نتایج جستجو برای: stiffness matrices

تعداد نتایج: 117462  

2014
J. H. Lee J. Kim Joon-Hyun Lee

A technique to identifY damping parameters directly from the frequency response functions (FRF) in matrix forms has been developed. Furtl1ermore, the technique identifies the viscous damping and structural damping coefficients separately. The technique provides more accurate damping values because it does not rely on the information of the natural modes as in the conventional method. The dampin...

2005
Yuen-Cheng Kuo Wen-Wei Lin Shu-Fang Xu

Finite element model correction of quadratic eigenvalue problems (QEPs) using a symmetric eigenstructure assignment technique is proposed by Zimmerman and Widengren 1989, which incorporates the measured model data into the finite element model to produce an adjusted finite element model on the damping and stiffness matrices that matches the experimental model data, and minimizes the distance be...

In this paper, condition monitoring of a geared rotor system using finite element (FE) model updating and particle swarm optimization (PSO) method is onsidered. For this purpose, employing experimental data from the geared rotor system, an updated FE model is obtained. The geared rotor system under study consists of two shafts, four bearings, and two gears. To get the experimental data,  iezoel...

1995
W. Stamps Howard Milos Zefran Vijay Kumar

In this paper, methods of differential geometry and properties of Lie groups are used to show that in any conservative system subjected to a non zero external load, if one examines motions in SE(3), the special Euclidean group of rigid body motions in three dimensions, the resulting 6 ́6 stiffness matrix is asymmetric in any inertial (fixed) or body-fixed reference frame. We prove that in any su...

2015
Vanesa Vicens-Zygmunt Susanna Estany Adai Colom Ana Montes-Worboys Carlos Machahua Andrea Juliana Sanabria Roger Llatjos Ignacio Escobar Frederic Manresa Jordi Dorca Daniel Navajas Jordi Alcaraz Maria Molina-Molina

BACKGROUND There is growing interest in the development of cell culture assays that enable the rigidity of the extracellular matrix to be increased. A promising approach is based on three-dimensional collagen type I matrices that are stiffened by cross-linking through non-enzymatic glycation with reducing sugars. METHODS The present study evaluated the biomechanical changes in the non-enzymat...

2016
Craig E. Barcus Patricia J. Keely Kevin W. Eliceiri Linda A. Schuler

Estrogen receptor α positive (ERα+) breast cancer accounts for most breast cancer deaths. Both prolactin (PRL) and extracellular matrix (ECM) stiffness/density have been implicated in metastatic progression of this disease. We previously demonstrated that these factors cooperate to fuel processes involved in cancer progression. Culture of ERα+ breast cancer cells in dense/stiff 3D collagen-I ma...

2003
Rodney G. Roberts Theresa A. Shirey

Achieving adequate force control is an important problem in the application of robotics technology to manufacturing tasks. This is particularly true for assembly tasks that require constrained interaction between a robotic manipulator and a workpart. One approach to this problem is the use of passive compliance. A number of methods have been proposed for designing a passive compliance mechanism...

Journal: :Biophysical journal 2009
Tilo Pompe Stefan Glorius Thomas Bischoff Ina Uhlmann Martin Kaufmann Sebastian Brenner Carsten Werner

Extracellular matrices determine cellular fate decisions through the regulation of intracellular force and stress. Previous studies suggest that matrix stiffness and ligand anchorage cause distinct signaling effects. We show herein how defined noncovalent anchorage of adhesion ligands to elastic substrates allows for dissection of intracellular adhesion signaling pathways related to matrix stif...

Journal: :Earth and Space Science 2022

Numerical modeling of the 3D acoustic wave equation regularly faces a trade-off between accuracy and efficiency. Usually, an improved computational efficiency leads to compromised numerical accuracy, in which dispersion error increases. Such is commonly reported for finite difference methods, consistent, lumped, eclectic element matrices, high-order spectral methods. Therefore, we present metho...

Journal: :Mechanisms and machine science 2022

The scattering of guided waves through a coupling region is crucial information when studying waveguides. In this paper, the second strain gradient theory (SSG) used to describe wave transmission and reflection in three-dimensional micro-sized medium. First, constitutive relation 3D SSG model derived while six quintic Hermite polynomial shape functions are for displacement field. Then Hamilton’...

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