اثرات بهينه سازي RAM زيرساخت انتقال نوري راه‌آهن در كاهش مسدودي خط

Impact of the Optimization the RAM of the Railway Optical Transmission Infrastructure on Reducing the Line Blockage

ﺳﯿﺮ و ﺣﺮﮐﺖ اﯾﻤﻦ آﻻت ﻧﺎﻗﻠﻪ رﯾﻠﯽ ﺑﺪون ﺳﯿﺴﺘﻢﻫﺎي ﮐﻨﺘﺮل ﻗﻄﺎر اﻣﮑﺎنﭘﺬﯾﺮ ﻧﻤﯽﺑﺎﺷﺪ. ﺳﯿﺴﺘﻢﻫﺎي ﮐﻨﺘﺮل ﻗﻄﺎر در ﺣﻤﻞ و ﻧﻘﻞ رﯾﻠﯽ ﻣﺘﻀﻤﻦ اﯾﻤﻨﯽ ﻫﺴﺘﻨﺪ و در اﻓﺰاﯾﺶ ﺳﺮﻋﺖ و ﻇﺮﻓﯿﺖ ﺣﻤﻞ و ﻧﻘﻞ ﻧﻘﺶ ﺣﯿﺎﺗﯽ اﯾﻔﺎ ﻣﯽﮐﻨﻨﺪ، ﺑﻪﻃﻮري ﮐﻪ از ﮐﺎر اﻓﺘﺎدن ﮐﻞ و ﯾﺎ ﺑﺨﺸﯽ از آن ﻣﯽﺗﻮاﻧﺪ ﻣﻮﺟﺐ اﺧﺘﻼل اﯾﻤﻨﯽ، ﮐﺎﻫﺶ ﺑﻬﺮهوري و اﻓﺰاﯾﺶ ﻣﺴﺪودي ﺧﻂ ﮔﺮدد. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ اﯾﻨﮑﻪ ﮐﻠﯿﻪ ﺳﺮوﯾﺲﻫﺎي ﻣﺨﺎﺑﺮاﺗﯽ ﮐﻨﺘﺮل ﻗﻄﺎر ﺑﺮ ﺑﺴﺘﺮ ﺷﺒﮑﻪﻫﺎي اﻧﺘﻘﺎل ﻧﻮري ﻫﺴﺘﻨﺪ، ﻗﻄﻊ ﺷﺪن اﯾﻦ ﺷﺒﮑﻪﻫﺎ ﻣﻮﺟﺐ ﻗﻄﻊ ﺷﺪن ﮐﻠﯿﻪ ﺳﺮوﯾﺲﻫﺎي ﮐﻨﺘﺮل ﻗﻄﺎر و در ﻧﺘﯿﺠﻪ ﻣﺴﺪودي ﺧﻂ ﻣﯽﮔﺮدد. ﻟﺬا، ارﺗﻘﺎي ﭘﺎﯾﺪاري زﯾﺮﺳﺎﺧﺖ اﻧﺘﻘﺎل ﻧﻮري ﺑﺴﯿﺎر ﺿﺮوري ﻣﯽﺑﺎﺷﺪ. در اﯾﻦ ﺗﺤﻘﯿﻖ، ﺑﻪﻣﻨﻈﻮر ﭘﯿﺶﺑﯿﻨﯽ ﺗﻌﺪاد ﻣﺴﺪودي ﺑﺮ اﺛﺮ ﻗﻄﻌﯽ زﯾﺮﺳﺎﺧﺖ اﻧﺘﻘﺎل، در دو ﻣﺮﺣﻠﻪ ﺑﻪ ﺑﺮرﺳﯽ ﺷﺒﮑﻪ اﻧﺘﻘﺎل ﻧﻮري رﯾﻠﯽ ﭘﺮداﺧﺘﻪ ﻣﯽﺷﻮد. در ﻣﺮﺣﻠﻪ ﻧﺨﺴﺖ، ﭘﺎراﻣﺘﺮﻫﺎي Availability ،Reliability و RAM) Maintainability( ﺷﺒﮑﻪ اﻧﺘﻘﺎل ﻧﻮري راهآﻫﻦ، ارزﯾﺎﺑﯽ ﺷﺪه و رﻓﺘﺎر ﺷﺒﮑﻪ، از ﻃﺮﯾﻖ ﻣﺘﺪ ﻣﻮﻧﺖ ﮐﺎرﻟﻮ ﺷﺒﯿﻪﺳﺎزي و ﺗﺤﻠﯿﻞ ﻣﯽﺷﻮد. در ﻣﺮﺣﻠﻪ دوم ﺗﺤﻘﯿﻖ، ﺑﺎ ﭘﯿﺎدهﺳﺎزي ﻣﺪل ﮐﺎﻫﺶ زﻣﺎن ﺗﻌﻤﯿﺮ ﺧﺮاﺑﯽ ﺷﺒﮑﻪ، ﻣﺠﺪداً ﻣﮑﺎﻧﯿﺰم RAM ﻣﺤﺎﺳﺒﻪ و ﺷﺒﯿﻪﺳﺎزي ﻣﯽﺷﻮد. در ﻫﺮ دو ﻣﺮﺣﻠﻪ، اﺣﺘﻤﺎل ﺧﺎﻣﻮﺷﯽ ﺷﺒﮑﻪ ﻣﺨﺎﺑﺮاﺗﯽ راهآﻫﻦ و ﺗﻌﺪاد ﻣﺴﺪودي ﺧﻂ ﺑﻪدﺳﺖ آﻣﺪه اﺳﺖ. ﭘﯿﺶﺑﯿﻨﯽ ﺗﻌﺪاد ﺧﺎﻣﻮﺷﯽﻫﺎي ﺷﺒﮑﻪ و ﻣﺴﺪودﯾﺖ ﺧﻄﻮط راهآﻫﻦ ﺑﻪ دﻟﯿﻞ ﻗﻄﻊ ﺳﺮوﯾﺲﻫﺎي ﮐﻨﺘﺮل ﻗﻄﺎر ﺑﺮاي ﻧﺨﺴﺘﯿﻦ ﺑﺎر ﺑﻪ ﺻﻮرت ﻓﻌﺎﻟﯿﺖ ﺗﺤﻘﯿﻘﺎﺗﯽ اﻧﺠﺎم ﺷﺪه اﺳﺖ. ﻧﺘﺎﯾﺞ اﯾﻦ ﺗﺤﻘﯿﻖ ﻧﺸﺎن داد ﮐﻪ ﮐﺎﻫﺶ 10 درﺻﺪي زﻣﺎن ﺗﻌﻤﯿﺮ ﺷﺒﮑﻪ ﻣﻨﺠﺮ ﺑﻪ اﻓﺰاﯾﺶ 3/5 ﺑﺮاﺑﺮي ﺳﻄﻮح ﻣﮑﺎﻧﯿﺰم RAM و ﮐﺎﻫﺶ 70 درﺻﺪي ﻣﺴﺪودي ﺧﻂ ﮔﺮدﯾﺪ. اﯾﻦ ﻧﺘﺎﯾﺞ ارزش ﺑﺴﯿﺎر زﯾﺎدي در اﻓﺰاﯾﺶ ﺑﻬﺮهوري ﺳﯿﺴﺘﻢ و ﻧﯿﺰ رﺿﺎﯾﺘﻤﻨﺪي ﮐﺎرﺑﺮان ﺧﻮاﻫﺪ داﺷﺖ.

The safe movement of the rail rolling stock is not possible without train control systems. Train control systems ensure safety somehow and they play a vital role in increasing the speed and the capacity of the transport; So that, the failure of the whole or part of it can cause safety disruption, reduce productivity and increase line blockage. Due to the fact that all train control telecommunication services are based on optical transmission networks, the interruption of these networks will cause the interruption of all train control services and as a result, the line will be blocked. Therefore, evaluating and improving the sustainability of the optical transmission infrastructure is essential. In this research, in order to predict the number of the blockages due to the disruption of the transmission infrastructure, the rail transmission network is evaluated in two stages. In the first stage, the parameters of Availability, Reliability and Maintenance (RAM) of the railway transmission network are evaluated, and are simulated using the Monte Carlo method. In the second phase, the RAM mechanism is simulated again by implementing a network failure repair reduction model. In both stages, the probability of the shutdown of the railway telecommunication network, the numbers of blocked lines have been obtained. Predicting the number of network outages and rail line blockages due to the interruption of train control services has been conducted for the first time in research. The results of this study showed that a 10% reduction in network repair time led to a three-and-a-half-fold increase in RAM levels and a 70% reduction in line blockage. These results will be of great value in increasing system efficiency as well as the satisfaction of the users.