System analysis of the wheel forwarder’s technological efficiency on the unloading operation
The use of system analysis in assessing the technological efficiency of forestry machines allows you to obtain a more informational picture of production compared to existing averages. This allows you to more reliably solve optimization problems during the formation of the technological process and its control. Many operations carried out in logging production (cutting operations, delimbing operations, logging operations, loading, skidding, saving operations, timber transportation, etc.) are carried out by the corresponding many machines existing in the forest engineering market. The system approach to production processes is based on a mathematical model for constructing a single functional space-time connectivity for them, in which the objective function is performed. From the point of view of the theory of systems in the forest industry, various spatial-temporal structural levels of production connectivity can be formulated: a timber industry (macro), forestry (meso) and operations (micro). The task of this study, using the example of the operation «unloading», as a representative of the micro-space-time structure of production, is to present a system mathematical model of the connectivity of suboperations performing their target functions in a single functional space-time of the production cycle. The "unloading" operation is a system of sequentially performed separate suboperations (manipulator operation, transitions, formation of a lining for the stack, etc.), the performance of which is determined not only by the time of its execution, but also by the time of content of gradients in the hopper until full unloading. From the system approach position, the unloading operation is combined with the saving operations of the sortiments to identify the system connectivity of the subsequent operation to the previous one and their unified representation.