engleski

Potential Use of Novel Efficient Direct Driven Electro-Hydraulic System for Skidders

Nowadays there are increasing demands in terms of reducing the cost of running forestry machines along with the regulatory pressures for lower exhaust emissions to improve the ecological indices and reduction of acoustic noise in order to comply with increasingly more stringent industry ergonomic guidelines. Therefore, the producers of forestry equipment are increasingly interested to make such heavy machinery more efficient, which can already be seen with the emergence of certain hybrid and electric powertrain-based forestry vehicles. However, many tools and accessories used by these heavy vehicles are still powered by hydraulics systems. For example, articulated forestry tractor known as skidder uses hydraulic steering, hydraulic lifting for front pushing plate or rear protection plate, and also uses a hydraulic double-drum winch. Having this in mind, this paper investigates the possible use of direct driven electro-hydraulic system instead of the classical one in order to increase the skidder’s operating efficiency. Both the classical and direct driven electro-hydraulic systems are modeled, simulated and experimentally verified for the purpose of comparative analysis of their efficiency. Experiments are carried out under laboratory conditions and experimental results are obtained both for the unloaded cylinder and different payloads. The obtained simulation results are used to gain insights about the possible advantages of the directly driven electro-hydraulic system.

Hydraulics systems, forestry tractor, skidder, efficiency

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