回流水槽における波形解析の試み

抄録

Experiment of wave analysis is performed in circulating water channel by using three high-speed boat models with trim fixed. An apparatus of making a wave height meter traverse in parallel direction to a ship model is deviced and wave measuring system is developed. In order to reduce amplitude of steady waves and inclination of mean water surface of the channel wave supressor and water level are controled by making use of reserve tank. The measured wave configuration caused by the model is subtracted by the one measured without the model to cancell the diverging waves caused from the unevenness of the channel side wall. The results of wave analysis are very well in comparison with total resistance measured by trim fixed type of dynamometer and the wave pattern resistance is almost one third of the total resistance at planning Froude numbers higher than 0.4. The component of diverging wave resistance which is dominant at high Froude number and is noticed as coastal nuisance is calculated from the wave analysis results and it is expanded in terms of bottom cambers of models and running trims. It is concluded that the concave curved bottom boat is better than the others and the control of running trim is moreover important from a view point of reducing the diverging wave resistance.