A mission synthesis algorithm for fatigue damage analysis

Shahrum Abdullah, J. A. Giacomin, J. R. Yates

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

This paper presents a signal processing based algorithm, the Mildly Nonstationary Mission Synthesis (MNMS), which produces a short mission signal from long records of experimental data. The algorithm uses the discrete Fourier transform, orthogonal wavelet transform and bump reinsertion procedures. In order to observe the algorithm effectiveness a fatigue damage case study was performed for a vehicle lower suspension arm using signals containing tensile and compressive preloading. The mission synthesis results were compared to the original road data in terms of both the global signal statistics and the fatigue damage variation as a function of compression ratio. Three bump reinsertion methods were used and evaluated. The methods differed in the manner in which bumps (shock events) from different wavelet groups (frequency bands) were synchronized during the reinsertion process. One method, based on time-synchronized section reinsertion, produced the best results in terms of mission signal kurtosis, crest factor, root-mean-square level and power spectral density. For improved algorithm performance, bump selection was identified as the main control parameter requiring optimization.

Original languageEnglish
Pages (from-to)243-258
Number of pages16
JournalProceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
Volume218
Issue number3
DOIs
Publication statusPublished - Mar 2004
Externally publishedYes

Fingerprint

Fatigue damage
Power spectral density
Discrete Fourier transforms
Wavelet transforms
Frequency bands
Signal processing
Statistics

Keywords

  • Bumps
  • Compression
  • Fatigue
  • Mission
  • Non-stationary
  • Vehicles

ASJC Scopus subject areas

  • Mechanical Engineering
  • Automotive Engineering

Cite this

A mission synthesis algorithm for fatigue damage analysis. / Abdullah, Shahrum; Giacomin, J. A.; Yates, J. R.

In: Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, Vol. 218, No. 3, 03.2004, p. 243-258.

Research output: Contribution to journalArticle

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