2022 Fiscal Year Final Research Report
Development of High Reliable Optimization System for Asteroid Deflection Missions
| Project/Area Number |
19K15210
|
|---|
| Research Category |
Grant-in-Aid for Early-Career Scientists
|
| Allocation Type | Multi-year Fund |
|---|
| Review Section |
Basic Section 24010:Aerospace engineering-related
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2019-04-01 – 2023-03-31
|
| Keywords | near-Earth asteroid / trajectory optimization / kinetic impactor / gravity tractor / asteroid deflection / artificial halo orbit |
|---|
| Outline of Final Research Achievements |
Methods to deflect Earth-threatening asteroids from Earth collision routes were investigated. For a kinetic impactor that impacts the asteroid with hypervelocity, a trajectory optimization method that effectively increases the impact-geometry was proposed. The impact-geometry is defined by the velocity vectors at the impact and the achievable deflection distance is proportional to the impact-geometry. The proposed method can increase the deflection distance without increasing the impact speed.
For the gravity tractor which tows the asteroid by using the gravitational interaction between the asteroid and spacecraft, putting the spacecraft into an artificial halo orbit (AHO) was proposed. Since a spacecraft in an AHO moves circularly in a plane that is perpendicular to the towing direction of the asteroid, multiple spacecraft can be used for towing. Equations of motion and laws to control the spacecraft in AHOs were proposed. The effectiveness of the proposed law was numerically shown.
|
| Free Research Field |
航空宇宙工学
|
| Academic Significance and Societal Importance of the Research Achievements |
天体の衝突災害は地球規模の問題であり，研究の社会的意義は非常に大きい．衝突機の速度ベクトルの幾何関係が定義するimpact-geometryの増大を行う軌道設計手法は独自のものであり，学術的に重要である．得られた成果である速度の大きさの抑制と軌道変更距離の増大の両立は，ミッション全体の成功率を改善するものであり，意義は大きい．重力トラクタにおいて導いた運動方程式は人工ハロー軌道にある宇宙機制御に特化したものである．ハロー軌道の維持，ハロー軌道間の遷移という２つの制御則の有効性を架空の牽引ミッションを通して示されており，小天体の軌道変更の研究分野に対するインパクトは十分である．
|
