Public Places Safety Management Evaluation of Railway Stations

AbstractWith more and more attentions paid to safety problems in public places by the whole society, preventions and controls of unexpected events in the crowded places of railway stations are especially important. Aimed at the safety problems in railway station, such as crowded people, complex environment, weak management and so on, in order to make the public places safety management of railway stations more effective, through analysis of public places system safety features and hidden dangers of railway stations, public places safety management evaluation indicators system is constructed and aimed at every specific indicator. Corresponding safety management and control requirements are put forward. Taking Xi’an Railway Station as the example, Analytic Hierarchy Process (AHP) is used to get indicators weight values. Public places safety main control factor is obtained by analysis. According to the evaluation results, aimed at the weak links in safety management, improvement measures are put forward, supplying an important basis of perfect safety management system and improvement of safety management

Research on grading control of mine ventilation system

In view of problem that present mine ventilation system control had not been considered from overall perspective of ventilation system, a grading control method of mine ventilation system was proposed based on structure of mine ventilation system and air volume distribution characteristics. Firstly, deviation value of ventilation condition parameters of each ventilation location is obtained by comparing real-time acquisition value and safety setting value of the ventilation condition parameters. Then the deviation value is online adjusted and modified by use of automatic correction controller, which is transmitted to PID controller to obtain ventilation condition adjustment parameters. At last, frequency converter of main fan power supply module, electric air door and air-filled air bag at the end of compressed air pipeline are respectively controlled by intelligent control module according to the ventilation condition adjustment parameters, so as to realize dynamic adjustment of air volume at three levels, which are air volume control of whole mine, air volume control of mining area and air volume control of working face. The control method meets requirements of sequential, systematic and coherent regulation of air volume in ventilation system