Experimental complex modal analysis of machine tool structures

Y. C. Shin*, K. F. Eman, S. M. Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Despite the well-established theories and considerable experimental research, the identification of the complex mode shapes of a real machine tool structure with general damping still remains a formidable task. Moreover, the existence of closely coupled modes with heavy damping introduces additional difficulties. This paper presents a detailed procedure for experimental complex modal analysis of a machine tool structure by the Dynamic Data System method. The accuracy and efficiency are first illustrated by numerical examples through simulation studies. It has been shown that closely coupled modes and modes with heavy damping can be successfully identified from both simulated and actual experimental data from a machine tool. Complex mode shapes were also obtained without adding any complexity or losing accuracy as compared to normal mode analysis. The experimental results obtained by the proposed method were compared with those based on the FFT algorithm.

Original languageEnglish (US)
Pages (from-to)116-124
Number of pages9
JournalJournal of Manufacturing Science and Engineering, Transactions of the ASME
Issue number2
StatePublished - May 1989
Externally publishedYes

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering

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