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  • damage  (3)
  • optimal control  (3)
  • Springer  (6)
  • American Society of Hematology
  • Blackwell Publishing Ltd
  • Oxford University Press
  • 2000-2004  (6)
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Verlag/Herausgeber
  • Springer  (6)
  • American Society of Hematology
  • Blackwell Publishing Ltd
  • Oxford University Press
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  • 1
    Digitale Medien
    Digitale Medien
    An All-Aspect Near-Optimal Guidance Law (2000)
    Springer
    Dynamics and control 10 (2000), S. 165-177 
    Details
    ISSN: 1573-8450
    Schlagwort(e): missile guidance ; optimal control
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract In this paper, a new guidancelaw known as the all-aspect proportional navigation (AAPN) guidancelaw is formulated. AAPN is a modification of traditional proportionalnavigation, with an additional term added to improve performanceat large heading error angles. The missile guidance problem isfirst formulated as an optimal control problem and solved usinga combined genetic algorithm-shooting method. The problem isrepeatedly solved at various heading error angles. By employingChebychev polynomial fitting, we can then determine the parametersof the AAPN. Subsequently, AAPN is compared against the proportionalnavigation guidance law as well as the optimal solution. Theresults clearly show that AAPN outperforms PN at large headingerror angles. Also, its performance is only slightly inferiorto the optimal solution.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008395924656
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Some Optimal Control Problems Governed by Elliptic Variational Inequalities with Control and State Constraint on the Boundary (2000)
    Springer
    Journal of optimization theory and applications 106 (2000), S. 627-655 
    Details
    ISSN: 1573-2878
    Schlagwort(e): variational inequalities ; optimal control ; state constraint ; maximum principle
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract This work deals with the necessary conditions of optimality for some optimal control problems governed by elliptic variational inequalities. Boundary control and state constrained problems are considered. The techniques used are based on those in Ref. 1 and a new penalty functional is defined in this paper.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1004613630675
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Dynamic compression-shear response of brittle materials with specimen recovery (2000)
    Springer
    Experimental mechanics 40 (2000), S. 321-330 
    Details
    ISSN: 1741-2765
    Schlagwort(e): Fragmentation ; damage ; ceramics ; impact ; wave propagation ; nanocomposites
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A new configuration for compression-shear soft-recovery experiments is presented. This technique is used to investigate various failure mechanisms during dynamic multiaxial loading of an Al2O3/SiC nanocomposite and TiB2. Velocity profiles of the target surface are measured with a variable sensitivity displacement interferometer, yielding normal and transverse velocity-time histories. A dynamic shear stress of approximately 280 MPa is obtained, in the Al2O3/SiC nanocomposite, for an imposed axial stress of about 3.45 GPa on a 540 μm thick sample. This dynamic shear stress is well below the value predicted by elastic wave propagation theory. This could be the result of stress-induced damage and inelasticity in the bulk of the sample or inelasticity on the sample surface due to frictional sliding. To gain further insight into the possible failure mechanisms, an investigation of compression-shear recovery techniques, with simultaneous trapping of longitudinal and lateral release waves, is conducted.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02327506
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Bilinear Control and Application to Flexible a.c. Transmission Systems (2000)
    Springer
    Journal of optimization theory and applications 105 (2000), S. 621-637 
    Details
    ISSN: 1573-2878
    Schlagwort(e): bilinear systems ; optimal control ; controllability ; stabilization ; electric power
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract The purpose of this paper is an integrated overview of bilinear systems (BLS) research which has evolved over the past few decades, and a new result on control of flexible a.c. transmission systems (FACTS) is presented. BLS may be derived in many cases from principles of physics, chemistry, biology, socioeconomics, and engineering. In other cases, BLS are more accurate approximations to nonlinear systems than are traditional linear systems, as shown for example by the added bilinear terms (in state and control) for the Taylor series. While an appropriately designed linear control system may be optimum relative to some quadratic performance index without added constraints, bilinear or parametric control can be designed to improve more global performance and indeed to increase the region of attainable states. Such controllability and stabilization of BLS and of a series line-capacitor controlled FACTS is presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1004645224313
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Creep Failure Analysis of Bars Sustaining Constant Tensile Loads (2000)
    Springer
    Mechanics of time-dependent materials 4 (2000), S. 57-79 
    Details
    ISSN: 1573-2738
    Schlagwort(e): creep ; damage ; fracture ; life time ; viscoplasticity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Life time and failure modes are predicted for metallic barssustaining tensile creep. Experimental results show that a ductile or a`brittle' mode of fracture occurs depending respectively on whether thenominal applied stress is large or small. The analysis is based on amodeling of void nucleation and growth in which damage evolution iscontrolled by two mechanisms of plastic flow in the matrix material.Fracture is supposed to occur when the porosity attains a critical valuewhich depends on the mode of fracture considered. Experimental resultsare explained and described in terms of the proposed model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009875505588
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Prediction of the Residual Structural Integrity of a Polymer Matrix Composite Construction Element (2000)
    Springer
    Mechanics of time-dependent materials 4 (2000), S. 155-167 
    Details
    ISSN: 1573-2738
    Schlagwort(e): damage ; durability ; influence of environmental conditions ; laminates ; reliability ; unidirectional lamina ; viscoelasticity ; viscoplasticity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Polymers are time-dependent materials. Polymer matrix compositesbehave as viscoelastic-viscoplastic anisotropic continua. Theirthermomechanical characteristics are not only time-dependent, but arestrongly influenced by the variations of the environmental conditions(temperature, moisture diffusion, radiation, etc.). This concerns notonly the stiffness but also the strength characteristics, related to thedamage development. Due to the composite nature, the number of potentialdamage sources is high and the damage development has to take intoaccount all the interactions between simple mechanical loading modes,with or without, changing environmental conditions. Following anon-linear viscoelastic-viscoplastic analysis, based on the Schaperyequations and a Zapas–Crissman functional, the stiffness degradation isobtained based on short-term creep and creep-recovery measurements atdifferent stress levels and different temperatures. A damagecomponent is added to the viscoelastic-viscoplastic model in order toaccount for damage development and associated strength degradation.Results obtained in the transverse direction of an unidirectionalgraphite-epoxy composite are presented. The extension to completelaminates with different stacking sequences is discussed. An assumptionon the interlaminar behaviour must be introduced in order to take intoaccount the important damage source not considered in classical laminatetheories.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009829926708
    Standort Signatur Erwartet Verfügbarkeit
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