Silindirik makaralı rulmanlarda elastohidrodinamik film kalınlığının teorik olarak incelenmesi
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Date
2019-11-07
Authors
Aksu, Hatice
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Publisher
Bursa Uludağ Üniversitesi
Abstract
Bu tezde aynı boyuttaki silindirik makaralı rulman için, 3 farklı malzeme kombinasyonunda 3 farklı yük altında eliptik temas ve dikdörtgen temas yöntemleriyle boyutsuz film parametreleri ve minimum film kalınlıkları hesaplanmıştır. Eliptik temas yöntemi ve dikdörtgen temas metodu arasında karşılaştırmalar yapılmıştır. Malzemeden bağımsız olarak eliptik temas yöntemine göre elde edilen sonuçlara göre, yük yaklaşık 2 kat artırıldığında hesaplanan minimum film kalınlığı iç bilezik-makara temasında yaklaşık %5,18 dış bilezik-makara temasında yaklaşık %5 oranında azalmaktadır. Dikdörtgen temas yönteminde ise iç bilezik-makara %8,5 ve dış bilezik-makara teması film kalınlığında %7,3 azalmaktadır.Yük 2,5 kat artırıldığında hesaplanan minimum film kalınlığı iç bilezik-makara temasında yaklaşık %6,2 dış bilezik-makara temasında yaklaşık %6,5 oranında azalmaktadır. Dikdörtgen temas yönteminde ise iç bilezikmakara %11 ve dış bilezik-makara teması film kalınlığında %8,5 azalmaktadır. Malzeme kombinasyonundan bağımsız olarak, eliptik temas ve dikdörtgensel temas yöntemine göre, iç temas yüzeyindeki boyutsuz film parametresi dış temas yüzeyindekinden yaklaşık % 21 küçük bulunmuştur.
In this thesis, dimensionless film parameters and minimum film thicknesses were calculated by using elliptical contact and rectangular contact methods under 3 different material combinations in 3 different material combinations for cylindrical roller bearing of the same size. Comparisons were made between the elliptical contact method and the rectangular contact method. According to the results obtained according to the elliptical contact method independent of the material, the calculated minimum film thickness decreases by approximately 5,18% in the inner ring-roller contact when the load is increased by 2 times, and by 5% in the outer ring-roller contact. In the rectangular contact method, inner ring-pulley and outer ring-pulley contact decreased by 8.5% and 7.3% in film thickness. When the load is increased by 2.5 times, the calculated minimum film thickness decreases by approximately 6.2% at the inner ring-to-roller contact and by approximately 6.5% at the outer ring-to-roller contact. In the rectangular contact method, inner ring-spool 11% and outer ring-spool contact decreased by 8.5% in film thickness. Regardless of the combination of materials, according to the elliptical and rectangular contact method, the dimensionless film parameter on the iner contact surface was about 21% smaller than on the outer contact surface.
In this thesis, dimensionless film parameters and minimum film thicknesses were calculated by using elliptical contact and rectangular contact methods under 3 different material combinations in 3 different material combinations for cylindrical roller bearing of the same size. Comparisons were made between the elliptical contact method and the rectangular contact method. According to the results obtained according to the elliptical contact method independent of the material, the calculated minimum film thickness decreases by approximately 5,18% in the inner ring-roller contact when the load is increased by 2 times, and by 5% in the outer ring-roller contact. In the rectangular contact method, inner ring-pulley and outer ring-pulley contact decreased by 8.5% and 7.3% in film thickness. When the load is increased by 2.5 times, the calculated minimum film thickness decreases by approximately 6.2% at the inner ring-to-roller contact and by approximately 6.5% at the outer ring-to-roller contact. In the rectangular contact method, inner ring-spool 11% and outer ring-spool contact decreased by 8.5% in film thickness. Regardless of the combination of materials, according to the elliptical and rectangular contact method, the dimensionless film parameter on the iner contact surface was about 21% smaller than on the outer contact surface.
Description
Keywords
Silindirik makaralı rulmanlar, Cylindrical roller bearings, Elastohidrodinamik yağlama, Film kalınlığı, Elastohydrodinamic lubrication, Film thickness
Citation
Aksu, H. (2019) .Silindirik makaralı rulmanlarda elastohidrodinamik film kalınlığının teorik olarak incelenmesi. Yayınlanmamış yüksek lisans tezi. Bursa Uludağ Üniversitesi Fen Bilimleri Enstitüsü.