REPORT1.pdf - BACKGROUND Condition monitoring is state of...

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BACKGROUND Condition monitoring is state of the art in many kinds of industrial processes. During long-ago decades, people have often used their ears or screwdrivers as a pick-up sensor of the vibration and noise while the machine was in operation. Typical modern condition monitoring systems consist of a number of sensors and a data acquisition system, integrated with a software program, which analyzes the signals. Robust on-line monitoring and predictive maintenance technology is used to detect impending problems in machines and allow repairs to be scheduled. To keep machines functioning at optimal levels, detection of failures in their vital components (e.g. shafts and bearings) is important because any wear, if it is not detected in time, will often progress to more serious damage affecting the other parts of the machine. Modern rotating machines are fatigue loaded machines and operational experience with these machines manifested that their components are failing at abrupt high rates. Rotating machinery components that are subject to repeated bending may develop cracks which eventually make the component break. Metal fatigue is a well- known problem in many industries. A historical example is the huge German Growian machine (100 m rotor diameter) which had to be taken out of service after less than three weeks of initial operation. To run slow speed rotating machines at optimal levels in efficient industrial processes, enhancements of reliability and lifetime of the machines will be essential. This has led engineers and scientists to develop online condition monitoring schemes and fault detection technologies for early forewarning of incipient mechanical and electrical faults. Reliable and robust monitoring systems can lead to planned corrective maintenance actions before complete component failure occurs, thereby minimizing collateral damage to adjacent components. Planned maintenance can cover all preventive maintenance, including routine checks, periodic maintenance, periodic testing, and high voltage equipment maintenance. Hence, if a condition monitoring programme is successfully implemented it will allow the machine to operate to its full capacity without having to halt the machine at fixed periods for inspection
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