DYNAMIC OPTIMIZATION OF LOADS, OCCURRING DURING THE BRAKING OF AN OVERHEAD CRANE TRAVEL GEAR: AN ANALYTICAL APPROACH

Abstract

The paper proposes a model for determining the dynamic loads arising during thebraking of an overhead crane travel mechanism. By the methods of mathematical physics, classical variationalcalculus at application of the apparatus of the decision of the usual linear differential equations thelaws of movement of the mechanism of movement of the specified crane at which dynamic loadings in themechanism are minimized are analytically defined. This result gives an opportunity to carry out constructivemeasures for decrease in level of dynamic loading of the crane.In order to reduce the dynamic loads during the braking of the bridge crane movement mechanism,additional measures have been proposed, namely: 1) regulation of crane braking force; 2) reduction of bogieand crane weight by: a) application of steel structures in the form of trusses instead of solid wall ones; b) useof bent profiles for manufacturing of steel structures; c) application of lighter alloys; 3) reduction of the momentof inertia of the electric motor rotor of the crane travel mechanism by: a) using several motors with totalpower equal to the power of one drive motor, which reduces the moment of inertia of the rotor; b) usingmotors with lightweight rotors; 4) using couplings with variable stiffness.The results obtained in the work can be further used to refine and improve the existing engineeringmethods for calculating the braking systems of overhead crane travel mechanisms to minimize the dynamicloads in these mechanisms both at the stages of their design and in the modes of real operation.