About the significance of the factors determining laboriousness of forest machines maintenance

The article presents a proven method of estimating the significance of factors that determine the laboriousness of forest machines maintenance. To estimate the factors used two-factor analysis of variance of the technical impact conditions. The performance of maintenance and repair depends on many factors: the mechanical equipment of the repair and maintenance base, the qualification and experience of repair workers, the age and operating time of machines and other production and climatic conditions. In the cost of production of the forest complex up to 30 % of the costs associated with the technical operation of machinery and equipment. Studies of significance, use, and sometimes change of factors affecting these costs are relevant, especially in modern market conditions. In the article a specific example was carried out to estimate the significance of the experience of professionals who perform maintenance of machines, and amount of work hours achieved by those machines in ordinary use. The use of analysis of variance allows us to estimate the impact of qualitative and quantitative factors. The essence of the study of the significance of factors is to decompose the total variance by the sum of the variances. The impact of each factor on the studied feature is estimated by its contribution to the total variance. Approbation of a comparative estimation of the significance of the experience of repair workers and the total operating time of servicing machines is carried out on the example of the LP-30B cutting machines. The material for the research was the data of time observations of the Karelian Research Institute of the Forest Industry, conducted in the framework of the development of regulations on maintenance and repair of machinery and equipment of the logging industry. Studies have shown that the magnitude of the generated machine online the most significant compared to the significance of the work experience of the professionals performing the maintenance. Examining in this way all the factors that characterize the conditions of technical operation of machines and equipment, you can determine the list of the most significant and use them in the organization of effective maintenance and repair of machines. Further development of the work is to determine the significance of the level of qualification of specialists, the type of enterprise or workshop where the work can be carried out, and the level of their equipment with diagnostic and repair equipment. For a comprehensive comparative analysis of the significance of factors, multivariate analysis of variance can be applied.