Problems on comparing analytical and numerical estimations of stressed-deformed state of structure elements

Doronin, S. V.; Rogalev, A. N.; Reizmunt, E. M.

doi:10.3103/s1052618817040069

Cited by 2 publications

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“…Однако в реальных условиях провести испытания является часто затруднительным из-за финансовых, технологических и временных ограничений. Для экономии затрат в ряде исследований [6][7][8][9][10] применяется подход корректировки параметров выборочных распределений. В работе используется данный подход для определения предельного (минимального) значения безотказности, что позволяет обеспечить максимальную безопасность рассматриваемого объекта путём повышения минимальной расчётной безотказности и минимизации риска возникновения неблагоприятного события.…”

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“…С точки зрения надежности машина является идеально безотказной, если в пределах заданного ресурса отказа не возникает. В этом случае детали данной машины откажут приблизительно в одно время, отработав заданное значение ресурса Т р [10,11].…”

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Production Facilities Safety Assessment According to the Maximum Values of Machines Reliability

Deryushev

Teplyakova

Zaitseva

2023

jour

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Introduction. At the stage of designing technical devices and performing appropriate strength calculations of metal structures, sufficiently large reserves of strength are taken, which, theoretically, exclude any failures of parts. In fact, the machines work with frequent failures. Of interest are undiagnosed failures that lead to a critical decrease in safety, especially at hazardous production facilities. It is assumed that the previously applied approaches of selective determination of the maximum (minimum) reliability value, based on point estimates of the distribution parameters of the two-parameter Weibull law, lead to an overestimation of the calculated indicators of the probability of failure-free operation, i.e. underestimation of risk. Therefore, the work objective is to consider an approach to assessing the risk of operating production facilities in a situation of accidental occurrence of dangerous and undiagnosed failures in systems.Materials and Methods. Methods for technical devices safety assessment based on probability theory were used in the work, and the probability of machine failure was determined based on the well-known method of reliability theory. This method consists in calculating and constructing distribution functions of random variables (load-bearing capacity and loading) that influence the occurrence of failure. The level of increase in the reliability index was determined, leading to frequent unpredictable failures of technical devices (machines) and a decrease in the safety of their operation.Results. The signs of inconsistency of strength calculations based on overestimated safety margins, which in theory exclude failures of parts and machines in general, are identified and substantiated. A new approach to risk assessment of operating production facilities in a situation of accidental occurrence of dangerous and undiagnosed failures by safety systems has been developed and implemented. An algorithm for determining the three parameters of Weibull's law for a population based on sample data has been developed. The resource distribution densities of the boom of the single-bucket excavator EK-14 are constructed. The recommendations are given to increase the probability of failure-free operation to 0.9989.Discussion and Conclusion. The results of the conducted research allow us to substantiate a new approach to risk assessment of operating production facilities in the event of dangerous and undiagnosed failures of basic parts by safety systems, leading to negative consequences.

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Production Facilities Safety Assessment According to the Maximum Values of Machines Reliability

Deryushev

Teplyakova

Zaitseva

2023

jour

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“…Нарушение конструкционной безопасности может привести к аварии подъемного сооружения. Вопросы обеспечения прочности крановых металлоконструкций рассмотрены в трудах[2][3][4][5][6], а с позиций безопасности крана как сложной технической системы в работе[7].Целью настоящего исследования является повышение безопасности эксплуатации мостовых кранов модульных конструкций и надежности их сварных металлоконструкций. На основе анализа разрушений металлических конструкций мостовых кранов составлена диагностическая карта сварных соединений металлоконструкций концевых балок с модулями ходовых колес мостового крана.…”

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Improving the Safety of Operation of Overhead Cranes with Welded Modular Construction Based on the Analysis of Their Accidents

Korotkiy

Pavlenko

Panfilova

et al. 2022

jour

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Introduction. The article presents an analysis of the destruction of welds that occurred during the operation of modular overhead cranes. Measures are proposed to prevent the occurrence of such defects in the future, reduce the likelihood of accidents and improve the safety of operation of overhead cranes with a welded modular construction. The relevance of the work is due to the fact that in the Russian Federation approximately 65% of the lifting cranes registered with Rostechnadzor have fulfilled the standard service life.The work objective is to improve the safety of operation of modular overhead cranes and the reliability of their welded metal structures. Achieving the objectives of the work, based on the analysis of the destruction of metal structures of overhead cranes, a diagnostic map of welded joints of metal structures of end beams with modules of travelling wheels of overhead cranes was compiled. The use of the proposed diagnostic card in a production environment will significantly improve the quality of diagnostics of welded joints.Materials and Methods. Investigations of accidents of load-bearing metal structures of cranes by methods of technical diagnostics of destruction of welds that occurred during the operation of overhead cranes of modular design have been carried out. This made it possible to develop a number of measures to prevent accidents of overhead cranes initiated by the destruction of their welded modular structures.Results. Based on the analysis of accidents, a diagnostic map of destructing welded joints of metal structures of end beams with modules of travelling wheels of an overhead crane has been compiled. The use of the proposed diagnostic card will increase the reliability of welded metal structures and improve the quality of diagnostics of welded joints in production conditions.Discussion and Conclusions. As a result of the analysis of structural failures of modular overhead cranes, a number of measures are proposed to prevent the formation of such defects, the occurrence of accidents due to them, and to improve the safety of operation of overhead cranes.

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Problems on comparing analytical and numerical estimations of stressed-deformed state of structure elements

Cited by 2 publications

References 0 publications

Production Facilities Safety Assessment According to the Maximum Values of Machines Reliability

Production Facilities Safety Assessment According to the Maximum Values of Machines Reliability

Improving the Safety of Operation of Overhead Cranes with Welded Modular Construction Based on the Analysis of Their Accidents

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