scholarly journals Evaluation of damping properties of composite mount using a five-element model with variable parameters

2008 ◽  
Author(s):  
H. Andou ◽  
T. Ohkado ◽  
N. Tsujiuchi ◽  
T. Koizumi
Keyword(s):  
Element Model ◽  
Damping Properties ◽  
Variable Parameters ◽  
Evaluation Of Damping

scholarly journals Evaluation of damping properties of structural glass panes under impact loading

2013 ◽  
pp. 113-120 ◽  
Author(s):  
A Ramos ◽  
F Pelayo ◽  
M Lamela ◽  
A Fernández ◽  
M Huerta ◽  
...  
Keyword(s):  
Impact Loading ◽  
Structural Glass ◽  
Damping Properties ◽  
Evaluation Of Damping

Processing for thin-filmed magnesium alloys and evaluation of damping properties

2018 ◽  
Vol 2018.26 (0) ◽  
pp. 717
Author(s):  
Hidetoshi SOMEKAWA ◽  
Kazuhiko IIDA ◽  
Masaki KOBAYASHI ◽  
Takaaki HIBARU
Keyword(s):  
Magnesium Alloys ◽  
Damping Properties ◽  
Evaluation Of Damping

FEM Simulation and Analysis of Variable Parameters for the Three-Roll Cylindrical Bending of Plate Process

2010 ◽  
Vol 160-162 ◽  
pp. 809-814 ◽  
Author(s):  
Jian Hao ◽  
Zhen Luo ◽  
Jian Tao Dong ◽  
J.W. Zhang
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Fem Simulation ◽  
Element Model ◽  
Cylindrical Shape ◽  
Three Dimensional Model ◽  
Variable Parameters ◽  
Roll Bending ◽  
Roll Plate ◽  
Explicit Dynamic

A three-dimensional model is developed to study the dynamic process of three-roll plate bending using finite element method (FEM). In this work, the continuous three-roll bending configuration with cylindrical rolls is used to bend a thick plate into a cylindrical shape. It presents the geometrical setup and the finite element model. This 3D simulation is based on the elastic plastic explicit dynamic FEM under the ANSYS/LS-DYNA environment. Effect of initial strain and change of material properties during deformation is neglected. In order to investigate the influence of parameters on the process, top roller position, friction between rolls and plate, and temperature are also discussed. It is found that the simulation program is a feasible and economical method to study the influence of these parameters, and the FEM simulation can also provide engineers with a convenient analytical tool for optimizing process parameters.

scholarly journals Measurement of Join Patch Properties and Their Integration into Finite-Element Calculations of Assembled Structures

2012 ◽  
Vol 19 (5) ◽  
pp. 1125-1133 ◽  
Author(s):  
A. Schmidt ◽  
S. Bograd ◽  
L. Gaul
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Optimization Procedure ◽  
Element Model ◽  
Material Behavior ◽  
Damping Properties ◽  
Damping Characteristics ◽  
Complex Valued ◽  
Damping Model ◽  
Good Agreement

The vibration and damping characteristics of an assembled structure made of steel are investigated by an experimental modal analysis and compared with the results of a finite element modal analysis. A generic experiment is carried out to evaluate the stiffness and the damping properties of the structure's join patches. Using these results, an appropriate finite element model of the structure is developed where the join patches are represented by thin-layer elements containing material properties which are derived from the generic experiment's results. The joint's stiffness is modeled by orthotropic material behavior whereas the damping properties are represented by the model of constant hysteresis, leading to a complex-valued stiffness matrix. A comparison between the experimental and the numerical modal analysis shows good agreement. A more detailed damping model in conjunction with an optimization procedure for the joint's parameters results in an improved correlation between the experimental and the numerical modal quantities and reveals that the results of the generic experiment are sound.

scholarly journals Empirical Models to Formulate the Nonlinear Response of Rocking Shallow Foundations

2021 ◽  
Author(s):  
Sara Hamidpour ◽  
Hamzeh Shakib ◽  
Roberto Paolucci ◽  
António Correia ◽  
Masoud Soltani
Keyword(s):  
Nonlinear Response ◽  
Nonlinear Behavior ◽  
Element Model ◽  
Empirical Models ◽  
Shallow Foundations ◽  
Stiffness Degradation ◽  
Variable Parameters ◽  
Numerical Investigations ◽  
Macro Element ◽  
Rocking Foundations

