scholarly journals A Taboo Search Optimization of the Control Law of Nonlinear Systems with Bounded Uncertainties

2016 ◽  
Vol 11 (2) ◽  
pp. 224 ◽  
Author(s):  
Amira Gharbi ◽  
Mohamed Benrejeb ◽  
Pierre Borne
Keyword(s):  
Control Law ◽  
Comparison System ◽  
Taboo Search ◽  
Search Optimization ◽  
Aggregation Techniques ◽  
Final Error ◽  
The One ◽  
Bounded Perturbations ◽  
Bounded Uncertainties ◽  
Vector Norms

The aim of this paper is to propose a method to determine among the eligible controls of a nonlinear system, with bounded perturbations, the one which minimizes the final error. The approach is based on the implementation of aggregation techniques using vector norms in order to determine a comparison system used to calculate an attractor in view of its minimization by implementation of metaheuristics.

Optimal Design of Spatial Grid Structure Using Group Search Optimization

2011 ◽  
Vol 243-249 ◽  
pp. 6044-6048 ◽  
Author(s):  
Bing Yuan ◽  
Feng Ming Ren ◽  
Gen Quan Zhong ◽  
Jing Zhou
Keyword(s):  
Optimization Design ◽  
Element Model ◽  
Optimization Methods ◽  
Grid Structure ◽  
Optimization Analysis ◽  
Search Optimization ◽  
Spatial Grid ◽  
The One ◽  
Group Search ◽  
Design Proposal

An economic and safety design proposal of the spatial grid structure is very difficult to find according to traditional design method.The group search optimization and its improved algorithm are applied in optimization design of a spatial grid structure in this paper. In this paper the finite element model of the spatial grid structure is firstly built through the platform of ANSYS. Then based on the parameterized programme language ADPL of ANSYS ,the group search optimization (GSO) and the quick group search optimization(QGSO ) are compiled ,the optimization analysis of the spatial grid structure are carried out. Finally, the optimization results and the optimization one from ANSYS are compared. It show that the optimization methods hereinbefore are feasible and the design proposals of them are better than the one of ANSYS.

Robust Control of Generalized Dynamic Systems Without the Matching Conditions

1991 ◽  
Vol 113 (4) ◽  
pp. 582-589 ◽  
Author(s):  
Zhihua Qu ◽  
John Dorsey
Keyword(s):  
Robust Control ◽  
Dynamic Systems ◽  
Control Law ◽  
General Control ◽  
Matching Conditions ◽  
Uncertain Dynamic Systems ◽  
Special Cases ◽  
The Stability ◽  
Bounded Uncertainties

A general control law and a set of conditions are proposed to guarantee the stability of dynamic systems with bounded uncertainties. The results do not require the matching conditions on the uncertainties and subsume several existing results as special cases. Moreover, it is shown that there is at least one class of uncertain dynamic systems which can always be stabilized under the proposed control law no matter what the size and the structure of the input-unrelated uncertainties.

scholarly journals Simple Algebraic Criteria for Asymptotic Stability of a Class of TS Fuzzy Time-Delay Switched Systems

2018 ◽  
Vol 2018 ◽  
pp. 1-13
Author(s):  
Nawel Aoun ◽  
Marwen Kermani ◽  
Anis Sakly
Keyword(s):  
Time Delay ◽  
Asymptotic Stability ◽  
Switched Systems ◽  
Type Systems ◽  
State Matrix ◽  
Comparison System ◽  
Switching Strategy ◽  
Fuzzy Models ◽  
Arbitrary Switching ◽  
Vector Norms

This paper investigates the asymptotic stability of a class of TS fuzzy switched systems when an arbitrary switching strategy is adopted. The proposed method, applied to neutral and retarded-type systems, is based on the vector-norms approach. The idea consists in defining a common comparison system to all the fuzzy models. If this comparison system can be described by a state matrix that fulfills the properties of the opposite of an M-matrix, then we can conclude on the asymptotic stability of the initial system via simple algebraic delay-independent conditions.

