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Shen Fan
Institute of Vibration
Engineering Rsearch,
Nanjing University of Aeronautics
and Astronautics,
Nanjing 210016, China
Zheng Min
College of Civil
Aviation,
Nanjing University of
Aeronautics
and Astronautics,
Nanjing 210016, China
Chen Huaihai
Institute of Vibration Engineering Research,
Nanjing University of Aeronautics
and Astronautics,
Nanjing 210016, China |
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USING CROSS-CORRELATION
THEORY TO EXTRACT MODAL
PARAMETERS IN FREQUENCY-DOMAIN*
Abstract:
Conventional modal parameter identifications are usually based on frequency response functions, which require measurements of both the input force and the resulting response. How-ever, in many cases, only response data are available while the actual excitations (such as wind/wave load) are not measurable.
Modal parameters estimation must base itself on response-only
data. Over the past years, many time-domain modal parameter
identification techniques from output-only are proposed. A poly-reference frequency-domain modal identification scheme on response-only is presented. It is based on coupling the cross-correlation theory with conventional frequency-domain modal parameter extraction. An experiment using an airplane model is performed to verify the proposed method.
Key words:
Modal identification Vibration testing Cross-correlation theory Operating conditions |