This paper considers an optimization problem of a 3-dimensional truss whose vibration is controlled in the case of sensor/actuator collocation. The design variables are cross sectional areas of truss members and locat...
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This paper considers an optimization problem of a 3-dimensional truss whose vibration is controlled in the case of sensor/actuator collocation. The design variables are cross sectional areas of truss members and locations of the collocated sensors/actuators. The problem has three objectives, the structural weight, the function that represents the influence of the initial state of the system and the number of sensors/actuators. By minimizing the second objective, we can suppress the vibration to some degree. Moreover, in this paper, we consider the uncertainty of the initial state of the system which is dependent on the initial loading conditions. We treat these three objectives by the weighing method for multiobjective problem. The optimization is carried out by the use of Genetic Algorithm. It is shown through numerical simulation that the improvement of the vibration suppression is accomplished by the small control input for the structure designed by the present formulation.
Repetitive, or multipass, processes are a class of 2D systems of both practical and algorithmic/theoretical interest whose dynamics cannot be analysed or controlled using standard (1D) systems theory. Recently it has ...
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Repetitive, or multipass, processes are a class of 2D systems of both practical and algorithmic/theoretical interest whose dynamics cannot be analysed or controlled using standard (1D) systems theory. Recently it has been shown that the modelling of the boundary conditions, also known as the process initial conditions, is a crucial feature in the analysis and control of these processes. This paper presents some further results on the effects of so-called 'dynamic' process initial conditions on the controllability and stability properties of discrete linear repetitive processes. Previous work has shown that these dynamic process initial conditions alone can destroy the stability properties of these processes. Hence their effects must be 'adequately' accounted for the process modelling stage in order to ensure that subsequent analysis does not lead to incorrect results/conclusions. The main results developed in this paper can be summarised as follows. (i) Computationally efficient stability tests which can, in effect, be applied using standard, or 1D, linear systems tests. (ii) Characterisation of so-called pass controllability in the form of matrix rank based conditions. (iii) Conditions under which the dynamic process initial conditions can be selected to ensure stability and pass controllability.
A fully automatic adjustment system for mass production of the optical head for magnetooptical disk drives is described. The optical head is composed of millimeter scale optical components, such as laser diode, the co...
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A fully automatic adjustment system for mass production of the optical head for magnetooptical disk drives is described. The optical head is composed of millimeter scale optical components, such as laser diode, the collimator lens, the object lens, various prisms and various detectors. A series of algorithms composed of measurement, recognition, calculation of manipulation, execution of manipulation, verification and fixation ensures proper adjustment of the head. The key is to process the measured value, recognize the shape of the beam and the waveform, and determine the manipulation. With this system, the adjustment process is reduced to 6 minutes, as compared to 9 hours it takes an experience worker.
There is currently an enormous interest in the concept of software architecture, largely induced by the concept of architectural patterns first introduced by the architect Christopher Alexander (Alexander, 1979;Alexan...
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A contest on raster to vector conversion was organized at the GREC’97 workshop in Nancy, France. This report describes the methodology used in the contest and presents the results. Various ways of analyzing the perfo...
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This paper presents a benchmark for evaluating the Raster to vector conversion systems. The benchmark is designed for evaluating the performance of graphics recognition systems on images that contain straight lines (s...
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Lee's algorithm (1961) for routing always finds a minimum length path, if one exists. We discuss an enhancement to an earlier maze-routing algorithm to reduce the number of zig-zag line segments in the routing pat...
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Lee's algorithm (1961) for routing always finds a minimum length path, if one exists. We discuss an enhancement to an earlier maze-routing algorithm to reduce the number of zig-zag line segments in the routing path. This method would find a path between two points, if one exists, on a rectangular grid of cells. A line search method using efficient data structures has been applied that would reduce the number of line segments in the path. Blocking cells are introduced as obstacles in finding the path. All line segments are considered as horizontal and vertical only. An implementation of the method and its experimental results are reported.
High Performance Fortran (HPF) is an effective language for implementing regular data parallel applications on distributed memory architectures, but it is not well suited to irregular, block-structured applications su...
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This paper defines a computational protocol for evaluating the performance of raster to vector conversion systems. The graphical entities handled by this protocol are continuous and dashed lines, arcs, and circles, an...
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This paper presents a new fine-grained temporal Petri net model for distributed multimedia synchronization that can handle fuzzy temporal requirements and facilitate to verify the possibility of satisfying QoS require...
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This paper presents a new fine-grained temporal Petri net model for distributed multimedia synchronization that can handle fuzzy temporal requirements and facilitate to verify the possibility of satisfying QoS requirements. We present a procedure for constructing the fine-grained model, starting from a set of relative temporal relations among multimedia objects. And we give an approach to infer unknown durations. Finally, we discuss how to model intra-stream and inter-stream synchronizations so as to guarantee the QoS.
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