Main Article Content
A design and mathematical modeling of a hydraulic pressure converter with a conventional hydraulic transformer working with a high-speed on-off valve is presented in this paper. The goal of the research is to increase the load pressure range by utilizing the motor to pump displacement ratio within the hydraulic transformer and system flow rate controlling of an on/off valve with the duty ratio. A throttle valve is also used to simulate the load pressure. For mathematical modeling, pressure drop across an on/off valve is considered. While, a pump and motor can be analyzed with ideal equations. Therefore, duty ratio, motor to pump displacement ratio and pressure drop effect the equivalent load pressure and the fluctuation magnitude. As a result from a steady state analysis, it has been found that wider equivalent load pressure range can be achieved by increasing the motor to pump displacement ratio. In addition, the magnitude of fluctuation is highest at the duty ratio of 0.6. For effect of the pressure drop, it reduces the load pressure linearly with the duty ratio. Nevertheless, it has been found from the transient analysis that increasing the motor to pump displacement ratio by increasing the motor displacement results in reducing settling time but fluctuation is increased. On the other hand, by reducing the pump displacement, the settling time is increased but fluctuation is decreased.
 Katz AA, Van de Ven JD. Design of a high-speed on-off valve. Proceeding of International Mechanical Engineering Congress & Exposition,. 2009; 11189
 Jeong HS, Kim HE. Experimental based znalysis of the pressure control characteristics of an oil hydraulic three-way on/off solenoid valve controlled by PWM signal, Journal of Dynamic Systems, Measurement, and Control. 2001; 124(1): 196-205.
 Ouyang X, Yang H, Jiang H, Xu B. Simulation of the piezoelectric high-speed on/off valve, Chin. Sci. Bull. 2008; 53(17): 2706-2711.
 Passarini LC, Nakajima PR. development of a high-speed solenoid valve: an investigation of the importance of the armature mass on the dynamic response, Journal of the Brazilian Society of Mechanical Sciences and Engineering. 2003; 25(4): 329-335.
 Rannow MB, Tu HC, Li PY, Chase TR. Software enabled variable displacement pumps - Experimental studies. Proceeding of American Society of Mechanical Engineers, The Fluid Power and Systems Technology Division, FPST, Chicago, Illinois, USA, November 5 – 10. 2006; 67-76.
 Van de Ven JD. On fluid compressibility in switch-mode hydraulic circuits—Part I: modeling and analysis, Journal of Dynamic Systems, Measurement, and Control. 2012; 135(2): 021013_021011-021013_021013.
 Feng W, Linyi G, Ying C. A hydraulic pressure-boost system based on high-speed on-off valves, Mechatronics, IEEE/ASME Transactions on. 2013; 18(2): 733-743.
 Lee S, Li PY. Trajectory tracking control using a hydraulic transfermer. Proceeding of International Symposium on Flexible Automation, Awaji-Island, Hyogo, Japan, 14-- 16 July. 2014.
 Lee S, Li PY. Supervisory control for a switched mode hydraulic transformer. Proceeding of BATH/ASME 2018 Symposium on Fluid Power and Motion Control, September 12–14. 2018; V001T001A065.
 Vael GE, Achten PA, Fu Z. The innas hydraulic transformer the key to the hydrostatic common pressure rail, (SAE Technical Paper. 2000; edn.).
 Achten PA, Fu Z, Vael G. Transforming future hydraulics: a new design of a hydraulic transformer. Proceeding of The Fifth Scandinavian International Conference on Fluid Power, SICFP, Sweden. 1997; 1-23.
 Shen W, Jiang J, Su X, Karimi HR. Angle displacement robust controller for the port plate of the hydraulic transformer, Mathematical Problems in Engineering. 2013.