Understanding Order in Sound Plots in Automotive Industry

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SUMMARY

The discussion centers on the concept of "order" in sound plots within the automotive industry, specifically relating to resonators for engines. The term "order" refers to multiples of a fundamental frequency, typically linked to engine speed, where a second order vibration indicates a frequency of 2X the engine speed. This classification is crucial in vibration analysis, as it helps identify the source of vibrations, with first order vibrations (1E) indicating shaft imbalance. A recommended resource for further understanding is the Vibrate Software page on engine speed-related diagnostics.

PREREQUISITES
  • Understanding of fundamental frequency in vibration analysis
  • Familiarity with engine speed metrics in automotive engineering
  • Knowledge of vibration analysis techniques
  • Basic concepts of resonators and their function in engines
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  • Research "vibration analysis techniques for automotive applications"
  • Explore "fundamental frequency and its multiples in mechanical systems"
  • Learn about "shaft imbalance detection methods in engines"
  • Review the "Vibrate Software engine diagnostics tools"
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Automotive engineers, vibration analysts, and professionals involved in engine design and diagnostics will benefit from this discussion, particularly those focused on sound and vibration management in automotive applications.

CuriousWon
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I work in the automotive industry and some of the products we make are resonators for engines. I always hear talk about "order" (2nd order, 4th order, etc) in sound plots. What are they referring too? Is there a good site out there that can give me the basics?
 
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It somewhat depends on the usage in your particular field. In most cases I have seen, the order refers to a multiple of a fundamental frequency. In your case that would probably be the once per rev engine speed. So a second order vibration would be a vibration with a frequency of 2X of engine speed. In the vibration analysis world, the order of the vibration is a first indicator of a source for the vibration. For example, a first order (or as I am used to saying, a 1E) is a very good indication of a shaft imbalance.

I found this page related to automotive engines that probably will give you what you need.

http://www.vibratesoftware.com/html_help/html/Diagnosis/Engine_Speed_Related.htm
 
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