نتایج جستجو برای: stiffness matrices

تعداد نتایج: 117462  

2007
N. Geffroy L. Brunetti B. Bolzon A. Jeremie J. Lottin

This paper describes one part of the work done by the LAViSta group (Laboratories in Annecy working on Vibration and Stabilisation), dedicated to the modelling and simulation aspects. The first chapter deals with the finite element modelling of the mechanical structure. This step is very important in order to obtain the most representative model. Thus the structure is entirely described by the ...

2013
MARCIN KUJAWA M. Kujawa

Abstract: Elastic and geometric stiffness matrices were derived using Castigliano’s first theorem, for the case of torsion of restrained thin-walled bars of open constant bisymmetric crosssection. Functions which describe the angles of torsion were adopted from the solutions of the differential equation for restrained torsion. The exact solutions were simplified by expanding them in a power ser...

2015
Jiashang Jiang

Model updating is an inverse eigenvalue problem which concerns the modification of an existing but inaccurate model with measured modal data. In this paper, an efficient gradient based iterative method for updating the mass, damping and stiffness matrices simultaneously using a few of complex measured modal data is developed. Convergence analysis indicates that the iterative solutions always co...

2005
Firdaus E. Udwadia

In this paper we present a simple, yet powerful, method for the identification of stiffness matrices of structural and mechanical systems from information about some of their measured natural frequencies and corresponding mode shapes of vibration. The method is computationally efficient and is shown to perform remarkably well in the presence of measurement errors in the mode shapes of vibration...

2013
Jianguo Xin Wei Cai Nailong Guo

Hierarchical bases of arbitrary order for H(div)-conforming triangular and tetrahedral elements are constructed with the goal of improving the conditioning of the mass and stiffness matrices. For the basis with the triangular element, it is found numerically that the conditioning is acceptable up to the approximation of order four, and is better than a corresponding basis in the dissertation by...

2007
Dequand Sylvie

This study deals with an application of the proper orthogonal decomposition (POD) method to a simplified structural dynamic system with local known non-linearities. The POD method is applied to experimental and simulated time-series data, in order to extract modes that efficiently represent the system. The ability of these modes to detect and identify structural non-linear behaviours is then in...

2017
Hana Andrlová Justin Mastroianni Josef Madl Johannes S. Kern Wolfgang Melchinger Heide Dierbach Florian Wernet Marie Follo Kristin Technau-Hafsi Cristina Has Venugopal Rao Mittapalli Marco Idzko Ricarda Herr Tilman Brummer Hendrik Ungefroren Hauke Busch Melanie Boerries Andreas Narr Gabriele Ihorst Claire Vennin Annette Schmitt-Graeff Susana Minguet Paul Timpson Justus Duyster Frank Meiss Winfried Römer Robert Zeiser

Novel targeted and immunotherapeutic approaches have revolutionized the treatment of metastatic melanoma. A better understanding of the melanoma-microenvironment, in particular the interaction of cells with extracellular matrix molecules, may help to further improve these new therapeutic strategies.We observed that the extracellular matrix molecule biglycan (Bgn) was expressed in certain human ...

2014
Bedřich Sousedík Roger G. Ghanem

Stochastic Galerkin finite element discretizations of partial differential equations with coefficients characterized by arbitrary distributions lead, in general, to fully block dense linear systems. We propose two novel strategies for constructing preconditioners for these systems to be used with Krylov subspace iterative solvers. In particular, we present a variation of the hierarchical Schur ...

Journal: :Cell reports 2014
Fanny A Pelissier James C Garbe Badriprasad Ananthanarayanan Masaru Miyano ChunHan Lin Tiina Jokela Sanjay Kumar Martha R Stampfer James B Lorens Mark A LaBarge

Dysfunctional progenitor and luminal cells with acquired basal cell properties accumulate during human mammary epithelial aging for reasons not understood. Multipotent progenitors from women aged <30 years were exposed to a physiologically relevant range of matrix elastic modulus (stiffness). Increased stiffness causes a differentiation bias towards myoepithelial cells while reducing production...

Journal: :Cortex; a journal devoted to the study of the nervous system and behavior 2007
Jason Friedman Tamar Flash

Object manipulation with the hand is a complex task. The task has redundancies at many levels, allowing many possibilities for the selection of grasp points, the orientation and posture of the hand, the forces to be applied at each fingertip and the impedance properties of the hand. Despite this inherent complexity, humans perform object manipulation nearly effortlessly. This article presents e...

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