Re: G-Factor Reference
G is the ratio of maximum angular screen acceleration to gravitational acceleration (refer any mechanical engineering handbook) - and is useful to gauge the speed - throw relationship, and the amount of stress placed on the mechanical and structural components.
The formula can also be expressed as:
G = throw (mm) x (pi x rpm/30)^2 / 9807 x 2 ■
Re: G-Factor Reference
Thelaz
John's formula is correct - if you do not want to recalculate G force everytime I can forward a graph to you - relationship between stroke, acceleration and rpm.
regards
Ziggy Gregory
www.vibfem.com.au ■
Re: G-Factor Reference
Suspect the origin is Simple Harmonic Motion, have a look at the following:
http://hyperphysics.phy-astr.gsu.edu/hbase/shm.html
y=Asin(wt)
y'=Awcos(wt)
y''=-Aw^2sin(wt)
sin(wt) varies between -1 to 1.
Hence y" (max) =(+/-) Aw^2
y'' = acceleration (double derivative of displacement / time)
Regards,
Lyle ■
Re: G-Factor Reference
Thanks very much, all
i will try to devour the information you have sent through.
Kindest regards ■
G Force Cheat Sheet
I used to use this when travelling around checking G FORCE or speed stroke on vibrating screens in the field. Enjoy...
George Baker MODERATOR
Attachments
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G-Factor
Dear Mr. John,
Iwill be greatfull if you elaborate on the following.
1. What is pi in the formula.
2. Little details of angular acceleration & gravitational acceleration.
3. RPM of what?
Regards.
A.Banerjee ■
Re: G-Factor Reference
Banerjee
pi = 3.14
angular acceleration = (2pi x rpm/60)
rpm of the running screen
regards
Ziggy ■
Re: G-Factor Reference
Dear Ziggy, Banerjee
Angular acceleration is by definition: d(omega)/dt
omega = angular rotation speed in radians/second
angular rotation speed = 2*pi * rpm/60 in radians/sec
in which:
pi = 3.141593
angular acceleration is the change in rotation speed/time
BR
teus ■
Teus
G-Factor reference
Good day all.
I'm Seeking a reference for an equation I've been using for my vibrating screens
I obtained the equation off this forum, but never traced its origin.
G = stoke (mm) x RPM^2 / 1778000
The screens are inclined with linear stroke.
Any help??
Regards
Thelaz ■