GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    A simple local error estimator and an adaptive time-stepping procedure for direct integration method in dynamic analysis (1993)
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 9 (1993), S. 273-292 
    Details
    ISSN: 1069-8299
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A simple a posteriori local error estimator for time discretization in structural dynamic analysis is presented. It is derived from the difference of the solutions between an ordinary integration method (the Newmark scheme) and another higher-order one which assumes that the derivatives of accelerations vary linearly within each time step. It may be obtained directly without resolving new equations, so the additional computational cost is small and the implementation is convenient. Furthermore, it is shown that this error estimator may also be obtained by Taylor expansion or by a post-processing technique. Accordingly, an adaptive time-stepping procedure, which automatically adjusts the time-step size so that the local error at each time step is within a prescribed accuracy, is described. Numerical examples, including two single-DOF problems, a two-DOF problem and a multi-DOF model, are presented. The results show that the presented local error estimator is simple, reliable and accurate.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cnm.1640090402
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Superconvergent patch recovery of finite-element solution and a posteriori L2 norm error estimate (1994)
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 10 (1994), S. 313-320 
    Details
    ISSN: 1069-8299
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In the paper we present a superconvergent patch recovery technique for obtaining higher-order-accurate finite-element solutions and thus a postprocessed type of L2 norm error estimate. Two modifications make our procedure different from the one proposed by Zienkiewicz and Zhu (1992), in which higher-order-accurate derivatives of the finite-element solution at nodes are determined. Firstly, the recovery process is made for element, not for nodes. An ‘element patch’, which represents the union of an element under consideration and the surrounding elements, is introduced. Secondly, the local error estimate is calculated directly from the improved solution for this element. Numerical tests on both 1D and 2D model problems show that this method can provide an asymptotically exact a posteriori L2 norm error estimate if the used element possesses superconvergent points for the solutions.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cnm.1640100406
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    FINITE ELEMENT METHOD FOR GRADIENT PLASTICITY AT LARGE STRAINS (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 619-633 
    Details
    ISSN: 0029-5981
    Keywords: gradient plasticity ; strain localization ; mixed strain element method ; large strain ; consistent algorithm ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A finite element method for gradient elasto-plastic continuum in which the yield strength of strain hardening/softening materials not only depends on the effective plastic strain but also on its Laplacian is presented. The consistent integration algorithm to update the stress and the internal state variable at integration points and the consistent compliance matrix for the gradient plasticity are formulated in the non-local sense.The methodology to derive the finite element formulation for the gradient plasticity at large strains presented in this paper is applicable to general finite element analysis; the formulation in the context of the two-dimensional four-noded mixed finite element with one integration point and mean von Mises yield criterion is particularly derived.Numerical examples are tested to demonstrate the capability and performance of the present finite element method at large strain in solving for the strain localization problem.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 4
    Electronic Resource
    Electronic Resource
    STRUCTURAL DYNAMIC ANALYSIS BY A TIME-DISCONTINUOUS GALERKIN FINITE ELEMENT METHOD (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 2131-2152 
    Details
    ISSN: 0029-5981
    Keywords: discontinuous Galerkin finite element method ; predictor-multicorrector ; adaptive time integration ; structural dynamics ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper studies a time-discontinuous Galerkin finite element method for structural dynamic problems, by which both displacements and velocities are approximated as piecewise linear functions in the time domain and may be discontinuous at the discrete time levels. A new iterative solution algorithm which involves only one factorization for each fixed time step size and a few iterations at each step is presented for solving the resulted system of coupled equations. By using the jumps of the displacements and the velocities in the total energy norm as error indicators, an adaptive time-stepping procedure for selecting the proper time step size is described. Numerical examples including both single-DOF and multi-DOF problems are used to illustrate the performance of these algorithms. Comparisons with the exact results and/or the results by the Newmark integration scheme are given. It is shown that the time-discontinuous Galerkin finite element method discussed in this study possesses good accuracy (third order) and stability properties, its numerical implementation is not difficult, and the higher computational cost needed in each time step is compensated by use of a larger time step size.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 5
    Electronic Resource
    Electronic Resource
    A postprocessed error estimate and an adaptive procedure for the semidiscrete finite element method in dynamic analysis (1994)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 37 (1994), S. 3585-3603 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In the paper we present a postprocessed type of a posteriori error estimate and a h-version adaptive procedure for the semidiscrete finite element method in dynamic analysis. In space the super-convergent patch recovery technique is used for determining higher-order accurate stresses and, thus, a spatial error estimate. In time a postprocessing technique is developed for obtaining a local error estimate for one step time integration schemes (the HHT-α method). Coupling the error estimate with a mesh generator, a h-version adaptive finite element procedure is presented for two-dimensional dynamic analysis. It updates the spatial mesh and time step automatically so that the discretization errors are controlled within specified tolerances. Numerical studies on different problems are presented for demonstrating the performances of the proposed adaptive procedure.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620372102
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    facet.materialart.
