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Numerical Prediction of Scientific Balloon Trajectories While Considering Various Uncertainties : 불확실성을 고려한 고고도 과학 기구의 궤적 예측 연구
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | 이관중 | - |
dc.contributor.author | 이용선 | - |
dc.date.accessioned | 2017-07-14T03:43:45Z | - |
dc.date.available | 2017-07-14T03:43:45Z | - |
dc.date.issued | 2017-02 | - |
dc.identifier.other | 000000140809 | - |
dc.identifier.uri | https://hdl.handle.net/10371/123925 | - |
dc.description | 학위논문 (석사)-- 서울대학교 대학원 : 기계항공공학부, 2017. 2. 이관중. | - |
dc.description.abstract | Before launching a scientific balloon, one needs to precisely predict its trajectory to avoid any possible accidents, as there are no means to control the horizontal motion of the balloon once it is launched. Although earlier studies developed simulation programs that predicted the trajectory of a scientific balloon with reasonable accuracy, the simulated results were hardly the same as the actual balloon flight because there existed uncertainties in balloon trajectory prediction. To address the difference between the predicted and actual flight trajectories, the prediction should be probabilistic, which means the uncertainties involved in the calculation should be taken into account. In the present work, a numerical simulation program is developed to predict the trajectories of a balloon, while considering various uncertainties, with the use of a Monte Carlo simulation. Sensitivity studies are performed to identify the most dominant uncertainty parameter in the distribution of landing points of the balloon flight. Operational uncertainty represented by the amount of buoyant gas is shown to be the most significant source of the prediction error, although it can be overcome by controlling the amount of lifting gas during the actual flight. | - |
dc.description.tableofcontents | I. Introduction 1
II. Simulation program development and its validation 6 A. Design of the Balloon 7 B. Equations of Motion 9 C. Thermal Model 11 D. Code Validation 14 E. Balloon Specifications and Flight Simulation Information 17 III. Uncertainty Analysis Based on Monte Carlo Simulation 24 A. Operational Uncertainty: Uncertainty in Helium Injection 27 B. Uncertainty in the Prediction Model: Uncertainty in the Drag Coefficient 28 C. Environmental Uncertainty: Uncertainty in the Wind Profile Data 30 D. Manufactural Uncertainty: Uncertainty in the Volume of the Balloon 33 E. Results and Discussions 34 IV. Conclusions 46 Appendix A: Specific Procedures to Design a Natural Shape Balloon 48 Appendix B: Equations to Calculate the Heat Fluxes in the Thermal Model 52 References 55 | - |
dc.format | application/pdf | - |
dc.format.extent | 3540136 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | Scientific Balloon | - |
dc.subject | High Altitude Balloon | - |
dc.subject | Uncertainty | - |
dc.subject | Trajectory Prediction | - |
dc.subject | Monte Carlo Simulation | - |
dc.subject.ddc | 621 | - |
dc.title | Numerical Prediction of Scientific Balloon Trajectories While Considering Various Uncertainties | - |
dc.title.alternative | 불확실성을 고려한 고고도 과학 기구의 궤적 예측 연구 | - |
dc.type | Thesis | - |
dc.description.degree | Master | - |
dc.citation.pages | 57 | - |
dc.contributor.affiliation | 공과대학 기계항공공학부 | - |
dc.date.awarded | 2017-02 | - |
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