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本文在用计算机解算矿井通风网路时,扩展了传统方法——“最小生成树”理论中自划网孔时所没有顾及的方面,重新编制了网孔选择程序,从而增大了计算机解算通风网路的能力。用传统方法所编制的程序有一个重要的特点,即在网路中固定风量分支数(NBFIXQ)与扇风机分支数(NBFAN)之和必须限制在小于或等于所需的独立网孔数(NM),即NBFIXQ+NBFAN≤NM。本文针对矿山生产中可能遇到的几种不能满足上述限制条件的通风网路使用了分支修改的方法并重新编制网孔选择程序。在圈划网孔时,将过多的扇风机分支转化为普通分支,这样在每个网孔中仍然只包含一个固定风量分支或一个扇风机分支。而在网路迭代计算开始之前,将这些修改的分支再恢复成扇风机分支,从而不影响网路迭代计算。考虑节省机时,在程序中首先顺序识别网路各节点相关联的分支类别,然后比较扇风机分支数与固定风量分支数之和与独立网孔数,发现有过多的扇风机分支时,即对各扇风机分支进行阻力比较,将阻力最小的扇风机分支修改为普通分支,使网孔选择得以继续进行。对于不易明显识别的情况,安排在对网路最小生成树检查过程中确定。用这种方法编制的程序使原来的限制条件NBFAN+NBFIXQ≤NM变为NBFIXQ≤NM,因而使计算机自动选择网孔的范围大大扩展。由于修改的扇风机分支是阻力小的分支,故仍然保持最佳收敛性。新编程序已在金属矿山通风网路分析中使用,效果良好。文中也列举了改进程序的框图和应用实例。
In this paper, we use computer to solve mine ventilation network and extend the traditional method, which is not taken into account when meshing from the “minimum spanning tree” theory, and reorganize the mesh selection procedure to increase the computer solution Calculation of ventilation network capacity. An important feature of the program prepared by the traditional method is that the sum of the NBFIXQ and the fan fan branch number (NBFAN) in the network must be limited to less than or equal to the required number of independent cells (NM ), Ie NBFIXQ + NBFAN≤NM. In this paper, several methods that can be encountered in mine production that can not meet the above restrictions are used in the branch network and the mesh selection procedure is re-programmed. When meshing cells, converting too many fan fans branches into normal branches still contains only one fixed fan branch or one fan fan branch in each cell. Before the start of the iteration of network computation, these modified branches are then restored to the fan fan branch, so as not to affect the iterative computation of the network. Consider saving machine time, in the program, firstly identify the branch categories associated with each node in the network, and then compare the sum of the fan fan branch number with the fixed air flow branch number and the number of independent cells, and when there are too many fan fan branches, That is, fan fan branch resistance comparison, the resistance of the smallest fan fan branch to modify the ordinary branch, the mesh selection to continue. For not easily identifiable situation, arranged in the network minimum spanning tree check process to determine. The program prepared in this way makes the original NBFAN + NBFIXQ≤NM become NBFIXQ≤NM, so that the scope of the computer automatically selecting the mesh greatly expands. As the modified fan fan branch is a small resistance branch, so still maintain the best convergence. The new program has been used in metal mine ventilation network analysis, the effect is good. The article also lists the improved program block diagram and application examples.