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RustyCas

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Reply with quote  #16 
Geez, if I'd ever seen anything like that, I might have paid attention in the "vibration" course I took back in college!  Great job.  Sounds like you put a lot of thought and effort into it.  And thanks for sharing the results with us.
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JuddJones

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Reply with quote  #17 
The kids were lucky to have someone who cared enough to go to that effort! Great Job!!
Vibe-Rater

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Reply with quote  #18 
Amazing effort.  Ditto Big Al.  If I had seen this so young I would have definitely gone in this direction.  Instead I sort of fell into it. rgds
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Reply with quote  #19 
Hopefully this is not a bad place to post this.  Very old vibration prints. Got them from eBay a few years ago.  Shows at least that back in time others knew about what we do. Not sure if this came from practical experiments or theory. rgds  edit: suposedly over 125 years old. 

 
Attached Files
pdf OldVibrationPrints1of3.pdf (939.60 KB, 21 views)
pdf OldVibrationPrints2of3.pdf (711.85 KB, 11 views)
pdf OldVibrationPrints3of3.pdf (924.01 KB, 11 views)

Curran919

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Reply with quote  #20 
Quote:
Originally Posted by Vibe-Rater
Hopefully this is not a bad place to post this.  Very old vibration prints. Got them from eBay a few years ago.  Shows at least that back in time others knew about what we do. Not sure if this came from practical experiments or theory. rgds  edit: suposedly over 125 years old. 


I unearthed a binder from the 50's recently in a retiree's old desk. It was their original workbook where they hand sketched all of the eigenmodes of compressor blades. Hundreds of them. Very neat. I've been meaning to scan some pages and post them on here.
Vibe-Rater

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Reply with quote  #21 
That would be a treasure to see. As an aside I have several copies of early edition Den Hartog (thanks eBay) and every now and then flick through one. It really does amaze me where all the stuff I ended up basing my career on started. One of the earliest stories I like to believe but don't know if true or not is that during ww2 submarines would do fft on sounds received underwater to figure out shaft rotational speeds and with knowledge of number of blades could figure out friend or foe... Sounds reasonable but you know..  Like to see these things confirmed rather than me recollecting retold stories. Any comments from anyone?? rgds.
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Reply with quote  #22 
Quote:
Originally Posted by Curran919


I unearthed a binder from the 50's recently in a retiree's old desk. It was their original workbook where they hand sketched all of the eigenmodes of compressor blades. Hundreds of them. Very neat. I've been meaning to scan some pages and post them on here.
please scan them, please.  And there are some framed prints of the vibration scans I posted earlier available on eBay if anyone is interested. I gues a bit expensive to send with frames. but hey. rgds
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