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DYNAMIC EXPERIMENTAL TESTING SETUP AND EVALUATION FOR NON-LINEAR RESONANT DECAY METHOD (NLRDM

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Year: 2012
COI code: ISAV02_223
Paper Language: English

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Authors DYNAMIC EXPERIMENTAL TESTING SETUP AND EVALUATION FOR NON-LINEAR RESONANT DECAY METHOD (NLRDM

  Mehdi Sarmast - Mechanical Engineering Department, East Tehran Branch, Islamic Azad University
Jan R. Wright - School of Engineering, The University of Manchester, Manchester, UK.

Abstract:

The previous papers have discussed the theoretical and simulation behaviour of NL-RDM. In this paper preparations for the dynamic experimental testing and evaluation are explored. Any ex-perimental rig used to evaluate NL-RDM would be required to meet certain criteria. Any rig would have to be a multi-DOF setup in order to begin to evaluate the abilities of the method to analyse similar models. So, the rig is introduced and some information about instrumentation and data ac-quisition provided. Parts of the rig will be tested statically and dynamically. The system tested was a 2DOF lumped parameter linear system to which a nonlinear element was added, in the form of a clamped-clamped beam. The beam was evaluated for the degree of nonlinearity present and its suit-ability to be tested experimentally as a cubic stiffening spring.The system was tested using random excitation and FRFs were obtained for analysis. FRFs showed a clear shift in natural frequency for rising levels of excitation, demonstrating clear harden-ing stiffness non-linearity. The system was also tested using stepped sine excitation and FRFs again obtained. The results showed clear ‘jumps’ at higher levels of excitation, again demonstrating that non-linearity was present.The experimental rig is evaluated in relation to the degree of non-linearity present, linearity at low force vibration levels, degree of noise present and other variables that may affect the test re-sults, as discussed in other papers. Additionally other more general problems in testing are dis-cussed and where possible solutions proposed. Following this evaluation a final design is proposed for adoption in the testing phase.

Keywords:

Nonlinear System Identification; NL-RDM; FRF; Experimental Vibration

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COI code: ISAV02_223

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Sarmast, Mehdi & Jan R. Wright, 2012, DYNAMIC EXPERIMENTAL TESTING SETUP AND EVALUATION FOR NON-LINEAR RESONANT DECAY METHOD (NLRDM, 2nd International Conference on Acoustics and Vibration, تهران, دانشگاه صنعتي شريف, https://www.civilica.com/Paper-ISAV02-ISAV02_223.htmlInside the text, wherever referred to or an achievement of this article is mentioned, after mentioning the article, inside the parental, the following specifications are written.
First Time: (Sarmast, Mehdi & Jan R. Wright, 2012)
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The University/Research Center Information:
Type: Azad University
Paper No.: 1243
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