Abstract
An experimental investigation on the vibrational behavior of a rotating disk by means of three optical fiber sensors is presented. The disk, which is a scale model of the real disk of an aircraft engine, was assembled in a wind tunnel in order to simulate real operation conditions. The pressure difference between the upstream and downstream sides of the disk causes an airflow that might force the disk to vibrate. To characterize this vibration, a set of parameters was determined by measuring the tip clearance of the disk: the amplitude, the frequency and the number of nodal diameters in the disk. All this information allowed the design of an upgraded prototype of the disk, whose performance was also characterized by the same method. An optical system was employed for the measurements, in combination with a strain gauge mounted on the disk surface, which served to confirm the results obtained. The data of the strain gauge coincided closely with those provided by the optical fiber sensors, thus demonstrating the suitability of this innovative technique to evaluate the vibrational behavior of rotating disks.
Highlights
The operation of multiple devices, such as computer hard disks or circular saws, is based on rotating disks [1]
We report on our evaluation works related to the vibrational behavior of a rotating disk that is a scale model of a real disk of an aircraft engine
We developed a sensor for it that was based on a bundle of optical fibers, which served to carry out tip-clearance (TC) measurements in low pressure turbines [13] and compressors [14] of aircraft engines
Summary
The operation of multiple devices, such as computer hard disks or circular saws, is based on rotating disks [1]. We report on our evaluation works related to the vibrational behavior of a rotating disk that is a scale model of a real disk of an aircraft engine Such evaluation was carried out by means of a non-contact method employing three optical fiber sensors (OFSs) [6,7]. To characterize the vibrational behavior of our special rotating disk, we decided to employ three OFSs, because, as a matter of fact, the distance from the edges of a rotating disk to the casing of a wind tunnel can be interpreted as a clearance that varies as a result of disk vibrations This method based on three OFSs provided a great reduction in the time needed to get the system ready to start the tests in comparison to a system based only on strain gauges.
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