ISSN: 1451-4117
E-ISSN: 1821-31977
Volume 8 article 167 pages: 1 - 12
Constant exploitation of heavy duty machines, such as the bucket wheel excavator and bridge- type stacker-reclaimer, under the action of highly pronounced dynamic loads, may lead to the failures of their substructures and subassemblies. Unfortunately, high position among the causes of mentioned failures belongs to the designers omissions – mistakes done on the occasion of load analysis, modelling and response analysis. This paper presents an original procedure of calculating external loads caused by force resisting excavation. Model comprises all relevant structural parameters and parameters of duty cycles. Measurements in the real operating conditions have been done in order to establish the credibility of simulation model. Besides that, this paper discusses procedures for dynamic modelling of bucket wheel excavator superstructure. Developed model enables response analysis, with quite satisfactory accuracy, from the engineering point of view. Redesign of the bucket wheel excavator slewing platform, as well as redesign of the bridge-type stacker-reclaimer structure, is presented. The efficiency of these reconstructions is unquestionably confirmed by failureless service of mentioned machines.
Bosnjak, S., Petkovic, Z., Zrnic, N., Simic, G., Simonovic, A.: Cracks, repair and reconstruction of bucket wheel excavator slewing platform, Engineering Failure Analysis, Volume 16, Number 5, pp. 1631-1642, 2009.
Bosnjak, S., Zrnic, N., Simonovic, A., Momcilovic, D.: Failure analysis of the end eye connection of the bucket wheel excavator portal tie-rod support, Engineering Failure Analysis, Volume 16, Number 3, pp. 740- 750, 2009.
Bosnjak, S., Zrnic, N., Petkovic, Z.: Numerical – experimental analysis of structural strength of bucket wheel excavator revolving platform, Proceedings of Second International Conference on Material and Component Performance under Variable Amplitude Loading, pp. 1185-1193, German Association for Materials Research and Testing (DVM), Darmstadt, 2009.
Rusinski, E., Czmochowski, J., Iluk, A., Kowalczyk, M.: An analysis of the causes of a BWE counterweight boom support fracture, Engineering Failure Analysis, article in press, doi: 10.1016/j.engfailanal. 2009.06.001.
Bosnjak, S., Petkovic, Z., Zrnic, N., Pantelic, M., Obradovic, A.: Failure analysis and redesign of the bucket wheel excavator twowheel bogie, Engineering Failure Analysis, article in press, doi: 10.1016/j.engfailanal. 2009.09.007
Bosnjak, S., Simonovic, A., Petkovic, Z., Zrnic, N.: Uporedna analiza cvrstoce varijantnih konstrukcionih resenja donje gradnje rotornog bagera C-700S, Istrazivanja i projektovanja za privredu, Volume 4, Number 14, pp. 19-28., 2006.
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