One of the difficulties encountered when controlling large space structures is that the structural dynamics are not known well enough. If a finite element model of the structure is used to develop the control system, then the typical errors in the mode frequencies and mode shapes that result will lead to a control system that at best does not perform as well a possible and at worst could be unstable. The dilemma is that large space structures can not be built and tested on the ground - one must wait until the structure is designed and built in orbit before reasonable testing may begin. The problems os this 'on-orbit' dynamic testing is discussed here in terms of a phase locked loop adaptive spectrum analyzer that could provide mode frequencies and mode shapes for control design during the initial orbital operations of a large space structure. (DePo)
On-orbit testing for large space structures
In-Orbit Pruefung grosser Raumstation1n
AIAA-Papers ; 1-4
1979
4 Seiten, 4 Bilder, 4 Quellen
Conference paper
English
On orbit testing for large space structures
AIAA | 1979
|On-orbit modal identification of large space structures
Tema Archive | 1992
|On orbit damage assessment for large space structures
NTRS | 1987
|On-orbit damage assessment for large space structures
NTRS | 1988
|On-orbit damage assessment for large space structures
AIAA | 1988
|