Abstract
In this paper the principles and calculations of stretched in time graphic-analytical models of the operating network are proposed. They allow you to determine the sequence of logging operations at logging sites within the forest compartment, to reduce non-mechanical delay and increase technological efficiency of harvesting operations with fuzzy dynamic natural-production conditions. Search algorithm minimal cost flow developed to solve the proposed graphic-analytical model. It allows to justify the amount of expenses and calculate a maximum bandwidth of arcs between the fictitious source and drain of graphical model. The model differs complex use of two main characteristics of the process of logging operations: productivity and labor costs are presented as individual capacities of graph arcs. In order to solve the suggested graphic model, we developed the search algorithm of minimum cost flux, providing grounds for the typical expenditures and calculating the carrying capacity between the false source and runoff within the structure of suggested graphic models, different in two core characteristics of the logging process: productivity and labour inputs, represented as the carrying capacity of the graph arcs. The suggested graphical-analytic approach represents a certain task type of graph theory, according to which the transportation of flux along the dynamic operational network arcs reduces their carrying capacity. Every arc denotes analogous technological operations within the analysed time period. This is the distinctive feature of the suggested approach. The suggested design and calculation principles for time expanded graphical-analytical models of the operational network enable to provide rationale for the logging consequence and technological operations in fuzzy dynamic nature environment of a forest compartment, reduce operational downtime and enhance the efficiency of forest harvesting operations.
Highlights
It is well-known that selecting a set of machines when forming a park of timber harvesting equipment at a forest engineering enterprise should be based on the approach when the effective average of all the machines included into a system equals or divisible by the productivity of the leading machine
The nature working conditions in every harvesting area are significantly different from the analogous mean values within the enterprise
Any deviation of the nature working conditions in every harvesting area from the main values, characterizing the total felling-area resources of the enterprise result in inconsistent operation of the whole harvesting system. This problem may be partially mitigated, when a few areas are harvested in one forest compartment [05,06,07,08,09,10] based on sequencing feasibility and harvesting technique applied to each of them
Summary
It is well-known that selecting a set of machines when forming a park of timber harvesting equipment at a forest engineering enterprise should be based on the approach when the effective average of all the machines included into a system equals or divisible by the productivity of the leading machine. Any deviation of the nature working conditions in every harvesting area from the main values, characterizing the total felling-area resources of the enterprise result in inconsistent operation of the whole harvesting system This problem may be partially mitigated, when a few areas are harvested in one forest compartment [05,06,07,08,09,10] based on sequencing feasibility and harvesting technique applied to each of them. It should be taken into consideration, that in real working environment of harvesting areas such parameters as production of harvesting machines and prime costs of transportation and timber processing operations in ever-changing conditions of the environment can’t be certain in advance. The research aims to provide rationale to the operating procedures carried out in a forest compartment with integrated account taken of special factors relating to technological characteristics of the all the harvesting areas within the compartment
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