Experimental modal analysis of nonlinear systems by using response-controlled stepped-sine testing
نویسندگان
چکیده
Abstract Although the identification and analysis of structures with a localized nonlinearity, either weak or strong, is within reach, multiple nonlinearities coexisting at different locations still challenge, especially if these are strong. In such cases, identifying each nonlinearity separately requires tedious work may not be possible all in some cases. this paper, an approach for experimental modal nonlinear systems by using Response-Controlled stepped-sine Testing (RCT) proposed. The proposed applicable to several various locations, provided that modes well separated no internal resonances occur. Step-sine testing carried out keeping displacement amplitude driving point constant yields quasi-linear frequency response functions directly, from which parameters can identified as mode concern, employing standard linear tools. These then used calculating near-resonant curves, including unstable branch there any, untested harmonic forcing RCT makes it also extract normal experimentally without sophisticated control algorithms, directly constants, obtain curves constant-amplitude cases extracting isocurves measured Harmonic Force Surface (HFS), new concept paper. key feature HFS its ability branches together turning points constant-force experiment, accurately. method validated numerical case studies. example consists 5 DOF lumped system strong conservative elements. Experimental studies consist cantilever beam supported free-end two metal strips create stiffening real missile structure exhibit moderate damping mostly due bolted joints on structure.
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ژورنال
عنوان ژورنال: Mechanical Systems and Signal Processing
سال: 2021
ISSN: ['1096-1216', '0888-3270']
DOI: https://doi.org/10.1016/j.ymssp.2020.107023