Dear Readers,
We are sharing with you a new article published in the Mechanical Systems and Signal Processing .
This article deals with the determination of the position of probes in the engine casing in a blade tip timing system for blade monitoring.
Abstract
The monitoring of the blades in bladed disk assembly is done via a continuous determination and analysis of the blade dynamics, which is mostly subjected to different types of excitation forces inducing the synchronous and asynchronous vibration of the blades. These vibrations can cause fatigue and crack in the blade, which can damage the overall turbo-machinery. Thus, avoiding such damage motivates the determination of the blade’s vibration. This is done traditionally by the use of strain gauges, which unfortunately monitor only the instrumented blade but not all the blades at the same time. Nowadays, such vibration measurements are done by the Blade Tip Timing (BTT) system, where the arrangement of the probe is extremely important in order to extract useful information about the blade’s vibration signal. Thus, this article proposes a simple approach for the determination of the optimal probe positioning based on the minimization of the coherence of the measurement matrix derived from the mathematical model used to infer the vibration parameters, while the blade exhibits synchronous and asynchronous vibrations.
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