Prediction of technological reliability of the flax harvesters

Abstract

The topicality of the paper is envisaged by the present-day state of flax growing in the country, as well as by the importance of flax cultivation in ensuring the ecological, foodstuffs, military and medical security of the state. The investigation is aimed at improving the efficiency of using flax harvesters whose technological reliability proves to be the evaluation index of these machines. The coefficients of technological reliability, the technological mean-time-between-failures of flax harvesting units within the shift and the number of such failures for these units within the period of replacement were taken as the indicators of technological reliability. The research is also aimed at determining the effects of the duration of shift-based servicing on the above indicators of their technological reliability. The investigation into ЛК-4T flax harvesters as part of the corresponding harvesting units is carried out in time of harvesting fiber flax industrial sowings under the conditions of large-scale flax sowing enterprises of Zhytomyr oblast in the period of well-balances flax cultivation in Ukraine.
The use of the principles of the dispersion analysis of the irregular unifactor complex on the basis of handling the checklists of step-watch reading of the use of flax harvesting units has made it possible to prove on the level of the corresponding probability the importance of the effects of shift-based servicing of flax harvesters on the coefficient of their technological reliability, the duration of the mean-time-between-failures within the period of replacement of flax harvesting units and the number of the mean-time-between-failures of these units. The results of the correlation and regression analysis make it possible to establish that the increase in the duration of the shift-based servicing of harvesters results in the increase in the coefficients of their technological reliabilities and in the duration of the operation time of harvesters in the period of shift-based work of units, the number of technological mean-time-between-failures in the period of shift-based time decreasing. The use of standard software and R2-coefficient makes it possible to determine the linear character of increasing the coefficient of technological reliability of harvesters and of the operation time within the shift and its effects of the mean-time-between-failures of harvesters, as well as the curvelinear decrease in the number of technological mean-time-between-failures of harvester in the shift period of harvester units depending on the duration of the shift-based servicing of harvesters. When using the values of positive angular coefficients of predicted equalized straight lines, the author succeeds in determining the intensity of increasing the coefficient of the technological reliability and operation time and its effects on the technological mean-time-between-failures within the shift time depending on the duration of their shift-based servicing. The increase in this duration the number of the technological mean-time-between-failures of the harvester during the shift time of units results in the decrease according to the equation of the exponential function. On the basis of the joint solution of the approximating equations related to the change in the number of the technological mean-time-between-failures depending on the duration of shift-based servicing the minimum duration of this servicing is determined.
The prediction dependences obtained must be taken into account for developing the technical rules and regulations for servicing the promising models and samples of flax harvesters, as well as for using the up-to-date brands of these machines.