7,151 research outputs found
AER-based robotic closed-loop control system
Address-Event-Representation (AER) is an
asynchronous protocol for transferring the information of
spiking neuro-inspired systems. Actually AER systems are able
to see, to ear, to process information, and to learn. Regarding to
the actuation step, the AER has been used for implementing
Central Pattern Generator algorithms, but not for controlling
the actuators in a closed-loop spike-based way. In this paper we
analyze an AER based model for a real-time neuro-inspired
closed-loop control system. We demonstrate it into a differential
control system for a two-wheel vehicle using feedback AER
information. PFM modulation has been used to power the DC
motors of the vehicle and translation into AER of encoder
information is also presented for the close-loop. A codesign
platform (called AER-Robot), based into a Xilinx Spartan 3
FPGA and an 8051 USB microcontroller, with power stages for
four DC motors has been used for the demonstrator.Junta de Andalucía P06-TIC-01417Ministerio de Educación y Ciencia TEC2006-11730-C03-0
A closed loop cryogenic environment pressure regulating system
Nonlinear closed loop control system to regulate the pressure in a cryogenic environment is described. System employs four position contactor with two control bands to react to the signals. Diagrams of element transfer function and required equipment are included
Design of robust current tracking control for active power filters
The paper describes a design methodology for robust current-tracking control of active power filters using quantitative feedback theory (QFT). The design aim is to address system issues of power quality and power factor correction in a double-sided converter (rectifierhverter combination) subject to parametric uncertainty, non-linear dynamic behavior and exogenous disturbances. The paper includes simulation results to demonstrate the dynamic performance attributes afforded to the resulting closed-loop control system, and to verify the design procedure
Closed-loop control system using unscented optimization
PatentThe disclosure provides a closed-loop controller for a controlled system comprising a comparison element generating an error e, a compensator generating a control uɴ value based on the error e, and a control allocator determining a manipulated parameter uᴍ value based on the control uɴ. The control allocator typically utilizes a control effectiveness function and determines uᴍ value by selecting one or more specific system xₒ signals from the system state xᵢ or system input yⱼ values or system parameters values Pk reported, defining a plurality of distributed XD around each specific system xₒ signal, and minimizing an error function E(zᵢ), where the error function E(zᵢ) is based on errors which arise from use of the plurality of distributed XD in the control effectiveness function rather than one or more specific system xₒ signals
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Control Methods for the Electron Beam Free Form Fabrication Process
Engineering a closed-loop control system for an electron beam welder for additive
manufacturing is challenging. For earth and space based applications, components must work in
a vacuum and optical components must be protected from becoming occluded with metal vapor.
For extraterrestrial applications added components increase launch weight and increase
complexity. Here we present three different control methods for electron beam free form
fabrication. A relatively simple coarse feedback control method is introduced that couples path
planning and electron beam parameter controls into the build process to increase flexibility and
improve build quality. The different approaches may be applied separately or together to provide
enhanced EBF3 system performance.Mechanical Engineerin
KNOWLEDGE REPRESENTATION APPROACH TO CLOSED LOOP CONTROL SYSTEM - A TANK SYSTEM CASE-STUDY
Control engineering problems are dealt within a plethora of methods and approaches depending on the a priori
knowledge, the description of the process to control, and the main control goal. Classical control theory is
mainly based on properties of numerical models. This paper presents an approach that applies to a class of
processes described by numerical and logical relations using inference and a knowledge base system. To attain
this goal an ontology for control systems is constructed. The work presented in this paper is based in a three
tank system benchmark
Control of a lane-drop bottleneck through variable speed limits
In this study, we formulate the VSL control problem for the traffic system in
a zone upstream to a lane-drop bottleneck based on two traffic flow models: the
Lighthill-Whitham-Richards (LWR) model, which is an infinite-dimensional
partial differential equation, and the link queue model, which is a
finite-dimensional ordinary differential equation. In both models, the
discharging flow-rate is determined by a recently developed model of capacity
drop, and the upstream in-flux is regulated by the speed limit in the VSL zone.
Since the link queue model approximates the LWR model and is much simpler, we
first analyze the control problem and develop effective VSL strategies based on
the former. First for an open-loop control system with a constant speed limit,
we prove that a constant speed limit can introduce an uncongested equilibrium
state, in addition to a congested one with capacity drop, but the congested
equilibrium state is always exponentially stable. Then we apply a feedback
proportional-integral (PI) controller to form a closed-loop control system, in
which the congested equilibrium state and, therefore, capacity drop can be
removed by the I-controller. Both analytical and numerical results show that,
with appropriately chosen controller parameters, the closed-loop control system
is stable, effect, and robust. Finally, we show that the VSL strategies based
on I- and PI-controllers are also stable, effective, and robust for the LWR
model. Since the properties of the control system are transferable between the
two models, we establish a dual approach for studying the control problems of
nonlinear traffic flow systems. We also confirm that the VSL strategy is
effective only if capacity drop occurs. The obtained method and insights can be
useful for future studies on other traffic control methods and implementations
of VSL strategies.Comment: 31 pages, 14 figure
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