Atom Jet with applied EVG
Moderator: Mike Everman
Re: Atom Jet with applied EVG
Here are the tones you sent me for recording, hope they are ok. Phil.
Re: Atom Jet with applied EVG
With some luck, should have sound files tonight. Did some plucking of my valve last night and found it to be near 600Hz. The valve still needs some work, and the clamping surfaces also. Will forego the complicated slide system for now.
Used a micrometer to verify that the material is indeed .008" and not .0078". One thing came to mind last night. The sales man at the store I purchased my material mentioned a high carbon steel .008" used by some of the local shops.
Phil, if you have some scrap valve material, could you test it on a bench grinder and check the spark trails? You probably know this, but the sparks for medium carbon steel are long and continuous with only occasional branches. High carbon steel will branch of once, and sometimes twice along its path creating little "starburst" effects.
Apologies that this didn't go as smoothly as I would have liked it to.
Joe
Used a micrometer to verify that the material is indeed .008" and not .0078". One thing came to mind last night. The sales man at the store I purchased my material mentioned a high carbon steel .008" used by some of the local shops.
Phil, if you have some scrap valve material, could you test it on a bench grinder and check the spark trails? You probably know this, but the sparks for medium carbon steel are long and continuous with only occasional branches. High carbon steel will branch of once, and sometimes twice along its path creating little "starburst" effects.
Apologies that this didn't go as smoothly as I would have liked it to.
Joe
Re: Atom Jet with applied EVG
All the fine grinding didn't make much difference. (@ 0.554" [14.07mm])
Sound file is in the .zip file.
Joe
Sound file is in the .zip file.
Joe
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Last edited by PyroJoe on Wed Feb 03, 2010 10:55 pm, edited 1 time in total.
Re: Atom Jet with applied EVG
Hi everyone, my valve material is definately blue tempered spring steel, however after checking thickness again with a different micrometer that has tenths of thou on the scale it shows my material varies in thickness from .0078" to .0081" hope this helps. Phil.
Re: Atom Jet with applied EVG
Hi Forrest,
Here is the drawing of the petal using the point of the petal centered in the retainer.
what is the length of CAD rectangle 1?.5525
what is the width of CAD rectangle 1?.0865
what is the thickness of petal valve?.008
'Continuous beam', partial system frequency
Young's modulus, E: 30000000 lbf/in^2
density: 0.283 lb m/in^3
thickness of beam strip: 0.008 in
width of beam strip: 0.173 in
length of beam strip: 0.5525 in
1st moment of inertia: 0.73813333e-8 in^4
mass per unit length: 0.391672e-3 lbm/in
wl = 5382.94848 rad/sec
fl = 856.72286 Hz
What is the longitudinal distance to the CM of a side lobe?.3215
What is the area of one side lobe?.0283
Lumped mass, partial system frequency
w2 = 7764.06799 rad/sec
f2 = 1235.6898 Hz
System resonant frequency
ws = 4423.73077 rad/sec
fs = 704.058619 Hz
Here is the drawing of the petal using the point of the petal centered in the retainer.
what is the length of CAD rectangle 1?.5525
what is the width of CAD rectangle 1?.0865
what is the thickness of petal valve?.008
'Continuous beam', partial system frequency
Young's modulus, E: 30000000 lbf/in^2
density: 0.283 lb m/in^3
thickness of beam strip: 0.008 in
width of beam strip: 0.173 in
length of beam strip: 0.5525 in
1st moment of inertia: 0.73813333e-8 in^4
mass per unit length: 0.391672e-3 lbm/in
wl = 5382.94848 rad/sec
fl = 856.72286 Hz
What is the longitudinal distance to the CM of a side lobe?.3215
What is the area of one side lobe?.0283
Lumped mass, partial system frequency
w2 = 7764.06799 rad/sec
f2 = 1235.6898 Hz
System resonant frequency
ws = 4423.73077 rad/sec
fs = 704.058619 Hz
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