Nonlinear modeling and vibration analysis of horizontal drum type washing machines

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Bilimleri Enstitüsü, Türkiye

Tezin Onay Tarihi: 2019

Tezin Dili: İngilizce

Öğrenci: CEM BAYKAL

Asıl Danışman (Eş Danışmanlı Tezler İçin): Yiğit Yazıcıoğlu

Eş Danışman: Ender Ciğeroğlu

Özet:

Nonlinear two and three-dimensional dynamical models for horizontal drum type washing machines are developed considering rotating unbalance type excitation. Nonlinear differential equations of motion are converted into a set of nonlinear algebraic equations by using the Harmonic Balance Method (HBM). The resulting nonlinear algebraic equations are solved by using Newton’s method with arc-length continuation. Several case studies are performed in order to observe the effects of orientation angles of springs and dampers between the drum and the cabinet. In order to reduce the steady-state vibration amplitude of the drum, suitable orientation angles of the springs and dampers and their implementation locations are identified. Furthermore, to further reduce the vibration amplitude of the drum at high frequencies, instead of viscous dampers, dry friction dampers are installed in the system. Effects of orientation angles and parameters of the dry friction damper and springs on the force transmitted to the cabinet are studied.