Dynamic Substructuring of Geometrically Nonlinear Finite Element Models Using Residual Flexibility Modes

Author(s):  
Morteza Karamooz Mahdiabadi ◽  
Erhard Buchmann ◽  
Duo Xu ◽  
Andreas Bartl ◽  
Daniel Jean Rixen
AIAA Journal ◽  
2016 ◽  
Vol 54 (2) ◽  
pp. 691-702 ◽  
Author(s):  
Robert J. Kuether ◽  
Matthew S. Allen ◽  
Joseph J. Hollkamp

PAMM ◽  
2018 ◽  
Vol 18 (1) ◽  
Author(s):  
Morteza Karamooz Mahdiabadi ◽  
Francesco De Crescenzo ◽  
Christian H. Meyer ◽  
Daniel J. Rixen

AIAA Journal ◽  
2017 ◽  
Vol 55 (5) ◽  
pp. 1695-1706 ◽  
Author(s):  
Robert J. Kuether ◽  
Matthew S. Allen ◽  
Joseph J. Hollkamp

1999 ◽  
Vol 123 (1) ◽  
pp. 33-42 ◽  
Author(s):  
A. Saxena ◽  
G. K. Ananthasuresh

Optimal design methods that use continuum mechanics models are capable of generating suitable topology, shape, and dimensions of compliant mechanisms for desired specifications. Synthesis procedures that use linear elastic finite element models are not quantitatively accurate for large displacement situations. Also, design specifications involving nonlinear force-deflection characteristics and generation of a curved path for the output port cannot be realized with linear models. In this paper, the synthesis of compliant mechanisms is performed using geometrically nonlinear finite element models that appropriately account for large displacements. Frame elements are chosen because of ease of implementation of the general approach and their ability to capture bending deformations. A method for nonlinear design sensitivity analysis is described. Examples are included to illustrate the usefulness of the synthesis method.


Author(s):  
Naveen Viswanatha ◽  
Mark Avis ◽  
Moji Moatamedi

The surround and the spider of the loudspeaker suspension are modelled in ANSYS to carry out finite element analysis. The displacement dependent nonlinearities arising from the suspension are studied and the material and geometric effects leading to the nonlinearities are parameterised. The ANSYS models are simulated to be excited by a sinusoidal load and the results are evaluated by comparison with the results obtained by a physical model. The paper illustrates how practical models can be analysed using cost effective finite element models and also the extension of the models to experiment on various parameters, like changing the geometry for optimisation, by computer simulation.


Author(s):  
Jeongsoo Kim ◽  
Yeon-Ju Jeong ◽  
Min-Su Park ◽  
Sunghoon Song

Abstract This study introduces a large offshore cofferdam installed by suction, unlike conventional ones such as a sheet-pile type, and proposes an effective suction cap for the cofferdam. In structural design view of the cofferdam, there are several critical issues due to its large size. This study conducted structural analyses of stiffened caps for large offshore suction cofferdam using fully nonlinear finite element models, and analyzed changes in behaviors of the cap due to stiffener arrangements to provide design insights. For finite element models, the diameter and the thickness of the suction cap (circular plate only) are 20m and 0.07m, respectively. Suction pressure on the cap was assumed to be 100kPa, all parts of the cofferdam except the cap are considered as boundary conditions. By investigating conventional suction anchors, several stiffener arrangement patterns on the cap of suction cofferdam were derived, and each arrangement was estimated by comparing stress and deformation of the cap. Also, reaction distributions on the edge of the cap were investigated to analyze effects of the stiffener arrangement on the interface behaviors between cap and cofferdam.


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