Re: Bicycle physics question

On 6/25/2024 11:24 AM, Jeff Liebermann wrote:

On Tue, 25 Jun 2024 15:01:29 GMT, Tom Kunich <cyclintom@yahoo.com>
wrote:
 

On Tue Jun 25 09:02:14 2024 Zen Cycle  wrote:

On 6/24/2024 8:41 PM, Frank Krygowski wrote:

On 6/24/2024 12:19 PM, Tom Kunich wrote:

>
A mechanical engineer designs and constructs mechanisms.

>
Wow. Such simplistic ignorance! But then, how would you know?
>
Read at least a little bit about the field:
https://www.mtu.edu/mechanical/engineering/
>
>
>

>
Our lead ME just completed a CFD analysis for some different valve
designs we're considering for a vapor recovery solution to be used at
fuel depots. I'd say that's a bit more complex than 'designs and
constructs mechanisms'.
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And again Dopey shows that he cannot read or understand the English language.

 And once again, Tom demonstrates that he is overly simplistic,
technically ignorant, out of touch with the latest technology and is
unwilling to lookup an acronym with Google or DuckDuckGo search.  The
following might help:
 ME = Mechanical Engineer
<https://en.wikipedia.org/wiki/Mechanical_engineering>
 CFD = Computational Fluid Dynamics
<https://en.wikipedia.org/wiki/Computational_fluid_dynamics>
I'll admit that I know very little about CFD, but at least I'm still
learning.
 Vapor Recovery
<https://ww2.arb.ca.gov/our-work/programs/vapor-recovery>
 Mechanical Engineers that work in the machine design field usually
don't build what they design (unless it's a model).  It's easier,
faster and less messy to run a computer simulation.  Even with 3D
Modeling, it's done by someone else.
<https://www.google.com/search?q=mechanical+engineering+simulation+software&tbm=isch>
 For bicycles, that would be FEA (Finite Element Analysis):
<https://www.sheldonbrown.com/rinard/fea.htm>
 "Bike Frame Structural Analysis with FEA"  (46:52)
<https://www.youtube.com/watch?v=Uk9Nu3Wuh3s>
 BikeCAD:
<https://www.bikecad.ca>

Correct Jeff.
The fluid dynamic simulation is critical before we pull the trigger on molds that run in the $70K to $100K range. The fuel compartments are filled at up to 1000 GPM, and in many depots 2-3 compartments are filled at the same time, but only one vapor recovery plenum is mounted on the truck. This means that the vapor recovery coupler needs to be able to handle the equivalent of 3000 vapor gallons/min though a 4" pipe obstructed by a valve mechanism. There is a 'positive' vacuum in the system, but that's only to ensure no venting during the coupling/uncoupling process.
Since vapor is compressible, this has implications of pressure buildup on the installed vapor recovery piping and the the pressure relief valves. Can't have the relief valves 'burping' - they are monitored and over pressure conditions will set off alarms in the system.
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