In modal testing, the measured Frequency Response Functions (FRFs) are often affected by transducer mass effects. Especially in Multi-Input-Multi-Output (MIMO) modal test, multiple sensors are employed and the effects of additional masses are more significant. This paper deal with removing masses effects of multiple sensors from the measured FRFs. The proposed method offers some advantages over the available techniques in that extra FRFs measurements with different configurations are not required during the correction process. First, a general correction formulation is derived theoretically. Then, validations of the proposed methods are demonstrated using simulated data. It demonstrates a good performance in numerical simulation. To investigate the performance of the proposed method in practical application, further simulations are presented by employing noise-polluted data. And it is shown that the accuracy of correction results will be affected to some extent by the noise. It is thus suggested that the measured FRFs be preprocessed using the curve-fitting procedure or noise reduction processing before applying the proposed method. Since the FRFs measurements required for corrections refer to different excitation points, it requires moving the exciter to different locations. This is usually easy to achieve in hammer impact testing. However, moving the exciter is usually inconvenient in shaker modal testing. Further work is necessary to extend this proposed method so as to make it also applicable for shaker modal test case.
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ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
August 6–9, 2017
Cleveland, Ohio, USA
Conference Sponsors:
- Design Engineering Division
- Computers and Information in Engineering Division
ISBN:
978-0-7918-5822-6
PROCEEDINGS PAPER
Correction of Multiple Transducers Masses Effects From the Measured FRFS Available to Purchase
Jun Ren,
Jun Ren
Hubei University of Technology, Wuhan, China
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Jun Wang,
Jun Wang
Hubei University of Technology, Wuhan, China
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Xiaodong Zhou,
Xiaodong Zhou
Beijing Institute of Control Engineering, Beijing, China
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Kwun-Lon Ting
Kwun-Lon Ting
Tennessee Technological University, Cookeville, TN
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Jun Ren
Hubei University of Technology, Wuhan, China
Jun Wang
Hubei University of Technology, Wuhan, China
Xiaodong Zhou
Beijing Institute of Control Engineering, Beijing, China
Kwun-Lon Ting
Tennessee Technological University, Cookeville, TN
Paper No:
DETC2017-67516, V008T12A040; 6 pages
Published Online:
November 3, 2017
Citation
Ren, J, Wang, J, Zhou, X, & Ting, K. "Correction of Multiple Transducers Masses Effects From the Measured FRFS." Proceedings of the ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. Volume 8: 29th Conference on Mechanical Vibration and Noise. Cleveland, Ohio, USA. August 6–9, 2017. V008T12A040. ASME. https://doi.org/10.1115/DETC2017-67516
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