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Compared with other wave energy converters, point absorber wave energy converter (WEC)is more suitable for small wave conditions, and adapts to China’s coastal wavecharacteristics. Based on the linearregular wave theory, the power characteristic of point absorber WEC wasanalyzed in the paper. Using numerical calculation method based on linearpotential flow theory in frequency domain, we calculated the hydrodynamiccoefficients and response amplitude operator (RAO) of floater in wavecondition. And then the power of the point absorber WEC was calculated undergiven conditions. Based on the calculation, we studied the rule of influence of WEC’s major parameters to its output power. The research result offer importanttheory foundation for optimal design of point absorber WEC’s power characteristic.

A new networked control system is modeled, which has global Lipschitz nonlinearity and network-induced uncertainty including time delay, packet dropout and quantization simultaneously. Then, a class of mode-dependent nonlinear controller is designed, which can effectively eliminate the effects of the uncertainty and ensure the stochastic stability of the controlled system. Furthermore, a linear matrix inequality (LMI) is established and proved, which is a sufficient condition for the existence of the desired controller. According to the LMI, the controller can be explicitly given. Finally, an illustrative example is given to show the validity and practicability.

Turbulence generator is a key part of head box of middle or high speed papermachine. It is used to make the fiber flow smooth and steady. This paper gives simulation researches of the flow status on one turbulent tube of combined-turbulence generator, result shows that there is an optimal rate between the square tube and its equivalent diameter for Round-Square turbulence generator, and the equivalent diameter is 6.5. This guides the design of turbulence generator significantly.