Question 422General Subjects - 1st Asst/Chief70% to pass
While examining vibration analysis of a particular piece of rotating machinery, one of the measurement location readings exhibits high amplitude/displacement in vertical and horizontal direction at 2 X RPM frequency. What would this indicate?
AI Explanation
The correct answer is D) Misalignment.
A vibration reading that exhibits high amplitude/displacement in both the vertical and horizontal directions at 2X the RPM frequency typically indicates a misalignment issue with the rotating machinery. Misalignment causes increased cyclic stresses on the bearings, resulting in high vibration at twice the rotational speed.
The other options are incorrect because a bearing problem would typically show vibration at 1X RPM, an imbalance would show higher vibration at 1X RPM, and a bad belt drive issue would likely exhibit vibration at the belt pass frequency, not 2X RPM.
Related Questions
#420 When reviewing results of vibration analysis, vibration at a bearing occurs at the same frequency as the motor rpm, with a displacement in the radial direction that is twice that of the axial direction. Which of the following could this indicate? #421 When measuring vibration, an engineer should be concerned with recording the velocity or displacement of the measurement. Which other factor should also be of concern?