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Integrated Active and Passive Control Design Methodology for the Larc Csi Evolutionary Model

Integrated Active and Passive Control Design Methodology for the Larc Csi Evolutionary Model


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About the Book

A general design methodology to integrate active control with passive damping was demonstrated on the NASA LaRC CSI Evolutionary Model (CEM), a ground testbed for future large, flexible spacecraft. Vibration suppression controllers designed for Line-of Sight (LOS) minimization were successfully implemented on the CEM. A frequency-shaped H2 methodology was developed, allowing the designer to specify the roll-off of the MIMO compensator. A closed loop bandwidth of 4 Hz, including the six rigid body modes and the first three dominant elastic modes of the CEM was achieved. Good agreement was demonstrated between experimental data and analytical predictions for the closed loop frequency response and random tests. Using the Modal Strain Energy (MSE) method, a passive damping treatment consisting of 60 viscoelastically damped struts was designed, fabricated and implemented on the CEM. Damping levels for the targeted modes were more than an order of magnitude larger than for the undamped structure. Using measured loss and stiffness data for the individual damped struts, analytical predictions of the damping levels were very close to the experimental values in the (1-10) Hz frequency range where the open loop model matched the experimental data. An integrated active/passive controller was successfully implemented on the CEM and was evaluated against an active-only controller. A two-fold increase in the effective control bandwidth and further reductions of 30 percent to 50 percent in the LOS RMS outputs were achieved compared to an active-only controller. Superior performance was also obtained compared to a High-Authority/Low-Authority (HAC/LAC) controller. Voth, Christopher T. and Richards, Kenneth E., Jr. and Schmitz, Eric and Gehling, Russel N. and Morgenthaler, Daniel R. Unspecified Center NASA-CR-4580, NAS 1.26:4580 NAS1-19371; RTOP 590-14-91-52...


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Product Details
  • ISBN-13: 9781724256331
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 374
  • Spine Width: 20 mm
  • Width: 216 mm
  • ISBN-10: 1724256335
  • Publisher Date: 25 Jul 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 866 gr


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