Finite element analysis and vibration testing of a three-dimensional crane structure

摘要

This paper aims to develop a finite element model for a scale crane rig in the laboratory such that the dynamic characteristics of the scale crane rig can be predicted from the relevant features of the developed finite element model. First of all, the finite element modelling and experimental modal testing for the scale crane rig are carried out. Two kinds of coupling connecting the load cell and the tested structure for achieving the better experimental outcome are proposed. Then, the finite element model is modified, according to the experimental results, using various techniques. The presented results reveal that the new modified finite element model, by replacing the conventional infinite rigidity for the ground-fixed nodes with the appropriate stiffness for the translational and rotational springs, can predict the vibration characteristics of the experimental crane rig with satisfactory accuracy.