Accession Number:

ADA279877

Title:

Shaping Inputs to Reduce Vibration in Flexible Space Structures

Descriptive Note:

Technical rept.

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE ARTIFICIAL INTELLIGENCE LAB

Personal Author(s):

Report Date:

1992-06-01

Pagination or Media Count:

131.0

Abstract:

A theoretical background of impulse shaping is presented along with some insight into the methods of calculating multiple mode sequences. The Middeck Active Control Experiment MACE, an MITNASA space shuttle experiment, is then described as the testbed for the experiments. A nonlinear simulation is used to verify the effectiveness of these shapers on a model of MACE. Finally, hardware, experimental results are presented and analyzed. Some conclusions were derived from the results of testing. First, it was found that the shaper was effective in canceling the slowest frequency of the structure, but was less successful in the higher modes. Second, large angle movements decreased the effective vibration cancellation. Third, although methods exist which can increase the robustness of an impulse shaper, none were found to aid in canceling the effects of nonlinearities caused by large angle moves. Fourth, the bandwidth of the controller was found to be closely associated with the effectiveness of the shaper. Shaping, Mace, Vibration, Discos Modes,

Subject Categories:

  • Cybernetics
  • Unmanned Spacecraft
  • Manned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE