Comments, on "Finite-element analysis of waveguide modes: a novel approach that eliminates spurious modes" [with reply]

1991 ◽  
Vol 39 (3) ◽  
pp. 611 ◽  
Author(s):  
M. Mrozowski ◽  
T. Angkaew ◽  
M. Matsuhara ◽  
N. Kumagai
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Waveguide Modes ◽  
Novel Approach ◽  
Spurious Modes

Design of a Parametrically Excited Tuning Fork Microgyroscope

2005 ◽  
Author(s):  
Yongsik Lee ◽  
Z. C. Feng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Analysis ◽  
Nonlinear Analysis ◽  
Tuning Fork ◽  
Simplified Model ◽  
Structure Parameters ◽  
Element Analysis ◽  
Parametrically Excited ◽  
Novel Approach

Parametrically excited tuning fork micro gyroscopes have several attractive features. Most of all, the excitation may be externalized, which could simplify the design and fabrication of micro gyroscopes. However, there are no readily applicable tools to guide the design of these gyroscopes since the gyro structures are more complex than those structures whose responses to parametric excitations are known and since finite element analysis tools are not capable of studying parametric excitations. In this work, we adopt a novel approach to obtain a simplified model of the parametrically excited structure. Parameters in the simplified model are obtained using dynamic analysis capability of typical finite element programs and static nonlinear analysis capabilities.

Finite Element Analysis of Origami-Based Sheet Metal Folding Process

2018 ◽  
Vol 140 (3) ◽  
Author(s):  
Muhammad Ali Ablat ◽  
Ala Qattawi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Sheet Metal ◽  
High Stress ◽  
Element Analysis ◽  
Bending Force ◽  
Novel Approach ◽  
Cost Allocations ◽  
Metal Type ◽  
Material Discontinuities

Origami-based sheet metal (OSM) folding is a novel approach regarded as extension of the origami technique to sheet metal. It requires creating numerous features along the bend line, called material discontinuities (MD). Material discontinuities control the material deformation and result in reduced bending force (BF), minimal tooling, and machinery requirements. Despite the promising potential of OSM, there is little understating of the effect of the selected MD shape and geometry on the final workpiece. Specifically, this is of interest when comparing the manufacturing energy and cost allocations for OSM with a well-establish process for sheet metal such as stamping. In this work, wiping die bending of aluminum sheet with different MD shapes and geometries along the bend line is investigated using finite element analysis (FEA) and compared to traditional sheet bending in terms of stress distribution along the bending line, required bending force and springback. The FEA results are validated by comparing it to the available empirical models in terms of bending forces. This study found that OSM technique reduced the required bending force significantly, which has important significance in energy and cost reduction. The study also found each MD resulted with different bending force and localized stress. Hence, MD are ranked in terms of the required force to bend the same sheet metal type and thickness for further future investigation. Springback is decreased due to application of MD. Meanwhile, MD generated localized high stress regions along the bending line, which may affect load-bearing capability of the final part.

Self-adaptive fast frequency sweep for the finite element analysis of waveguide modes

Radio Science ◽  
2011 ◽  
Vol 46 (5) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. Schultschik ◽  
O. Farle ◽  
Y. Konkel ◽  
R. Dyczij-Edlinger
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Frequency Sweep ◽  
Waveguide Modes ◽  
The Finite Element Analysis ◽  
Self Adaptive

Generating Medial Axis by Local Adaptation For Polygons

2006 ◽  
Author(s):  
Yusheng Liu ◽  
Jie Yu ◽  
Shuming Gao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Local Adaptation ◽  
Medial Axis ◽  
Element Analysis ◽  
Reduced Representation ◽  
3D Objects ◽  
Novel Approach

Medial axis(MA) is a dimension-reduced representation for 2D/3D objects and widely used in finite element analysis(FEA). However it is very time consuming to computing MA from the scratch. In this study, a novel approach to generating the exact MA with local adaptation is proposed for polygons. The region where MA is to be changed is found out first. And then MA of the region is calculated and further it is combined with the unchanged MA to obtain the final MA for the whole part. The algorithm is implemented with ACIS 6.0 and some examples are given.

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