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- May 11, 2006
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- 2,443
In reading Don Hessenaur's article on torsional vibration in Contact Magazine he gave some formulas for figuring the torsional spring constant and frequency of torsional vibration. I did these for a steel tube driveshaft with a wooden prop and came up with some numbers but I do not know what they mean.
When I calculated the frequency of torsional vibration for a 1.5 inch diameter steel driveshaft with a wooden prop I had numbers in the hundreds of thousands and when I went to a three inch diameter driveshaft the answer went into the millions. Yet I do not know what these mean. I understand that this is somewhat like flutter where what really matters is the relationship between the parts (flexability of crankshaft, flexability of driveshaft, springiness of prop)and I have tried to get into Hertog's "Mechanical Vibration" but I am having a hard time finding formulas that I can understand.
I have access to a university engineering library with Nestorides and others. Do any of you have a suggestion or some way to make spreadsheet that would work?
When I calculated the frequency of torsional vibration for a 1.5 inch diameter steel driveshaft with a wooden prop I had numbers in the hundreds of thousands and when I went to a three inch diameter driveshaft the answer went into the millions. Yet I do not know what these mean. I understand that this is somewhat like flutter where what really matters is the relationship between the parts (flexability of crankshaft, flexability of driveshaft, springiness of prop)and I have tried to get into Hertog's "Mechanical Vibration" but I am having a hard time finding formulas that I can understand.
I have access to a university engineering library with Nestorides and others. Do any of you have a suggestion or some way to make spreadsheet that would work?
