Transonic Aeroelastic Computations on Wings using Navier Stokes Equations, (9999)
Guruswamy, Guru P., Obayashi, Shigeru
Aeroelastic computations are made on fighter-type wings in the transonic regime. The flow is modeled using the Navier-Stokes equations and is coupled with structural equations of motion. The flow...
Shigeru Obayashi, Shinichi Takahashi, Ian Fejtek
An inverse optimization method coupled with a multiobjective Genetic Algorithm has been applied to design a transonic wing for mid-size regional aircraft. Optimization of target pressure...
Aerodynamic Optimization of Transonic Wing Design Based on Evolutionary Algorithm (2008)
Akira Oyama, Shigeru Obayashi, Kazuhiro Nakahashi, Takashi Nakamura
ABSTRACT: Evolutionary Algorithm (EA) is applied to a practical three-dimensional shape optimization for aerodynamic design of an aircraft wing. Aerodynamic performances of the design candidates are...
AEODYNAMIC OPTIMIZATION OF SUPERSONIC TRANSPORT WING USING UNSTRUCTURED ADJOINT METHOD (2008)
Hyoung-jin Kim, Daisuke Sasaki, Shigeru Obayashi
In the application of gradient-based methods to practical aerodynamic design problems, one of the major concerns is an accurate and e cient calculation of sensitivity derivatives of an aerodynamic...
Akira Oyama, Shigeru Obayashi, Kazuhiro Nakahashi, Naoki Hirose
Evolutionary Algorithms (EAs) based on structured coding have been proposed for aerodynamic optimization of wing design. Fractional factorial design is used to investigate interactions of the design...
Daisuke Sasaki, Masashi Morikawa, Shigeru Obayashi, Kazuhiro Nakahashi
Abstract. This paper describes an application of Adaptive Range Multiobjective Genetic Algorithms (ARMOGAs) to aerodynamic wing optimization. The objectives are to minimize transonic and supersonic...
Rafal Kicinger, Tomasz Arciszewski, Shigeru Obayashi
The paper presents results of computational experiments in which the impact of design representations on the performance of an evolutionary multiobjective structural design processes was...
Visualization of Global Trade-offs in Aerodynamic Problems by ARMOGAs (2008)
Daisuke Sasaki, Shigeru Obayashi
Abstract. Global tradeoffs for aerodynamic design of Supersonic Transport (SST) have been investigated by Multi-Objective Evolutionary Algorithms (MOEAs). The objectives are to reduce both drag and...
Rafal Kicinger, Shigeru Obayashi, Tomasz Arciszewski
Abstract. This paper presents results of extensive computational experiments in which evolutionary multiobjective algorithms were used to find Pareto-optimal solutions to a complex structural design...
Kazuhisa Chiba, Shigeru Obayashi
Analysis of variance (ANOVA) and self-organizing map (SOM) were applied to data mining for aerodynamic design space. These methods make it possible to identify the effect of each design variable on...
Multidisciplinary Wing Design Optimization Using Multiobjective Evolutionary Algorithm (2007)
this paper, a MOEA will be applied to a multiobjective multidisciplinary optimization of a transonic wing design.
Abstract. Real-coded Adaptive Range Genetic Algorithms (ARGAs) have been applied to a practical three-dimensional shape optimization for aerodynamic design of an aircraft wing. The real-coded ARGAs...
Multi-Objective Design Exploration for Aerodynamic Configurations (2007)
Shigeru Obayashi, Shinkyu Jeong, Kazuhisa Chiba
A new approach, Multi-Objective Design Exploration (MODE), is presented to address Multidisciplinary Design Optimization problems. MODE reveals the structure of the design space from the trade-off...
Efficient search for trade-offs by adaptive range multi-objective genetic algorithms (2005)
Sasaki, Daisuke, Obayashi, Shigeru
Trade-offs is one of important elements for engineering design problems characterized by multiple conflicting objectives that needs to be simultaneously improved. Further, in many problems such as...
