Keywords

Computer programs, Minicomputers, Vibration, Ibrahim Time Domain (ITD) algorithm, Modal parameter identification, DEC PDP-11/34 implementation, Time-domain free-response analysis, Closely spaced and heavily damped modes

Abstract

Conventional modal analysis is performed using FFT Analyzers with modal analysis software developed by one of many test/analysis software vendors. The analysis is performed in the frequency domain using frequency response functions. A recent advancement in modal analysis involves analyzing the measured free response of a structure in the time domain. The Ibrahim Time Domain (ITD) Algorithm is such a method which has been used and verified at government environmental test facilities. The ITD is an accurate numeric solution. Minimal operator interaction is required for proper performance of the algorithm. The results of the ITD Algorithm are far superior to those of conventional frequency response methods when the test structure has closely spaced or heavily damped modes of vibration. Currently, the ITD exists only on mainframe computers. The purpose of this research is to adapt the numeric routine to a mini-computer (DEC PDP-11/34). In this way, the ITD Algorithm could be incorporated in any environmental test facility with access to a mini-computer.

Notes

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Graduation Date

1984

Semester

Spring

Advisor

Jenkins, David R.

Degree

Master of Science (M.S.)

College

College of Engineering

Degree Program

Engineering

Format

PDF

Pages

118 pages

Language

English

Rights

Public Domain

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0015922

Subjects

Time-domain analysis--Computer programs; Modal analysis--Data processing; System identification--Computer programs; Structural dynamics--Computer programs; Vibration--Computer programs

Accessibility Status

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