The influence of forces of viscous resistance on the efficiency of damping in hinges with large gaps in the crane-manipulator installations

The article considers regularities of the influence of forces of viscous resistance generated by the damper device in the cylindrical hinges of the nodes connect the links of the crane-manipulator units mobile transport-technological machines. The specified effect is considered on the efficiency of the damping of oscillations of the metal in the process of operation, due to the presence of increased clearances due to wear of the holes of the hinge eyes. It is shown that the force of viscous resistance should be considered in addition to the generated damping devices forces of elastic resistance, as the latter determine the effectiveness of damping in general. The main role of forces of viscous resistance is the dissipation of energy of an oscillatory turning movement of the mating parts of the metal structures due to oscillatory displacement of the hinge pin within the hinge gap until the complete decay of oscillations. Considered in relation to the crane-manipulator installing mobile transport-technological machines AST-4-A the effect of the action of forces of viscous resistance is almost not observed when the coefficient of viscous damping less than 0.01 MN∙s/m, in the range 0,01…0,05 MN∙s/m this influence begins to manifest itself more and more noticeable, in the range of 0,05…0,4 MN∙s/m has a lot of damping vibrational displacement of the hinge pin within the gap, while the coefficient of viscous damping more than 0.4 MN∙s/m oscillatory process becomes aperiodic with an almost complete attenuation in the range of one oscillation of the hinged finger.