Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/142708
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dc.contributor.authorLin, Rongmingen_US
dc.contributor.authorNg, Yong Tengen_US
dc.date.accessioned2020-06-29T01:30:05Z-
dc.date.available2020-06-29T01:30:05Z-
dc.date.issued2018-
dc.identifier.citationLin, R., & Ng, Y. T. (2018). A new method for the accurate measurement of higher-order frequency response functions of nonlinear structural systems. ISA transactions, 81, 270-285. doi:10.1016/j.isatra.2018.05.015en_US
dc.identifier.issn0019-0578en_US
dc.identifier.urihttps://hdl.handle.net/10356/142708-
dc.description.abstractHigher-order frequency response functions (FRFs) are important to the analysis and identification of structural nonlinearities. Though much research effort has been devoted recently to their potential applications, practical issues concerning the difficulty and accuracy of higher-order FRF measurement have not been rigorously assessed to date. This paper presents a new method for the accurate measurement of higher-order FRFs. The method is developed based on sinusoidal input, which is ideal for exciting a nonlinear structure into desired regimes with flexible control, and the correlation technique, which is a novel signal processing method capable of extracting accurate frequency components present in general nonlinear responses. The correlation technique adopted is a major improvement over Fourier transform based existing methods since it eliminates leakage and aliasing errors altogether and proves to be extremely robust in the presence of measurement noise. Extensive numerical case studies have been carried out to critically assess the capability and accuracy of the proposed method and the results achieved are indeed very promising. Interesting nonlinear behavior such as frequency shift and jump have been observed in first-, second- and third-order FRFs, as well as solitary islands which have been identified over which higher-order FRFs virtually do not change as input force amplitude varies. Higher-order FRFs over such solitary islands are essentially their theoretical counterparts of Volterra transfer functions which can be measured with very low input force and can be profitably employed for the identification of physical parameters of structural nonlinearities. Subsequently, a nonlinear parameter identification method has also been developed using measured higher-order FRFs and results are presented and discussed.en_US
dc.description.sponsorshipMOE (Min. of Education, S’pore)en_US
dc.language.isoenen_US
dc.relation.ispartofISA transactionsen_US
dc.rights© 2018 ISA. All rights reserved.en_US
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleA new method for the accurate measurement of higher-order frequency response functions of nonlinear structural systemsen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.identifier.doi10.1016/j.isatra.2018.05.015-
dc.identifier.pmid29885737-
dc.identifier.scopus2-s2.0-85048532040-
dc.identifier.volume81en_US
dc.identifier.spage270en_US
dc.identifier.epage285en_US
dc.subject.keywordsNonlinear Vibration Measurementen_US
dc.subject.keywordsMeasurement of Higher-order FRFsen_US
item.grantfulltextnone-
item.fulltextNo Fulltext-
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