Aiming at the navigation purpose of long time and large distance of UUV( unmanned underwater vehicle), and dealing with the energy demand of UUV for long continuous work, on the basis of analysis and comparison of existing wave energy converters at home and aboard, a rocking energy generation device based on the wave energy is proposed. The equations of motion for the vehicle and the rocking pendulum are established according to Lagrange method. Finally, the factors affecting the rocking generation performance are analyzed by solving the simplified equation of motion according to the Runge-Kutta method. The influence of parameters on the rocking generation is investigated over a range of sea state. Research and analysis show that the proposed wave energy rocking generation device model is reasonable and feasible, and provide a theoretical basis and reference for the development, the engineering test and the optimization of the rocking generator.

This paper presents the engineering analytical models of photovoltaic (PV) water pumping system from electronics theory, and some mathematical models of system components have been established. Studies have shown that the minimum unit water cost may not be reached only with the control strategy of maximum output power of the system. Therefore, system optimization is very necessary to reducing the capacity for every unit of pumped water, which is based on the design optimization theory and has shown its economics.