Takeshi Yamane

The virtual mass of plane nets

A series of experiments was performed with the purpose of getting the fundamental aspects of the virtual mass effects acting on the net gear motion. Three types of webbings; monofilament with double sheet bend, lmotless multifilaments and multifilaments with sheet bend, were used in the experiments. The motion offramed plane nets were recorded as the change in the force through the strain gauge on a recorder. The virtual mass of webbing consisting of multifilament with sheet bend became larger than the other two types. When inclined angle with respect to the moving direction was 0°, the virtual mass represented the maximum value in all cases. The virtual mass effects acting on the mesh size appeared clearly when mesh size became relatively small. The results suggest that the virtual mass of webbing is variable and depends upon the mesh size and the surface shape of webbing in addition to the state of motion.