By R. A. Collacott B.Sc. (Eng), Ph.D., C.Eng., F.I.Mech.E., F.I.Mar.E. (auth.)
Although the main subtle fault prognosis and situation tracking structures have their foundation within the aerospace and nuclear power industries, their use is in no way limited to such components of 'high technology'. glossy equipment in so much business crops is now so advanced and costly that mechanics locate it increas ingly tough to become aware of failure by way of, for example, recognising adjustments in sound 'signatures', and few crops can have the funds for the posh of standard 'stripping down'. more and more, for that reason, eady-warning units are being hired in order to hinder catastrophic breakdown. This ebook presents the 1st co-ordinated compilation of fault prognosis and con dition tracking units. It proceeds in 3 logical steps. The eady chapters take care of these stipulations which give a contribution to deterioration and the resultant most likely improvement of faults. the center a part of the publication considers many of the tech niques of tracking and discusses the factors for his or her choice in numerous situ ations. the ultimate chapters offer a consultant to the translation of the knowledge indications deriving from tracking, on the subject of reliability technological know-how and the maths of likelihood, and hence delivering choice facts on which administration can act.
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Additional info for Mechanical Fault Diagnosis and condition monitoring
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3 Cavitation The collapse of minute vapour bubbles involving impingement and associated chemical or electro-chemical surface activity is the cause of cavitation failure. The surface becomes extensively pitted sometimes with a honeycomb pattern. Fatigue cracks are likely to develop from these surface pits. Cavitation is likely to occur in hydraulic machinery under circumstances in which changes of velocity cause associated changes in the pressure of the working fluid . Cavitation damages a wide range of engineering components - ship's propellors and rudders, the waterside of diesel engine cylinder liners, plain bearings, fuel-injection systems, pumps and hydraulic systems.
2) Scuffing: an activity in which the mating surfaces come into contact when ideal hydrodynamic lubrication cannot be maintained under sliding conditions. This is a cumulative process which can lead to catastrophic failure by seizure in the case of plain bearings, or to excessive wear by the formation of work-hardened material in the case of piston rings or cylinder bores. The phenomenon is difficult to elucidate owing to accumulative action obliterating its initial stages. Compatibility of materials in contact and the effect of surface treatments and lubricants can be most important for example in gears and bearings.