Conceptual Design of a Multi-Rotor Unmanned Aerial Vehicle based on an Axiomatic Design

Yoo, Dong-Wan,Won, Dae-Yeon,Tahk, Min-Jea The Korean Society for Aeronautical and Space Scie 2010 International Journal of Aeronautical and Space Sc Vol.11 No.2

This paper presents the conceptual design of a multi-rotor unmanned aerial vehicle (UAV) based on an axiomatic design. In most aerial vehicle design approaches, design configurations are affected by past and current design tendencies as well as an engineer's preferences. In order to design a systematic design framework and provide fruitful design configurations for a new type of rotorcraft, the axiomatic design theory is applied to the conceptual design process. Axiomatic design is a design methodology of a system that uses two design axioms by applying matrix methods to systematically analyze the transformation of customer needs into functional requirements (FRs), design parameters (DPs), and process variables. This paper deals with two conceptual rotary wing UAV designs, and the evaluations of tri-rotor and quad-rotor UAVs with proposed axiomatic approach. In this design methodology, design configurations are mainly affected by the selection of FRs, constraints, and DPs.

Conceptual Design of a Multi-Rotor Unmanned Aerial Vehicle based on an Axiomatic Design

Dong-Wan Yoo,Dae-Yeon Won,Min-Jea Tahk 한국항공우주학회 2010 International Journal of Aeronautical and Space Sc Vol.11 No.2

This paper presents the conceptual design of a multi-rotor unmanned aerial vehicle (UAV) based on an axiomatic design. In most aerial vehicle design approaches, design configurations are affected by past and current design tendencies as well as an engineer’s preferences. In order to design a systematic design framework and provide fruitful design configurations for a new type of rotorcraft, the axiomatic design theory is applied to the conceptual design process. Axiomatic design is a design methodology of a system that uses two design axioms by applying matrix methods to systematically analyze the transformation of customer needs into functional requirements (FRs), design parameters (DPs), and process variables. This paper deals with two conceptual rotary wing UAV designs, and the evaluations of tri-rotor and quad-rotor UAVs with proposed axiomatic approach. In this design methodology, design configurations are mainly affected by the selection of FRs, constraints, and DPs.

Uncertainty-based MDO for aircraft conceptual design

Park, Hyeong-Uk,Lee, Jae-Woo,Chung, Joon,Behdinan, Kamran Emerald Group Publishing Limited 2015 Aircraft engineering and aerospace technology Vol.87 No.4

<P><B>Purpose</B></P> <P> – The purpose of this paper is to study the consideration of uncertainty from analysis modules for aircraft conceptual design by implementing uncertainty-based design optimization methods. Reliability-Based Design Optimization (RBDO), Possibility-Based Design Optimization (PBDO) and Robust Design Optimization (RDO) methods were developed to handle uncertainties of design optimization. The RBDO method is found suitable for uncertain parameters when sufficient information is available. On the other hand, the PBDO method is proposed when uncertain parameters have insufficient information. The RDO method can apply to both cases. The RBDO, PBDO and RDO methods were considered with the Multidisciplinary Design Optimization (MDO) method to generate conservative design results when low fidelity analysis tools are used. </P> <P><B>Design/methodology/approach</B></P> <P> – Methods combining MDO with RBDO, PBDO and RDO were developed and have been applied to a numerical analysis and an aircraft conceptual design. This research evaluates and compares the characteristics of each method in both cases. </P> <P><B>Findings</B></P> <P> – The RBDO result can be improved when the amount of data concerning uncertain parameters is increased. Conversely, increasing information regarding uncertain parameters does not improve the PBDO result. The PBDO provides a conservative result when less information about uncertain parameters is available. </P> <P><B>Research limitations/implications</B></P> <P> – The formulation of RDO is more complex than other methods. If the uncertainty information is increased in aircraft conceptual design case, the accuracy of RBDO will be enhanced. </P> <P><B>Practical implications</B></P> <P> – This research increases the probability of a feasible design when it considers the uncertainty. This result gives more practical optimization results on a conceptual design level for fabrication. </P> <P><B>Originality/value</B></P> <P> – It is RBDO, PBDO and RDO methods combined with MDO that satisfy the target probability when the uncertainties of low fidelity analysis models are considered.</P>