    Unknown
    Investigation of anomalously high transition strength for the 2_{1}^{+} state in ^{174}Os through lifetime measurement (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-11-20
    Description: Author(s): C. B. Li, X. G. Wu, X. F. Li, C. Y. He, Y. Zheng, G. S. Li, S. H. Yao, S. P. Hu, H. W. Li, J. L. Wang, J. J. Liu, C. Xu, J. J. Sun, and W. W. Qu The lifetime of the 2 1 + state in 174 Os was measured in a fast timing experiment using LaBr 3 (Ce) crystals for γ -ray detection. The excellent energy resolution in conjunction with the superb time properties of the new material allows for the reliable handling of the background, thus providing very pre... [Phys. Rev. C 86, 057303] Published Mon Nov 19, 2012
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 7
    facet.materialart.
    Unknown
    Properties of the πh_{11/2} band in the stable nucleus ^{193}Ir (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-05-27
    Description: Author(s): Y. D. Fang, Y. Shi, Y. H. Zhang, B. S. Gao, S. C. Wang, X. H. Zhou, M. L. Liu, J. G. Wang, F. Ma, Y. X. Guo, X. G. Wu, C. Y. He, Y. Zheng, Z. M. Wang, S. C. Li, X. L. Yan, L. He, Z. G. Wang, F. Fang, and F. R. Xu Excited states in the stable nucleus 193 Ir have been investigated through an in-beam γ -ray spectroscopic technique following the 192 Os ( 7 Li , α 2 n ) reaction at a beam energy of 44 MeV. A level scheme built on the π h 11/2 isomer has been extended to high-spin states using eleven newly observed γ transiti... [Phys. Rev. C 83, 054323] Published Thu May 26, 2011
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 8
    facet.materialart.
    Unknown
    Level structure in the transitional nucleus ^{195}Au (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-02-07
    Description: Author(s): S. C. Wang, X. H. Zhou, Y. D. Fang, Y. H. Zhang, N. T. Zhang, B. S. Gao, M. L. Liu, J. G. Wang, F. Ma, Y. X. Guo, S. C. Li, X. L. Yan, L. He, Z. G. Wang, F. Fang, X. G. Wu, C. Y. He, Y. Zheng, Z. M. Wang, G. X. Dong, and F. R. Xu Excited states in 195 Au have been studied experimentally via the 192 Os( 7 Li, 4 n ) reaction at a beam energy of 44 MeV. Based on the γ - γ - t coincidence measurement, a level scheme consisting of 15 new transitions and 10 new levels is established for 195 Au. The triaxial shape-polarizing effect of the hig... [Phys. Rev. C 85, 027301] Published Mon Feb 06, 2012
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 9
    facet.materialart.
    Unknown
    Identification of high-spin states in the stable nucleus ^{195}Pt (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-07-15
    Description: Author(s): Y. D. Fang, Y. H. Zhang, X. H. Zhou, M. L. Liu, J. G. Wang, Y. X. Guo, X. G. Lei, W. Hua, F. Ma, S. C. Wang, B. S. Gao, S. C. Li, X. L. Yan, L. He, Z. G. Wang, F. Fang, X. G. Wu, C. Y. He, Y. Zheng, Z. M. Wang, Y. Shi, and F. R. Xu Excited states of the stable nucleus 195 Pt have been studied using an in-beam γ -ray spectroscopic technique following the incomplete fusion of 7 Li on an 192 Os target at 44 MeV. A level scheme built on the I π =13/2 + isomer has been established up to I π =33/2 − at an excitation energy of about 2.6 MeV. S... [Phys. Rev. C 84, 017301] Published Thu Jul 14, 2011
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    Nonaxial shapes in the odd-odd ^{194}Au nucleus (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-11-17
    Description: Author(s): B. S. Gao, X. H. Zhou, Y. D. Fang, Y. H. Zhang, S. C. Wang, N. T. Zhang, M. L. Liu, J. G. Wang, F. Ma, Y. X. Guo, X. G. Wu, C. Y. He, Y. Zheng, Z. M. Wang, S. C. Li, X. L. Yan, L. He, Z. G. Wang, Y. Zheng, F. Fang, and X. M. Chen High-spin states in the odd-odd 194 Au nucleus have been investigated using the 192 Os( 7 Li,5 n ) reaction at a beam energy of 44 MeV. The previously known structures built on the π h 11/2 −1 ⊗ ν i 13/2 −1 and π h 11/2 −1 ⊗ ν i 13/2 −2 ν j configurations are extended to high-spin states, and a new I π = (20 + ) state associat... [Phys. Rev. C 86, 054310] Published Fri Nov 16, 2012
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...