Finite element analysis of natural convection in a triangular enclosure: Effects of various thermal boundary conditions

2007 ◽  
Vol 62 (9) ◽  
pp. 2623-2640 ◽  
Author(s):  
Tanmay Basak ◽  
S. Roy ◽  
Ch. Thirumalesha
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Natural Convection ◽  
Boundary Conditions ◽  
Element Analysis ◽  
Thermal Boundary Conditions ◽  
Triangular Enclosure

Analysis of the Thermal Behavior of a Ball Screw Based on Simulation and Experimental Investigation

2014 ◽  
Vol 577 ◽  
pp. 140-144
Author(s):  
Zi Han Li ◽  
Kai Guo Fan ◽  
Jian Guo Yang
Keyword(s):  
Finite Element Analysis ◽  
Experimental Investigation ◽  
Finite Element ◽  
Boundary Conditions ◽  
Thermal Behavior ◽  
Temperature Variation ◽  
Ball Screw ◽  
Variation Pattern ◽  
Element Analysis ◽  
Thermal Boundary Conditions

Thermal expansion of ball screw system affects the machining accuracy of machine tools significantly. The objective of this paper is to analyze the thermal behavior and predict the temperature variation pattern of a ball screw based on finite element analysis and experimental investigation. Wireless temperature sensors are used to monitor the temperature variation of the ball screw system under different thermal conditions during both the warm-up and cooldown phases, so as to investigate its temperature variation pattern. Then an exponential algorithm is proposed to analyze and predict the temperature variation of the ball screw based on finite element analysis, and the actual thermal boundary conditions of the ball screw system are exactly defined according to the proposed algorithm and the experimental results. Finally, it was found that the simulation based on the thermal boundary conditions identified herein could match quite well with the experimental results.

Rayleigh-Ritz Analysis of Vibrating Plates Based on a Class of Eigenfunctions

2009 ◽  
Author(s):  
Giuseppe Catania ◽  
Silvio Sorrentino
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Boundary Conditions ◽  
Linear Combination ◽  
Equation Of Motion ◽  
Extensive Literature ◽  
Shape Functions ◽  
Element Analysis ◽  
Vibrating Plates ◽  
General Basis

In the Rayleigh-Ritz condensation method the solution of the equation of motion is approximated by a linear combination of shape-functions selected among appropriate sets. Extensive literature dealing with the choice of appropriate basis of shape functions exists, the selection depending on the particular boundary conditions of the structure considered. This paper is aimed at investigating the possibility of adopting a set of eigenfunctions evaluated from a simple stucture as a general basis for the analysis of arbitrary-shaped plates. The results are compared to those available in the literature and using standard finite element analysis.

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