Multi-Objective Trajectory Optimization by a Hierarchical Gradient Algorithm with Fuzzy Decision Logic-Application to Slew Maneuver Problems of a Flexible Space Structure-

Kojima Hirohisa, Nakajima Nobuyuki

doi:10.2322/jjsass.51.589

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Other Title

ファジィ化階層勾配法による多目的軌道最適化－柔軟宇宙構造物のスルーマヌーバ問題への適用－
ファジィカカイソウコウバイホウニヨルタモクテキキドウサイテキカジュウナンウチュウコウゾウブツノスルーマヌーバモンダイエノテキヨウ
—Application to Slew Maneuver Problems of a Flexible Space Structure—
—柔軟宇宙構造物のスルーマヌーバ問題への適用—

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Abstract

The rest-to-rest maneuver problem of the flexible space structure is the two point boundary value problem (TPBVP) and is solved by some gradient methods. If TPBVP is strongly restricted by the constraints, TBVP becomes ill-defined problem, and the solution meeting all constraints cannot be obtained. However, reasonable suboptimal solutions are often needed since real plants are necessary to be controlled. In order to obtain such suboptimal solutions, we have developed a modified version of the hierarchy gradient method by installing fuzzy decision logic. Constraints are classified into non-fuzzy constraints and fuzzy constraints according to their priorities. Fuzzy constraints having trade-off relationship with each other are compromised reasonably by fuzzy decision logic. The usefulness of the proposed method is numerically and experimentally demonstrated by applying to the rest-to-rest slew maneuver problem of a flexible space structure, where fuzzy constraints are final time, sensitivity of residual vibration energy with respect to the structure frequency uncertainty, and maximum bending moment at the root of flexible appendage.

Journal

JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES

JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 51 (598), 589-596, 2003

THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES

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