System Level Design And Analysis Of Truss Structures Damped By Viscous Struts

Item

Title
System Level Design And Analysis Of Truss Structures Damped By Viscous Struts
Report Number
WL-TR-91-3078 Volume III, p. GCC-1 thru GCC-14
Creator
Yui, Y. C.
Corporate Author
Lockheed Missiles & Space Company
Date
1991
Date Issued
1991-08
Extent
14
Identifier
ADA241313
Format
1 online resource
Abstract
A procedure is presented to design passive damping into large truss structures using viscously damped struts to enhance vibration attenuation or stability of controls system. A method is derived from the equations of motion using Rayleigh-Ritz method to relate the approximate contributions of a viscously damped strut to the system level modal damping ratios and frequencies. Strut placement
locations, the total number of struts required · and the damping characteristics of struts can be easily identified and calculated. The procedure consists of three steps:
1) extract structural characteristics from the undamped baseline finite element model, 2) on a mode by mode basis, perform damping design using the derived equations to meet system level requirements and 3) update finite element model to include damping mechanism and perform verification analysis using complex eigensolution.
Description
A procedure is presented to design passive damping into large truss structures using viscously damped struts to enhance vibration attenuation or stability of controls system. A method is derived from the equations of motion using Rayleigh-Ritz method to relate the approximate contributions of a viscously damped strut to the system level modal damping ratios and frequencies. Strut placement
locations, the total number of struts required · and the damping characteristics of struts can be easily identified and calculated. The procedure consists of three steps:
1) extract structural characteristics from the undamped baseline finite element model, 2) on a mode by mode basis, perform damping design using the derived equations to meet system level requirements and 3) update finite element model to include damping mechanism and perform verification analysis using complex eigensolution.
Distribution Classification
1
Distribution Conflict
No
DTIC Record Exists
No
Illinois Tech Related
No
Report Availability
Full text available
Type
article
Is Part Of
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)
Media
articleGCC

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Title Class
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)

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