Modelling Studies on the Use of Aluminium Alloys in Lightweight Load-Carrying Crane Structures

Abstract

Summary. The article presents the results of numerical analysis whose aim was to compare the basic dynamic and strength parameters of lightweight load-carrying crane structures made of aluminium alloys and steel. The analysis covered the typical construction of workshop cranes with a span of 3 to 5 meters, girders in the form of an Ibeam and maximum load capacities amounting to 5 tons. The values of stresses, deflections and natural frequencies were compared and then matched with the masses of the various structures. In the simulation a girder model was used and computed by the finite element method. BADANIA MODELOWE WYKORZYSTANIA STOPÓW ALUMINIUM W USTROJACH NOŚNYCH LEKKICH SUWNICStreszczenie. W artykule przedstawiono wyniki analizy numerycznej, której celem było porównanie podstawowych parametrów dynamicznych i wytrzymałościowych ustrojów nośnych lekkich suwnic wykonanych z aluminium i stali. Analizie poddano typowe konstrukcje suwnic warsztatowych o rozpiętości od 3 do 5 metrów, o dźwigarach w postaci dwuteownika i maksymalnych udźwigach wynoszących 5 ton. Porównywano wartości naprężeń, ugięć i częstotliwości drgań własnych, a następnie zestawiono je z masami poszczególnych ustrojów. W symulacji wykorzystano model dźwigara obliczany z wykorzystaniem metody elementów skończonych.

The effect of the gantry crane beam cross section on the level of generated stresses

“…Displacement boundary conditions are used in the discussed problems [2][3][4][5][6][8][9][10][11]. The nodes located on the contact surface of the gantry crane beam with the support column on the right side of the beam can not displace in three directions (u x =u y =u z =0) and the left side in two directions (u x =u y =0) (Fig.…”

“…The construction of the overhead crane with a double girder is often analyzed [2][3][4], while a single beam is usually used in the gantry crane [5] and analyzed in this paper. The gantry cranes with a single girder are often used in the auto workshops, they are smaller and about simple design [5,6]. Usually, the gantry cranes are made with steel [2][3][4][5], but they can be making with selected aluminium alloys because they have good mechanical properties and enhanced corrosion resistance.…”

“…Taking into account the dynamic parameters of the analyzed structures, it must be noted that those made of aluminium alloy show much less stiffness. Therefore, for larger bridge spans and larger load capacities, their use may be illegitimate because of the permitted deflection of the girder [6].…”

“…Dynamic effects in case of problems with moving loads are not often considered [7]. Usually, the load movement is neglected and numerical analysis is performed for its one position in the center of the beam length [2][3][4]6] Numerical simulations that allow analyze of mechanical phenomena in subsequent positions of load force, over the entire length of beam range, can be found in [5] and will be presented in this paper.…”

Identification and Verification of Dynamic Parameters for the Welding Manipulator

“…This situation can lead to significant production losses. Therefore, the prediction of the failures is very necessary and the determination of the linear guiding systems loads is the main task for calculations and simulations on the welding manipulator mechanical model [2,3,16].…”