The result from 1800 rpm which is below the blade flutter
instability speed shows that the cutting deviation is small, compared with the results from conducting cuts at 2800 rpm which is above the instability speed of the blades.
Some examples of local oscillations on the other hand are represented by the blade flutter
and the blade excitation due to rotor-stator interaction or to vortex shedding or cavitation oscillations.
GURNAM SINGH, for their paper "Identification of the Stability Margin Between Safe Operation and the Onset of Blade Flutter
What this means: Fluid-structure interaction (FSI) problems are complex physics problems that run rampant throughout automotive design (e.g., flow-induced vibrations in moving vehicles, fan blade flutter
, passenger compartment ventilation, and heat transfer conditions).
By placing NSMS sensors around the rotor's circumference, technicians can look at blade flutter
. Since the NSMS sees all of the blades in a stage as they pass by individually, the system gathers data for modal analyses.
However, as the compressor is far away from its design point with large flow incidence angles, continued operation in choke can result in blade flutter
and high cycle blade metal fatigue failure for some compressor models.