Seokmin Choi - Academia.edu (original) (raw)
Uploads
Papers by Seokmin Choi
13th AIAA/ISSMO Multidisciplinary Analysis Optimization Conference, 2010
To improve design results while avoiding expensive computational cost, an advanced variable compl... more To improve design results while avoiding expensive computational cost, an advanced variable complexity modeling (AVCM) framework is studied and presented. AVCM is introduced by using Neural Network as a scaling method to low-fidelity model in the optimization loop in which trust region management strategy is implemented to ensure the matching of low-fidelity models to high-fidelity results. The logical and systematical approach for aircraft design synthesis program-ADSP is developed and validated by three regional jet aircrafts. Then, AVCM is integrated successfully under ADSP in multidisciplinary RJA design optimization to improve the accuracy of design method without any noticeable increase in design turnaround time Minimization of Take-off Gross Weight-TOGW is performed and the design result shows the feasibility and effectiveness of the present AVCM framework under MDO problem.
10th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference, 2010
In this paper, aircraft design is explained as a Multidisciplinary Design Optimization (MDO) whic... more In this paper, aircraft design is explained as a Multidisciplinary Design Optimization (MDO) which incorporates airworthiness requirements. In a preliminary sizing phase, preliminary aircraft configurations are defined from a user-requirements analysis and conventional conceptual design process. Conceptual design and analysis modules are developed and integrated into a multidisciplinary optimization to improve the aircraft conceptual design process. Multidisciplinary feasibility (MDF) is established by implementing a multidisciplinary analysis which couples a preliminary sizing module with a conceptual design and analysis module. During an aircraft application certification phase, design constraints are established by a Design-Certification Related Table (DCRT) and selected by investigating aircraft safety requirements including Korea Airworthiness Standards (KAS) and Federal Aviation Regulations (FAR). By carefully selecting design variables, a multidisciplinary design optimization is performed. The case study is general aviation aircraft design to demonstrate the feasibility and effectiveness of rapid aircraft conceptual design. Minimization of takeoff gross weight of general aviation aircraft is performed and the design result shows the feasibility and effectiveness of the aircraft conceptual design process.
Aerospace Science and Technology, 2013
This paper describes the Multidisciplinary Design Optimization (MDO) of Unmanned Combat Air Vehic... more This paper describes the Multidisciplinary Design Optimization (MDO) of Unmanned Combat Air Vehicle (UCAV) using Multi-Fidelity Model (MFM). Multidisciplinary feasible approach is implemented to decompose a coupling variable in a mission and a weight analysis module effectively. The necessary low-fidelity codes, which are based on empirical equations, are developed and validated for aircraft conceptual design. Meanwhile, the strategy of MFM, which constructs accurate and reliable meta-models by using the high-fidelity analysis, is implemented to improve the accuracy of the design method for UCAVs without any noticeable increase in design turnaround time. Minimization of multi-objective design optimization which consists of range and weight is performed and the design result shows the feasibility and effectiveness of the present multi-fidelity technique under MDO problem.
13th AIAA/ISSMO Multidisciplinary Analysis Optimization Conference, 2010
To improve design results while avoiding expensive computational cost, an advanced variable compl... more To improve design results while avoiding expensive computational cost, an advanced variable complexity modeling (AVCM) framework is studied and presented. AVCM is introduced by using Neural Network as a scaling method to low-fidelity model in the optimization loop in which trust region management strategy is implemented to ensure the matching of low-fidelity models to high-fidelity results. The logical and systematical approach for aircraft design synthesis program-ADSP is developed and validated by three regional jet aircrafts. Then, AVCM is integrated successfully under ADSP in multidisciplinary RJA design optimization to improve the accuracy of design method without any noticeable increase in design turnaround time Minimization of Take-off Gross Weight-TOGW is performed and the design result shows the feasibility and effectiveness of the present AVCM framework under MDO problem.
10th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference, 2010
In this paper, aircraft design is explained as a Multidisciplinary Design Optimization (MDO) whic... more In this paper, aircraft design is explained as a Multidisciplinary Design Optimization (MDO) which incorporates airworthiness requirements. In a preliminary sizing phase, preliminary aircraft configurations are defined from a user-requirements analysis and conventional conceptual design process. Conceptual design and analysis modules are developed and integrated into a multidisciplinary optimization to improve the aircraft conceptual design process. Multidisciplinary feasibility (MDF) is established by implementing a multidisciplinary analysis which couples a preliminary sizing module with a conceptual design and analysis module. During an aircraft application certification phase, design constraints are established by a Design-Certification Related Table (DCRT) and selected by investigating aircraft safety requirements including Korea Airworthiness Standards (KAS) and Federal Aviation Regulations (FAR). By carefully selecting design variables, a multidisciplinary design optimization is performed. The case study is general aviation aircraft design to demonstrate the feasibility and effectiveness of rapid aircraft conceptual design. Minimization of takeoff gross weight of general aviation aircraft is performed and the design result shows the feasibility and effectiveness of the aircraft conceptual design process.
Aerospace Science and Technology, 2013
This paper describes the Multidisciplinary Design Optimization (MDO) of Unmanned Combat Air Vehic... more This paper describes the Multidisciplinary Design Optimization (MDO) of Unmanned Combat Air Vehicle (UCAV) using Multi-Fidelity Model (MFM). Multidisciplinary feasible approach is implemented to decompose a coupling variable in a mission and a weight analysis module effectively. The necessary low-fidelity codes, which are based on empirical equations, are developed and validated for aircraft conceptual design. Meanwhile, the strategy of MFM, which constructs accurate and reliable meta-models by using the high-fidelity analysis, is implemented to improve the accuracy of the design method for UCAVs without any noticeable increase in design turnaround time. Minimization of multi-objective design optimization which consists of range and weight is performed and the design result shows the feasibility and effectiveness of the present multi-fidelity technique under MDO problem.