DYNAMIC MODELING OF A BUCKET-WHEEL EXCAVATOR PROPELLING MOTOR

Abstract

The article reviews algorithmization of a dynamic model of a bucket-wheel excavator propelling motor during its motion. There are essential schemes and formulas used in dynamic modeling algorithmization.

Full Text

Multi-support contours as analytical models are considered in order to determine bearing reaction, bearing load and moments which appear in the process of a bucket-wheel excavator motion at the face. This, in its turn, will help to evaluate a technical state of a bucketwheel excavator [1]. When analyzing the impact of a traveling gear on a bucket-wheel excavator dynamics, we don't consider a set of an excavator motion equations, but focus on specific issues of traveling gears algorithmization and their connections with the whole machine in various operating modes. The reactions to G force action are determined depending on the position of this force projection on the support contour taking into consideration a projection point shift relative to the support contour center. If an axis of a superstructure does not coincide with a force projection point and a geometric center, both shifts are taken into account. In this case we should consider two centers of mass, where G1 is a gravity of a fixed part of a machine, with running-out Q and G2 is a gravity of a swivel part with a resultant running-out S0 relative to the steering axis. Mathematics, mechanics, computer science 96 Thus, the resultant reaction in the support point of a contour: RTj = R′Tj - R′′Tj, where R′Tj is a permanent part of G1 force reaction; R′′Tj is a variable part of G2 force reaction. Calculation is carried out by a rigid lever method by solving an algebraic equation set with a Kutta–Joukowski theorem. Support reactions to the action of horizontal inertia forces are determined on the basis of data got in the process of solution of an equation set of an excavator dynamic model motion. In this case we use an algebraic equation system, that turns a moment action of horizontal resultant inertia force applied to a center of mass at a height of H into support reactions [2].