Characterisation of the dynamic characteristics of a complex jointed structure

Abstract

Abstract. Every structure that assembled with the joints has a significant effect on the dynamic behaviour of the structure. Therefore, the overall dynamic behaviour of the jointed structure highly relies on these joints. Finite element method (FEM) is commonly used to model an element connector for the jointed structure due to its because every jointed structure has its owns joint properties. The aims of this research are to identify the potential element connectors that are available in commercial finite element analysis package in order to represent the joints for spot welds and adhesive joints. The reliability of potential connector elements are quantified by comparing the predicted result calculated from commercial finite element analysis package with the experimental result that obtained from the LMS Scadas. The model of element connectors have been constructed based on three types of the case studies. The comparison reveals that the combination of Type 2 (ACM2) and Type 3 (CWELD) have shown a better capability to represent the joints of the complex jointed structure.

The effect of laser stitch welding residual stress on the dynamic behaviour of thin steel structure

“…Its shows that mode shape in Table 3 are in good agreement with experimental counterpart compared with the mode shapes in Table 2 as agreed in the MAC values shows in Table 1. Previous studies have suggested that the predicted mode shapes with MAC values above 0.70 can be acceptance as in good correlation [5].…”

“…Computerised analysis packages such as the finite element method is found to be more beneficial in predicting the dynamic behaviours of the structure [5]. However, it is difficult and complicated to model the welds itself because of non-linearity effects due to the welding process such as residual stress that are complex and influenced by many uncertain parameters [6][7][8].…”

Finite Element Modelling of Laser Stitch Welding Joints for Structural Dynamic Predictions

“…These data are then compared to finite element analysis results so as to identify the degree of correlations between them. However, before the experiment is conducted, several factors, such as frequency bandwidth, suspension orientation, excitation method and number of accelerometers need to be considered from finite element analysis [35][36][37].…”