Research On Consistency Evaluation Of Software Development And Safety Standard Requirement For Rail Transit Signal System

In order to determine whether the software development process of the rail transit signal system conformed to the corresponding safety standards,it is necessary to select an effective and reliable method to evaluate.At present,human assessment can not reach zero missions,take more time and cost,and there is a subjective tendency in the evaluation process.To solve this problem,this thesis studies rail transit signal system software development and safety standards for consistency assessment combined with the weighted factor analysis method.The main works are as follows:Firstly,improve the weighted factor analysis method.Introduce the binary concepts,the results are limited to true or false,allowed exist the unknown value factors,improved the interface relationship system definition.Gave the detailed definition from the grammar,framework and other aspects,made the binary analysis standardized,provided an intuitive and simple method to assess all the factors in the project.User can understand the meaning of the graphics and find the conclusions more accurately.Secondly,combine the improved method with the specific project architecture closely,sort out the project safety assessment documents(including interface files).According to EN50128-2011 standard for the software life cycle related requirements,built the system of binary weighted factor analysis framework.In order to improve the efficiency and reliability,design the algorithmic auxiliary program tool.Finally,the results are compared by comparing the different results of the system consistency assessment.The auxiliary calculation program designed according to the binary weighted factor analysis method could traverse the whole system and realize the automatic conformity assessment of the software development system and related standard requirements.It could analyze the fault tolerance of the system through specific cases,and distinguish the factors that affect the overall goal and the factors that have less influence on the target in the specific project system.In the case of lack of manpower,use the tool to carry out the evaluation results automatically,which improved the problem of relying too much on the human assessment,which has practical significance.