Design and construction of an interferometric setup for dynamic measurement of clearances inside plain bearings

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Makina Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2017

Öğrenci: ATAE JAFARI TABRIZI

Danışman: ZAFER DURSUNKAYA

Özet:

In this work with the help of fiber optic interferometry an experimental framework is designed and constructed to dynamically measure micron-level clearances inside main journal bearing of an engine crankshaft, and the trajectory of its shaft. For this purpose, the crankshaft is rotated at lower speeds than its operating speeds. An electric motor is used to rotate the crankshaft, and there are no pistons and connecting rods connected to the crankpins. Measured clearances from multiple points of the bearing are used to generate an estimate of the trajectory that the journal follows during a cycle. Experiments are performed both with and without lubricant inside bearing. Effect of lubricant, different rotating speeds, and repeatability of the measurement and estimation procedures are all investigated.