Assessment of the scope of application of modern timber road trains based on the analysis of their cross-country ability

Currently, single-unit logging road trains consisting of a truck and trailer are widely used in Russia for timber haulage. One of the key criteria for the high efficiency of logging transport systems in challenging natural and industrial conditions is ensuring their off-road capability. Logging vehicles primarily travel on public roads and forest transport routes with surfaces in satisfactory or good condition, where it is generally necessary to ensure adequate off-road performance, a key indicator of which is the adhesion weight ratio. The paper presents the results of a comparative analysis of the support-coupling cross-country ability based on the change in the value of the coefficient of adhesion weight of timber road trains-timber trucks assembled from vehicles (cars and trailers) of domestic production and imported ones, supplied by friendly countries. The relevance of the work is justified by the problems of operating "traditional" imported vehicles due to sanctions restrictions and the search for their effective replacement by timber road trains of domestic production and production of friendly countries. The analysis showed that at present the market offers a fairly large number of basic vehicles of domestic (KAMAZ, Ural, etc.), Belarusian (MAZ and MZKT) and Chinese (SITRAK, SHACMAN, etc.) production for assembling timber road trains during their operation in various road and production conditions. The main factors when choosing the configuration of timber road trains are the load capacity, the number of active axles of the base vehicle, the axle load, the length of the road train, etc. The assessment of the performance indicators and the efficiency of timber road trains made it possible, based on the values of the coefficient of adhesion weight and productivity at different haulage distances, to give recommendations on the assembly of timber road trains-timber trucks for different operating conditions. The material of the article can be useful for logging and transport companies, as well as for specialists conducting research in the field of timber removal.

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