Modular Structural Calculations in Underground Drill Rigs
Salonen, Matias VIlle (2015)
2015
Konetekniikan koulutusohjelma
Teknisten tieteiden tiedekunta - Faculty of Engineering Sciences
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Hyväksymispäivämäärä
2015-12-09
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201511251787
https://urn.fi/URN:NBN:fi:tty-201511251787
Tiivistelmä
This thesis deals with creating a structural calculation process for modular underground drill rigs according to the standard series EN 16228 – Drilling and Foundation Equipment. An underground drill rig is a rubber-tyred mobile electro-hydraulic machine that’s purpose is to drill holes. The objective is to sort out and describe the flow of the process, focusing on documentation and the utilization of the company’s Product Data Management (PDM) system. The secondary aims are to focus on the fatigue calculation methods of welded joints according to the recommendations of the International Institute of Welding (IIW) as well as to investigate the usage of Ansys Customization Toolkit (ACT) tools provided by the Ansys Heavy Duty toolkit extension. Additionally, the structural calculations on the elastic stability’s behalf are conducted for plate fields according to SFS-EN 13001-3-1.
The process begins with the derivation of the loads, which are then processed into load cases using three different approaches. The first approach is derived from the EN 16228 by unambiguously determining the load cases and their safety factors using the allowed stress method. The second – and the third approach are derived from the crane standard EN 13001, which includes both the limit state method and the allowed stress method approaches. Thereafter the structure is analyzed statically using Finite Element Analysis (FEA). The approaches are then compared and the most suitable way is selected. Then, the fatigue assessment of the welded structure is executed. Thereafter the verification and the validation of the results are explained. Then the whole process is documented in the PDM-system.
Overall, as a result, the main steps and the calculation methods of the process are now clarified and instructed. The process can be documented and its details are traceable. Additionally the results of the structural calculations indicate that the usage of the crane standard will lead to over-conservative results and thus, diminishing the machines competitiveness in the market by adding weight in the form of over-designed structures. Therefore the EN 16228 allowed stress method will be used in the future analyses. The Heavy Duty toolkit proves to be a useful tool that saves analysis-time. The local fatigue calculation methods by the IIW yield to be useful as well. Finally, the calculation methods of elastic stability turn out to be applicable, but become futile when using the EN 16228 allowed stress method. In conclusion, the process that is created in this thesis acts as a benchmark for the following projects down the line.
The process begins with the derivation of the loads, which are then processed into load cases using three different approaches. The first approach is derived from the EN 16228 by unambiguously determining the load cases and their safety factors using the allowed stress method. The second – and the third approach are derived from the crane standard EN 13001, which includes both the limit state method and the allowed stress method approaches. Thereafter the structure is analyzed statically using Finite Element Analysis (FEA). The approaches are then compared and the most suitable way is selected. Then, the fatigue assessment of the welded structure is executed. Thereafter the verification and the validation of the results are explained. Then the whole process is documented in the PDM-system.
Overall, as a result, the main steps and the calculation methods of the process are now clarified and instructed. The process can be documented and its details are traceable. Additionally the results of the structural calculations indicate that the usage of the crane standard will lead to over-conservative results and thus, diminishing the machines competitiveness in the market by adding weight in the form of over-designed structures. Therefore the EN 16228 allowed stress method will be used in the future analyses. The Heavy Duty toolkit proves to be a useful tool that saves analysis-time. The local fatigue calculation methods by the IIW yield to be useful as well. Finally, the calculation methods of elastic stability turn out to be applicable, but become futile when using the EN 16228 allowed stress method. In conclusion, the process that is created in this thesis acts as a benchmark for the following projects down the line.