At 11:41 AM 9/10/2000 -0700, you wrote:
>
>Also, GE makes gas turbine engines -- which have serious problems with
>parasitic oscillations in turbine blades.
The reality is that all steam and gas turbines, regardless of manufacturer,
are susceptible to catastrophic blade failure due to harmonic vibrations.
The failure mode appears to be better understood than parasitic
oscillations being debated in amplifiers but in a similar fashion, not
completely understood. Despite that understanding, turbine engineers are
still at best only able to predict (ie. educated guess) whether a blade
will fail. For example, with a 98% confidence level, they can say that a
new blade in the LPT section of a GE LM6000 gas turbine will destroy itself
either within the first 100 hours of operation, or sometime after the next
10,000 hours of operation if it survives the first 100 hrs. But they don't
completely know why this is. Nor can they tell which single blade out of
300 identical blades in a stage will fail.
GE has no franchise on this trouble. All the turbine manufacturers face
similar difficulties.
Phil
(I have no affiliation with GE)
>Denial of reality is a dangerous human malady. It almost cost Bill the
>Presidency. It's likely to cost George W. in November.
>>...
>cheers, Perry
>
>- Rich..., 805.386.3734, www.vcnet.com/measures.
>end
>
>
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>
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