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Dampening formula for animated graph

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Last Modified: 2020-04-04
Here's a fun little graph:

https://enex.net/topshef/dev/20200223/sds_graph.php?config_file=./data/working/NQJ.SDS.graph_config.live.txt

Nodes animate according to some physical attraction/repulsion rules, and a linear dampening on speed which is not strictly realistic and also results in a perpetual oscillation in some cases such as above.

Can anyone suggest a simple modification to the dampening that will remove this oscillation? Also why is the oscillation perpetual if there is dampening?

JS code is visible by viewing source.

Many thanks
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