A vector finite-element analysis of complex modes in shielded microstrip lines

1993 ◽  
Vol 6 (16) ◽  
pp. 873-875 ◽  
Author(s):  
Md. Shah Alam ◽  
Koichi Hirayama ◽  
Yoshio Hayashi ◽  
Masanori Koshiba
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Microstrip Lines ◽  
Complex Modes ◽  
Vector Finite Element

Identification of a Significantly Non-Proportionally Damped Structure Using Force Appropriation

1995 ◽  
Author(s):  
P. S. Holmes ◽  
J. R. Wright ◽  
J. E. Cooper
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Normal Mode ◽  
Normal Modes ◽  
Dynamic Tests ◽  
High Quality ◽  
Element Analysis ◽  
Standard Curve ◽  
Complex Modes ◽  
Phase Resonance

Abstract Dynamic tests were carried out on an aluminium plate with significant non-proportional damping applied via two oil filled dampers. Normal mode force appropriation (phase resonance) methods were used to measure the undamped normal modes of the plate and the results compared with corresponding complex modes obtained using a standard curve fitting (phase separation) approach. It is demonstrated that, as long as suitable excitation positions are chosen, high quality undamped normal modes can be identified while the curve fitted modes are highly complex. A Finite Element analysis of the plate was used to show how the results of normal mode force appropriation are directly comparable, particularly when damping is non-proportional.

Spurious solutions in the finite-element analysis of microstrip lines

1978 ◽  
Vol 98 (4) ◽  
pp. 8-15 ◽  
Author(s):  
Masatoshi Ikeuchi ◽  
Kazuo Inoue ◽  
Hideo Sawami ◽  
Hiroshi Niki
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Microstrip Lines ◽  
Spurious Solutions ◽  
The Finite Element Analysis
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