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I have confused the definition of "gravity vector scale factor"(G) which is a parameter in the GRAV card. It's that mean the gravitational acceleration in kg/s^2 or the weight in Newton? Here is a Screenshot. Does anyone have an idea?
gravity is just gravity acceleration (m/s2 or mm/s2 or whatever units you're using).
This is a vector, so it has the magnitude and its components (X, Y and Z multipliers) defining its direction.
So, if G = 9810mm/s2, and you want to make it work in -Z direction, your vector will be N1=0, N2=0 and N3=-1.0
if you want to apply a 4G load in Y+ direction, G=9180mm/s2 and N1=0, N2=4.0 and N3=0.
gravity is just gravity acceleration (m/s2 or mm/s2 or whatever units you're using). This is a vector, so it has the magnitude and its components (X, Y and Z multipliers) defining its direction. So, if G = 9810mm/s2, and you want to make it work in -Z direction, your vector will be N1=0, N2=0 and N3=-1.0 if you want to apply a 4G load in Y+ direction, G=9180mm/s2 and N1=0, N2=4.0 and N3=0.
Adriano, so if the model is in inches (US system), G=386.0885 in/s^2, then for 75G in x+ direction I should use this card:
GRAV 3 1 386.0885 75. 0. 0.
Is it correct?
p.s. For US units (if the density is in lb/in^3) we also add (Nastran type parameter):
PARAM, WTMASS, 0.00259
Thank you!
Vladimir
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