Residual life prediction of marine EPR cable under discontinuous operation

Abstract

It is known that marine cable is responsible for the transmission of electric energy and electrical signals of the ship. In order to predict the residual life of cable under discontinuous operation, a non‐destructive online life prediction model is established based on retention rate of hardness (RRH). This study takes the marine ethylene propylene rubber (EPR) cable as the research object. Using time temperature superposition principle, the optimal time temperature shift factor is calculated using particle swarm optimisation and steepest descent method. After that the main curve was fitted exponentially to acquire the relationship between RRH and ageing time. Compared with the existing model, the results indicate that the proposed model has higher prediction accuracy. On this basis, the residual life prediction model based on RRH of marine EPR under discontinuous operation is presented by adding time parameters. The effectiveness of the method is verified by simulation. Thus, it provides theoretical guidance for solving the problem of marine cable replacement time.

Experimental study on ageing characteristics of electric locomotive ethylene propylene rubber cable under mechanical–thermal combined action

“…Therefore, for the train-mounted EPR cable in the bent state, it is simultaneously subjected to the combined ageing of mechanical stress and thermal stress during service. Up to now, studies on the ageing state of EPR cables have mainly focussed on the ageing problem of single stress factor [8][9][10]. However, it should be pointed out that the ageing mechanism and law under multiple stresses are significantly different from that under single stress.…”