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IEEE 1991 International Conference on Systems Engineering

1-3 Aug. 1991

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Displaying Results 1 - 25 of 110
  • IEEE International Conference on Systems Engineering (Cat. No.91CH3051-0)

    Publication Year: 1991
    Request permission for commercial reuse | PDF file iconPDF (106 KB)
    Freely Available from IEEE
  • Modeling of linear isentropic flow systems

    Publication Year: 1991, Page(s):422 - 425
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (266 KB)

    A modeling approach for linear isentropic flow systems based on the quasi-one-dimensional Euler equations of nonviscous, compressible flow is presented. Such systems are representative of certain high-speed propulsion systems. Accurate models useful in control system studies are developed. A supersonic inlet is considered, and the resulting set of partial differential equations with boundary condi... View full abstract»

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  • Focusing of synthetic aperture ultra wideband data

    Publication Year: 1991, Page(s):1 - 5
    Cited by:  Papers (19)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (553 KB)

    The synthetic aperture radar (SAR) focusing problem is considered, with special attention given to focusing an area in the near-field of the synthetic aperture over a decade or more of bandwidth in a manner that preserves target resonance characteristics. An approximation that reduces the computational load is shown. An error analysis of the approximation shows quantitatively what conditions are r... View full abstract»

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  • A comparison of 1D and 2D algorithms for radar target classification

    Publication Year: 1991, Page(s):6 - 12
    Cited by:  Papers (18)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1242 KB)

    The use of high-resolution radar measurement data (35 GHz) from four ground vehicles (bulldozer, Dodge Power Wagon, Dodge Van, and Camaro) to evaluate the performance of several 1D and 2D classifiers is discussed. The 1D classifiers use high-resolution range profiles to classify targets; the 2D classifier uses high-resolution inverse synthetic aperture radar (ISAR) images to classify targets. Clas... View full abstract»

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  • High-resolution parametric modeling of canonical radar scatterers with application to radar target identification

    Publication Year: 1991, Page(s):13 - 16
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (310 KB)

    An approach to scattering center extraction based on a model derived from the geometric theory of diffraction is developed. This model is better matched to the physical scattering process than competing methods. In addition, the model extracts more information about the scattering centers. An estimation algorithm for the model is developed and shown to have superior performance to the Prony algori... View full abstract»

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  • Adaptive multiband polarization processing for surveillance radar

    Publication Year: 1991, Page(s):17 - 20
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (371 KB)

    It is shown that frequency diversity improves detection performance of adaptive radar processing in the polarization domain. Multiband processing increases the quantity of data available for covariance estimation of clutter which is often inhomogeneous in range. The diversity improvement under an equal transmit energy constraint is greater for adaptive processors than that obtained in optimal proc... View full abstract»

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  • Synthetic aperture radar segmentation using wavelets and fractals

    Publication Year: 1991, Page(s):21 - 24
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    It is shown that fractal dimension estimates and Gabor wavelet coefficients are valid features of segmenting high-resolution polarimetric synthetic aperture radar imagery. Results of training a radial basis function neural network using fractal dimension features, Gabor wavelet coefficients, and a combination of both fractal and Gabor wavelet features are presented. Current research into combining... View full abstract»

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  • Detection and classification of acoustic signals from fixed-wing aircraft

    Publication Year: 1991, Page(s):25 - 28
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (278 KB)

    The acoustic emission from a twin propeller aircraft is analyzed in the frequency domain. The time-varying power spectrum estimate of the signal is generated. The approach is to generate frequency spectra for fixed time segments of the signal using the Welch method. A confidence interval is calculated, and if the confidence interval is too wide, the power spectrum estimate is not incorporated into... View full abstract»

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  • An overview of radar-based, automatic, noncooperative target recognition techniques

    Publication Year: 1991, Page(s):29 - 34
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    Radar target recognition techniques tend to fall into two principle classes: those that exploit the radar characterization of a platform's physical shape and those that exploit the radar characterization of the dynamic characteristics of the moving parts of the target. The former are based on the platform's (essentially instantaneous) range (time)-amplitude radar signature and are exploited throug... View full abstract»

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  • The Rapid Design System: memory-driven feature-based design

    Publication Year: 1991, Page(s):35 - 37
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A CAD system based on feature-based design is discussed. Feature-based design is an attempt to establish a higher level of representation, i.e., primitives (features) which have meaning and are interpretable by both the design system and the designer. A feature can refer to any technical or economic aspect of a product's representation or any attribute of the forming process and/or finished produc... View full abstract»

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  • Positioning features within the Rapid Design System

    Publication Year: 1991, Page(s):38 - 41
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (433 KB)

    A method for representing and manipulating information on dimensioning and positioning within a feature-based environment for mechanical parts design is described. In the feature-based design paradigm, designs are constructed using form features which are high-level representations of part geometry, i.e. block, hole, slot, pocket, chamfer, fillet, etc. In the system discussed two modes of position... View full abstract»

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  • Automated inspection planning within the Rapid Design System

    Publication Year: 1991, Page(s):42 - 48
    Cited by:  Papers (3)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (637 KB)

    A methodology for automated inspection planning of machined parts within feature-based CIM in which part geometry and tolerances are represented as features is described. This representation of information as features is extended to inspection process planning where inspection plan fragments are inspection features containing specific information about how toleranced geometry is to be inspected. A... View full abstract»

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  • A computer-based adaptive associative memory in support of design and planning

    Publication Year: 1991, Page(s):49 - 56
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (726 KB)

