Application of Frequency Domain Substructure Synthesis Technique for Plates Loaded with Complex Attachments

Campbell, RL ; Hambric, SA

Lockheed Martin Corporation, Schenectady, NY (United States)

关键词: Numerical Analysis;    Forecasting;    Response Functions;    Sensitivity;    Simulation;   

DOI  :  10.2172/836291
RP-ID  :  LM-04K003
RP-ID  :  AC12-00SN39357
RP-ID  :  836291

美国|英语

来源: UNT Digital Library

【 摘 要 】

Frequency domain substructure synthesis is a modeling technique that enables the prediction of a combined response of individual structures using experimentally measured or numerically predicted frequency response functions (FRFs). The traditional synthesis algorithm [1,2] operates on component impedances and thus generally requires several matrix inversions. An improved algorithm, developed by Jetmundsen et al. [3], requires a single matrix inversion with a completely arbitrary interface definition that can easily incorporate connection impedances. The main limitations of the method are the large data requirements and sensitivity to data truncation. The utility of this technique is demonstrated through a comparison of synthesized and measured admittances of an edge-stiffened plate with attached equipment. The plate mobilities are obtained from a numerical analysis because of the ability to accurately model this structure using a finite element representation. The attachments are characterized experimentally because of their complexity. The sections describe the synthesis technique and show numerical and experimental results for the plate and equipment.