'Designing-in' failures and redesign of bucket wheel excavator undercarriage
Само за регистроване кориснике
2013
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
The traveling mechanism of the C-700S bucket wheel excavator is of the two-crawler type. Rigid connections between the undercarriage and the crawler beams offer a very high factor of safety against tipping but at the same time create unfavorable conditions for ground surface adaptation. Connections between the crawler beams and the undercarriage cylindrical girder were realized by means of connection girders with open cross sections (I sections). In order to eliminate the occurrence of cracks, the original undercarriage structure (variant I) has been redesigned (variant II). The key idea was to strengthen the already mentioned connection girders by building in vertical plates. In this way the cross-sections were closed and their torsional rigidity became considerably greater, which led to the adaptation of the traveling mechanism to the ground surface becoming practically impossible. Because of that alone, and within a very short period after the reconstruction, new cracks occurred on ...elements of the original structure and even on added structural elements. Based on the FEA results, it was concluded that cracks occurrence for variants I and II of the undercarriage structure is caused by highly pronounced stress concentration. Subtle load and stress analyses in various working regimes, presented in the paper, led to the achievement of a re-redesigned undercarriage structure (variant III) with more uniform stress distribution. Stress level in the critical zone for variant III of the undercarriage structure is considerably lower than stress levels for both variant (approximate to 2.1 times) and variant II (approximate to 2.5 times). It is very important to note that the weight of the new built-in elements for variant II is six times greater than that for variant III. During ensuing exploitation in extremely heavy duty conditions, no damages for variant III of the considered structure were observed.
Кључне речи:
Undercarriage / Redesign / FEA / Damage diagnostics / Bucket wheel excavatorИзвор:
Engineering Failure Analysis, 2013, 35, 95-103Издавач:
- Pergamon-Elsevier Science Ltd, Oxford
Финансирање / пројекти:
- Одрживост и унапређење машинских система у енергетици и транспорту применом форензичког инжењерства, еко и робуст дизајна (RS-MESTD-Technological Development (TD or TR)-35006)
DOI: 10.1016/j.engfailanal.2012.12.007
ISSN: 1350-6307
WoS: 000329079200010
Scopus: 2-s2.0-84888136373
Колекције
Институција/група
Mašinski fakultetTY - JOUR AU - Bošnjak, Srđan AU - Petković, Zoran D. AU - Simonović, Aleksandar AU - Zrnić, Nenad AU - Gnjatović, Nebojša PY - 2013 UR - https://machinery.mas.bg.ac.rs/handle/123456789/1705 AB - The traveling mechanism of the C-700S bucket wheel excavator is of the two-crawler type. Rigid connections between the undercarriage and the crawler beams offer a very high factor of safety against tipping but at the same time create unfavorable conditions for ground surface adaptation. Connections between the crawler beams and the undercarriage cylindrical girder were realized by means of connection girders with open cross sections (I sections). In order to eliminate the occurrence of cracks, the original undercarriage structure (variant I) has been redesigned (variant II). The key idea was to strengthen the already mentioned connection girders by building in vertical plates. In this way the cross-sections were closed and their torsional rigidity became considerably greater, which led to the adaptation of the traveling mechanism to the ground surface becoming practically impossible. Because of that alone, and within a very short period after the reconstruction, new cracks occurred on elements of the original structure and even on added structural elements. Based on the FEA results, it was concluded that cracks occurrence for variants I and II of the undercarriage structure is caused by highly pronounced stress concentration. Subtle load and stress analyses in various working regimes, presented in the paper, led to the achievement of a re-redesigned undercarriage structure (variant III) with more uniform stress distribution. Stress level in the critical zone for variant III of the undercarriage structure is considerably lower than stress levels for both variant (approximate to 2.1 times) and variant II (approximate to 2.5 times). It is very important to note that the weight of the new built-in elements for variant II is six times greater than that for variant III. During ensuing exploitation in extremely heavy duty conditions, no damages for variant III of the considered structure were observed. PB - Pergamon-Elsevier Science Ltd, Oxford T2 - Engineering Failure Analysis T1 - 'Designing-in' failures and redesign of bucket wheel excavator undercarriage EP - 103 SP - 95 VL - 35 DO - 10.1016/j.engfailanal.2012.12.007 ER -
@article{ author = "Bošnjak, Srđan and Petković, Zoran D. and Simonović, Aleksandar and Zrnić, Nenad and Gnjatović, Nebojša", year = "2013", abstract = "The traveling mechanism of the C-700S bucket wheel excavator is of the two-crawler type. Rigid connections between the undercarriage and the crawler beams offer a very high factor of safety against tipping but at the same time create unfavorable conditions for ground surface adaptation. Connections between the crawler beams and the undercarriage cylindrical girder were realized by means of connection girders with open cross sections (I sections). In order to eliminate the occurrence of cracks, the original undercarriage structure (variant I) has been redesigned (variant II). The key idea was to strengthen the already mentioned connection girders by building in vertical plates. In this way the cross-sections were closed and their torsional rigidity became considerably greater, which led to the adaptation of the traveling mechanism to the ground surface becoming practically impossible. Because of that alone, and within a very short period after the reconstruction, new cracks occurred on elements of the original structure and even on added structural elements. Based on the FEA results, it was concluded that cracks occurrence for variants I and II of the undercarriage structure is caused by highly pronounced stress concentration. Subtle load and stress analyses in various working regimes, presented in the paper, led to the achievement of a re-redesigned undercarriage structure (variant III) with more uniform stress distribution. Stress level in the critical zone for variant III of the undercarriage structure is considerably lower than stress levels for both variant (approximate to 2.1 times) and variant II (approximate to 2.5 times). It is very important to note that the weight of the new built-in elements for variant II is six times greater than that for variant III. During ensuing exploitation in extremely heavy duty conditions, no damages for variant III of the considered structure were observed.", publisher = "Pergamon-Elsevier Science Ltd, Oxford", journal = "Engineering Failure Analysis", title = "'Designing-in' failures and redesign of bucket wheel excavator undercarriage", pages = "103-95", volume = "35", doi = "10.1016/j.engfailanal.2012.12.007" }
Bošnjak, S., Petković, Z. D., Simonović, A., Zrnić, N.,& Gnjatović, N.. (2013). 'Designing-in' failures and redesign of bucket wheel excavator undercarriage. in Engineering Failure Analysis Pergamon-Elsevier Science Ltd, Oxford., 35, 95-103. https://doi.org/10.1016/j.engfailanal.2012.12.007
Bošnjak S, Petković ZD, Simonović A, Zrnić N, Gnjatović N. 'Designing-in' failures and redesign of bucket wheel excavator undercarriage. in Engineering Failure Analysis. 2013;35:95-103. doi:10.1016/j.engfailanal.2012.12.007 .
Bošnjak, Srđan, Petković, Zoran D., Simonović, Aleksandar, Zrnić, Nenad, Gnjatović, Nebojša, "'Designing-in' failures and redesign of bucket wheel excavator undercarriage" in Engineering Failure Analysis, 35 (2013):95-103, https://doi.org/10.1016/j.engfailanal.2012.12.007 . .