Analytical And Experimental Modal Analysis Of A Two-Tiered Structure
Report Number: WL-TR-91-3078 Volume I, p. DAB-1 thru DAB-11
Author(s): Vu, H. V., Vuong, T. K., Flynn, Jr., W. C.
Corporate Author(s): Department of Mechanical Engineering,California State University, Long Beach
Laboratory: Wright Laboratory
Date of Publication: 1991-08
Pages: 11
Contract: Laboratory Research - No Contract
DoD Project: 2401
DoD Task: 240104
Identifier: This paper is part of a conference proceedings. See ADA241311
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.
Author(s): Vu, H. V., Vuong, T. K., Flynn, Jr., W. C.
Corporate Author(s): Department of Mechanical Engineering,California State University, Long Beach
Laboratory: Wright Laboratory
Date of Publication: 1991-08
Pages: 11
Contract: Laboratory Research - No Contract
DoD Project: 2401
DoD Task: 240104
Identifier: This paper is part of a conference proceedings. See ADA241311
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.