Mofy
Mechanical
- Jan 1, 2014
- 17
Hi all:
I'm trying to simulate a drop test of a structure from certain height. I entered all information needed for running the simulation. when I looked for the results in history, I found that the C.G. acceleration graph started from zero value. As the drop test is of free fall object type, it should start from -9.81 m/s^2 and continue constant up to the moment when the structure hits the ground. in the assembly I defined the mass at the C.G. of the assembly along with the mass moment of inertia. Also, I fixed the ground on which the structure impacts. I tried to define gravitational acceleration in y direction (negative= downward) but it increased the kinetic energy instead of decreasing it which violated the conversation of energy law.
Can anyone help with how to fix this problem.
Regards,
Mofy
I'm trying to simulate a drop test of a structure from certain height. I entered all information needed for running the simulation. when I looked for the results in history, I found that the C.G. acceleration graph started from zero value. As the drop test is of free fall object type, it should start from -9.81 m/s^2 and continue constant up to the moment when the structure hits the ground. in the assembly I defined the mass at the C.G. of the assembly along with the mass moment of inertia. Also, I fixed the ground on which the structure impacts. I tried to define gravitational acceleration in y direction (negative= downward) but it increased the kinetic energy instead of decreasing it which violated the conversation of energy law.
Can anyone help with how to fix this problem.
Regards,
Mofy