Wireless data acquisition in short distance and low-voltage power transmission in long distance are applied in such system for the first time.

Voltage transmission can be described as network model,minimizing cost is equal to minimizing the length and maximizing the carrying capacity of power cables at the same time;apply the Dijkstra algorithm and the Ford-Fulkerson algorithm in graph theory to solve the problem of minimizing cost in voltage transmission.

Based on the theory of electric transmission line and the electroacoustic analogy method, the T_type equivalent network of the acoustic waveguide which is uniform and finitely long is derived in which plane wave propagate and the formula of its impedance transfer is obtained as well by means of the equivalent circuit analysis.