Damped vs undamped frequencies in Campbell
Category: Linearisation & Campbell diagram
Problem
When you look at the Campbell diagram in data view, which of the frequency values is displayed? Is it damped or undamped?
Solution
It is the undamped frequency that is displayed in the Campbell viewer. Damped frequencies are also available in the output groups of the Campbell diagram calculation.
For details of how the damped and undamped frequencies are calculated from the linearised system matrices, see section "Calculating Coupled Modes" in the Theory Manual (section 11.2 in the 4.9 edition).
Keywords Campbell; frequency; damped; undamped