ABSTRACT
This chapter explores the more widely used condition-based maintenance (CBM) techniques: vibration analysis, infrared thermography, precision lubrication and oil analysis, ultrasonic surveys, and nondestructive testing. The purpose of vibration analysis within the predictive maintenance context is to determine the machine's health while it is operating. The vibration spectrum is an amplitude versus frequency graph, making possible the identification of complex machinery vibration. Spectral vibration analysis is capable of detecting many faults at fairly early stages in their development and without disrupting machine operation. Machines depend on proper lubrication to reduce frictional forces, which otherwise shorten the asset life cycle. Ultrasound provides data that encourages maintenance teams to shift from calendar-based lubrication tasks to on-condition scheduling. It warns when friction levels elevate above an acceptable baseline, and it guides as just the right amount of grease is applied and levels return to normal.
