Adhikari, S and Woodhouse, J (2002) Identification of damping: Part 4, error analysis. Journal of Sound and Vibration, 251. pp. 491-504. ISSN 0022-460XFull text not available from this repository.
In previous papers (S. Adhikari and J. Woodhouse 2001 Journal of Sound and Vibration 243, 43-61; 63-88; S. Adhikari and J. Woodhouse 2002 Journal of Sound and Vibration 251, 477-490) methods were proposed to obtain the coefficient matrix for a viscous damping model or a non-viscous damping model with an exponential relaxation function, from measured complex natural frequencies and modes. In all these works, it has been assumed that exact complex natural frequencies and complex modes are known. In reality, this will not be the case. The purpose of this paper is to analyze the sensitivity of the identified damping matrices to measurement errors. By using numerical and analytical studies it is shown that the proposed methods can indeed be expected to give useful results from moderately noisy data provided a correct damping model is selected for fitting. Indications are also given of what level of noise in the measured modal properties is needed to mask the true physical behaviour.
|Divisions:||Div C > Applied Mechanics|
|Depositing User:||Cron job|
|Date Deposited:||16 Jul 2015 13:09|
|Last Modified:||31 Aug 2015 04:36|