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김현기(Hyungi Kim),조맹효(Maenghyo Cho) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.3
The adjoint variable method can reduce computation time and save computer resources because it can selectively provide the sensitivity information for the positions that designers wish to measure. However, the adjoint variable method commonly employs exact analytical differentiation with respect to the design variables. It can be cumbersome to precisely differentiate every given type of finite element. This trouble can be overcome only if the numerical differentiation scheme can replace this exact manner of differentiation. But, the numerical differentiation scheme causes of severe inaccuracy due to the perturbation size dilemma. For assuring the accurate sensitivity without any dependency of perturbation size, this paper employs a complex variable that has been mainly used for computational fluid dynamics problems. The adjoint variable method combined with complex variables is applied to obtain the shape and size sensitivity for structural optimization. Numerical examples demonstrate that the proposed method can predict stable sensitivity results and that its accuracy is remarkably superior to traditional sensitivity evaluation methods.
김현기(Hyungi Kim),명노해(Rohae Myung) 대한인간공학회 2017 大韓人間工學會誌 Vol.36 No.6
Objective: The aim of this study is to analyze the work domain and to extract the information requirements based on work domain analysis for ecological interface design of search and rescue helicopter. Background: Due to Flight at low altitude and many take-off and landings, helicopter’s maneuvering have a high probability of human errors. In particular, search and rescue mission requires an effective interface because of helicopter’s flight in urgent and risky environments. To cope with unanticipated events in the helicopter’s maneuvering environment, work domain analysis has been used to introduce an effective design method, ecological interface design. Method: With the pilot operating on the search and rescue helicopter, (1) Work domain model was created by performing work domain analysis through abstraction hierarchy and part-whole hierarchy of search and rescue helicopter, (2) then the scenario mapping test was performed to evaluate the work domain model. Results: The Information requirements for ecological interface design of search and rescue helicopter was extracted in work domain model. Conclusion: In this study, the constraints and information requirements in the search and rescue helicopter were obtained through the work domain analysis of search and rescue helicopter, and it expand to the area of ecological interface design for helicopter. Application: The results of this study can improve the interface of search and rescue helicopter currently in use and help to ensure safe flight.