Campbell diagram and is its applicaion

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Discussion Overview

The discussion revolves around the concept of the Campbell diagram, its definition, and its applications, particularly in the context of vibration characteristics and resonance phenomena. Participants explore its interpretation and relevance in various scenarios, including engine cylinder analysis and rotor dynamics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks clarification on the definition of a Campbell diagram, suggesting it illustrates the relationship between exciting frequencies and natural frequencies, particularly in resonance contexts.
  • Another participant references the Wikipedia page on Campbell diagrams, prompting others to specify their questions or doubts.
  • A participant expresses understanding of the Campbell diagram as a plot comparing vibration characteristics with excitation frequencies but struggles to interpret a specific diagram from an attached extract.
  • Discussion includes a description of how the Campbell diagram shows curves representing frequency variations with shaft RPM and highlights the significance of intersection points between these curves and the rotation speed line.
  • One participant questions how to determine the number of engine cylinders using the Campbell diagram related to intake orifice noise, indicating a practical application of the concept.
  • A participant mentions having a question related to an attached file, suggesting additional context or details may be necessary for further discussion.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and interpretation of the Campbell diagram, with some seeking clarification while others provide insights. The discussion remains unresolved regarding specific applications and interpretations.

Contextual Notes

Some participants reference specific diagrams and extracts that may not be universally accessible, potentially limiting the clarity of the discussion. There are also indications of varying interpretations of the Campbell diagram's utility in different contexts.

svishal03
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Please again a fundamental question.

Can anyone explain what is a Campbell diagram and its application?

IS it a plot/comparison between exciting frequencies and natural frequencies mainly illustrating when responance will occur?

Please help and elaborate above
 
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Yes, I have and I understand that:

“Campbell diagram is a plot of the vibration characteristics of the structure compared with the excitation frequencies”

However, I have been reading the attached extract and was not able to interprate the diagram with respect to it. It (the attached extract) might not require any background. will be grateful if helped.
 

Attachments

The diagrams in the wiki link have curves showing how the frequency of the different modes varies with the shaft RPM, and the intersection points where the "rotation speed" line crosses the curves.

Your diagram doesn't show the curves, it just shows the intersection points with the speed line.

For a simple rotor (like the Wiki example) you can recognise the shapes of the curves as forwards and reverse whirl modes of the rotor. For a turbine wheel like your example, there isn't usually any obvious "pattern" to the curves and they can intersect each other, so plotting all the curves just makes the diagram look more complicated without adding any useful information.
 
Hi Guys,I have some doubts about how can we find number of engine cylinder with the help of campbell diagram of the intake orifice noise?
can anyone please help me
 
actullay my question is in the attached file
 

Attachments

  • campbell.png
    campbell.png
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