Gradeability of a Forwarder Based on Traction Performance

Based on the knowledge of dimensional and mass features a forwarder, model was developed to assess its mobility during timber forwarding uphill in safe eco-efficient way. The is based position forwarder’s centre gravity, declared payload length loaded timber, as well gradeability for traction characteristics vehicle. connects two research approaches, (1) vehicle–terrain approach (distribution axle loads depending longitudinal terrain slope) (2) wheel–soil (estimation forwarder wheel numeric), concerning previous research: (i) underload front vehicle, (ii) overload rear (iii) permissible tire load, (iv) minimal soil bearing capacity, (v) slip. Simulation modelling assessment forwarders’ range conducted an example eight-wheel Komatsu 875 with 16,000 kg, equipped 710/45-26.5 tires, which gravity determined by method lifting axle. results distribution adhesion load axles indicated that, kg 4.82 m long hardwood logs slope below 68%, there no critical unloading bogie axle, nor overloading i.e., that could limit mobility. For specified slope, cone index 950 kPa exemplary environmental factor calculated nominal ground pressure reference (heavier loaded) wheels intersection curves (based at slip 25% vs. index) curve index.