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The Seventies Readings 1. Chap. 1, \Spaceflight and the Myth of Presidential Leadership.\ 2. Chap. 4 and 5, \Beyond Horizons. 3. Chap. and 2, Wheelon. Strategic Themes: 1. Retrenchment for NASA-NASA and the country out of sync. 2. A truck to nowhere-the seeds of the Challenger disaster
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UNCLASSIFIED Unclassified Clinton administration 1993 National security space activities shall contribute to US national security by supporting right of self-defense of US, allies and friends deterring, warning, and defending against enemy attack assuring hostile forces cannot prevent our use of space ountering, if necessary, space systems and services used for hostile purposes enhancing operations of U. S. and allied forces ensuring our ability to conduct military and intelligence space-related satisfying military and intelligence
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Explosion of Commercial Space and the Implications for National Security General(Ret) Thomas S. Moorman, Jr Background Space not mainstream · Desert storn Air Force role Space Service Strategic Vision Budget Outlook
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History and Policy in the Fifties Reading: Chapters 1-10, The Heavens and the Earth Big Themes: Technocracy as a way for a nation to accomplish tasks mon The impact of the thermonuclear bomb and the technology of missiles The Cold War as a contest between Communism and Capitalism
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一、起落架的载荷情况多 二、需要作机构运动 三、要从受力要求的观点和机构运动要求的观 点来分析起落架的构造
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16.61 Aerospace Dynamics Spring 2003 Derivation of lagrangian equations Basic Concept: Virtual Work Consider system of N particles located at(, x2, x,,.x3N )with 3 forces per particle(f. f, f..fn). each in the positive
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16.61 Aerospace Dynamics Spring 2003 Lagrange's equations Joseph-Louis lagrange 1736-1813 http://www-groups.dcs.st-and.ac.uk/-history/mathematicians/lagranGe.html Born in Italy. later lived in berlin and paris Originally studied to be a lawyer
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ECTURE +2 RIGId BoDY DYNAnIC 工Ap1CAT105FA。R工 GENERAL ROTATIONAL JYNMICS EULER'S EQuATIoN of MOTIoN TORQVE fREE SPECIAL CAsEs PRIMARY LESSONS 3D RoTATONAL MOTION MUCH MORE COMPLEX
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16.61 Aerospace Dynamics Spring 2003 Generalized forces revisited Derived Lagrange s equation from d'Alembert's equation ∑m(8x+16y+22)=∑(Fx+F+F。=) Define virtual displacements sx Substitute in and noting the independence of the 8q,, for each
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Lecture #4 16.61 Aerospace Dynamics Extension to multiple intermediate frames(two) Copyright 2002 by Jonathan How
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