To make a precise analysis possible at high operation speed by obtaining flow rate of a city water pipe net and the like by a current rule valid on a formed electrical network, a current voltage rule and nonlinear resistance simultaneous equations that satisfy specific branch characteristics.
A calculation method for a node current voltage at each node of a network that corresponds a city water pipe net to a nonlinear circuit net is applied, a resistance of city water pipe is replaced with a resistance on an electrical network, a capacitor is inserted in each node in an arithmetic of nonlinearization prohibition of applied calculation method and is made a virtual nonlinear simultaneous differential equations and a convergence solution for simultaneous differential equations is obtained by a value solution for a differential equation. That is, in a relation Qij(1/rij)1/n(Hij)1/n between a flow rate Qij which connects nodes ij at each node of the net of water pipes and a loss Hij on the electrical network, Q forms the current and H forms branch characteristics corresponding to voltage differences between the nodes; the whale water pipe net is replaced on the electrical network and the flow rate of the city water pipe net is obtained by the nonlinear resistance simultaneous equations that satisfy the current rule, current voltage rule and the branch characteristics valid on the formed electrical network.
JINNO KENYA
TANAKA MAMORU
NAKAJIMA EIJI
MORI TAKUYA
FUJI TEKOMU KK