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Critical and Barred Range on an Engine?

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  • Critical and Barred Range on an Engine?

    Main engine has critical and barred range....What are they? Can someone explain.

  • #2
    Hi abhishek : This is where the Speed of an Engine in rpm, at which the resonant condition occurs, and is referred to as Critical Speed.
    The high stresses associated with resonant condition start to build up as Critical Speed is approached and do not come back to a safe value until speed is beyond Critical Speed. The unsafe stresses either side of Critical Speed are known as Flank Stresses, this is known as the Barred Speed Range.
    The Engine must not be continuously operated at speeds within the Barred Range.

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