Practical Machinery Vibration Analysis and Predictive MaintenanceElsevier, 2004 M07 16 - 272 pages Machinery Vibration Analysis and Predictive Maintenance provides a detailed examination of the detection, location and diagnosis of faults in rotating and reciprocating machinery using vibration analysis. The basics and underlying physics of vibration signals are first examined. The acquisition and processing of signals is then reviewed followed by a discussion of machinery fault diagnosis using vibration analysis. Hereafter the important issue of rectifying faults that have been identified using vibration analysis is covered. The book also covers the other techniques of predictive maintenance such as oil and particle analysis, ultrasound and infrared thermography. The latest approaches and equipment used together with the latest techniques in vibration analysis emerging from current research are also highlighted.
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Contents
| 1 | |
| 11 | |
| 29 | |
Signal processing applications and representations | 55 |
Machinery fault diagnosis using vibration analysis | 89 |
Correcting faults that cause vibration | 134 |
Oil and particle analysis | 168 |
Other predictive maintenance techniques | 221 |
Exercises | 235 |
Practical sessions | 248 |
Index | 252 |
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Practical Machinery Vibration Analysis and Predictive Maintenance Paresh Girdhar No preview available - 2004 |
Common terms and phrases
acceleration accelerometer additives alignment analyzer angle angular applications axial belt Bode plot calculated cause Cavitation cepstrum components condition contamination critical speed detect determine dial gage displacement dynamic absorber eccentricity Eddy current electrical equipment F-max ferrography filter fluid gear gearbox harmonics high-frequency indicate kcpm leak lubricant machinery magnetic mass measured method microns mils misalignment monitoring motor mounting natural frequency normal occur oil analysis oil sample operating orbit oxidation peak phase difference phase readings photocell plane plot pointer position possible predictive maintenance predictive maintenance techniques probe problems pump radial range resonance rotating rotor running speed sensor shaft shims sidebands signal Spectroscopy spring-mass system stator Steve Mackay stiffness stroboscope Synchronous time averaging temperature thermography transducer trial weight ultrasound unbalance valve vector velocity pickup vibration amplitude vibration analysis vibration levels viscosity voltage wave waveform wear particles
Popular passages
Page 24 - Class I : Individual parts of engines and machines, integrally connected with the complete machine in its normal operating condition. (Production electrical motors of up to 15 kW are typical examples of machines in this category.) Class II : Medium-sized machines, (typically electrical motors with 15 to 75 kW output) without special foundations, rigidly mounted engines or machines (up to 300 kW) on special foundations. Class III : Large prime movers and other large machines with rotating masses mounted...
Page 90 - That condition which exists in a rotor when vibratory force or motion is imparted to its bearings as a result of centrifugal forces.
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Page 193 - List) concerning the need for ensuring that the methods of test are carried out with suitable attention to safetySCOPE 1 . This method gives a measure of the ability of the oil to separate from an emulsion. It is commonly applied to turbine oils, but it may be used for other lubricating oils.
Page 195 - Interfacial Tension is determined by measuring the force necessary to detach a planar ring of platinum wire from the surface of the liquid of higher surface tension, that is, upward from the water-oil interface. To calculate the interfacial tension, the force so measured is corrected by an empirically determined factor which depends upon the force applied, the densities of both oil and water, and the dimensions of the ring.
Page 65 - ... having a frequency equal to the difference between the frequencies of the two instruments.
Page 19 - Figure 11.lb, the total distance travelled by the vibration part from one extreme limit of travel to the other extreme limit of travel is referred to as the ‘peak-to-peak
Page 21 - See vibration acceleration. acceleration of gravity: The acceleration produced by the force of gravity at the surface of the earth. It varies with the latitude and elevation of the point of observation.
Page 228 - On lower voltage systems, a quick scan of bus bars often will pick up a loose connection. Checking junction boxes can reveal arcing. As with leak detection, the closer one gets to the leak site, the louder the signal. If power lines are to be inspected and the signal does not appear to be intense enough to be detectable from the ground, you can use an ultrasonic waveform concentrator (a parabolic reflector), which will double the detection distance of the system and provide pinpoint detection.
Page 224 - Interchangeable modules allow users to adjust for different types of inspection problems. The scanning mode is used to detect ultrasounds that travel in the atmosphere such as a pressure leak or a corona discharge, while the contact mode is used to detect ultrasounds generated within a casing such as in a bearing, pump, valve, or steam trap housing.