Finite element analysis of maneuvering spacecraft truss structures

1989 ◽  
Vol 32 (6) ◽  
pp. 1403-1411
Author(s):  
E.R. Christensen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Truss Structures ◽  
Element Analysis ◽  
Maneuvering Spacecraft

scholarly journals Stiffness prediction for bolted moment-connections in cold-formed steel trusses

2020 ◽  
Vol 41 (1) ◽  
Author(s):  
Apai Benchaphong ◽  
Rattanasak Hongthong ◽  
Sutera Benchanukrom ◽  
Nirut Konkong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analytical Method ◽  
Truss Structures ◽  
Rotational Stiffness ◽  
Element Analysis ◽  
Moment Connection ◽  
Rigid Connection ◽  
Cold Formed Steel ◽  
Steel Trusses

The purpose of this research was to study the behavior of cold-formed steel cantilever truss structures. A cantilever truss structure and bolt-moment connection were tested and verified by the 3D-finite element model. The verification results showed a good correlation between an experimental test and finite element analysis. An analytical method for elastic rotational stiffness of bolt-moment connection was proposed. The equation proposed in the analytical method was used to approximate the elastic rotational stiffness of the bolt group connection, and was also applied to the Richard-Abbott model for generating the nonlinear moment-rotation curve which modeled the semi-rigid connection stiffness. The 2D-finite element analysis was applied to study the behavior of the truss connection, caused by semi-rigid connection stiffness which caused a change of force to the truss elements. The results showed that the force in the structural members increased by between 13.62%-74.32% of the axial forces, and the bending moment decreased by between 33.05%-100%. These results strongly suggest that the semi-rigid connection between cold-formed steel cantilever truss structures should be considered in structural analysis to achieve optimum design, acknowledging this as the real behavior of the structure.

Finite Element Analysis of Structures with Interval Parameters

2007 ◽  
Vol 23 (1) ◽  
pp. 79-85 ◽  
Author(s):  
W. Gao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Responses ◽  
Structural Parameters ◽  
Mean Value ◽  
Truss Structures ◽  
Element Analysis ◽  
Interval Change ◽  
Interval Parameters ◽  
Factor Method

AbstractThis paper present a new method called the interval factor method for the finite element analysis of truss structures with interval parameters. Using the interval factor method, the structural parameters and loads can be considered as interval variables, and the structural stiffness matrix can then be divided into the product of two parts corresponding to its deterministic value and the interval factors. The computational expressions for lower and upper bounds, mean value and interval change ratio of structural placement and stress responses are derived from the static governing equations by means of the interval operations. The effect of the uncertainty of the structural parameters and loads on the structural static responses is demonstrated by truss structures.

scholarly journals Design and analysis of uptilted aerial ladder for fire truck format

2018 ◽  
Vol 207 ◽  
pp. 02009 ◽  
Author(s):  
Zhi-Jian Tian ◽  
Xiang-Qin Han ◽  
Lei Xu ◽  
Li-Juan Yan ◽  
Chong-Yi Wei ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Altitude ◽  
Working Condition ◽  
Experimental Results ◽  
Truss Structures ◽  
Original Design ◽  
Element Analysis ◽  
Practical Solution ◽  
Thin Walled

Aerial ladder fire truck is a kind of fire-fighting truck which is used for rescue of people and goods from high altitude locations. The aerial ladders of the fire truck are typically nested U-shaped truss structures manufactured with thin-walled steel by welding. Compared with close-shaped truss structures, their stiffnesses are relatively low. This means that they are quite slender structures, and they will deflect quite significantly due to their own weight and the working loads applied. If the original design of the ladder is straight, then the ladder will deform to a ‘fishing-rod’ shape in the air. The consequent ‘bent-down’ shape of the deformed ladder causes significant inconvenience during rescuing operations. To deal with this issue, a practical solution to the problem is that the ladder is manufactured with an appropriate uptilted curved shape, and it could deform to an approximately straight ladder when it is under certain desired working condition. In this paper, the effectiveness of the curved ladder design proposed in this paper has been validated by both finite element analysis and experimental results.

Interval Finite Element Computation Based on INTLAB for Statical Analysis of Truss Structures with Large Uncertainties

2011 ◽  
Vol 243-249 ◽  
pp. 6955-6955
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Environmental Engineering ◽  
Truss Structures ◽  
Element Analysis ◽  
Interval Approach ◽  
Academic Faculty ◽  
Element Computation ◽  
Institute Of Technology ◽  
Finite Element Computation

Nondeterministic Linear Static Finite Element Analysis: An Interval Approach A Thesis Presented to The Academic Faculty By Hao Zhang School of Civil and Environmental Engineering Georgia Institute of Technology December 2005

scholarly journals 3D printable biomimetic rod with superior buckling resistance designed by machine learning

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Adithya Challapalli ◽  
Guoqiang Li
Keyword(s):  
Machine Learning ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Truss Structures ◽  
Human Beings ◽  
Feature Identification ◽  
Element Analysis ◽  
Structural Capacity ◽  
Buckling Resistance ◽  
3D Printed

AbstractOur mother nature has been providing human beings with numerous resources to inspire from, in building a finer life. Particularly in structural design, plenteous notions are being drawn from nature in enhancing the structural capacity as well as the appearance of the structures. Here plant stems, roots and various other structures available in nature that exhibit better buckling resistance are mimicked and modeled by finite element analysis to create a training database. The finite element analysis is validated by uniaxial compression to buckling of 3D printed biomimetic rods using a polymeric ink. After feature identification, forward design and data filtering are conducted by machine learning to optimize the biomimetic rods. The results show that the machine learning designed rods have 150% better buckling resistance than all the rods in the training database, i.e., better than the nature’s counterparts. It is expected that this study opens up a new opportunity to design engineering rods or columns with superior buckling resistance such as in bridges, buildings, and truss structures.

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