Substantiation of the acceptable risk of use of mobile agricultural machinery with operational damage to details and structural elements

Authors

DOI:

https://doi.org/10.31548/machenergy2019.03.095

Keywords:

diagnostics of technical condition, oper-ational defects, operational risk, mobile agricultural ma-chinery, accidents

Abstract

It is shown that in order to justify the extension of the life of the machine beyond the resource set by the manufacturers, it is necessary to focus on the ac-ceptable (permissible) risks of emergency situations that can lead to accidents. At present, for mobile agricultural equipment, the operation of which relates to work of increased danger, the concept of acceptable risk is not used, it does not allow assessing the danger of staying on fields, farms and roads of machinery without technical safety equipment, with the exhaustion of the established resource.
The purpose of the research is to justify the permis-sible risk of the operation of mobile agricultural machinery, in the array of parts and structural elements of which defects (damage) have accumulated.
In this work, the kinetics of accumulation of operational defects in the array of parts of individual nodes (systems) of tractors is analyzed. The tractor MTZ-80(82) was chosen as the object of research, as one of the most common in Ukraine. To identify cracks, the developed eddy current flaw detector was used, the sensitivity of which made it possible to find cracks several millimeters in length and more without preparing the surface of the parts to be inspected.
It is shown that the kinetic dependences of the accumulation of operational defects in the details of tractor units in the analyzed range of operating durations are monotonically increasing, which can be described by exponential functions with a fairly high reliability.
It was noted that the obtained dependences are similar to the kinetic dependences of the accumulation of static and dynamic (fatigue) damage obtained as a result of laboratory tests of samples of structural materials, which allows us to use approaches to determine the crite-ria for the limiting state of laboratory samples to establish the maximum life of mobile agricultural equipment.
At the same time, the kinetics of the intensity of the initiation of operational cracks in the array of tractor parts is not monotonic and has a maximum in the range of about 11-13 years of operation. This period of operation can be used as a criterion for stopping the operation of the tractor, performing flaw detection of parts and replacing defective parts. With such a duration of operation of the tractor, there is the greatest likelihood of sudden destruc-tion of tractor units and the creation of emergency situations.

References

Safety and health requirements when using production equipment by employees. (2017). Approved by the order of the Ministry of Social Policy of Ukraine from 28.12.2017. № 2072.

Belodedenko S. V. (2009). Development of methods for calculating and researching the strength of metallurgical equipment. Metallurgical and mining industry. № 4. 94-98.

Begun V. V. (2011). The task of determining the current risk of an object of increased danger. Mathematical machines and systems. № 1. 120-126.

Mahutov N. A., Petrov V. P., Ahmethanov R. S., Dubinin E. F., Kuksova V. I. (2010). Some issues of the development of proactive diagnostic systems. Security issues and emergency situations. № 4. 22-48.

Gadenin M. M. (2012). Multiparameter analysis of the conditions of safe operation and security of machines and structures according to the criteria of strength, resource and survivability. Security issues and emergency situations. № 6. 50-56.

Mahutov N. A. (2017). Safety and risks: system research and development. Novosibirsk: Science. 724.

Pituhin A. V., Skobtsov I. G., Hvoin D. A. (2010). Investigation of the influence of technological defects on the strength of the protective frame of the cab of a wheeled tractor. Vestnik MGUL - Lesnoy Vestnik. № 1. 89-92.

Tsyigichko V. N., Chereshkin D. S. (2014). Safe-ty of critical transportation facilities. Saarbrucken: Lambert Academic Publishing. 224.

Levashov S. P., Shkrabak V. S. (2015). Occupa-tional risk: monitoring and analysis methodology. Kurgan. 308.

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Published

2020-01-27

Issue

No. 10(3) (2019)

Section

Статті

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