Battery drop test in ANSYS

[Hkn88]

Hello all,

I would like to simulate real drop test in ANSYS environment for my batteries. Basically battery will exhibit "free fall"(no initial velocity) from 1,5 meter height to the concrete floor.

My questions are:

1. Which analysis type i should prefer? Implicit/explicit or transient?

2. Do i need to consider inertia relief for this type of problem? Which analysis type consider this and which one is NOT?

3. Considering 1,5 meter height, it seems to me simulation will take longer hours to solve. What is the correct and easy way to reduce the total simulation time? With and without mass scaling? Is there a way for example to skip duration for 1 meter height without losing any accuracy?

4. In explicit ones, my friend told me that just defining " standart earth gravity" wouldn't simulate the problem and advice to define initial velocity which is very small in order to simulate free fall. Is this correct? Should i define very low inital velocity along with standart earth gravity just for the sake of ticking the box?

Your detailed answers would be very much appreciated.
Many thanks.

 

[L_K]

Please download ANSYS Explicit STR tutorials from their website. You will find drop test tutorials there.

In the tutorials I have seen, the dropped part is initially next to floor and it is given an initial velocity.

 

[IceBreakerSours]

Think carefully about the phenomenon you are trying to capture, what experimental data you have to provide as high-fidelity input and for verification purposes, and what experimental data you have for validation purposes, etc. What sort of physics is relevant for the ultimate question you want the model to answer? What is NOT relevant? What sanity checks should the model pass? .. .. ..

Once you have thought of such higher-level questions, then the simulation strategy can be put in place. Until then, you will get lost by hearsay and details.

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