Visualization of Global Trade-Offs in Aerodynamic Problems by ARMOGAs (2005)
Sasaki, Daisuke, Obayashi, Shigeru
Trade-offs is one of important elements for engineering design problems characterized by multiple conflicting design objectives to be simultaneously improved. In many design problems such as...
Shinkyu Jeong, Kazuomi Yamamoto, Shigeru Obayashi
In this paper, Kriging model is applied to a constrained multi-objective optimization problem. In order to balance the local and global search in the Kriging model, the criterion ‘expected...
2003, Visualization and data mining of Pareto solutions using self-organizing map (2003)
Shigeru Obayashi, Daisuke Sasaki
Abstract. Self-Organizing Maps (SOMs) have been used to visualize tradeoffs of Pareto solutions in the objective function space for engineering design obtained by Evolutionary Computation....
High-Fidelity Swept and Leaned Rotor Blade Design Optimization Using Evolutionary Algorithm (2003)
Akira Oyama, Meng-Sing Liou, Shigeru Obayashi
In this paper, aerodynamic blade design optimization for a transonic axial compressor has demonstrated by using an evolutionary-algorithm-based high-fidelity design optimization tool. The present...
Masahiro Kanazaki, Masashi Morikawa, Shigeru Obayashi
Abstract. Multiobjective design optimization system of exhaust manifold shapes for a car engine has been developed using Divided Range Multiobjective Genetic Algorithm (DRMOGA) to obtain more engine...
Transonic Axial-Flow Blade Shape Optimization Using Evolutionary Algorithm and (2002)
A reliable and efficient aerodynamic design optimization tool using evolutionary algorithm has been developed for transonic compressor blades. A real-coded adaptive-range genetic algorithm is used to...
Masahiro Kanazaki, Masashi Morikawa, Shigeru Obayashi
Abstract. Multiobjective design optimization system of exhaust manifold shapes for a car engine has been developed using Divided Range Multiobjective Genetic Algorithm (DRMOGA) to obtain more engine...
Real-coded adaptive range genetic algorithm applied to transonic wing optimization (2001)
Akira Oyama, Shigeru Obayashi, Takashi Nakamura
applied to a practical three-dimensional shape optimization for aerodynamic design of an aircraft wing. The real-coded ARGAs possess both advantages of the binary-coded ARGAs and the floating-point...
Real-coded adaptive range genetic algorithm applied to transonic wing optimization (2001)
Akira Oyama, Shigeru Obayashi, Takashi Nakamura
applied to a practical three-dimensional shape optimization for aerodynamic design of an aircraft wing. The real-coded ARGAs possess both advantages of the binary-coded ARGAs and the floating-point...
Real-coded adaptive range genetic algorithm applied to transonic wing optimization (2001)
Akira Oyama, Shigeru Obayashi, Kazuhiro Nakahashi
Real-coded Adaptive Range Genetic Algorithms (ARGAs) have been developed. The real-coded ARGAs possess both advantages of the binary-coded ARGAs and the use of the floating point representation to...
Multiobjective Evolutionary Computation for Supersonic Wing-Shape Optimization (2000)
Shigeru Obayashi, Daisuke Sasaki
To respond future increase of air traffic demand,
Multiobjective Evolutionary Computation for Supersonic Wing-Shape Optimization (2000)
Shigeru Obayashi, Daisuke Sasaki, Yukihiro Takeguchi, Naoki Hirose
Abstract—This paper discusses the design optimization of a wing for supersonic transport (SST) using a multiple-objective genetic algorithm (MOGA). Three objective functions are used to minimize...
Design optimization of supersonic wings using evolutionary algorithms (1998)
Shigeru Obayashi, Kazuhiro Nakahashi, Akira Oyama, Nobuhisa Yoshino
Abstract. Feasibility of evolutionary computations for supersonic wing design optimization was demonstrated by the single-objective aerodynamic optimization and multiobjective, multidisciplinary...