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Improving the Performance of Pump-Controlled Circuits for Single-Rod Actuators

1
Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada
2
Dynamic Machine Corporation, Winnipeg, MB R2J 0H3, Canada
*
Author to whom correspondence should be addressed.
Actuators 2019, 8(1), 26; https://doi.org/10.3390/act8010026
Received: 18 January 2019 / Revised: 1 March 2019 / Accepted: 5 March 2019 / Published: 11 March 2019
Pump-controlled hydraulic circuits offer an energy-efficient solution for many applications. They combine the high power to weight ratio of hydraulic technology with the ease of control of electric technology. Pump-controlled circuits for double-rod cylinders are well developed as compared to those of single-rod cylinders. In spite of many initiatives, certain common pump-controlled single-rod cylinder solutions present stability issues during specific modes of operation. Common examples of the solutions are circuits that utilize pilot-operated check valves and circuits that use shuttle valves. In these circuits, velocity oscillations have been reported during actuator retraction at low assistive loads. In this paper, we study the area on the load-velocity graph of the available circuits where oscillatory behavior is experienced. We then propose a solution that shifts this critical zone towards lower loading values. This in turn reduces system response oscillations. Shifting the critical zone is accomplished by utilizing two charge pressures and asymmetric flow compensating valves. The concept is evaluated via simulations and experiments. Our results clearly show the enhanced performance of the circuits incorporating the proposed solution. View Full-Text
Keywords: pump-controlled actuation; single-rod actuator; asymmetric flow compensating valves pump-controlled actuation; single-rod actuator; asymmetric flow compensating valves
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Imam, A.; Rafiq, M.; Zeljko, T.; Sepehri, N. Improving the Performance of Pump-Controlled Circuits for Single-Rod Actuators. Actuators 2019, 8, 26.

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