Method of planning experiment on study of the static coefficient of friction of a seine harness on a traction drum of a friction-type mechanism

The static coefficient of friction is the main characteristic of the fishing gear (FG) interaction with the friction machines. Its changes can lead to sliding of the FG on the surface of the drum(-s) of a machine which leads to negative consequences, such as wear of the FG, increasing time for retrieving, increasing energy consumption, etc. Currently, there are precise methods for determining the static coefficient of friction only for thread-rope products (TRP). The article presents a description and planning of the experiment with seine to determine this coefficient in relation to the seine. Experiments have been performed in laboratory conditions to comply with the TRP methodology. To carry out the research, samples of seine have been prepared from three different materials (polyamide, polypropylene, polyester) of the same diameter (2 mm), which will interact with three steel drums of different diameters (104 mm, 128 mm, 152mm). In addition, different contact arc angles (90 deg, 135 deg, 180 deg) have been taken into account. To implement this experiment, a special installation based on the strain station MIC-200 and electric motor simulating the drive of the drum of seine-hauling mechanism has been designed by the Department of Industrial Fisheries. By means of strain gauge the value of the maximum tension of the seine incoming branch (S1) will be recorded and graphical dependences of S1 on the time of the experiment (t) will be plotted. Using the obtained data, we calculate the coefficient of friction in two different ways, classical and by the formula of Nedostup and Orlov. Further, the calculated results will be compared and the corresponding conclusions will be drawn.

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