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The Experimental Assembly of Structures in EVA and the Assembly Concept for Construction of Erectable Space Structures, or EASE/ACCESS, were a pair of space shuttle flight experiments that were performed on STS-61-B, on November 29 and December 1, 1985. The purpose of the experiments was to study how quickly astronauts would become proficient at assembling space structures during extravehicular activity, and how quickly they would become fatigued, and to explore various construction and maintenance techniques. In particular, researchers studied the applied moments of inertia arising in the manual assembly of a large space structure. EASE was a project of NASA's Marshall Space Flight Center and the Space Systems Laboratory at the Massachusetts Institute of Technology (later at the University of Maryland), while ACCESS was developed by NASA's Langley Research Center. ==Experiment and EVAs== Astronauts Jerry L. Ross and Sherwood C. Spring repeatedly assembled a tetrahedral truss (EASE) and a triangular column truss (ACCESS) during two extra-vehicular activities (EVAs). The first EVA was devoted to studying human performance in assembly techniques, while the second was dedicated to supplementary experiments, including alternative construction techniques and maintenance scenarios. The EASE structure consisted of six identical aluminum beams, each long and with a mass of , connected by four nodal joints. ACCESS consisted of 93 tubular aluminum struts, each in diameter—thirty-three struts, and sixty struts—connected by thirty-three nodal joints.〔 While assembling the EASE structure, the astronauts moved about the structure under their own power. For the assembly of the ACCESS structure, the astronauts were secured to a mobile platform on the Remote Manipulator System, which was guided by astronaut Mary L. Cleave.〔 A stereoscopic camera system recorded the movements of the structural beams during assembly. Taking into account the effects of inertia, drag, and virtual mass, researchers used this data to reconstruct the applied moments of inertia. The structure was also assembled in neutral buoyancy simulation, and the two environments were compared. The EVAs were also recorded by an IMAX camera mounted in the shuttle cargo bay. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「EASE/ACCESS」の詳細全文を読む スポンサード リンク
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