Topology gradient optimization in 2-D and 3-D for the design of microwave components

2008 ◽  
Vol 50 (10) ◽  
pp. 2739-2743 ◽  
Author(s):  
Hassan Khalil ◽  
Atousa Assadihaghi ◽  
Stéphane Bila ◽  
Dominique Baillargeat ◽  
M. Aubourg ◽  
...  
Keyword(s):  
Gradient Optimization ◽  
Microwave Components

Design of Microwave Components using Topology Gradient Optimization

2006 ◽  
Author(s):  
A. Assadihaghi ◽  
S. Bila ◽  
C. Durousseau ◽  
D. Baillargeat ◽  
M. Aubourg ◽  
...  
Keyword(s):  
Gradient Optimization ◽  
Microwave Components

scholarly journals Determination of synchronous generator nonlinear model parameters based on power rejection tests using a gradient optimization algorithm

2017 ◽  
Vol 65 (4) ◽  
pp. 479-488 ◽  
Author(s):  
A. Boboń ◽  
A. Nocoń ◽  
S. Paszek ◽  
P. Pruski
Keyword(s):  
Parameter Estimation ◽  
Objective Function ◽  
Optimization Algorithm ◽  
Least Squares Method ◽  
Synchronous Generator ◽  
Operating Conditions ◽  
Model Parameters ◽  
State Variables ◽  
Starting Point ◽  
Gradient Optimization

AbstractThe paper presents a method for determining electromagnetic parameters of different synchronous generator models based on dynamic waveforms measured at power rejection. Such a test can be performed safely under normal operating conditions of a generator working in a power plant. A generator model was investigated, expressed by reactances and time constants of steady, transient, and subtransient state in the d and q axes, as well as the circuit models (type (3,3) and (2,2)) expressed by resistances and inductances of stator, excitation, and equivalent rotor damping circuits windings. All these models approximately take into account the influence of magnetic core saturation. The least squares method was used for parameter estimation. There was minimized the objective function defined as the mean square error between the measured waveforms and the waveforms calculated based on the mathematical models. A method of determining the initial values of those state variables which also depend on the searched parameters is presented. To minimize the objective function, a gradient optimization algorithm finding local minima for a selected starting point was used. To get closer to the global minimum, calculations were repeated many times, taking into account the inequality constraints for the searched parameters. The paper presents the parameter estimation results and a comparison of the waveforms measured and calculated based on the final parameters for 200 MW and 50 MW turbogenerators.

Image captioning via hierarchical attention mechanism and policy gradient optimization

2020 ◽  
Vol 167 ◽  
pp. 107329 ◽  
Author(s):  
Shiyang Yan ◽  
Yuan Xie ◽  
Fangyu Wu ◽  
Jeremy S. Smith ◽  
Wenjin Lu ◽  
...  
Keyword(s):  
Attention Mechanism ◽  
Image Captioning ◽  
Gradient Optimization ◽  
Policy Gradient

Cylindrical radial superlattice conductors for low loss microwave components

2015 ◽  
Vol 117 (10) ◽  
pp. 103911 ◽  
Author(s):  
Arian Rahimi ◽  
Jiyu Wu ◽  
Xiaoyu Cheng ◽  
Yong-Kyu ‘YK’ Yoon
Keyword(s):  
Low Loss ◽  
Microwave Components

Multi-function microwave components based on implantable filters

2016 ◽  
Vol 23 (1) ◽  
pp. 34-51 ◽  
Author(s):  
Xiu Yin Zhang ◽  
Kai Xu Wang ◽  
Yuan Chun Li ◽  
Li Gao ◽  
Xiao Feng Liu
Keyword(s):  
Microwave Components

Amorphous Fluoropolymer Films for Superconductive Microwave Components Using High-TcSuperconducting Films

1991 ◽  
Vol 30 (Part 1, No. 11A) ◽  
pp. 2751-2755 ◽  
Author(s):  
Yasuhiro Nagai ◽  
Naobumi Suzuki ◽  
Makoto Sato ◽  
Tsuneo Konaka
Keyword(s):  
Microwave Components ◽  
Fluoropolymer Films
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