Status of the Astrid Core at the end of the Pre-Conceptual Design Phase 1

MS. CHENAUD,N. Devictor,G. Mignot,F. Varaine,C. Venard,L. Martin,M. Phelip,D. Lorenzo,F. Serre,F. Bertrand,N. Alpy,M. Le Flem,P. Gavoille,R. Lavastre,P. Richard,D. Verrier,D.Schmitt 한국원자력학회 2013 Nuclear Engineering and Technology Vol.45 No.6

Within the framework of the ASTRID project, core design studies are being conducted by the CEA with support from AREVA and EDF. The pre-conceptual design studies are being conducted in accordance with the GEN IV reactor objectives, particularly in terms of improving safety. This involves limiting the consequences of 1) a hypothetical control rod withdrawal accident (by minimizing the core reactivity loss during the irradiation cycle), and 2) an hypothetical loss-of-flow accident (by reducing the sodium void worth). Two types of cores are being studied for the ASTRID project. The first is based on a ‘large pin/small spacing wire’ concept derived from the SFR V2b, while the other is based on an innovative CFV design. A distinctive feature of the CFV core is its negative sodium void worth. In 2011, the evaluation of a preliminary version (v1) of this CFV core for ASTRID underlined its potential capacity to improve the prevention of severe accidents. An improved version of the ASTRID CFV core (v2) was proposed in 2012 to comply with all the control rod withdrawal criteria, while increasing safety margins for all unprotected-loss-of-flow (ULOF) transients and improving the general design. This paper describes the CFV v2 design options and reports on the progress of the studies at the end of pre-conceptual design phase 1 concerning: - Core performance, - Intrinsic behavior during unprotected transients, - Simulation of severe accident scenarios, - Qualification requirements. The paper also specifies the open options for the materials, sub-assemblies, absorbers, and core monitoring that will continue to be studied during the conceptual design phase. Within the framework of the ASTRID project, core design studies are being conducted by the CEA with support fromAREVA and EDF. The pre-conceptual design studies are being conducted in accordance with the GEN IV reactor objectives,particularly in terms of improving safety. This involves limiting the consequences of 1) a hypothetical control rod withdrawalaccident (by minimizing the core reactivity loss during the irradiation cycle), and 2) an hypothetical loss-of-flow accident (byreducing the sodium void worth). Two types of cores are being studied for the ASTRID project. The first is based on a ‘large pin/small spacing wire’concept derived from the SFR V2b, while the other is based on an innovative CFV design. A distinctive feature of the CFVcore is its negative sodium void worth. In 2011, the evaluation of a preliminary version (v1) of this CFV core for ASTRID underlined its potential capacity toimprove the prevention of severe accidents. An improved version of the ASTRID CFV core (v2) was proposed in 2012 to comply with all the control rod withdrawalcriteria, while increasing safety margins for all unprotected-loss-of-flow (ULOF) transients and improving the general design. This paper describes the CFV v2 design options and reports on the progress of the studies at the end of pre-conceptualdesign phase 1 concerning:- Core performance,- Intrinsic behavior during unprotected transients,- Simulation of severe accident scenarios,- Qualification requirements. The paper also specifies the open options for the materials, sub-assemblies, absorbers, and core monitoring that willcontinue to be studied during the conceptual design phase.

