Abstract
The switched inertance hydraulic system (SIHS) is a novel high-bandwidth and energy-efficient digital device which can adjust or control flow and pressure by a means that does not rely on throttling the flow and dissipation of power. An SIHS can provide an efficient step-up or step-down of pressure or flow rate by using a digital control signal. In this article, analytical models of an SIHS in a four-port high-speed switching valve configuration are proposed, and the system dynamics and performance are investigated theoretically and experimentally. The flow responses, system characteristics, and power consumption can be predicted effectively and accurately by using the proposed models, which were validated by comparing with experiments and with numerical simulation. The four-port configuration is compared with the three-port configuration, and it is concluded that the former one is less efficient for valves of the same size, but provides a bi-direction control capability. As bi-direction control is a common requirement, this constitutes an important contribution to the development of efficient digital hydraulics.
Highlights
The speed or force of a hydraulic system is usually controlled by using hydraulic valves to throttle the flow and reduce the pressure
The experimental tests of the switched inertance hydraulic system (SIHS) are performed with a supply pressure of 35 bar which is below the industrial hydraulic requirements [7]
The analytical model effectively predict dynamic rate which a novel tool for we are confident in using thecan simulated flow ratesthe here as theflow simulated andgives experimental pressures investigating an SIHS from the fundamental viewpoint without the necessity of creating numerical agreed very well as shown in Figure 7, which indicates that the simulation is able to represent the simulation models requiring a long computation time
Summary
The speed or force of a hydraulic system is usually controlled by using hydraulic valves to throttle the flow and reduce the pressure. The mixed time-frequency domain model of a hydraulic valve switches from the open position to the closed position, the flow rate is drawn by the momentum inductance pipe with a check valve is proposed by Scheidl and Manhartsgruber [13]. The analytical models of an in a four-port high-speed switching valve configuration are proposed, and the system dynamics and performance are investigated theoretically configuration are proposed, and the system dynamics and performance are investigated theoretically and experimentally. The analytical models help to understand the physical characteristics of switched hydraulics and allow the effect of system parameter changes to be investigated.
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