Combined finite element-normal mode expansion methods in electroelasticity and their application to piezoactive motors

1997 ◽  
Vol 40 (18) ◽  
pp. 3385-3403 ◽  
Author(s):  
R. Le Letty ◽  
F. Claeyssen ◽  
N. Lhermet ◽  
B. Hamonic ◽  
J. N. Decarpigny ◽  
...  
Keyword(s):  
Finite Element ◽  
Normal Mode ◽  
Mode Expansion

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.

scholarly journals Quasi-normal mode expansion as a tool for the design of nanophotonic devices

2020 ◽  
Vol 238 ◽  
pp. 05008
Author(s):  
Rémi Colom ◽  
Felix Binkowski ◽  
Fridtjof Betz ◽  
Martin Hammerschmidt ◽  
Lin Zschiedrich ◽  
...  
Keyword(s):  
Normal Mode ◽  
Optical Antennas ◽  
Far Field ◽  
Riesz Projection ◽  
Mode Expansion ◽  
Nanophotonic Devices ◽  
Matter Interaction ◽  
Quasi Normal Mode ◽  
Light Matter Interaction

Many nanophotonic devices rely on the excitation of photonic resonances to enhance light-matter interaction. The understanding of the resonances is therefore of a key importance to facilitate the design of such devices. These resonances may be analyzed by use of the quasi-normal mode (QNM) theory. Here, we illustrate how QNM analysis may help study and design resonant nanophotonic devices. We will in particular use the QNM expansion of far-field quantities based on Riesz projection to design optical antennas.

Sign in / Sign up

Export Citation Format

Share Document