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AN INVESTIGATION TO THE COMBINED EFFECT OF NON-UNIFORM PERMEABILITY AND SHAFT MISALIGNMENT ON THE PERFORMANCE OF POROUS BEARINGS

Author: Lekaa' H. Abd Al-shaheed
Journal: Iraqi journal of mechanical and material engineering المجلة العراقية للهندسة الميكانيكية وهندسة المواد ISSN: 20761819 Year: 2009 Volume: 9 Issue: 1 Pages: 76-89
Publisher: Babylon University جامعة بابل

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Abstract

A porous bearing with misaligned journal and non uniform permeability has been investigated through the present work. The Reynolds' boundary condition has been used to determine the boundary of the effective oil film. Two types of misalignment, axial (vertical displacement) and twisting (horizontal displacement) with different values have been adopted. Two models are considered to analyze a finite porous bearing with misaligned shaft and non uniform permeability. In the first model the permeability a cross the radial direction has been varied, while in the other model the axial permeability has been varied. Effect of different supply pressure and misalignment are investigated for a particular bearing permeability. It was found that there is a slight effect to the supply pressure on the performance parameters of the porous bearing. Varying the permeability in radial and axial direction cause an increase of load carrying capacity with slight increase in coefficient of friction. It is also noticed that the journal misalignment has a considerable effect on the bearing performance.

تضمن هذا البحث دراسة للمساند المقعدية ذاتية التزييت ذات النفاذية المتغيرة والمحور المنحرف. تم استخدام الشرط الحدي لرينولدز لتحديد حدود طبقة الزيت. تم اعتماد نوعين من الانحراف وهما الانحراف المحوري (العمودي) والانحراف ألبرمي. اعتمد نموذجان لدراسة تأثير تغير النفاذية باتجاهي النصف قطري والمحوري للمساند المسامية المحددة الطول والمحور المنحرف . لقد وجد إن لضغط تجهيز الزيت تأثير طفيف على خصائص المساند المسامية, وان الحمل الهيدروديناميكي يزداد بتغير النفاذية باتجاهي النصف قطري والمحوري مع زيادة طفيفة جدا بمعامل الاحتكاك.كذلك تم ملاحظة أن للمحاور المنحرفة تأثير على خصائص المسند.

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