Cost-effective test methods for Shuttle payloads
Abstract
Techniques are discussed for deriving constrained vibration mode shapes for space shuttle payloads using unconstrained or free-boundary dynamic properties. Application of the residual flexibility method requires measurement of a set of free boundary modes plus the residual flexibility of the payload-to-orbiter interfaces. The mass-additive approach involves the measurement of unconstrained modes and frequencies of a payload with large masses attached to the interfaces. In either case, the orbiter interfaces of the test-verified payload model are analytically constrained to provide the mode shapes for the shuttle-constrained configuration. Use of these methods or a hybrid combination of them for structures to which they are applicable allows the difficulty and expense associated with development and verification of fixed-base test fixtures to be avoided.
- Publication:
-
In Huntsville Association of Technical Societies
- Pub Date:
- 1993
- Bibcode:
- 1993tabessymp.....T
- Keywords:
-
- Cost Effectiveness;
- Dynamic Characteristics;
- Dynamic Models;
- Dynamic Structural Analysis;
- Mathematical Models;
- Performance Tests;
- Space Shuttle Payloads;
- Spacecraft Models;
- Flexibility;
- Free Boundaries;
- Vibration Mode;
- Space Transportation