New approaches towards improving mine ventilation network analysis

Based upon a numerical test approach by computer, the relationship between relevant parameters was investigated based on five complicated mine ventilation systems. These Parameters are: branch number, node number, mesh number, computation accuracy, arbitrary given value of airflow rate, iteration number, computation time, convergence etc, in mine ventilation network analysis, The results show that a high degree of a given computation accuracy significantly influences the iteration number. In particular, when the nominal accuracy attains 10-6 m(3)/s in order to solve a complex mine ventilation network, the running time is far too long even though a high-speed computer is used. The size of the given value of airflow rate has little effect on the iteration number, and any value between 1 and 100 m(3)/s can be set. The structure of a network has also some effect on the iteration number. When the resistance of a branch in a network is increased to a high value such, as by setting a seal in a branch, the results of the whole network analysis are normal even then, and the iteration technique can play the same function.