It has long been accepted that condition-based maintenance is the most effective and costefficient approach to maximize the life of industrial machinery. Vibration analysis in particular is becoming increasingly popular as a predictive maintenance tool and it serves as a support for machinery maintenance decisions. As a general rule, machines do not break down or fail without some form of warning, which can be indicated by increasing of vibration leveL By measuring and analyzing the vibration of a machine, it is possible to determine both the nature and severity of the defect and hence predict the machine's failure. The overall vibration signal of a machine is originated from different machine parts and nearby machines to which it may be coupled. However, different mechanical defects produce characteristic vibrations at different frequencies, which can be related to specific machine fault conditions. By analyzing the vibration signals time and frequency domains and using signal processing techniques, both the defects and natural frequencies of the various structural components can be identified. Diesel engines are a common source of power, both for vehicles and for static equipment as they are fuel efficient, robust and reliable. It is important that diesel engines run in correct conditions and be properly controlled in order to maintain efficiency, low pollution and high reliability. The cooling system has a key role in diesel engines. This system has the task of removing the generated heat. In water cooled engines, like that considered here, combustion heat is dissipated to water circulated by a pump around the engine through radiator. Radiator is rather weak against vibrations; therefore it must be isolated from the sources of vibration. In regard to its key role in diesel engines, considering vibration monitoring of radiator as part of a condition monitoring program for a diesel engine can provide more reliable information and brings significant cost benefits. In this paper, unexpected damage and leakage of the radiator of a diesel engine is studied. The aim is to give the vibration measured values and analysis at different locations of a locomotive in order to find the reasons of radiator leakage. For comparison some measurements are carried out in two locomotives. The measured values include velocity and acceleration in unloaded (idle) and loaded (notch 8) conditions in three directions. According to measured values of vibration and considering standard ISO 10816-6, the engine of faulty locomotive is not running smoothly. This conclusion can also be achieved by comparing the vibration of the engines in the faulty locomotive and healthy locomotive at similar locations and operating conditions. Gear mesh frequency can be seen in the frequency spectrum of the faulty unit. According to the measurements and analysis it can be concluded that the faulty gear needs to be replaced.
Vibration analysis of a locomotive to diagnose the radiator leakage
Schwingungsanalyse einer Lokomotive zur Diagnose einer Kühlerleckage
2004
8 Seiten, 5 Bilder, 3 Tabellen, 4 Quellen
Aufsatz (Konferenz)
Englisch
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