Development of BLDC Electric Motor Control System In Hydraulic Servo Drive Based on Variable Hydrostatic Transmission
Engineering Education # 12, December 2014
Identification of mathematical model parameters of an electro-hydraulic drive
Engineering Education # 06, June 2013
This paper presents a method of identifying parameters of a mathematical model of an electrohydraulic drive. The method is based on comparison of the characteristics obtained during an experiment, and of the characteristics obtained by simulation. A criterion of identity was formed for this case. A search algorithm was built with the use of the Nelder-Mead method for numerical minimization. A mathematical model of an electro-hydraulic drive was presented. The author considers influence of quality of manufacturing spool valves on characteristics of electro-hydraulic drives. Conclusions on effectiveness of the proposed method were drawn.
Hydroelectric drive with throttle control with enhanced energy efficiency
Engineering Education # 10, October 2012
The paper describes the construction diagram of a hydroelectric drive with throttle control. The authors consider an algorithm for controlling the drive, which increases its efficiency. They provide a mathematical model of the drive. The authors propose an algorithm for synthesis of the control signal; the algorithm is based on applying the method of modified Lagrange function for constrained minimization. As a criterion to be minimized the authors selected the flow rate of the pumping station subject to the minimum unevenness of rotational velocity of the output link of the drive. Calculation of points for optimization was performed by the numerical solution of equations for a mathematical model. The modeling resulted in control algorithm that significantly improved energy efficiency of the drive.
77-30569/354657 Creating parameterized 3D-models of the flow part in centrifugal pumps
Engineering Education # 04, April 2012
The article describes a new method of automated building parameterized 3D-models of centrifugal pumps. The purpose of modeling is to provide source data for optimization of air-gas channels in type HM pumps by hydrodynamic simulation methods. The first element to be optimised was a volute pump. The algorithm for constructing 3D-models of the discharge device is based on the Bezier curves. Basing on the basic geometrical parameters of the drain, the proposed method allows to automatically create its geometry in the most popular graphics packages SolidWorks and CATIA, and to export the package simulation STAR CCM +.