Vibration – Quality Auditing in Condition Based Maintenance

Let’s get a bit technical today. Have you heard about Vibration – Quality Auditing in Condition Based Maintenance ? No worries here it is the article.

This article is by Dr G (Dr. Abdul Ghaffar Bin Abdul Rahman)

Individual machine components are generally dynamically well designed and rigorously tested. However, when these machines are assembled together their dynamic characteristics changed causing unexpected behaviour of the system. There is a shift in the natural frequencies. Procedures in condition based maintenance (CBM) scheme generally assumed that machine degeneration are caused by wear and tear during operation. However, a considerable percentage of machines have been installed and commissioned with inherent design flaws. Quality Auditing incorporates the concept of Dynamic design verification (DDV) in CBM procedure to eliminate or minimize design flaws during installation. Hence, it reduces the condition monitoring task to merely trending and diagnosis of machine degeneration due to operations alone. DDV combines advanced measurement techniques of dynamic signatures and computational mechanics, namely:

ODS used to determine:

  • Deflection of the structure during operation.
  • Actual vibration values

Modal Analysis used to determine:

  • Resonance points
  • Modes of vibration
  • Damping

Finite Element Analysis finally used to:

  • Perform virtual structural modification to fulfill dynamic design criteria

If you need further info I would suggest you go to this great site of Dr. G:

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