In Problem 12–21, assume the journal has reached its equilibrium position under the specified steady load and journal speed. If the load is suddenly removed entirely, describe and explain the...

In Problem 12–21, assume the journal has reached its equilibrium position under the specified steady load and journal speed. If the load is suddenly removed entirely, describe and explain the resulting journal orbit.

Problem 12–21

Consider a journal bearing of length 25 mm, diameter 50 mm, and radial clearance 25 µm. The dynamic viscosity of the lubricant is 7 mPa × s. In the computing reference frame of Figure 12–34, the journal is rotating at a constant angular velocity of 200 rad/s, and the sleeve is fixed. At time t = 0, the journal is initially positioned with journal eccentricity ratio components
 At time
, a steady load with components
,
 is applied to the journal.

Figure 12-34