Application Of Beam Elements To Spot-welded
Thin-wall Structure Dynamics
Author(s)
H. Andou, T. Katayama, T. Koizumi, N. Tsujiuchi & S. Enoki
Abstract
This paper introduces a new approach to analyse the dynamics of spot-welded
thin-wall structures with the aid of beam elements. The study is focused on a
cabin structure for hydraulic excavators. The cabin main frame consists of
complex shape section profiles manufactured by spot welding of sheet metal
parts. In order to be able to predict the overall stiffness and vibration behavior of
the cabin structure from the early concept design stage, a simplified beam model
is proposed. At first, tests and analyses of twisting and impact conditions are
performed on the spot-welded profiles to determine their stiffness and damping
ratio with high accuracy. Then, the torsional stiffness and damping ratio derived
by the proposed analytical procedure based on the experimental data are applied
into the beam elements of the simplified cabin model. In order to validate the
simplified cabin model, static load and impact tests are done on the actual cabin
structure. The agreement between the calculated results and the experimental
data confirms that the simplified beam model of the cabin and the proposed
procedure can be used from the early design stage to calculate the overall
deformation of spot-welded thin wall structures.
1 Introduction
The main frame of a hydraulic excavator cabin is designed using various profiles
with complex shape section, manufactured by spot-welding of sheet metal parts.
When the layout of the cabin on the chassis is established, the overall
deformation of the cabin must be known in order to decide the clearances
between the cabin and the surrounding components. However, the analysis
Keywords
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