Comparison study of modal synthesis methods

H. M. Hu, Ming-Shaung Ju, Y. G. Tsuei

研究成果: Conference contribution


It is difficult to find the dynamic characteristics of a complex structure by analytical method. In recent years, the modal synthesis techniques have been developed to determine the characteristics of a complex structure. The purpose of this study is the comparison of existing methods, namely, Leuridan's method, Receptance method and Modal Force Technique (MFT) by using experimental data. All of the three methods determine the dynamic characteristics of the synthesized structure by using the Frequency Response Functions (FRFs) of the substructures directly. The modal testing is used to obtain the FRF of each substructure and the finite element analysis is utilized to determine the rotational FRF which is difficult to obtain by modal testing. Three examples are presented to investigate the differences among these methods. We find that the natural frequencies of a complex structure can be calculated by the determinant of the modal force matrix. The modal parameters of a synthesized structure can be determined by Receptance method and MFT directly. From these modal parameters the FRF of the complex structure can be regenerated. On the other hand, the more accurate FRF of the synthesized structure can be directly obtained by using Leuridan's Method. However, MFT is much easier for determining the natural frequencies of a structure which has more than two substructures.

主出版物標題Proceedings of SPIE - The International Society for Optical Engineering
編輯 Anon
發行者Publ by Society of Photo-Optical Instrumentation Engineers
版本pt 2
出版狀態Published - 1993
事件Proceedings of the 11th International Modal Analysis Conference - Kissimmee, FL, USA
持續時間: 1993 二月 11993 二月 4


OtherProceedings of the 11th International Modal Analysis Conference
城市Kissimmee, FL, USA

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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