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FME Transactions
2013, vol. 41, iss. 4, pp. 298-304
article language: English

Assessment of the correlation between the numerical and experimental dynamic characteristics of the bucket wheel excavator in terms of the operational conditions
Wroclaw University of Technology, Faculty of Mechanical Engineering, Wroclaw, Poland



In the paper authors present their attempt in the validation process of the numerical model on the basis of experimental results. The Modal Assurance Criterion between the numerical and experimental model was selected as the indicating factor. Moreover, changes in frequencies and the degrees of freedom influencing the most the correlation level were reconsidered. The numerical and experimental models, in most cases, did not cover the influence of the operational load on the dynamic characteristic of the construction. In the new, operational approach, the change in the numerical model composition must be reconsidered, while the old one is no longer valid. Modal analysis performed out of the operational load, give good results but does not represent actual state of the construction in operation. In that case, we have two separate systems with different dynamic characteristics. Identification of the modal model with use of the Operational Modal Analysis gives the information about the object in operation which is a real point of the interest.



*** (2008) Eurokod 7: Projektowanie geotechniczne: Czfšć 1. zasady ogolne PN-EN 1997-1
*** (1990) Metody pomiarow i oceny drgan maszyn pod wzglçdem bezpieczenstwa i higieny pracy. PN-N-01357
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