3204 Development of Global Optimization Method by Orthogonal Array Application to Multi-Objective Optimization Problem

2006 ◽  
Vol 2006.16 (0) ◽  
pp. 299-300
Author(s):  
Hiroyuki KAWAGISHI
Keyword(s):  
Global Optimization ◽  
Orthogonal Array ◽  
Optimization Problem ◽  
Optimization Method ◽  
Multi Objective Optimization ◽  
Global Optimization Method ◽  
Multi Objective

Synthesis of Controllers for MIMO Systems with Time Response Specifications

2014 ◽  
Vol 3 (3) ◽  
pp. 25-52 ◽  
Author(s):  
Maher Ben Hariz ◽  
Wassila Chagra ◽  
Faouzi Bouani
Keyword(s):  
Global Optimization ◽  
Optimization Problem ◽  
Closed Loop ◽  
Controller Design ◽  
Mimo Systems ◽  
Optimal Solution ◽  
Optimization Method ◽  
Time Response ◽  
Step Response ◽  
Global Optimization Method

This paper proposes the design of fixed low order controllers for Multi Input Multi Output (MIMO) decoupled systems. The simplified decoupling is used as a decoupling system technique due to its advantages compared to other decoupling methods. The main objective of the proposed controllers is to satisfy some desired closed loop step response performances such as the settling time and the overshoot. The controller design is formulated as an optimization problem which is non convex and it takes in account the desired closed loop performances. Therefore, classical methods used to solve the non convex optimization problem can generate a local solution and the resulting control law is not optimal. Thus, the thought is to use a global optimization method in order to obtain an optimal solution which will guarantee the desired time response specifications. In this work the Generalized Geometric Programming (GGP) is exploited as a global optimization method. The key idea of this method consists in transforming an optimization problem, initially, non convex to a convex one by some mathematical transformations. Simulation results and a comparison study between the presented approach and a Proportional Integral (PI) controller are given in order to shed light the efficiency of the proposed controllers.

2105 Development of Global Optimization Method by Orthogonal Array Application to Turbine Stage Design

2005 ◽  
Vol 2005.15 (0) ◽  
pp. 259-262
Author(s):  
Hiroyuki KAWAGISHI ◽  
Kazuhiko KUDO ◽  
Hisashi MATSUDA ◽  
Fumio OOTOMO ◽  
Asako INOMATA
Keyword(s):  
Global Optimization ◽  
Orthogonal Array ◽  
Optimization Method ◽  
Global Optimization Method ◽  
Turbine Stage ◽  
Stage Design

scholarly journals Multi-objective Optimization of Compliant Parallel Platform for Desired Stiffness and Workspace

2021 ◽  
Author(s):  
Hongwei Xu ◽  
Haibo Zhou ◽  
Zhiqiang Li ◽  
Xia Ju
Keyword(s):  
Numerical Model ◽  
Optimization Problem ◽  
Structural Parameters ◽  
Optimization Method ◽  
Multi Objective Optimization ◽  
Element Analysis ◽  
Multi Objective ◽  
Performance Indexes ◽  
Parallel Platform ◽  
The Relationship

Abstract Stiffness and workspace are crucial performance indexes of a precision mechanism. In this paper, an optimization method is presented, for a compliant parallel platform to achieve desired stiffness and workspace. First, a numerical model is proposed to reveal the relationship between structural parameters, desired stiffness and workspace of the compliant parallel platform. Then, the influence of the various parameters on stiffness and workspace of the platform is analyzed. Based on Gaussian distribution, the multi-objective optimization problem is transformed into a single-objective one, in order to guarantee convergence precision. Furthermore, particle swarm optimization is used to optimize the structural parameters of the platform, which significantly improve its stiffness and workspace. Last, the effectiveness of the proposed numerical model is verified by finite element analysis and experiment.

Increasing Output in Transfer Lines through Adaptive Buffer Operation

2016 ◽  
Author(s):  
Jeanette Hamiga
Keyword(s):  
Production System ◽  
Optimization Problem ◽  
Optimization Method ◽  
Multi Objective Optimization ◽  
Labor Costs ◽  
Serial Transfer ◽  
Transfer Lines ◽  
Multi Objective ◽  
Simulation Based ◽  
Decoupling Effect

This thesis is intended for engineers and scientists in the field of production. It deals with the goal of increasing output in (serial) transfer lines and simultaneously decreasing labor costs without need of change to the structure of the production system. For this the method adaptive buffer operation is developed, implemented and validated. Adaptive buffer operation proposes a different way of operating buffers, improving the decoupling effect of buffers. The buffers are filled to certain target fill levels at fixed moments (times of the day). Apart from the target fill levels further parameters, e.g. moments of intervention or the intervention frequency, are identified. To find out how to operate the buffers and which parameter combinations work best, a simulation-based optimization method is proposed. This method is split into the evaluative ­methodology, here simulation, and the generative technique of evolution strategies, solving the multi-objective optimization problem. Proo...

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