Optimization of Flexible Multibody Dynamic Systems Using Equivalent Static Load Method

2004 ◽  
Vol 28 (1) ◽  
pp. 48-54
Keyword(s):  
Dynamic Systems ◽  
Static Load ◽  
Equivalent Static Load ◽  
Multibody Dynamic ◽  
Flexible Multibody

Optimization of Flexible Multibody Dynamic Systems Using the Equivalent Static Load Method

AIAA Journal ◽  
2005 ◽  
Vol 43 (4) ◽  
pp. 846-852 ◽  
Author(s):  
B. S. Kang ◽  
G. J. Park ◽  
J. S. Arora
Keyword(s):  
Dynamic Systems ◽  
Static Load ◽  
Equivalent Static Load ◽  
Multibody Dynamic ◽  
Flexible Multibody

Modeling Controlled Articulated Flexible Systems Using Assumed Modes: Part II — Numerical Investigation

2001 ◽  
Author(s):  
Theodore G. Mordfin ◽  
Sivakumar S. K. Tadikonda
Keyword(s):  
Multibody Dynamics ◽  
Dynamic Systems ◽  
Flexible Multibody Dynamics ◽  
Companion Paper ◽  
Parameter Variation ◽  
Flexible Bodies ◽  
Simulation Efficiency ◽  
Multibody Dynamic ◽  
Flexible Multibody ◽  
Assumed Mode

Abstract Guidelines are sought for generating component body models for use in controlled, articulated, flexible multibody dynamics system simulations. In support of this effort, exact truth models and linearized large-articulation models are developed in a companion paper. The purpose of the truth models is to aid in evaluating the use of various types of component body assumed modes in the large-articulation models. The assumed mode models are analytically evaluated from the perspectives of both structural dynamics and multibody dynamics. In this paper, component body assumed modes are tested in a linearized large-articulation model. The numerical behavior of the model and its performance in the presence of parameter variation is investigated and explained. The results show that high accuracy, high simulation efficiency, and numerical robustness cannot be simultaneously achieved. However, in many cases, satisfactory levels of all three are achievable. Guidelines are proposed for modeling the flexible bodies in controlled-articulation flexible multibody dynamic systems.

Determination of Significance of Stress Stiffening Effects in Flexible Multibody Dynamic Systems

1992 ◽  
Author(s):  
Jeha Ryu ◽  
Sang Sup Kim ◽  
Sung-Soo Kim
Keyword(s):  
Dynamic Simulation ◽  
Dynamic Systems ◽  
Stiffness Matrix ◽  
Multibody Systems ◽  
Flexible Body ◽  
Multibody Dynamic ◽  
Flexible Multibody ◽  
Multibody Dynamic System ◽  
Modal Stress

Abstract This paper presents a criterion for determining whether or not a flexible multibody dynamic system reveals stress stiffening effects. In the proposed criterion, the eigenvalue variation that results from adding the modal stress stiffness matrix to the conventional linear modal stiffness matrix is examined numerically before actual dynamic simulation. If the variation is sufficiently large for any flexible body, then stress stiffening effects are said to be significant and must be included in dynamic simulation of flexible multibody systems. Since the criterion uses the most general stress stiffness matrix, which can be represented as a function of applied and constraint reaction loads as well as of a system of 12 inertial loads, this criterion is applicable to any general flexible multibody dynamic systems. Several numerical results are presented to show the effectiveness of the proposed criterion.

A General Approach to Stress Stiffening Effects on Flexible Multibody Dynamic Systems∗

1994 ◽  
Vol 22 (2) ◽  
pp. 157-180 ◽  
Author(s):  
Jeha Ryu ◽  
Sang-Sup Kim ◽  
Sung-Soo Kim
Keyword(s):  
Dynamic Systems ◽  
Multibody Dynamic ◽  
Flexible Multibody

Truth Models for Articulating Flexible Multibody Dynamic Systems

2000 ◽  
Vol 23 (5) ◽  
pp. 805-811 ◽  
Author(s):  
Theodore G. Mordfin ◽  
Sivakumar S. K. Tadikonda
Keyword(s):  
Dynamic Systems ◽  
Multibody Dynamic ◽  
Flexible Multibody
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