18-10-2010, 12:16 PM
This article is presented by:
Connection Technology Center, Inc.
590 Fishers Station Drive
Victor, New York 14564
Industrial Vibration Analysis
for
Predictive Maintenance and Improved Machine Reliability
for
Predictive Maintenance and Improved Machine Reliability
Background:
Industrial vibration analysis is a measurement tool used to identify, predict, and prevent failures in rotating machinery. Implementing vibration analysis on the machines will improve the reliability of the machines and lead to better machine efficiency and reduced down time eliminating mechanical or electrical failures. Vibration analysis programs are used throughout industry world wide to identify faults in machinery, plan machinery repairs, and keep machinery functioning for as long as possible without failure.
Machines:
Typical machines include motors, pumps, fans, gear boxes, compressors, turbines, conveyors, rollers, engines, and machine tools that have rotational elements. The rotating elements of these machines generate vibrations at specific frequencies that identify the rotating elements. The amplitude of the vibration indicates the performance or quality of machine. An increase in the vibration amplitude is a direct result of failing rotational elements such as bearings or gears. Based on the machine speed, the rotational frequencies can be calculated and compared to the measurements to identify the failure mode.
Industrial Vibration Sensors:
The practice of Vibration Analysis does require the measurement and analysis of rotating machines utilizing different vibration sensors (accelerometers, velocity transducers, or displacement probes). The most common sensor used in industry is the accelerometer. Accelerometers are case mounted using a permanent bolt or portable magnet to hold them in place. They will measure the vibration of the machine and output a voltage or current proportional to the vibration and relative to a “g” level (unit of gravitational pull). This signal can also be integrated to provide a measured output of velocity (inches/second or mm/second). It is very important to choose the correct accelerometer, cable, connector, and mounting method for each application. This will provide quality measurements and accurate vibration data for identifying faults in rotating machinery. Sleeve bearing applications require displacement probes to measure the actual movement of the shaft inside the sleeve bearing.
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