimental results from a
benchmark controller.Comment: 21 p
The Robo-AO-2 facility for rapid visible/near-infrared AO imaging and the demonstration of hybrid techniques
We are building a next-generation laser adaptive optics system, Robo-AO-2,
for the UH 2.2-m telescope that will deliver robotic, diffraction-limited
observations at visible and near-infrared wavelengths in unprecedented numbers.
The superior Maunakea observing site, expanded spectral range and rapid
response to high-priority events represent a significant advance over the
prototype. Robo-AO-2 will include a new reconfigurable natural guide star
sensor for exquisite wavefront correction on bright targets and the
demonstration of potentially transformative hybrid AO techniques that promise
to extend the faintness limit on current and future exoplanet adaptive optics
systems.Comment: 15 page
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