| Interlocking test is the last critical step to ensure the normal operation of railway signal system and plays significant roles in railway transportation safety.With the development of railway signal interlocking equipment,the test methods and contents become more complex.The risk of failure in interlocking tests increases in the courses of major rehabilitation of signal equipment,local retrofitting of stations,and assessment of new railway lines.It is essential to reduce the risk of engineering tests via improving the asset management.This thesis aims to reduce the risk of interlocking tests through optimizing the test management.There are three primary tasks:（1）The risks in the tests of railway signal systems were identified and analyzed through a thorough literature review on the risk evaluation,analysis,and management for the interlocking tests and through analyzing the documentation of the interlocking systems of a realistic station.（2）An evaluation model was established for the tests of interlocking equipment of the national railway signal system through a hierarchical analysis framework for the tests of interlocking equipment based on the AHP approach.The risk factors in the model were quantified through the evaluation of assessment matrix and computation of the weights of the risk indices.Modified fishbone diagrams were obtained,and the management strategies were presented to reduce the risks of engineering tests of the interlocking equipment of national railway signal systems,considering the management factors,documentation factors,method factors,human factors,and environment factors.（3）Case studies of a total of four stations were conducted,including two retrofitted stations with the same manufacturer of the interlocking equipment and two new stations with different manufacturers of interlocking equipment.In each case study,the existing management strategy and the optimized strategy were respectively applied to evaluate the feasibility and the efficacy of the optimized strategy through comparing the quantity and the severity of the subsequent problems in different cases.The results showed that the proposed optimization approach was able to effectively control the various risks in interlocking tests. |