모바일 탐구학습을 위한 수업설계의 개념모형 개발 연구: 테크놀로지 통합을 중심으로

김성욱 ( Sungwook Kim ),임철일 ( Cheolil Lim ) 한국교육공학회 2017 교육공학연구 Vol.33 No.2

본 연구는 모바일 테크놀로지를 통해 발생하는 학습자의 독특한 학습경험을 바탕으로 초·중등교육 맥락에서 모바일 탐구학습을 효과적으로 설계하기 위한 수업설계의 개념모형을 개발하는 것을 목적으로 실행되었다. 특히, 테크놀로지 통합의 관점에서 모바일 탐구 학습을 위한 수업설계의 개념모형과 설계원리를 개발하고 이를 타당화하였다. 본 연구는 설계·개발 연구방법을 적용하였으며, 선행문헌 고찰을 통해 모형의 구성요소와 설계원리를 도출한 후 초기 개념모형을 개발하였다. 초기 모형의 타당화를 위해 전문가 검토와 사용성 평가를 실시하였고, 타당화 의견을 반영하여 모형을 지속적으로 개선하였다. 연구결과, 모바일 탐구학습을 위한 수업설계의 개념모형과 13개의 설계원리 및 34개의 상세지침이 개발되었다. 개념모형은 `교육과정`, `모바일 테크놀로지`, `맥락`, `정보자원`, `모바일 탐구과제`, `모바일 탐구학습 활동`의 6개의 구성요소로 이루어져 있으며 수업설계의 개념적 이해를 돕기 위해 각 구성요소들 간의 관계를 시각적으로 나타내고 있다. 또한 본 모형이 테크놀로지 통합 수업을 체계적으로 설계하는데 도움이 된다는 것을 확인하였다. 이상의 연구결과에 기초하여 본 연구의 이론적·실천적 함의를 모바일 학습과 탐구학습, 테크놀로지 통합 수업설계 측면에서 논의하였다. The purpose of this study is to develop a conceptual model of instructional design for helping enhance designing of mobile inquiry learning grounded on unique learning experience generated from using mobile technology in the context of primary and secondary education. Especially, from the perspective of technology integration, this research developed and validated the conceptual model and design principles of instructional design for mobile inquiry learning. Design and development research method was adopted in this study. The initial conceptual model was developed after deriving the components and design principles of the model through literature review. Expert`s review and usability test were conducted to validate the first version of designed model, and the initial model was continuously improved by reflecting the validation opinions. As a result, a conceptual model, 13 designing principles and 34 specific guidelines to design technology integration instruction for mobile inquiry learning were suggested. The conceptual model consists of 6 components; curriculum, mobile technologies, context, information resources, mobile inquiry task, and mobile inquiry learning activities. The conceptual model provides a visual representation of the relationships among the components in order to facilitate the conceptual understanding of instructional design. Also, it verified that this model is helpful to design technology integration instruction systematically. The theoretical and practical meaning of this research on mobile learning, inquiry learning, and designing technology integration instruction were described based on the result of validation.

Collaborative Optimization을 이용한 관측위성의 다분야 통합 설계 최적화

이흥섭,김홍래,장영근 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.11

본고에서는 다분야 통합 최적설계(MDO : Multidisciplinary Design Optimization)를 적용한 지구관측위성의 개념설계 결과를 기술하였다. 다분야 통합 최적설계 기법 중 CO(Collaborative Optimization) 기법을 적용하여 지구관측위성의 최적 개념설계를 수행할 수 있는 도구를 구성하였다. 최적화 알고리즘으로는 SQP(Sequential Quadratic Programming)를 이용하였으며, 주어진 제약조건을 만족시키면서 위성의 총 질량을 최소화하는 것을 설계 목표로 하였다. 최적 개념설계 도구를 이용하여 설계되어진 지구관측위성의 설계 결과를 통해 개발된 최적 개념설계 도구의 타당성을 검증하였다. In this research, MDO(Multidisciplinary Design Optimization) for the Conceptual Design of Earth Observation Satellite is performed. CO(Collaborative Optimization) method is selected as MDO architecture and Optimal Conceptual Design Tool for Earth Observation Satellite is constructed by this Method. SQP(Sequential Quadratic Programming) is implemented as an optimization algorithm. The design objective is to minimize the total satellite mass while satisfying all design constraints. The Optimal Conceptual Design Tool is verified by the result of EO Satellite conceptual design.

Design space exploration in aircraft conceptual design phase based on system-of-systems simulation

Tian Yifeng,Liu Hu,Huang Jun 한국항공우주학회 2015 International Journal of Aeronautical and Space Sc Vol.16 No.4

Design space exploration has been much neglected in aircraft conceptual design phase, which often leads to a waste of time and cost in design, manufacture and operation process. It is necessary to explore design space based on operational systemof-systems (SoS) simulation during the early phase for a competitive design. This paper proposes a methodology to analyze aircraft performance parameters in four steps: combination of parameters, object analysis, operational simulation, and keyparameters analysis. Meanwhile, the design space of an unmanned aerial vehicle applied in earthquake search and rescue SoS is explored based on this methodology. The results show that applying SoS simulation into design phase has important reference value for designers on aircraft conceptual design.

Mitigating Design Fixation: A Visualization Tool for Enhancing Situation Awareness

Dongwook Hwang(황동욱) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11

Objective: The aim of this study is to develop an information acquisition and display system called the Situation Awareness Support System (SASS) to stimulate a designer’s creativity. Background: External stimuli can stimulate a designer’s creativity and improve the outcome of design ideation for product/service concept generation. A psychological phenomenon that may occur during such utilization of external stimuli is design fixation, which is widely believed to adversely affect the ideation outcome. One of the difficulties in preventing or alleviating design fixation is that the designer may not easily detect or predict its occurrence during the mentally demanding task of ideation. Method: The current study develops a situation awareness support system, which helps the novice designer perceive and predict the occurrences of design fixation. The situation awareness support system is empirically evaluated in its utility in mitigating design fixation. Results: The study result shows that the situation awareness support system can help the novice designer to mitigate design fixation while not influencing significant impact on the ideation performance. Conclusion: This is the first research study that attempts to use the concept of situation awareness in order to mitigate design fixation problems.