    Continuing research on the organization and functionalities of a type of computer-implemented associative memory is discussed. The associative memory in question is being created to serve as part of a feature-based design system used primarily in support of the design, fabrication planning, or inspection planning of discrete mechanical machine parts. The development work is consonant with prior re... View full abstract»

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  • Rapid engineering knowledge capture for simultaneous engineering automation

    Publication Year: 1991, Page(s):57 - 60
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (269 KB)

    Simultaneous engineering automation (SEA) and techniques for rapidly capturing engineering knowledge for SEA are discussed. The types of engineering knowledge that must be captured for SEA are described, and an approach for mapping between the engineer and these types of knowledge is presented. This approach anticipates the types of information that the engineer will want to input, and presents th... View full abstract»

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  • Load control system design

    Publication Year: 1991, Page(s):61 - 64
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (370 KB)

    The analysis, design, and simulation of a load control system for an industrial tie tester are discussed. A nonlinear state-space-like representation of the system is developed for system evaluation and design. It is shown that a linearizing feedback control law may be obtained using linear system theory. Simulation results are included to demonstrate the tractability of the control system design ... View full abstract»

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  • Dual control of linear stochastic systems with unknown parameters

    Publication Year: 1991, Page(s):65 - 68
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (386 KB)

    Closed-loop control of linear stochastic control systems with unknown parameters is studied using a dual-control approach. At each state, the cost functional associated with the system objective is decomposed into a certainty equivalence cost and a dual cost. The dual cost is appropriately expressed in terms of filter variables in algebraic form, and it appears to be a sum of dual costs of each fu... View full abstract»

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  • Design of exact model matching control systems for a plant with measurement noise and its application to MRACS

    Publication Year: 1991, Page(s):69 - 72
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (285 KB)

    A design method for an exact model matching control (EMMC) system which reduces the effect of measurement noise on the plant output is presented. This method uses the freedom of controller parameters achieved by increasing the degree of the observer polynomial. For some fixed degree of the observer polynomial, the controller for this EMMC is obtained as a solution of a simple optimization problem.... View full abstract»

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  • Nonlinear and adaptive control of a shunt DC motor

    Publication Year: 1991, Page(s):73 - 76
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (258 KB)

    Three approaches for nonlinear control are compared; feedback linearization, generalized controller canonical forms, and input/output linearization. To establish a framework for comparison, the example of a shunt DC motor is studied. It was found that the conditions for applying the method of feedback linearization were not satisfied; the full 3D state-space system could not be linearized by state... View full abstract»

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  • Robust controller design for lightly damped systems with feedback delay

    Publication Year: 1991, Page(s):77 - 80
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (342 KB)

    A controller design method based on convex programming is used for lightly damped systems with feedback delay. The designed controllers are robust with respect to time delays in the feedback action, which is often crucial to the stability of lightly damped systems. Exogenous disturbances and unmodeled dynamics are taken into account. Since the convex program is a global optimal technique, once a c... View full abstract»

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  • Model reference control of a linear plant with feedthrough element

    Publication Year: 1991, Page(s):81 - 84
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (278 KB)

    A simple control law that guarantees that the outputs of a linear time invariant plant with feedthrough element will converge asymptotically to be prespecified set of desired trajectories is developed. This control law is illustrated on a gas turbine engine to demonstrate its applicability to higher dimension problems and the fast asymptotic convergence to the desired trajectories. With this metho... View full abstract»

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  • A method for self-tuning a PID controller for control of small to medium sized diesel engines

    Publication Year: 1991, Page(s):85 - 88
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (266 KB)

    A self-tuning PID controller designed to control a small to medium-sized diesel engine model is discussed. This controller resembles a parameter adaptive controller while it is in the tuning phase. When it is not tuning it functions like a closed-loop PID controller. The model used to represent the diesel engine contains nonlinearities and widely ranging parameters. Computer simulations were used ... View full abstract»

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  • Instabilities in the feedback linearization of a double inverted pendulum

    Publication Year: 1991, Page(s):89 - 92
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    Numerical results in the feedback linearization of a double pendulum system are presented. Singularities in the vector field of the closed-loop system manifest themselves as numerical instabilities when the denominator of the linearizing control input is sufficiently small. In a practical example, such as balancing a two-link manipulator along an equilibrium manifold, a method to steer the system ... View full abstract»

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  • A reduced-order adaptive control scheme for plants with inaccessible states

    Publication Year: 1991, Page(s):93 - 99
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (510 KB)

    A simplified solution to the problem of adaptive pole assignment is presented, and the consequent reduction of the orders of the state variable filters which constitute the controller is outlined. It can be shown that the approach described can be used to deal with plants with unmodeled dynamics, but, contrary to most previous results, it does not require a perfect separation between fast and slow... View full abstract»

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  • Dynamic coupling effects in modeling and control of hard contact motion of a manipulator

    Publication Year: 1991, Page(s):100 - 104
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (425 KB)

    The dynamic coupling effects in the modeling and control of a multiple-joint serial-link manipulator turning a crank mechanism are considered. By dynamically distributing the load, i.e., the crank, the generalized contact forces are decomposed into internal stress and motion components. A rigid body model for the entire closed-chain system is developed. It is shown that a subset of the internal st... View full abstract»

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  • On the hard contact adaptive force control of a manipulator

    Publication Year: 1991, Page(s):105 - 108
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A formulation of the force acting at the center-point of the end-effector of a manipulator based on a free-body diagram is described. With this formulation, the information about uncertainties at the contact point can be obtained by the force sensor. Therefore, the hard contact adaptive force control is formulated and solved by modifying the end-effector's trajectory and the acting proper force/to... View full abstract»

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