Accession Number : ADP004732

Title :   An Approach to the Sizing of Discrete Viscous Structural Dampers Using an Extension of the Finite Element Approach and Modal Strain Energy,

Corporate Author : MARTIN MARIETTA CORP DENVER CO

Personal Author(s) : Rice,R. B. ; Dalton,E. C.

Report Date : NOV 1984

Pagination or Media Count : 21

Abstract : A method for determining viscous damper values and damper locations for a structure which has particular damping requirements is presented in this paper. The method is intended as a starting point in a design process. The finite element approach and concept of modal strain energy are heavily relied upon. To illustrate the solution sequences, a sample problem is included in the report. The method was applied to a large space-based telescope in which damping of optical support structures is critical for tracking and pointing accuracy. The results of the sample problem indicated that the method will yield the desired amount of damping in a structure provided that the complex mode shapes do not significantly deviate from the classical mode shapes. Since the characterization of non-viscous dampers is considerably more complicated than viscous dampers, the author suggests that the method presented in this paper be used in the early phases of design. If viscous damping values are known, the range of other candidate dampers may be narrowed. (Author)

Descriptors :   *DAMPING, *TELESCOPING STRUCTURES, SPACE BASED, FINITE ELEMENT ANALYSIS, METHODOLOGY

Distribution Statement : APPROVED FOR PUBLIC RELEASE