Song Dalei

Autonomous ocean turbulence measurements on a moored instrument in the South China Sea

A moored and autonomous test has been taken in the South China Sea(SCS) with a turbulence measurement instrument that measures small-scale shear velocity using shear probes designed by OUC(Ocean University of China). The MTMI (Moored Turbulence Measuring Instrument) is embedded in a raindrop shape floating body, which is made of buoyancy material of glass microsphere. A accelerate senor is used for vibration measurement and removing the vibration noise. The data which contain velocity signals, vibration noise and attitude signals are sampled for 110 days. The pitch angle varies between -10°and +10°and does not changes in response to variations of current speed, showing that the instrument is stable. The measured velocity spectra are severely contaminated by eddyshedding from the mooring cable. With the consideration that y axes might not be rigidly perpendicular to the sensitivity beam of the shear probe, we develop double probe correction with two acceleration signals: y and z to eliminate the noise. As a result, the dissipation rates reduce two orders of the magnitude, being consistent with the scaling estimated from the SCS. The turbulent kinetic energy of dissipation rates calculated with data measured by MTMI are from 10-9 to 10-4 W/kg.

The Design of Client Software for Self-Contained Turbulence Observation Instrument

Aiming at the communication between the turbulence observation instrument and PC, the client software is designed for the turbulence observation instrument by using Matlab and VC++ hybrid programming method, in order to provide a solution to the problems for the high sampling frequency, the large amount of data, complex data processing of marine turbulence observation. Under the Windows operating system, VC++ is adopted to complete framework customization and interface development, Matlab is used to complete large amount of turbulence original signal extraction and splicing with its powerful matrix calculation and data manipulation and numerical analysis function, and Matlab is also used to calculate the result of turbulent kinetic energy dissipation rate. Testing and sea trial results show that the software is reliable, easy to operate, suitable for self-contained turbulence observation instrument.

The design and implementation of the marine temperature logger client software based on hierarchical architecture

Aiming at the functional requirements for the marine temperature logger, the client software was designed based on hierarchical architecture. Then a general design method was proposed for marine instruments. The division of data layer, control layer and view layer in this software, as well as the realization of every layer was introduced in detail. Software programming adopted object-oriented programming language C++. The control layer using the finite state machine better meet efficient real-time purpose. Temperature fitting uses Steinhart-Hart equation and least squares method. The experiment as well as the application indicates that the software has many features such as easy usage, friendly interface, stable performance and good expansibility.

An obstacle-avoidance path-planning in robot soccer based on Refined Genetic Algorithms

An intelligent obstacle-avoidance algorithms in robot soccer based on Refined Genetic Algorithms is introduced in the paper and this method is used to plan the path of the robot in robot soccer based on Microsoft Robotics Simulation Platform. The genetic algorithms display a better obstacle-avoidance effect from the data based on Microsoft Robotics Simulation Platform 11 VS 11. Because of high fidelity robot car of the platform, the algorithms can be used in the real robot soccer and it is practically significant to achieve victory and reduce the loss of robot cars in competition.