Calculation of spectral densities of transmission elements of a forestry tractor

The issue of predicting the reliability and service life of forestry tractors, their individual components and assemblies is an urgent task at the design stage and the operation of this equipment. Considering that at the moment in the forestry industry the largest number of forestry tractors carry out transport operations, breakdowns are largely associated with transmission elements. The difficult operating conditions of forestry tractors and the cyclical load changes lead to an increase in the dynamic coefficient, which significantly affects the durability of transmission parts. As a result of the study of literary sources it has been established that the use of spectral densities has become widespread in the analysis of reliability as separate elements of power transmission and the transmission as a whole. The study presents a methodology, describes the expressions and their interpretation, as well as simplifications and derivations of final expressions for determining the spectral densities of the transmission elements of wheeled forestry tractors, which can be used when performing calculations to determine the durability and loading of transmission parts, as well as planning and developing methods for accelerated, including bench tests of transmissions of wheeled forestry tractors and their individual components and assemblies.