I am simulating random vibration in optistruct. I have input psd in (m/s^2)/Hz, model content in mm, output required is stress in MPa. I submitted 1 run and i am getting high stress(RMS stress over frequencies) which are not realistic. Unit excitation is 9810 (SPCD) and I have submitted another run with unit excitation 1 (SPCD), here i am getting very low stress which is not realistic. Can you suggest me the right procedure. I guess i have mistake in unit conversion. If anyone having dummy procedure file please share me.
and one more my stresses should not be higher than endurance limit (criteria). Stresses whatever i am checking is the right one to compare with endurance limit ??
Note: Earlier i used to do in abaqus. recently we purchased altair software and trying to simulate in optistruct. Please help me. Your suggestion is very valuable to us.
Please call me if possible. here is my number 9019717355
Thanks you in advance