Accession Number:

ADA359146

Title:

Correcting a Significant and Consistent Error in the Modal Damping Obtained using Transient Vibration Data

Descriptive Note:

Technical rept.

Corporate Author:

COLORADO STATE UNIV FORT COLLINS DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1998-04-01

Pagination or Media Count:

13.0

Abstract:

This report investigates the experimental vibration technique of impact excitation when used to obtain frequency response functions. It is shown that current practices introduce a consistent error in the derived modal damping estimates. The error can be significant, with levels of damping being wrongly predicted by a factor of three or more. The report identifies the source of the error. It then derives and presents a simple correction to be applied to the observed modal damping estimates. The procedure is demonstrated by experiment.

Subject Categories:

  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE