Final answer:
A polar plot for a journal bearing can be effectively represented by plotting Bearing Pressure vs. Eccentricity. This plot shows the relationship between the distribution of pressure around the bearing and the eccentricity ratio, which is key to bearing performance analysis.
Step-by-step explanation:
To make a polar plot for a journal bearing, one would typically plot parameters that are relevant to the operation of the bearing and the characteristics of its performance. Among the options listed, the most suitable polar plot would be Bearing Pressure vs. Eccentricity (Option C). This type of plot can illustrate the distribution of pressure around the bearing as a function of the eccentricity, which is the offset between the center of the journal and the center of the bearing.
The eccentricity ratio is a critical parameter in bearing analysis as it helps to determine the bearing's performance characteristics such as load capacity, film thickness, and the attitude angle. By plotting bearing pressure against eccentricity, engineers can visualize and analyze the operating conditions and identify the safe working limits of the bearing.
It is important to note that a journal bearing's performance is also affected by other factors such as lubricant viscosity, rotational speed, and the load applied to the bearing. However, these parameters are not typically represented in a polar plot but might be plotted in other types of graphs or charts.