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Negative damping in simulink simscape

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Tomorrow
Tomorrow 2019-4-3
I want to realize a negative damping system.
My idea is to use the Variable Translational Damper, however, it doesn't support negtive coeffcient. Its parameter of damping coefficient must be bigger/equal than 0. I tried to switch the R and C connection, intuitively, the damping force would be negative. However, in both cases, the damper still damp the mass vibration as the output figure show.
Are there any other way for a negative damper? thanks.
massdamper.jpg
output.jpg

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