velocity ratio help (1 Viewer)

mattskioner

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Okay so the VR formula for hydraulics systems is D^2/d^2, where D is the output diameter and d is the input diameter. So if you sub the values in, you should get 6.25, which is then rounded to 6.3 (D) :)
 

OkDen

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Okay so the VR formula for hydraulics systems is D^2/d^2, where D is the output diameter and d is the input diameter. So if you sub the values in, you should get 6.25, which is then rounded to 6.3 (D) :)
I'm not an engineering studies student but:

Isn't 6.3 the velocity ratio of a 100% efficient hydraulic system?

So, is it 5.3 = (6.25 * 0.85) ---- (C)
or 6.3 (D)
 
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mattskioner

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I'm not an engineering studies student but:

Isn't 6.3 the velocity ratio of a 100% efficient hydraulic system?

So, is it 5.3 = (6.25 * 0.85) ---- (C)
or 6.3 (D)
It's one of those questions where they give you more information than you need. The formula for efficiency is MA/VR, so if the question asks what is the MA of the system, then it would be C as 6.3 X 85%=~5.3. But it's simply asking for the VR, so it's just D^2/d^2 :)
 

OkDen

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It's one of those questions where they give you more information than you need. The formula for efficiency is MA/VR, so if the question asks what is the MA of the system, then it would be C as 6.3 X 85%=~5.3. But it's simply asking for the VR, so it's just D^2/d^2 :)
ok thx
 

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