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Considering a rotor run-up, the rotor typically becomes unstable (first bifurcation) already at low rotor speeds and reaches a stable limit cycle (1. Subsynchronous).
However, the semi-circular wind rotor runs more smoothly.
Several examples, including a practical one dealing with a complex rotor running on non-linear bearings, conclude the work.
The experimentation points out the destabilizing effect of the internal friction in the over-critical rotor running.
The case of a torsionally stiff rotor running with a given law ω(t) is studied in detail.
Finally, experimental investigations are performed on a test rig composed of an asymmetric rotor running on nonisotropic supports.
Since the rotor runs at its operating point, the contact forces are also evaluated at nominal speed.
In the more general case of an unsymmetric rotor running on an unsymmetric supporting structure, a series solution is sought for the equation of motion.
In the rotation tests, rotor runs stably with small vibration amplitude, which is dominant in waterfall plot during whole speed up procedure.
Spectral analysis of response to periodic multiple axial impulses shows the presence of rotor bending natural frequency as well as side bands around impulse excitation frequency and its harmonics due to modulations caused by rotor running frequency.
Logs showed the helicopter underwent so-called "rotors running" checks.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com