Human reliability analysis on high-speed train dispatcher based on THERP and markov theories

In the dispatching system of high-speed railway, the dispatching terminal equipment is used by dispatchers who manage the running high-speed trains and related production activities, so reliability of dispatchers is directly related to the safety of high-speed trains. In this paper, THERP theory is introduced from nuclear plant industry to calculate the failure rate and the corresponding confidence intervals of dispatchers under static conditions, combining with the characteristics of their job content. According to the Markov chain theory, then the probability state transferring equations is established to study law of the dispatcher reliability under a certain influencing factor, by Laplace transform. Finally, the task about setting train speed limitation done by the dispatcher is taken for an example to analyze the static and dynamic reliability, when the person is under the influence of different level of pressure. The results show that human error rate about setting train speed limitation is lowest with 0.0104 under medium pressure state. ©, 2014, Science Press. All right reserved.