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Development and Validation of Methods for Nonlinear System Identification
Blekinge Institute of Technology, School of Engineering.
Blekinge Institute of Technology, School of Engineering.
Blekinge Institute of Technology, School of Engineering.
2011 (English)Independent thesis Advanced level (degree of Master (Two Years))Student thesis
Abstract [en]

In structural engineering, it is common to neglect the nonlinear effects. This is no longer feasible with increasing complex designs and higher demands on the simulation models. This thesis presents a study of the concept of nonlinearity in a structure with emphasis on system identification. Two identification methods are presented in this work. The first method uses a least-square technique in time domain and the second method uses a least-square technique in the frequency domain. These two methods are compared with each other for two different types of excitation: transient and random excitation. The study involves three stages; theoretical modeling, simulation and experimental verification. A single degree of freedom system is used for the simulations and a beam with a local nonlinearity is used in the experiment. The result shows that both identification methods work on simulated data, whereas only the frequency domain method worked well on experimental data. The transient excitation was better on simulated data compared to random excitation, however in the experiment the random excitation gives a more stable and reasonable result.

Place, publisher, year, edition, pages
2011. , 66 p.
Keyword [en]
Nonlinear vibrations, System Identification, Simulation, Shaker testing, Impulse testing.
National Category
Mechanical Engineering
URN: urn:nbn:se:bth-2440Local ID: diva2:829717
Polhemsgatan 28B, LGH 18 Karlskrona 371 40, Mobile: Harshith Nooji -0734898038 Gowtham Natarajan -0734898039 Vijay Varma BH -0734898259Available from: 2015-04-22 Created: 2011-08-31 Last updated: 2015-06-30Bibliographically approved

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