Artificial boundary condition approach for structural identification: A laboratory perspective

Y. Lu, Z. Tu

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The artificial boundary method (ABM) provides a possibility to generate additional modal frequency information for a test structure under different support conditions (artificial boundary condition or ABC) without the need to physically impose such additional supports during a vibration test. Therefore, it has the potential to considerably enrich the response dataset for the purpose of structural identification and finite element model updating. The general implementation and effectiveness of the approach has been demonstrated extensively in a recent study by the authors with numerical examples. However, as the method is based on the premise that the required frequency response functions can be measured with good accuracy, the practical aspects of the implementation in an actual measurement environment need to be investigated. This paper presents a preliminary experimental study of the method with the laboratory test of a steel beam model. The issues associated with the inversion calculation of the FRF function matrix are highlighted, and possible improvements are discussed. The feasibility of using only the lowest few ABC frequencies in conjunction with a variety of ABC configurations is also examined with a numerical example.
Original languageEnglish
Title of host publication26th Conference and Exposition on Structural Dynamics 2008, IMAC-XXVI; Orlando, FL; United States, 4 - 7 February 2008
Subtitle of host publicationConference Proceedings of the Society for Experimental Mechanics Series
Publication statusPublished - 4 Feb 2008


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