**Author details**

22 Performance Evaluation of Bearings

**Figure 11.** Variation of load capacity with speed for Oil 3 at eccentricity ratio=0.7 and speed=3000 *rpm*

**Figure 12.** Variation of power loss with speed for Oil 3 at eccentricity ratio=0.7 and speed=3000 *rpm* for

This chapter deals with the thermal studies related to offset-halves and elliptical journal bearings. For each bearing configuration, the use of grade Oil 2 gives, the minimum temperature rise, and power losses which implies that the oil with low viscosity should be preferred as compared to high viscosity oil from thermal point of view and temperature rise is low for offset-halves bearing. An attempt has been made to compare the performance of two bearing configurations namely: offset-halves and elliptical journal bearings of same geometrical size by using three common commercial grade oils under similar operating conditions. Further, load carrying capacity of elliptical journal bearing has been found high in comparison to offset-halves journal bearing for same operating conditions. Among the two bearing configurations power losses are found to be minimum in case of offset-halves journal bearing. The chapter presents different performance parameters like oil film temperature, thermal pressures, load carrying capacity, and power losses which will help the designer to design this type of non-circular journal bearings as well as analyze their

*m* , *Cm* = 120

*<sup>m</sup>* , *<sup>o</sup> <sup>T</sup> <sup>=</sup>*<sup>33</sup> <sup>0</sup>

*C* )

*m* , *Cm* = 120

*<sup>m</sup>* , *<sup>o</sup> <sup>T</sup> <sup>=</sup>*<sup>33</sup> <sup>0</sup>

*C* )

for offset-halves and elliptical profile bearings (d= 0.1 *m* , l/d=1, *C =* 200

offset-halves and elliptical profile bearings (d= 0.1 *m* , l/d=1, *C =* 200

**4. Conclusion** 

Amit Chauhan *University Institute of Engineering and Technology, Sector-25, Panjab University, Chandigarh, India* 

Rakesh Sehgal *Department of Mechanical Engineering, NIT Hamirpur (HP), India* 
