Robust and high-performance numerical software for controlsystems analysis and design [such as SLICOT (Subroutine Library In control Theory), which is a Benelux initiative from the Working Group on Software (WGS) in ...
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Robust and high-performance numerical software for controlsystems analysis and design [such as SLICOT (Subroutine Library In control Theory), which is a Benelux initiative from the Working Group on Software (WGS) in cooperation with the Numerical Algorithms Group (NAG), and the RASP control engineering library, which is an initiative from the German Aerospace Research Establishment (DLR)] is an essential ingredient in modern computer-aidedcontrol system design. SLICOT can primarily be viewed as a mathematical library for control-theoretical computations. To avoid duplicating the implementation efforts of good-quality software existing elsewhere, WGS and DLR have agreed to integrate their libraries into a joint standard control library. Making the product freely available will ensure a wider and faster distribution of these computational tools and will make the much needed software more easily accessible to European industry in the short term. Detailed plans have been developed for the instigation of a thematic network on numerics in control, with the intention of extending the scope of cooperation to a European level.
This paper provides an introduction to VHDL and its application to control system problems. Particular emphasis is placed on the use of VHDL-93 and the impact of discrete time and unidirectional flow. By adapting cont...
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This paper provides an introduction to VHDL and its application to control system problems. Particular emphasis is placed on the use of VHDL-93 and the impact of discrete time and unidirectional flow. By adapting controlsystems problems to the discrete time constraints of VHDL, considerable simulation speed advantage is realized over the more complete solution of simultaneous equations possible with VHDL-AMS. The basic structure of VHDL is explored, and several examples are included to illustrate critical points. Finally, the modifications needed to VHDL to accommodate the more general needs of analog electronic and other systems are briefly introduced (VHDL-AMS).
In automotive manufacturing, the use of precise control is increasing to satisfy customers' needs, such as fuel economy and air quality. To provide sufficient utility to customers, engine controlsystems are becom...
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In automotive manufacturing, the use of precise control is increasing to satisfy customers' needs, such as fuel economy and air quality. To provide sufficient utility to customers, engine controlsystems are becoming complicated. We applied two types of real time simulators to the development of an engine control system. One is the engine and vehicle simulator which receives the actuator signals, calculates the engine operating conditions such as the engine output torque, air fuel ratio, engine speed and vehicle behavior, vehicle speed reaction force and outputs sensor signals. The other is the control logic simulator substituting for a part of the engine control logic on CPUs. An application of fuel injection control system was conducted and the simulators have the potential to efficiently improve the development process of engine controlsystems.
One of the computation prerequisites in concurrent engineering is to merge different commercial packages and in-house software into a common framework for computational experimenting. The paper reports on a possible s...
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One of the computation prerequisites in concurrent engineering is to merge different commercial packages and in-house software into a common framework for computational experimenting. The paper reports on a possible solution thereof. In particular, the coupling with file driven software is discussed and a generic interface technique to this kind of software is presented. The control engineering environment software ANDECS serves to outline the way in which tool integration of file driven software is supported by modern CACE systems. However, this interface technique is not bound to the ANDECS system only. Thus it can be directly applied to link software to other modular CACE systems like MATLAB and Xmath.
We give canonical forms for a general singular matrix pencil from which several observer design problems are easily solved. The geometrical basis of these forms is emphasized. Algorithms for the robust computation of ...
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We give canonical forms for a general singular matrix pencil from which several observer design problems are easily solved. The geometrical basis of these forms is emphasized. Algorithms for the robust computation of the needed subspaces are given.
A wide variety of analysis and design problems arising in control communication and information theory, statistics, computational geometry and many other fields can be expressed as semidefinite programming problems (S...
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A wide variety of analysis and design problems arising in control communication and information theory, statistics, computational geometry and many other fields can be expressed as semidefinite programming problems (SDPs) or determinant maximization problems (maxdet-problems). In engineering applications these problems usually have matrix structure, i.e., the optimization variables are matrices. Recent interior-point methods can exploit such structure to gain huge efficiency. In this paper, we describe the design and implementation of a parser/solver for SDPs and maxdet-problems with matrix structure. The parser/solver parses a problem specification close to its natural mathematical description, solves the compiled problem efficiently, and returns the results in a convenient form.
This paper introduces a method for automated generation of control logic. The method helps engineers design software for programmable controllers (PCs) used in plant-controlsystems. In this method, sequential control...
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This paper introduces a method for automated generation of control logic. The method helps engineers design software for programmable controllers (PCs) used in plant-controlsystems. In this method, sequential control logic is generated in the form of a sequential function chart based on functional specifications of the target plant which are represented as keywords. The logic generation process is composed of three steps: converting control specifications into machine states, including initial and final states; searching for a transition path between the initial and final states; and converting state transitions into device operations. The applicability of the proposed method was confirmed through a case study of plant control logic design. Correct control logic was generated for the test cases. The new method needed the input of fewer data than the current design method.
To assist the identification of nonlinear dynamic systems, a set of tools has been developed for the MATLAB(R) environment. The tools include a number of different model structures, highly effective training algorithm...
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To assist the identification of nonlinear dynamic systems, a set of tools has been developed for the MATLAB(R) environment. The tools include a number of different model structures, highly effective training algorithms, functions for validating trained networks, and pruning algorithms for determination of optimal network architectures. The toolbox should be regarded as a nonlinear extension to the system identification toolbox provided by The MathWorks, Inc. This paper gives a brief overview of the entire collection of toolbox functions.
A tool-set for the symbolic derivation of extended Kalman filters and the generation of numerical program code is presented and demonstrated. With regard to CACE (computer-aidedcontrol engineering) standardization, t...
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A tool-set for the symbolic derivation of extended Kalman filters and the generation of numerical program code is presented and demonstrated. With regard to CACE (computer-aidedcontrol engineering) standardization, the tool-set's modularity and data exchange are discussed.
As automated manufacturing systems become more complex, the need for an effective design tool to produce both a high level discrete event control system (DECS) and a low level ladder logic implementation, becomes incr...
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As automated manufacturing systems become more complex, the need for an effective design tool to produce both a high level discrete event control system (DECS) and a low level ladder logic implementation, becomes increasingly more important. Petri nets represent the most effective method for the design of such DECSs. The conversion of such Petri net controllers into ladder logic has been greatly simplified through the advent of the token passing logic methodology. The new technique provides a straightforward but powerful method by which to implement ladder logic code. In this paper the fundamental T-Timed Petri net structures and their associated ladder logic equivalents are described. Finally, the design of a DECS for a manufacturing system is considered. A heuristic Petri net controller is developed for the manufacturing system, and then the methodology is used to derived structured ladder logic code.
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