lecture-19 journal bearings - NPTel - Indian Institute of Technology ...
lecture-19 journal bearings - NPTel - Indian Institute of Technology ...
lecture-19 journal bearings - NPTel - Indian Institute of Technology ...
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Machine Design II Pr<strong>of</strong>. K.Gopinath & Pr<strong>of</strong>. M.M.Mayuram<br />
Viscosity <strong>of</strong> SAE 40 at 65 o C, μ = 30 mPa.s = 30x10 -3 Ns/m 2<br />
(a)<br />
<strong>Indian</strong> <strong>Institute</strong> <strong>of</strong> <strong>Technology</strong> Madras<br />
2 2�<br />
�3<br />
�<br />
4<br />
�μn��r� 30 x10 x16 � 0.075 �<br />
f� 2π� �� � � 2π � ��<br />
��0.0134<br />
� p ��c� � 44x10 ��0.00012<br />
�<br />
Fig.2.3a Viscosity – temperature curves <strong>of</strong> SAE graded oils<br />
(b) Friction Torque Tf = f F r = 0.0134 x 8000 x 0.075 = 8.067 Nm<br />
ω = 2πn /60 = 2 x 3.14 x 960 / 60 = 100.48 rad/s<br />
Power loss: Nloss = Tf ω = 8.067 x 100.48 = 811 W