Grishin

It was proposed to carry out performance evaluation of active vibration damping in multi-mass dynamic systems of metal structures of excavators and jib cranes when damper’s power body is located between oscillating masses, in comparison with external resistance damping. Results of synthesis of damping effect which provides a specified degree of oscillation decline in metal structures under force excitations and self-oscillations were presented. It was shown that allocation of the active damper’s power body between the working body’s installation unit and metal structures of machines allowed one to improve dynamic properties of the specified machines significantly.

On the basis of mathematical simulation the author proposes an algorithm of an earthmover’s active suspension control; the algorithm provided the required degree of deformation of the main coupled modes. An active force was applied in the function of oscillatory velocities to one linear and two angular coordinates. The combination of an elastic element and the control device, sequentially connected to it, in suspension allows to decrease oscillations of the case over a wide range of frequencies. In this case, high-frequency indignations are filtered by the elastic element, and the low-frequency oscillations of the case are damped by the active system. Decrease of oscillations leads to productivity improvement of the machine