Application of the least squares times domain algorithm for efficient modal parameter estimation

Gun Myung Lee, Martin Wesley Trethewey

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The present work will discuss the application of a finite difference equation based method for vibration modal parameter estimation. Since the method is well developed for dynamic system analysis, the mathematical development will only be briefly reviewed. The paper will concentrate on the application of the scheme for efficient and rapid estimation of structural modal parameters. A method to evaluate the quality of the modal model with respect to the original data will be presented and discussed. The testing and analysis scheme will be applied to several sets of simulated, laboratory and structural data. The results illustrate that the method can extract accurate modal parameters with as few as 200 time samples in a computationally efficient fashion. An analysis of the parameter sensitivity shows that the modal damping ratio is the most difficult to estimate. The potential for incorporating a rapid identification method into an on-site analysis scheme is discussed.

Original languageEnglish (US)
Pages (from-to)21-38
Number of pages18
JournalMechanical Systems and Signal Processing
Issue number1
StatePublished - Jan 1 1988

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Signal Processing
  • Civil and Structural Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Computer Science Applications


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