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"NASA Technical Reports Server (NTRS) 19900004178: The Dynamics And Control Of Large Flexible Space Structures - 12, Supplement 11" and the language of the book is English.


“NASA Technical Reports Server (NTRS) 19900004178: The Dynamics And Control Of Large Flexible Space Structures - 12, Supplement 11” Metadata:

  • Title: ➤  NASA Technical Reports Server (NTRS) 19900004178: The Dynamics And Control Of Large Flexible Space Structures - 12, Supplement 11
  • Author: ➤  
  • Language: English

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  • Internet Archive ID: NASA_NTRS_Archive_19900004178

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"NASA Technical Reports Server (NTRS) 19900004178: The Dynamics And Control Of Large Flexible Space Structures - 12, Supplement 11" Description:

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The rapid 2-D slewing and vibrational control of the unsymmetrical flexible SCOLE (Spacecraft Control Laboratory Experiment) with multi-bounded controls is considered. Pontryagin's Maximum Principle is applied to the nonlinear equations of the system to derive the necessary conditions for the optimal control. The resulting two point boundary value problem is then solved by using the quasilinearization technique, and the near minimum time is obtained by sequentially shortening the slewing time until the controls are near the bang-bang type. The tradeoff between the minimum time and the minimum flexible amplitude requirements is discussed. The numerical results show that the responses of the nonlinear system are significantly different from those of the linearized system for rapid slewing. The SCOLE station-keeping closed loop dynamics are re-examined by employing a slightly different method for developing the equations of motion in which higher order terms in the expressions for the mast modal shape functions are now included. A preliminary study on the effect of actuator mass on the closed loop dynamics of large space systems is conducted. A numerical example based on a coupled two-mass two-spring system illustrates the effect of changes caused in the mass and stiffness matrices on the closed loop system eigenvalues. In certain cases the need for redesigning control laws previously synthesized, but not accounting for actuator masses, is indicated.

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