Good Morning from Harbin Institute of Technology(HIT) of China, [[ I am a foreigner though ]]
I am trying to understand how to interpret output from a normalized input force-time curve.
My purpose: to get the displacement and stress over the model or at a point when this curve is applied as an input.
Load_Set: the load set have vertical and horizontal forces of like 5e6 N etc...point is really huge forces. plus very high torques.
What I am doing: I did a modal analyses as required and it went pretty well. (output is mass-normalized), then I tried a Dynamic-Time analyses(damping coefficient is 4%) with this function I mentioned above.
Below is the function and the result I got.
Problem: I previously did a static analyses and it gave displacements like ~15 mm. static analyses won't have the damping effect of the dampers as far as I understand but in dynamic analyses it will. I did test on a small subject and it showed the damping effect when the material is set correctly. I think its so obvious for a sane mind that with that huge forces and torques that much small output for displacement is impossible..I once measured stress and it was like 0.2 Mpa. Is it because of the input curve? also can I use the impulse function to get the results, I mean will it be OK?(highly doubt it will be, but I am not sure). I am new to this field and trying to learn. Please do help me out here, Please tell me what I am missing or what I am doing wrong.
Why I am doing this: I need to know the displacement and acceleration, maybe from acceleration I can obtain the damped forces. I need these damped forces to design the power-screw drive which controls the motion of the coils. It can't be design without knowing the damped forces because the Maximum load for the spindle depends on that.
PS: That force in the function is sure normalized as u can see. As in Chinese they say 峰值归一化的力. I attached a paper about this system( not related to my field) just to show this is a real thing.