Abstract This paper aims to introduce a simplified moment-rotation backbone model for exploring the nonlinear behavior of shallow foundations subjected to rocking. The model is developed based on parametric numerical investigations of rectangular footings on dense dry sand, taking advantage of a nonlinear macro-element model verified based on a set of experimental results. Empirical expressions are proposed for rocking stiffness degradation due to gravity loads and foundation rotation as a function of the factor of safety against vertical loads and aspect ratio of foundations. Similar to previous researches, the uplift reference rotation was introduced to explore a new closedform expression appropriate for normalizing the foundation response in a non-dimensional form. The proposed approach for stiffness degradation and nonlinear backbone model of rocking foundations aims to be simple, to minimize the dependence on the variable parameters, and to provide physically sound selections for engineering applications.

Effect of Cenosphere Filler on Damping Properties of Bamboo-Epoxy Laminated Composites

2014 ◽  
Vol 23 (1) ◽  
pp. 096369351402300 ◽  
Author(s):  
Hemalata Jena ◽  
Arun Kumar Pradhan ◽  
Mihir Kumar Pandit
Keyword(s):  
Natural Frequency ◽  
Damping Ratio ◽  
Natural Fibre ◽  
Damping Properties ◽  
Weight Percentage ◽  
Number Of Layers ◽  
Fibre Composites ◽  
Particulate Filler ◽  
Set Up ◽  
Evaluation Of Damping

This paper deals with evaluation of damping properties of natural fibre composites consisting of bamboo fibre as reinforcement, epoxy as matrix and cenosphere as particulate filler. Hand lay-up technique is used to fabricate the composites with varying number of layers and different weight percentage of cenosphere filler. The prepared specimens are subjected to free vibration test (FVT) to investigate the damping ratio and natural frequency. Damping of the bamboo–epoxy composites is analysed experimentally using cantilever beam test set up by impulse technique. The investigation reveals that the number of layers and cenosphere filler content influences the natural frequency and the damping ratio.

DMA Evaluation of Damping Properties of Shape Memory Alloys

2003 ◽  
Vol 2003.1 (0) ◽  
pp. 255-256
Author(s):  
Hideki HOSODA ◽  
Masahiro TSUJI ◽  
Tomonari INAMURA ◽  
Kenji WAKASHIMA ◽  
Shuichi MIYAZAKI
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Damping Properties ◽  
Evaluation Of Damping

0206 Evaluation of Damping Properties of Composite Mount using Maxwell Model

2007 ◽  
Vol 2007.7 (0) ◽  
pp. 23-24
Author(s):  
Nobutaka TSUJIUCHI ◽  
Takayuki KOIZUMI ◽  
Takudou OHKADO ◽  
Hiroaki ANDOU
Keyword(s):  
Maxwell Model ◽  
Damping Properties ◽  
Evaluation Of Damping

scholarly journals Instability due to internal damping of rotating shafts

2012 ◽  
Vol 3 (2) ◽  
pp. 123-127
Author(s):  
W. Lemahieu ◽  
M. Loccufier ◽  
B. Vervisch ◽  
P. De Baets
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Experimental Approach ◽  
Element Model ◽  
Internal Damping ◽  
Damping Properties ◽  
Resonance Frequencies ◽  
Hysteretic Damping ◽  
Rotating Shafts ◽  
General Relations

Rotor internal damping has been indicated as one of the main causes of instability in rotatingmachinery for more than a century. However, the exact characterisation of this damping is still an unsolvedresearch topic. Therefore, in this thesis the consequences of material damping in rotating shafts areexamined more in depth. Two main steps are considered. Firstly, a finite element model of the beam,including viscous and hysteretic damping, is constructed. This model allows to calculate the thresholdspeed of instability and the resonance frequencies of a shaft. Furthermore it allows to vary the dampingparameters and to compare the considered models giving an indication of the general relations betweeninstability and damping properties. Secondly, an experimental approach should elucidate which model fitsbest for the physical damping. In general, the main purpose is to gain new insights into how the dampingshould really be modelled to have the most accurate and safe prediction of a designed rotor.

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