Mathematical modelling and numerical simulation of linear electro-hydraulic servomechanism with stepper motor

The paper presents the results of research on the performance of linear electro-hydraulic servomechanisms with stepper motor, evaluated by mathematical modelling and numerical simulation with the AMESIM software package. These servomechanisms have a great potential for application, including for agricultural technical equipment. Servomechanisms of various types are used for the rapid and high precision operation of the various systems. In practice, electro-hydraulic servomechanisms have been required in the case of the systems requiring high forces or moments. These equipment are automatic hydraulic tracking systems and can be analysed with methods specific to automatic systems. The paper contains a structural description of an electro-mechanical servomechanism with stepper motor, its operation, mathematical model and its performances obtained by numerical simulation. The mathematical modelling of the electro-hydraulic servomechanism is based on the relations between the input sizes and output sizes of the equipment in its structure as well as the connection relations between these equipment. Based on the obtained results it is demonstrated that the analysis and synthesis of electro-hydraulic servomechanisms with stepper motor can be determined by numerical simulation using the AMESIM simulation software

Neuro-fuzzy control synthesis for hydrostatic type servoactuators. Experimental results

Continuing recent works of the authors, the paper shows the developing and the application of aneuro-fuzzy control law to the positioning outer loop of a hydrostatic type servoactuator.Experimental results are presented concerning dynamical behavior of the system by using this“intelligent” controller. Finally, arguments about the advantages of the new designed controller aresummarized