Myths and Truths about Balancing

March 28, 2011

MYTH: “1x RPM is always caused by unbalance.” TRUTH: Unbalance always causes vibration at 1x RPM.  However, 1 x RPM is not always caused by unbalance.  Many other problems can exhibit vibration at this frequency.  Examples are:  Misalignment, Bent shaft, bowed shaft, cracked shaft, eccentricity, open rotor bars in the motor, rubs, looseness, belt issues  […]

Myths and Truths about Vibration Analysis

March 21, 2011

MYTH: “It is acceptable to use a stinger attached to the vibration sensor.” TRUTH: Stingers can be attached and used with most vibration sensors. However, stingers are the least desirable method to mount the sensor to the equipment. Stingers reduce the frequency range that can be measured with the attached sensor. Also, it is very difficult to […]

Finally, ISO Guidelines for Condition Monitoring

March 14, 2011

March 2011 • WindPower Engineering Condition-monitoring systems have made it clear that wind turbines are complex machines in which overall vibration values must be systematically determined and evaluation references made available. Points to consider when writing evaluation guidelines for wind-power plants include: • Function and structural design of wind turbines and their components • Interaction […]