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Shock and Vibration
Volume 2017, Article ID 6857326, 10 pages
https://doi.org/10.1155/2017/6857326
Research Article

Correction of Transducers Mass Effects from the Measured FRFs in Hammer Impact Testing

1School of Mechanical Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China
2Robotics Institute, Beihang University, Beijing 100091, China

Correspondence should be addressed to Jun Ren; nc.ude.tubh.liam@nujner

Received 23 July 2017; Revised 28 September 2017; Accepted 16 October 2017; Published 13 November 2017

Academic Editor: Matteo Filippi

Copyright © 2017 Jun Ren et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In modal testing, the measured frequency response functions (FRFs) are often affected by transducer mass effects. Especially when multiple sensors are employed, transducers mass effects are more significant. This paper deals with removing sensors mass effects from the measured FRFs in hammer impact testing. 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. Firstly, correction method for single accelerometer case is discussed. Further, general correction formulation for multiple accelerometers case is derived. Then, validations of the proposed method are demonstrated using simulated and experimental data. It shows good effectiveness in experimental validation for single accelerometer case. Numerical simulation also demonstrates a good performance for multiple accelerometers case. However, further simulations with noisy-polluted data show that the accuracy of correction results will be affected to some extent by the noise. It is suggested that the measured FRFs be preprocessed using the curve-fitting procedure or noise reduction processing before applying the proposed method.