On Position/Force Control of Robot Interacting With Dynamic Environment in Cartesian Space

1996 ◽  
Vol 118 (1) ◽  
pp. 187-192 ◽  
Author(s):  
Miomir Vukobratovic´ ◽  
Radoslav Stojic´
Keyword(s):  
Dynamic Environment ◽  
Interaction Force ◽  
System Stability ◽  
Control Law ◽  
Unified Approach ◽  
Control Task ◽  
Simultaneous Stabilization ◽  
Cartesian Space ◽  
The One ◽  
Loop Motion

In this paper, the problem of simultaneous stabilization of both the robot motion and interaction force in Cartesian space, based on the unified approach to contact task problem in robotics [1], is considered. This control task is solved under the conditions set on environment dynamics which are less restrictive than those in [1] where some particular environment properties are required to ensure overall system stability. Furthermore, the one-to-one correspondence between closed-loop motion and force dynamic equations is obtained and unique control law ensuring system stability and preset either motion or force transient response is proposed.

scholarly journals Derivation of OCC Modulator for Grid-Tied Single-Stage Buck-Boost Inverter Operating in the Discontinuous Conduction Mode

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3168
Author(s):  
Ben Zhao ◽  
Yigeng Huangfu ◽  
Alexander Abramovitz
Keyword(s):  
High Gain ◽  
Single Stage ◽  
Modulation Scheme ◽  
Control Law ◽  
Switching Loss ◽  
Discontinuous Conduction Mode ◽  
The One ◽  
Grid Level ◽  
Conduction Mode ◽  
Micro Inverter

This paper is concerned with the derivation of a one-cycle controller for driving a single-stage buck-boost DC-AC micro-inverter in grid-tied applications. The topology under study is based on a full-bridge switch arrangement with no unfolder circuit. The proposed micro-inverter attains a high gain by applying a multi-winding tapped inductor and, therefore, can operate at grid-level voltage without using a DC-DC step-up stage. To minimize the switching loss, the proposed inverter is operated in the discontinuous conduction mode. The operation principles of the proposed topology in the discontinuous conduction mode are discussed and analyzed. Based on the analysis, the one-cycle control law and modulator circuitry needed to control the proposed micro-inverter are developed. The feasibility of the proposed modulation scheme is verified by simulation.

A singularly perturbed method for pole assignment control of a flexible manipulator

Robotica ◽  
2002 ◽  
Vol 20 (6) ◽  
pp. 637-651 ◽  
Author(s):  
Atsushi Konno ◽  
Liu Deman ◽  
Masaru Uchiyama
Keyword(s):  
Control Method ◽  
Pole Assignment ◽  
Singularly Perturbed ◽  
Flexible Manipulator ◽  
Control Law ◽  
Composite Control ◽  
Damping Control ◽  
Points Of View ◽  
The One ◽  
Derivatives Of

This paper focuses on using a singularly perturbed approach to derive a vibration damping control law in which a pole assignment feedback method is utilized. The composite control system is characterized by two components which can be computed separately. The one is Cartesian-based PI control which drives the end-effector of a flexible manipulator to track the desired time-based trajectory. The other is pole assignment feedback control which damps out vibrations during and at the end of trajectory tracking. An advantage of this composite control method in real implementation is that it does not require a derivative of the end-effector's position, and the derivatives of signals from the strain gauges. From the characteristics and implementation points of view, it appears to be simple to use. Laboratory experiments were conducted to evaluate the performance of the proposed control method.

scholarly journals Decentralized Finite-TimeH∞Connective Control for a Class of Large-Scale Systems with Different Structural Forms

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Xiaohua Li ◽  
Yang Liu ◽  
Xiaoping Liu
Keyword(s):  
Feedback Control ◽  
Finite Time ◽  
Large Scale ◽  
State Feedback ◽  
Sufficient Conditions ◽  
Original System ◽  
State Feedback Control ◽  
Control Law ◽  
Interconnected System ◽  
The One

Decentralized finite-timeH∞connective control problem for a class of large-scale interconnected systems is studied in this paper. The research aims at two structural forms, namely, the interconnected structure and the one with expanding construction. A new method is proposed to design a decentralized state feedback control law for a large-scale interconnected system so that the closed-loop system is finite-timeH∞connectively bounded. The sufficient conditions for the existence of such a decentralized control law are deduced by using LMI method. Another method is presented for a large-scale interconnected system with expanding construction which can be used without changing the decentralized state feedback control law of the original system to design a controller for the newly added subsystem so that both the new subsystem and the resulting expanded system are finite-timeH∞connectively bounded. The feasibility and effectiveness of the proposed method are verified by some simulation results.

