Received: 02-01-2018 / Accepted: 04-04-2018
The use of a combination of loggers on sloping forest land is common and necessary in northern provinces of Vietnam. It requires safety for people and equipment during operation. The article presents an option for controlling the hydraulic system that holds the timber logger on the sloping land. System pressure can be kept almost unchanged, regardless of the machine's motion condition by automatically controlling the volume of the pump. The authors performed the simulation using MATLAB/Simulink software based on the required data. The operating and control properties of the system indicate that the torsion force is small when the machine speed varies from 0 to 1.7 m/s, the power loss and the duration are not significant. This provides a theoretical basis for the practical application of the system.
