International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Overhead cranes are used in production halls, industrial buildings, transshipment yards, automobile factories, as well as in agricultural warehouses. The end carriage is an essential part of any overhead crane. Special attention is focused on the end carriage beam, which is a fundamental component of the end carriage in terms of load and strength. The introductory part of the paper aims to introduce the crane issues, particularly with respect to bridge cranes. The paper attends to the design of the end carriage beam for a single girder bridge crane with a 500 kg load carrying capacity including a strength analysis of the proposed beam. On the basis of the input load data of the end carriage beam and dimensions of area on which the main girder is placed on the end carriage beam, the minimum section modulus in bending was determined through the Allowable Stress Method as a critical parameter for the selection of the end carriage beam. The calculated value of the minimum section modulus in bending is 1416.18 mm3, based on which the U4O beam profile of S235 JR material was selected. One of the objectives is to create a 3D CAD model of the proposed end carriage beam and subsequently perform FEM analysis of the beam using Ansys engineering simulation software. The purpose of the analysis is to determine the maximum bending stress and maximum deflection of the end carriage beam. The results of the FEA analysis demonstrate that the proposed beam is satisfactory in terms of allowable stress and deflection. Moreover, the beam designed in this manner along with the numerical simulation results provides a precondition of its possible future production.

This paper deals with dynamic analysis of bridge crane with one main girder during telpher motion in order to determine dynamic behavior and oscillations while carrying full load. During the telpher motion the main girders and side girders are heavy loaded parts while they undergo forces, moments and oscillations from lifting mechanism that carries workload. The method of analysis is the comparison of results gained through modeling and simulation and experimental measurements. The analysis will be concentrated in finding the nature of dynamic forces, moments and stresses that acts on main crane’s parts and finding the extent and form of oscillations that can cause damage and failures. Also the interest is to study the effects of load swinging in crane’s stability. Results will be shown in the form of diagrams as the solution results of the tested system. Crane is modeled from standard manufacturer, as a special type of Bridge Crane with one main girder and telpher. Conclusions of these analyses are useful for design considerations, dynamic behavior and safety.

This paper deals with dynamic analysis of bridge crane with single girder in order to determine material deformations in their main parts – cables and girder’s, while moving and carrying load. It is known that these are mostly loaded parts in crane, while they accept forces, moments and oscillations from lifting mechanism and load. Analysis will be accomplished using computer modeling and simulations. Work process of crane in the study is forward travel motion. It is assumed that this motion process makes major impact in the deformations of lifting cables and girders due to stress, oscillations, and negative effect of load swinging. The analysis will be concentrated in finding the nature of oscillations that acts on crane and finding the extent and form of materials stress and deformations that can cause fatigue, failures and accidents. Question is whether acting loads exceed elasticity limits, or there are plasticity deformations which lead to permanent damages. Results will be shown in the form of diagrams, contour stress and strain in cables and girders. They will be compared with experimental measurements. Conclusions of these analyses can be useful for design considerations and safety.