Thermal expansion imaging and finite element simulation of hot lines in high power AlGaN HEMT devices

2004 ◽  
Vol 35 (3-6) ◽  
pp. 477-484 ◽  
Author(s):  
D. Dietzel ◽  
R. Meckenstock ◽  
S. Chotikaprakhan ◽  
J. Bolte ◽  
J. Pelzl ◽  
...  
Keyword(s):  
Finite Element ◽  
Thermal Expansion ◽  
Finite Element Simulation ◽  
High Power ◽  
Element Simulation

Effects of Imperfections on Bifurcation of Multi-Layer Microstructures of MEMS under Thermal Loading

2007 ◽  
Vol 339 ◽  
pp. 276-280
Author(s):  
Y.T. Yu ◽  
Wei Zheng Yuan ◽  
D.Y. Qiao
Keyword(s):  
Finite Element ◽  
Thermal Expansion ◽  
Finite Element Simulation ◽  
Thermal Loading ◽  
Coefficient Of Thermal Expansion ◽  
Element Simulation ◽  
Simulation Results ◽  
Structural Bifurcation

Bifurcation of multi-layer microstructures subjected to thermal loading can be harmful for reliability and stability of MEMS structures. In this paper, three imperfections of geometry, coefficient of thermal expansion and thermal loading were introduced to investigate their effects on structural bifurcation by finite element simulation. Results show that bifurcation is strongly influenced by the imperfections. With larger deviation of imperfections, it results in a decreasing temperature to trigger the bifurcation and a gradual beginning of it.

scholarly journals Simulation of an Adaptive Fluid-Membrane Piezoelectric Lens

2019 ◽  
Author(s):  
Hitesh Gowda Bettaswamy Gowda ◽  
Ulrike Wallrabe
Keyword(s):  
Fluid Dynamics ◽  
Finite Element ◽  
Thermal Expansion ◽  
Finite Element Simulation ◽  
Piezoelectric Effect ◽  
Experimental Results ◽  
Comsol Multiphysics ◽  
Fluid Forces ◽  
Element Simulation ◽  
Fluid Membrane

In this paper, we present a finite element simulation of an adaptive piezoelectric fluid-membrane lens modeled in COMSOL Multiphysics. The simulation couples the piezoelectric effect with the fluid dynamics to model the interaction between piezoelectric forces and fluid forces. Also, the simulation is extended to model the thermal expansion of the fluid. Finally, we compare the simulation and experimental results of the adaptive lens refractive power at different actuation levels and temperatures.

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