Computer programs, Minicomputers, Vibration
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.
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Jenkins, David R.
Master of Science (M.S.)
College of Engineering
Length of Campus-only Access
Masters Thesis (Open Access)
Cogeos, Mary T., "Adaption and Optimization of the Ibrahim Time Domain (ITD) Modal Parameter Identification Algorithm for Mini-Computer Use" (1984). Retrospective Theses and Dissertations. 4700.