Application of the random decrement technique to the determination of structural damping
Abstract
The random decrement technique (RDT) was applied to the determination of the damping of a cantilevered structure at very low displacments in a laboratory environment at ambient conditions. Modal testing techniques were applied at an intermediate displacement level to validate the RDT. The modal analysis techniques produced damping estimates that were comparable with the RDT results at intermediate displacements. The technique was further investigated by applying it to analytically generated structural responses. The results had no more than 20 percent error in the calculated damping estimates. Digital bypass filtering and least squares analysis are shown to be necessary complements to the RDT.
- Publication:
-
13th Aerospace Testing Seminar
- Pub Date:
- 1991
- Bibcode:
- 1991aets.proc..379S
- Keywords:
-
- Damping;
- Dynamic Structural Analysis;
- Dynamic Tests;
- Modal Response;
- Structural Mechanics