“A” Parametric Approach Combined with Operations Research Model for Estimating “A” Cost of Space Systems at Conceptual Design Phase

Byoungsoo Kim,Seokmin Ahn 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-

Throughout the earlier era of space exploration, the main space systems design driver was the concept of maximizing space mission performance under weak time and cost constraints but with conservative technology risk constraints: i.e., "design-to-performance". Design-to-performance attempted to satisfy a set of predefined performance requirements at minimum risk and cost: performance first and cost second. However, after the end of the Cold War, as the non-military, commercial aspects of space missions appeared more important than before, cost became a more dominant factor. In this new environment, space systems design became a difficult problem to model. Now, the objective of space systems design is to maximize mission goals under firm cost and schedule constraints but with prudent technology risk acceptance, or, equivalently maximizing space mission performance per estimated unit cost. Therefore, space missions should be designed and scoped to emphasize overall mission success within cost and schedule constraints by incorporating sufficient margins, reserves, and subsystem resiliency and by readily adopting innovative ideas. The real question in the space systems design domain under this approach is no longer. "Can we build the same space system for less money?" Rather, it is "Can we achieve or exceed the overall space mission objectives for agreed upon or less money and time constraints by readily adopting more innovative new technology?" Currently, space systems designers, therefore, tend to pursue a proven space systems design architecture or modify an existing idea rather than incorporating totally new system design alternatives. This tendency can be described by the "design-to-cost" philosophy that necessarily introduced the concept of "faster, better, cheaper" (low-cost, small-sat). In this paper, spurred by this new, more challenging environment, we are to show possible approaches to answer "a solution" of a space systems design at conceptual phase for a specific mission. Here. "a solution" is defined as the most favorable alternative design for the system on the basis of the decision-making design criteria.

“개념설계” 측면에서 국내신도시의 평가와 개선방향에 관한 연구: 1기·2기·3기 신도시 참여 전문가를 중심으로

김용진(Kim, Yong-Jin),권일(Kweon, Ihl) 한국도시행정학회 2021 도시 행정 학보 Vol.34 No.3

본 연구는 우리나라 신도시 개발 과정에 있어서의 개념설계의 필요성, 그리고 과거 신도시에 있어서 개념설계 측면에서의 평가를 바탕으로 신도시 조성 과정에 개념설계 도입 방안을 마련하는데 그 목적이 있다. 연구 목적을 달성하기 위해, 본 연구에서는 1기·2기·3기 신도시 과정에 참여한 경험이 있는 교수, LH공사 임직원, 엔지니어링업체 전문가 등을 대상으로 한 전문가그룹인터뷰를 통해 개념설계 도입방안에 대한 보다 전문적인 대안을 모색하고자 하였다. 본 연구는 우리나라의 신도시 조성 경험에도 불구하고 체계적인 경험이 축적되지 못하는 상황에서 산업적 경쟁력이라는 측면에서 개념설계를 도입하는데 기본적인 논의를 시작하였다는 점에서 의미를 지닌다. 무엇보다 신도시 조성 과정에 대해 사업의 속도와 효율성이 아닌, 경험을 축적하여 K-신도시 조성의 차별성과 경쟁력을 갖추기 위한 시사점을 제공하였다. In this study, we tried to analyze the process of creating a new town in terms of "concept design," which is drawing attention from all industries, and to find ways to introduce conceptual design and strengthen capabilities in the construction of new towns in Korea. To this end, this study conducted FGI focusing on experts who participated in the 1st, 2nd, and 3rd new towns. As a result of the analysis, all experts agreed on the importance and necessity of conceptual design in the construction of new towns. Next, an evaluation was conducted on the application of conceptual design of new towns in Korea, and a discussion was conducted on the application stage of conceptual design. Lastly, we discussed ways to institutionalize the conceptual design in the construction of new towns. This study is meaningful in that it evaluated the process of creating a new town and started discussions to introduce it in terms of conceptual design.