About application of NURBS to monitoring of operational risk of long distance pipelines

作     者：A.S. Galakhar 

作者机构：The School of Computer-driven Systems of Manufacturing Automation Faculty of Robotics and Integrated Automation Bauman Moscow State Technical University bldg. 5 2-nd Baumanskaya St. Moscow 105005 Russia 

出 版 物：《Journal of Physics: Conference Series》 

年 卷 期：2018年第1141卷第1期

学科分类：07[理学] 0702[理学-物理学] 

摘      要：The system of monitoring of operational risk of long distance pipelines requires determining the actual safety factor in real time for instant evaluation of accident risk. The actual safety factor of a pipeline section is determined for not only technical condition of pipes in the section which is assessed using data of periodic inspections, but also for actual distribution of pressure of pipeline transported medium. Degradation results in slow change of pipeline technical condition. Therefore, the actual safety factor of the operated pipeline depends mainly on loads exerted on the pipe, particularly the load from internal pressure which depends not only on the inlet pressure of the pipeline section, but also on the terrain where the pipeline lies, the actual position of the pipeline in the area and the actual varying conditions of heat transfer from the transported medium to surrounding environment through the pipeline wall. The actual pressure distribution in the pipeline section is determined from the differential equation of motion of the transported medium, which is solved using non-uniform rational B-splines (NURBS) and the data of real time temperature measurements.