Why is there a sharp edge in time-displacement plot in rayleigh damping test?

02 February 2017 0 7K Report

I have tested a model using rayleigh damp and with a static step which creates a 6 unit deflection before setting the situation to a free vibration. yet there is a sharp edge in some cases of tests, not all of them, what is this and how can i solve it?

worth noting that number of incerements in all test are equal yet some produce this sharp edge

and my initial displacement is 6 units, some tests show 6, some show less, 5 or 4.5 even, why does that happen?

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