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Initial energy not equal to total energy

Altair Forum User

Dear all

I have created a model, which has an intial velocity 1252mm/s to impact on a plate. And the impact object mass is 147.7 Kg.

In my opinion the intial energy is 0.5*147.7Kg*(1252mm/s)^2 =115814.416 J

But when I plot the energy in hypergraph, the energy is about 277717 J . I don't know why they are different. I have uploaded the model I used.

could you help me? Thanks!

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Altair Forum User

Hi,

Total energy is a sum of internal energy ,kinetic energy, contact energy, etc... Can you plot only the IE and KE and check?

I am unable to plot the curve as my version doesn't support your files,

Altair Forum User

Hi,

Total energy is a sum of internal energy ,kinetic energy, contact energy, etc... Can you plot only the IE and KE and check?

I am unable to plot the curve as my version doesn't support your files,

Yes, I plot KE and IE,

due to conservation of energy, the total energy should match with initial kinetic energy.

but the result shows they are not match. I don't know why?<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

Hi,

I think I am missing something.

Imagine you are doing a drop test. By virtue of its height you have PE at T=0.

Now when the object falls on the ground you will KE and the PE will be. Here PE is converted to KE (assuming there are no other forms of energy).

Altair Forum User

Hi,

Total energy is a sum of internal energy ,kinetic energy, contact energy, etc... Can you plot only the IE and KE and check?

I am unable to plot the curve as my version doesn't support your files,

yes, I made a drop test. In order to increase analysis time, I added an initial velocity to the object. but the energy is same.

The question is that the energy is not match with output energy.why?

Altair Forum User

Hi,

Add Gravity and calculate the intial PE and compare

Altair Forum User

Hi,

Add Gravity and calculate the intial PE and compare

hi,

I added gravity, but the result is not reasonable. It shows that the total energy increased and the internal energy increased from 0.

<?xml version="1.0" encoding="UTF-8"?>