Learning Forum

[mintuboyapati]

Hello,

I am working on space debris capture simulation using nets. I gave the initial velocity generation for the net in the direction of debris, so that I can observe the capture mechanism. The debris is fixed in space so it cannot move. However, the issue is that the net is moving away from the debris, exactly in the direction opposite to whatever i gave it. I fixed the co-ordinate systems, and also tried giving velocity in multiple directions, but no matter what i do, the net keeps moving away from the debris. Does anyone know how to fix this? I am kind of stuck and would appreciate any help. Thank you!

[Vijay]

Hello Mintu,

A general recommendation is to review the kinetic energy (KE) of that part in the matsum file to ensure there are no additional load factors influencing the motion. It’s important to verify whether gravity or any other boundary condition might be contributing to the behavior.
You can also try applying negative velocities to check whether the direction of motion reverses as expected.

Also refer this example, this might help. Bar Impacting a Rigid Wall — Welcome to LS-DYNA Examples

Regards, 

Vijay 

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[mintuboyapati]

Hello vijay, 

Thank you for the response. The suggestion you gave worked. The net is now moving towards the desired direction. The net is going around the debris model and trying to close. but upon the contact with the debris, the net is moving away. It is working like a bouncing effect. 

Do you have any suggestions that will help me to overcome this? Upon contact, i require the net to wrap around the debris and capture it.

I am new to this software so I am trying to figure it out. Thank you for the help! 

[vsukka]

Hello Mintu,

Could you please check the contact force generated at the interface, this may give you idea about whats happening with the model.

Without the specifics of the model, we are limited to the kind of help we can provide here. If you are supported send it to your local partner or open up a support ticket in Ansys ACSS portal.

Thanks,

Vijay Sukka