Author:
Publisher:
ISBN:
Category : Dwellings
Languages : en
Pages : 0

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Author: United States. Congress. Office of Technology Assessment
Publisher:
ISBN:
Category : Technology assessment
Languages : en
Pages : 24

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Author: United States. Department of Energy. Environmental Impacts Division
Publisher:
ISBN:
Category :
Languages : en
Pages : 1224

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Author:
Publisher:
ISBN:
Category : Environmental engineering
Languages : en
Pages : 1224

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Author: National Research Council
Publisher: National Academies Press
ISBN: 0309047803
Category : Technology & Engineering
Languages : en
Pages : 244

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Book Description
The perspectives of technologists, economists, and policymakers are brought together in this volume. It includes chapters dealing with approaches to assessment of technology leadership in the United States and Japan, an evaluation of future impacts of eroding U.S. technological preeminence, an analysis of the changing nature of technology-based global competition, and a discussion of policy options for the United States.

Author: Vary T. Coates
Publisher:
ISBN:
Category : Technology assessment
Languages : en
Pages : 124

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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 488

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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 486

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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 1020

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Author:
Publisher: DIANE Publishing
ISBN: 1428924574
Category :
Languages : en
Pages : 297

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Book Description
During energy crisis at the end of the Sixties, a new idea to exploit solar energy arose: Solar Power Satellites. These satellites need a huge surface to collect enough solar energy to be beamed on Earth by means of a microwave power transfer system. Different concepts appeared during last forty years and a lot of studies addressing the SPS economical feasibility have been published. In this work a particular concept is considered, the JAXA Reference Concept 2003. It is a formation flying SPS, composed by two reflectors and a central array panel. The objective of the work is to study two major problems this concept presents. Due to its dimensions, the satellite orbit will suffer from important orbital perturbations and since formation flying satellites need a tight orbit control, the first task is to derive an analytical approximation to perform relative perturbed orbit propagation for formation flying satellite. This objective is pursued starting from a H. Schaub’s formulation in which formation flying satellites unperturbed orbit is described by means of an approximated relation function of orbital element differences. This formulation is merged with another approach, developed in a previous work, which gives, analytically, orbital parameters variation when a perturbation acts on the spacecraft. The result is a very interesting algorithm, able to perform the assigned task with a relative error lower than 3% over one simulated orbit. The second objective concerns structural control. It is not possible to consider these huge satellites as rigid bodies, first natural frequencies will be certainly excited during operations. So that, the second task is the study of actuator placement optimization for flexible satellites, very useful for tight pointing requirements. A FEM model is developed modeling the SPS as a frame of beams and a global controllability index is obtained combining modal controllability and component cost analysis. The maximization of this parameter,