A CONSTRUCTION METHODOLOGY OF THE LARGE SOLAR-ARRAY SYSTEM OF A SOLARPOWER SATELLITE

A construction methodology of the large solar array system is investig ated, assuming the SPS 2000 model of ISAS, the experimental model for the future Solar Power Satellite in Japan. The structure elements such as trusses, beams and solar arrays are transported from the ground 10 times by using a rocket. First, the basic module is assembled and the n the subsequent modules are attached towards N-S direction. The const ruction sequence how to form this basic module has already been examin ed under the gravity gradient environment. This paper discusses how to extend the flexible solar array sheets over this module. First, the d ynamic model when extending an array is developed, by including the mo ment of inertia and angular momentum change during the extension. Then , the dynamic behaviors during extension are examined. When an extensi on is made by one array by one, the momentum by extending array and th e moment of inertia change induce larger oscillation around all three axes of the basic module. Thus the method to minimize these changes by extending the pair of the arrays simultaneously is studied for reduci ng the attitude vibration. In conclusion, a method of extending two ar rays simultaneously is judged desirable for a practical application.