Analytical And Experimental Modal Analysis Of A Two-Tiered Structure

Item

Title
Analytical And Experimental Modal Analysis Of A Two-Tiered Structure
Report Number
WL-TR-91-3078 Volume I, p. DAB-1 thru DAB-11
Creator
Vu, H. V.
Vuong, T. K.
Flynn, Jr., W. C.
Corporate Author
Department of Mechanical Engineering,California State University, Long Beach
Laboratory
Wright Laboratory
Date
1991
Date Issued
1991-08
Extent
11
Contract
Laboratory Research - No Contract
DoD Project
2401
DoD Task
240104
Identifier
ADA241311
Format
1 online resource
Abstract
A test structure, namely a two-tiered structure (TIS), was used as a physical model for obtaining modal parameters of flexible structures. These parameters, which were determined analytically and experimentally, are natural frequencies, mode shapes, and damping ratios. In the analytical portion, finite element method (FEM) was used with MSC/NASTRAN, MSC/pal 2, and MSC/MOD. In the experimental part, the structure was excited by random noise, and frequency-response function (FRF) plot and modal parameters were obtained. Both the HP 3566N3567 A (Hewlett Packard Spectrum/Network Analyzer) and STAR System (Structural Measurement Systems software) were utilized. An exact model-reduction technique was used to obtain a complete mathematical model of a reduced-order system, which includes the reduced-order physical mass, stiffness, and damping matrices.
Description
A test structure, namely a two-tiered structure (TIS), was used as a physical model for obtaining modal parameters of flexible structures. These parameters, which were determined analytically and experimentally, are natural frequencies, mode shapes, and damping ratios. In the analytical portion, finite element method (FEM) was used with MSC/NASTRAN, MSC/pal 2, and MSC/MOD. In the experimental part, the structure was excited by random noise, and frequency-response function (FRF) plot and modal parameters were obtained. Both the HP 3566N3567 A (Hewlett Packard Spectrum/Network Analyzer) and STAR System (Structural Measurement Systems software) were utilized. An exact model-reduction technique was used to obtain a complete mathematical model of a reduced-order system, which includes the reduced-order physical mass, stiffness, and damping matrices.
Distribution Classification
1
Distribution Conflict
No
DTIC Record Exists
No
Illinois Tech Related
No
Photo Quality
Not Needed
Report Availability
Full text available
Type
article
Media
article23