A New Approach to Simulating the Trajectory of Solar Sail Spacecraft Using the Finite Element Method

2015 ◽  
Author(s):  
Alex A. Karwas ◽  
Ray Taghavi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Solar Sail ◽  
The Finite Element Method ◽  
New Approach ◽  
Element Method

Transient Dynamic Analysis of Rotors Using the Combined Methodologies of Finite Elements and Transfer Matrix

1988 ◽  
Vol 55 (2) ◽  
pp. 448-452 ◽  
Author(s):  
R. Subbiah ◽  
A. S. Kumar ◽  
T. S. Sankar
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Elements ◽  
Transfer Matrix ◽  
Computational Effort ◽  
The Finite Element Method ◽  
Transient Dynamic Analysis ◽  
New Approach ◽  
System Properties ◽  
Element Method

A new approach is proposed to predict the dynamic behavior of rotor-bearing systems in time domain using the combined methodologies of finite elements and transfer matrices. This approach makes use of the finite element method to model symmetric shafts and then transforms the system properties to transfer matrix mode. The formulation provides flexibility to include both linear and nonlinear system models, often encountered in rotor dynamic applications. Few example rotor cases had been studied and the results were compared with those obtained using finite element method. This establishes that considerable savings in computational effort can be achieved without losing any accuracy.

New Measuring Method of Axisymmetric Three-Dimensional Residual Stresses Using Inherent Strains as Parameters

1986 ◽  
Vol 108 (4) ◽  
pp. 328-334 ◽  
Author(s):  
Yukio Ueda ◽  
Keiji Fukuda ◽  
You Chul Kim
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Residual Stresses ◽  
Three Dimensional ◽  
Measuring Method ◽  
Basic Theory ◽  
The Finite Element Method ◽  
New Approach ◽  
Practical Procedure ◽  
Element Method

For the measurement of axisymmetric three-dimensional residual stresses, Sachs’ method is often used. The accuracy of this method is not high when even small errors are contained in observed strains. In 1975, the authors presented a new approach for the measurement of residual stresses in which inherent strains (the source of residual stresses) are dealt with as parameters and formulated a basic theory using the finite element method. In this paper, based on the new approach, a basic theory for the measurement of axisymmetric three-dimensional residual stresses is developed and a practical procedure of measurement is presented. This method is applied to determine the residual stresses in a quenched shaft and its reliability and practicability are also demonstrated.

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