Dynamic Analysis of Flexible Structures using Extended Bond Graphs

1992 ◽  
Author(s):  
Chiaming Yen ◽  
Glenn Y. Masada
Keyword(s):  
Dynamic Analysis ◽  
Flexible Structures ◽  
Bond Graphs

A Study on the Use of Reduced Order Models for Unsteady Fluid Dynamic Analysis of Flexible Structures

2012 ◽  
Author(s):  
L. Ebrahimnejad ◽  
H. Yadollahi Farsani ◽  
D. T. Valentine ◽  
K. D. Janoyan ◽  
P. Marzocca
Keyword(s):  
Dynamic Analysis ◽  
Cross Sections ◽  
Fluid Dynamic ◽  
Flexible Structures ◽  
Reduced Order Models ◽  
Computationally Efficient ◽  
Reduced Order ◽  
Long Span ◽  
Long Span Bridge ◽  
Unsteady Fluid

Reduced order models (ROMs) are computationally efficient techniques, which have been widely used for predicting unsteady aerodynamic response of airfoils and wings. However, they have not been applied extensively to perform unsteady fluid dynamic analysis of flexible structures in civil engineering. This paper discusses the application of reduced order computational fluid dynamics (CFD) model based on the eigensystem realization algorithm (ERA) in the aerodynamic analysis of flexible structures with arbitrary shaped cross sections. As an example of a civil structure we examine the GBB long-span bridge for which there are published experimental data. The aerodynamic impulse responses of the GBB Bridge are used to construct the ROM, and then the aerodynamic forces due to arbitrary inputs are evaluated and compared to those of the model coupled with an advanced CFD code. Results demonstrate reasonable prediction power and high computational efficiency of the technique that can serve for preliminary design, optimization and control purposes. The methodology described in this paper has wide application in many offshore engineering problems where flexible structures interact with unsteady fluid mechanical phenomena.

scholarly journals Dynamic Analysis of Stewart Platform by Bond Graphs

2015 ◽  
Vol 100 ◽  
pp. 226-233 ◽  
Author(s):  
Vjekoslav Damic ◽  
Maida Cohodar
Keyword(s):  
Dynamic Analysis ◽  
Stewart Platform ◽  
Bond Graphs

Dynamic analysis of a two-link flexible manipulator system using Extended Bond Graphs

1993 ◽  
Vol 330 (6) ◽  
pp. 1113-1134 ◽  
Author(s):  
Chiaming Yen ◽  
Glenn Y. Masada ◽  
Wei-Min Chan
Keyword(s):  
Dynamic Analysis ◽  
Flexible Manipulator ◽  
Bond Graphs

An Automated Graph Grammar Based Tool to Automatically Generate System Bond Graphs for Dynamic Analysis

2016 ◽  
Author(s):  
Daniel Grande ◽  
Felice Mancini ◽  
Pradeep Radhakrishnan
Keyword(s):  
Dynamic Analysis ◽  
Bond Graph ◽  
Graph Grammar ◽  
Search Process ◽  
Bond Graphs ◽  
System Components ◽  
Grammar Rules ◽  
Algorithmic Search ◽  
Representation Scheme ◽  
Automated Tool

This paper presents a graph grammar based automated tool that can generate bond graphs of various systems for dynamic analysis. A generic graph grammar based representation scheme has been developed for different system components and bond graph elements. Using that representation, grammar rules have been developed that enable interpreting a given system and generating bond graph through an algorithmic search process. Besides, the paper also demonstrates the utility of the proposed tool in classrooms to enhance value in bond graph based system dynamics education. The underlying technique, various examples and benefits of this automated tool will be highlighted.

scholarly journals A Spatial Euler-Bernoulli Beam Element for Rigid-Flexible Coupling Dynamic Analysis of Flexible Structures

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Zhigang Zhang ◽  
Zhaohui Qi ◽  
Zhigang Wu ◽  
Huiqing Fang
Keyword(s):  
Dynamic Analysis ◽  
Cross Sections ◽  
Degrees Of Freedom ◽  
Flexible Structures ◽  
Nonlinear Dynamic Analysis ◽  
Beam Element ◽  
Small Time ◽  
Time Interval ◽  
Slender Beams ◽  
New Formulation

A two-node spatial beam element with the Euler-Bernoulli assumption is developed for the nonlinear dynamic analysis of slender beams undergoing arbitrary rigid motions and large deformations. During the analysis, the global displacement and rotation vectors with six degrees of freedom are selected as the nodal coordinates. In addition, the “shear locking” problem is avoided successfully since the beam cross-sections are always perpendicular to the current neutral axes by employing a special coupled interpolation of the centroid position and the cross-section orientation. Then a scheme is presented where the original transient strains representing the nodal forces are replaced by proposed average strains over a small time interval. Thus all the high frequencies can be filtered out and a corresponding equivalent internal damping will be produced in this new formulation, which can improve the computation performance of the proposed element for solving the stiff problem and evaluate the governing equations even by using the nonstiff ordinary differential equation solver. Finally, several numerical examples are carried out to verify the validation and efficiency of this proposed formulation by comparison with the analytical solutions and other research works.

Dynamic Analysis of Offshore Wind Turbine Structures

2017 ◽  
pp. 116-191
Author(s):  
Arundhuti Banerjee ◽  
Tanusree Chakraborty ◽  
Vasant Matsagar ◽  
Tushar Kanti Datta
Keyword(s):  
Dynamic Analysis ◽  
Wind Turbine ◽  
Flexible Structures ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Computational Aspect ◽  
Ideal Condition ◽  
Strong Wind ◽  
Finite Element Software ◽  
Strong Dynamic

Wind turbines are slender flexible structures susceptible to strong wind fluctuations. The flexible wind turbine structure, when subjected to strong dynamic forces, it leads to an ideal condition for induced vibrations and resonance problems. Hence studying the dynamic response of these critical structures using the computational and experimental procedures becomes of utmost importance. This chapter reviews the theories used for the dynamic analysis of a modern day offshore wind turbine structure and applies these theories in analyzing realistic situations for offshore turbines under wave and wind action. The first half of the chapter gives a broad overview on the concepts of structural dynamics of wind turbine structures with illustrative examples that will enable the user to understand the methodology used to analyze these structures. The latter half of the chapter deals with the computational aspect of the analysis and focuses on the use of finite element software ANSYS 14 to model these critical structures.

Dynamic Analysis of Rigid-Body Mechanisms Mounted on Flexible Support Structures — Planar Case

2006 ◽  
Vol 505-507 ◽  
pp. 589-594 ◽  
Author(s):  
Huai Ku Sun ◽  
Cun Gin Chen ◽  
Yu Chen Shen
Keyword(s):  
Rigid Body ◽  
Dynamic Analysis ◽  
Flexible Structures ◽  
Three Dimensional ◽  
Support Structures ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Planar Case ◽  
Flexible Support ◽  
Future Work

Computer-aided analysis of rigid-body mechanisms is combined with the finite element analysis of flexible structures to develop a computer model and derive the equation of motion, incorporating the Lagrange multiplier, to be used in the dynamic analysis of multi-rigid-body mechanisms mounted on flexible support structures. The resulting equations are solved by numerical integration. Predicting and analyzing the performance of the full system, including the motion of the system components and the forcing condition, during the engineering design process will promote the success of the entire system. Finally, a machine gun system with a flexible mount is given as a numerical example. The results reveal that the interaction between the rigid-body mechanisms and its flexible support structures importantly determines the performance of whole system. This study considers only the planar case. Our future work will propose a more complicated fully three-dimensional model.

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