Application of substructuring methods to the dynamic finite element analysis of a container refrigeration unit frame structure

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Title: Application of substructuring methods to the dynamic finite element analysis of a container refrigeration unit frame structure
Author: Chen, Chung-Kang
Abstract: Substructuring is a technique in finite element analysis for solving mechanical engineering problems involving large structures which are too enormous for existing computer hardware and software to handle. This technique involves breaking the system into parts, analyzing the parts, and then re-assembling the total system using selected degrees of freedom from the parts. This thesis also provides a review of substructure theory as a background. The state-of-art involving different approaches of the method is presented . The ANSYS finite element analysis program is used for the case studies of analyzing a container refrigeration unit frame structure. The experimental vibration test results on the structure are used for comparison with the analytical results from the modal analysis of the various case studies. Results from case studies of both the simple models and the complicated container refrigeration unit frame structure all indicate that substructuring by ANSYS renders better solutions than the conventional modal analysis with appropriate numbers of mass master degrees of freedom specified for each substructure. Additional master degrees of freedom are required in substructure dynamic analysis to achieve reliable solutions. Computer time saving is not achievable by using substructuring in ANSYS for dynamic analysis due to the excessive calculations used by the wave front solver for generating each substructure analysis. Computer time saving is only achievable for the cases of analyzing a structure representing repetitive or symmetrical features in geometry .
Record URI: http://hdl.handle.net/1850/11688
Date: 1992-06

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