The most conventional inspection method for aerial wire ropes - track or haulage or both - is visual inspection, which for obvious reasons cannot evaluate the inner damage such as that caused by corrosion. Moreover, it is hard and nearly impossible to review thoroughly a rope covered by lubricant and grime when a rope length is up to a hundred metres. Additionally, only surface faults of the rope can be detected and this is insufficient to define its condition correctly. Visual inspection alone cannot provide a real definition of the rope degradation level. Using the magnetic method, the rope condition can be evaluated conveniently and convincingly. The principle of operation for electromagnetic non-destructive evaluation of wire rope systems employ: measurements of fringe fields near the surface of the rope to detect local defects such as broken wires, corrosion pitting, local wear; measurements of changes in magnetic flux passing through a short length of rope to quantify changes in metallic crosssection. Magnetic non-destructive evaluation of wire ropes has been in regular use in a number of countries for more than fifty years. Presently used equipment/method is based on magnetisation of the rope with permanent magnets and detection of the changes of magnetic field around the rope and total magnetic flux. The output of the study will be useful for continuous monitoring of rope condition of aerial ropes in ropeway installations. Periodic in situ measurement of faults in ropes would help to establish the effects of various parameters on rope life. It also emphasises the priorities of wire break discard criteria supported theoretically and experimentally. The present non-destructive study on haulage ropes does not include the aspect of fatigue which may develop in ropes in course of time. With the results and recommendations of the study, it will be possible for management to make a decision either to remove the ropes in use from the installation or to extend the life of existing ropes.
Non-destructive evaluation of haulage ropes in mono-cable aerial ropeways. A comparative case study
Zerstörungsfreie Bewertung von Zugseilen von Luftseilbahnen mit Einzelseil. Eine vergleichende Untersuchung
Insight ; 49 , 11 ; 660-664
2007
5 Seiten, 8 Bilder, 2 Tabellen, 14 Quellen
Article (Journal)
English
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