Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Makina Mühendisliği Bölümü, Türkiye
Tezin Onay Tarihi: 2014
Öğrenci: GÜNEŞ ECE MÜFTÜOĞLU
Danışman: METİN AKKÖK
Özet:In this thesis, different loading cases of four-point contact slewing bearings and load distribution on the balls are investigated. The purpose is to determine that analytical modeling of load and deflections which give more effective results as compared to numerical solutions. In order to have numerical solutions, complex finite element models are needed to be prepared with many assumptions. With analytical method, the solutions can be done with fewer simplifications as compared to FEA models. In order to be able to use analytical model for four-point contact bearings the results of finite element modeling and analytical method for load distribution on the balls are compared with each other for simplified models. Analytical based MATLAB code is generated for analytical calculation and an appropriate finite element analysis model is prepared using the parametric design language (APDL) of a commercial program (ANSYS). At the end, the results of the FEAs are compared with the analytical method for calculating the deflections and load on each ball. It is observed that the results of the FEA model and the MATLAB code are confirmed each other. Therefore it is decided that in the further studies for different slewing bearings, MATLAB model can be used for investigation of load distribution and deflection in bearings. With the result of analytical code, more complex studies are done. Since modeling clearance in FEA is not a practical method because of the convergence issues, the effect of clearance is studied in the analytical model. The change of contact angles due to clearance is also studied with the analytical model. With the created MATLAB model dimensional changes in the bearings are also studied and the effects of different load cases are combined in one solution.