NDLI: Forced response of rotating bladed disks: Blade Tip-Timing measurements

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Forced response of rotating bladed disks: Blade Tip-Timing measurements

Content Provider	Semantic Scholar
Author	Torino, P. D. Battiatoa, G. Firrone, C. M. Berruti, T. M.
Abstract	The Blade Tip-Timing is a well-known non-contact measurement technique for the identification of the dynamic properties of rotating bladed disks. Even if it is an industry-standard technique its reliability has to be proved for different operation conditions by the comparison with other well established measurement techniques. Typically the strain gauges in conjunction with a radio telemetry is used as reference. This paper aims at evaluating the accuracy of a last generation Tip-Timing system on two bladed dummy disks characterized by different geometrical, structural and dynamical properties. Both the disks were tested into a spinning rig where a fixed number of permanent magnets, equally spaced around the casing, excites a synchronous vibrations with respect to the rotor speed. A new set up of the optical sensors was adopted for the Tip-Timing system. Due to the presence of shrouds, it was avoided that the probes look radially inward at the blade tips as in the most common configurations. The probes are optical laser sensors pointing at the leading and trailing edges locations where the blade experiences the greatest magnitude of displacement. Besides the typical Blade Tip-Timing application aimed at identifying the dynamical properties of each blade, an original method is here proposed to identify the operative deflection shape of the disk by experimentally observing ∗Corresponding author Email address: giuseppe.battiato@polito.it (G. Battiato) Preprint submitted to Journal of LTEX Templates March 20, 2016 the nodal diameters. The method is applicable when a small mistuning pattern perturbs the ideal cyclic symmetry of a bladed disk.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://iris.polito.it/retrieve/handle/11583/2657038/133136/Manuscript_Forced%20response%20of%20rotating%20bladed%20disks_BTT%20measurements.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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