Citation
Abstract
Condensed degree-of-freedom (effective-mass) models are compared with large degreeof-freedom finite-element models of a representative antenna-tipping and alidade structure, for both “locked” and “‘free-rotor” configurations. It is shown that: a) the effectivemass models accurately reproduce the lower-mode natural frequencies of the finite element model; b) frequency responses for the two types of models are in agreement up to at least 16 rad/s for specific points; and c) transient responses computed for the same points are in good agreement. It is concluded that the effective-mass model, which best represents the five lower modes of the finite-element model, is a sufficient representation of the structure for future incorporation with a total servo control-structure dynamic simulation.
Details
- Volume
- 42-80
- Published
- February 15, 1985
- Pages
- 40–61
- File Size
- 694.5 KB