Shock and Vibration

Shock and Vibration / 2010 / Article

Open Access

Volume 17 |Article ID 502829 |

Alexander Steinwolf, "Shaker Random Testing with Low Kurtosis: Review of the Methods and Application for Sigma Limiting", Shock and Vibration, vol. 17, Article ID 502829, 13 pages, 2010.

Shaker Random Testing with Low Kurtosis: Review of the Methods and Application for Sigma Limiting

Received16 Jul 2007


The non-Gaussian random shaker testing with kurtosis control has been known as a way of increasing the excitation crest factor in order to realistically simulate ground vehicle vibrations and other situations when the time history includes extreme peaks higher than those appearing in Gaussian random signals. However, an opposite action is also useful in other applications, particularly in modal testing. If the PSD is the only test specification, more power can be extracted from the same shaker if the crest factor is decreased and an extra space is created between the peaks of reduced height and the system abort limit. To achieve this, a technique of sigma clipping is commonly used but it generates harmonic distortions reducing dynamic range of shaker system. It is shown in the paper that the non-Gaussian phase selection in the IFFT generation can reduce kurtosis to 1.7 and bring the crest factor of drive signals from 4.5 to 2. The phase selection method does this without any loss of the controller's dynamic range that inevitably occurs after sigma clipping or polynomial transformation of time histories.

Copyright © 2010 Hindawi Publishing Corporation. 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.

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