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ISABE-2005-1220
Noncontact Blade Vibration Measurement System for Aero Engine Application
Michael Zielinski and Gerhard Ziller
MTU Aero Engines GmbH
Engine Control & Testing Division
80995 München, Germany
Abstract e engine order
f vibration frequency
This paper presents the current status of BSSM, a f r rotational speed
noncontact blade vibration measurement system that is n number of node diameters
continuously being evolved at MTU and used on most t, t´ undisturbed and measured time value
of pany'pressor development programs. A plex number
description is first offered of the capacitive sensors used Im imaginary part of plex number
in vibration and tip clearance measurements and then of M, N integers
the electronic hardware, which has meanwhile e Nb blade count
pact and affordable. In-depth attention is
N0 quantity of positive integers incl. zero
focused on analysis techniques for synchronous and R rotor radius
asynchronous vibrations and associated topics like Re real part of plex number
probe positioning, mode identification and conversion δ damping constant
of sensed deflections into stresses. Comparisons are
ϕ phase of excitation force or vibration
made with results from strain gauge measurements and
ψ phase shift at resonance pass
finally the topics of ongoing development efforts are ϑ
cited t