Abstract
There is an increasing need for accurate, efficient and economical methods for the investigation of the dynamic behaviour of large complex structures within the engineering community. The component mode synthesis (CMS) has been perceived by the community to be an attractive efficient method for the investigation. However, the method has substantial shortcomings, particularly in analysing a structure having a large number of interface degrees of freedom (DOFs) between substructures. This paper puts forward a method, based upon the wave-based substructuring (WBS) for the investigation of the dynamic behaviour of a structure with a large number of interface DOFs. The finite element method is used to construct the full finite element model of the structure and NASTRAN 103 is used for the normal modes analysis. A new finite element model of the structure with reduced interface DOFs is constructed based on the WBS. The measurement of the dynamic behaviour of the structure is carried out using free-free boundary conditions and an impact hammer test. The predicted results of the proposed method are then compared with those from the full finite element model and experimental counterparts. The accuracy and efficiency of the proposed method are discussed and illustrated with two different case studies.
Highlights
Over time, engineering structure has been developed to a certain level of large numerical model which possesses thousand numbers of DOFs
For the first case study, all the normal mode analysis is performed in the frequency of interest range 0-120Hz. 25 number of waves are used as the interface node which has been selected from the sensitivity analysis done
The efficiency and accuracy of wavebased substructuring (WBS) have been demonstrated in two different case studies
Summary
Over time, engineering structure has been developed to a certain level of large numerical model which possesses thousand numbers of DOFs. The application of conventional finite element analysis (FEA) which uses a full finite element model has been widely used and the effort of computing the mathematical model seems to be unsuitable when the computational is too expensive due to the repeated iteration solution performed To overcome this problem, a technique called component mode synthesis (CMS) has been introduced to enhance the computational time process. Since the needs of the FEM is highly demanded by the industry and application of the method is not limited to only a few kind of structures, computing the complex engineering structure through CMS method seems to be impractical This problem arises when the substructures are coupled with a very large interface nodes[4]. As the interface representation is smaller, easier reduction procedure and shorter time frame of the iteration process can be obtained while the accuracy of the prediction is preserved
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