Introduction Vibration analysis is one of the most effective methods in condition monitoring. Many of faults and defects can be distinguished using vibration analysis technique. Knowing the machine geometry, specifying the measuring points, frequency range setting, and having technical knowledge for diagnostics are of the most important parameters in machinery fault detection. Many of faults…
introduction Condition monitoring is growing coincident with growing industries. Electrical motors are the most common machines which are used in different industries. So monitoring of these machines can be effective enough in decreasing maintenance expenditures. The most common electromotors used in different industries are squirrel cage induction electromotors. In the last two decades, different diagnostics…
introduction Gears are of the most common power transmitter in industries. Due to the issues which may be resulted from shocks and stresses in gearboxes, these equipment are exposed to special failures. In some cases too many gears are used in a gearbox which cannot be diagnosed easily. A vibration analyst needs to know about…
introduction Bearings are parts of equipment through which all produced forces in machinery passed. Therefore bearings are the first parts in machinery that are exposed to failures. Theoretically, a bearing has a life time of 100 years but practically this period reduced to 10 years in the best condition. To achieve this period, it’s necessary…
introduction Unbalanced rotor is one of the main reasons of vibration in rotating machinery. In order to achieve the minimum amplitude of vibration, the amount of unbalance weight should approaches to the minimum. Balancing is one of those activities which has to be done on the rotor or any other rotary parts before the assembly…
introduction As you are aware, measuring vibration data from a shaft is feasible in multiple ways: 1- Measuring shaft relative vibration 2- Measuring shaft absolute vibration 3- Measuring bearing absolute vibration In ordinary vibration measurements from machinery, absolute data is collected from bearing housing. This is acceptable when the distance from casing to bearing is…
Introduction Acoustic emission is a phenomenon which happens due to creating and propagation of an elastic wave in ultrasonic range. Although acoustic emission is an ancient technique, it is not widely used in industries. This technique can effectively help us for early detection of faults specially in roller element bearings. Acoustic emission wave can be…