scholarly journals Center-of-Gravity Variation-Driven Spherical UAV System and Its Control Law

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Donghoon Kim ◽  
Sungwook Yang
Keyword(s):  
Tracking Control ◽  
Center Of Gravity ◽  
Path Tracking ◽  
Variation Principle ◽  
Control Law ◽  
Control Torque ◽  
Numerical Studies ◽  
The Moment ◽  
The One ◽  
Control Surfaces

Most of the spherical unmanned aerial vehicles (SUAVs) use control surfaces, which are functions of aileron and an elevator, to generate control torque. The work proposes a new conceptual design of an SUAV system controlled through center-of-gravity (CG) variations with its path-tracking control law designed for the system. Compared to the one using control surfaces, the concept suggested is beneficial in the aspect of the expandability of building lighter and smaller SUAVs, especially. A CG variation principle by actuating a pendulum type of a moving part is considered as a methodology for both translational and rotational motion control of an SUAV. Since variations of the moment-of-inertia (MOI) elements which resulted from the motion of the moving part affect the performance of the suggested method, the variations of MOI analysis are performed for all angular ranges of the moving part. As a result, certain angular ranges for the moving part to prevent the degradation of the path-tracking performance by the effect of the MOI changes are found. By considering the findings, numerical studies are performed for hovering, ascent, descent, and horizontal tracking missions. The applicability of the proposed SUAV system and the corresponding controller to achieve the path-tracking missions is demonstrated through the numerical simulation.

Die Allokation von Rettungsmitteln

2019 ◽  
Author(s):  
Ulrich Spiegel
Keyword(s):  
Integrated Control ◽  
The Other ◽  
Control Law ◽  
Legal Basis ◽  
Function Structure ◽  
First Come First Serve ◽  
The Subject ◽  
The One ◽  
Disaster Control ◽  
First Time

On the one hand, the thesis makes function, structure and legal bases of the integrated control centres responsible for the allocation of rescue vehicles accessible on a legal basis, for the first time using the generalisable example of the Free State of Bavaria. On the other hand, the legal and, not least, constitutional problem of the distribution of rescue vehicles in everyday emergency and scarcity situations outside of disaster control law is discussed. The thesis does pioneering work, since it arranges the basics of the subject that are not easily accessible and deals independently with the problem of prioritisation. The author states – inter alia – that a regulation regarding the allocation of rescue vehicles, which exclusively establish a distribution according to the first come, first serve principle, is unconstitutional. In addition, requirements for a lawful allocation regulation are presented.

Note on Selection of Coordinate Systems for Geodynamics

1975 ◽  
Vol 26 ◽  
pp. 395-407
Author(s):  
S. Henriksen
Keyword(s):  
Sea Level ◽  
The Other ◽  
Coordinate Systems ◽  
Mean Sea Level ◽  
The Earth ◽  
The One ◽  
Static Systems ◽  
Selection Of

The first question to be answered, in seeking coordinate systems for geodynamics, is: what is geodynamics? The answer is, of course, that geodynamics is that part of geophysics which is concerned with movements of the Earth, as opposed to geostatics which is the physics of the stationary Earth. But as far as we know, there is no stationary Earth – epur sic monere. So geodynamics is actually coextensive with geophysics, and coordinate systems suitable for the one should be suitable for the other. At the present time, there are not many coordinate systems, if any, that can be identified with a static Earth. Certainly the only coordinate of aeronomic (atmospheric) interest is the height, and this is usually either as geodynamic height or as pressure. In oceanology, the most important coordinate is depth, and this, like heights in the atmosphere, is expressed as metric depth from mean sea level, as geodynamic depth, or as pressure. Only for the earth do we find “static” systems in use, ana even here there is real question as to whether the systems are dynamic or static. So it would seem that our answer to the question, of what kind, of coordinate systems are we seeking, must be that we are looking for the same systems as are used in geophysics, and these systems are dynamic in nature already – that is, their definition involvestime.

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