Generally, the electro-hydraulic system (EHS) has force and position controls. The control of these parameters to the desired value multiple PID controllers are often used, which are sensitive to changes in system parameters. In addition, the existing EHS is often used as a single proportional direction control valve (PDCV) to control those parameters that cause loss and waste energy. Therefore, in this paper, a fuzzy controller is proposed to control force and position. Simultaneously, the EHS that is used for control will be added the inverter to adjust the speed of the electric motor (EM) to drive a fixed displacement gear pump, and a proportional pressure relief valve (PPRV), in order to save energy. A proposed fuzzy controller and the EHS are implemented to the hydraulic press. The experimental results showed that the hybrid of force and position control by using a fuzzy controller has a superior performance compared to the multiple PID controllers. Moreover, the proposed EHS is also more effective in saving power consumption than conventional EHS.
This paper presents a new approach for reducing energy consumption coupled with force and position controls in the electro-hydraulic systems (EHS). The EHS inverter will be added for control to vary the speed of electric motor driven hydraulic pump. In addition, a single directional control valve is used to control the system parameters, which cause loss of energy. The main objective of this research is to numerically analyze the energy loss in the new control approach in the EHS with the inverter by using a simple directional control valve. The spool displacements of 4/3 hydraulic closed center directional control valve, transient flow-pressure coefficient and energy loss were simulated with computational fluid dynamics (CFD). In addition, this paper presents CFD results. The relationships of flow rate variables with time-dependent pressure drop and energy loss were addressed. The flow behaviors related with transient flow-pressure coefficients were also discussed. It is found that the loss of energy increases, depending on both the large opening spool displacement and the inlet flow variable.
The objective of the present paper is a numerical analysis of the transient flow through a 4/3 hydraulic closed center direction control valve. The real-time discharge coefficients corresponding to supply flow difference have been considered. In order to develop an intelligent control system for an electro-hydraulic system (EHS), a new controller has recently been proposed to control those parameters in a complex system. However, a mathematical model of the EHS including the transient parameters has not been clarified. The main objective of this paper is to numerically analyze the dynamic characteristics of the directional control valve and also the flow behaviors in the electro-hydraulic system control. Both the steady state and transient flow though the valve which affect to flow-pressure coefficient were numerically considered. Moreover, this paper presents numerical results, which explain the flow behaviors related with the real-time pressure drop and discharge coefficient. Both a high inlet flow and a large opening spool have determined the pressure drop increment.
This paper presents a link between virtual and physical prototyping which was applied to the servo-pneumatic system. The development began with the study and design. Next, virtual prototyping, this stage is the integration of aided design, programming design, and simulation design to demonstration the functionality of the virtual servo-pneumatic prototype in a computer environment. After that, the virtual prototype which is verified and optimized to be used a physical prototyping. Finally, links the two together, this link represents be a human-machine interface system. The experimental results were satisfactory. Thus, may be said that this is both to enhance of the performance and efficiency of prototyping in current mechatronics system.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.