A rotary fluid power converter for improving energy efficiency of hydraulic system with variable load

Wu, Guoheng; Yang, Jian; Shang, Jianzhong; Fang, Delei

doi:10.1016/j.energy.2020.116957

Cited by 18 publications

(12 citation statements)

References 8 publications

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“…Simulated results showed good performance of the designed system. The simulated high and low pressures are 50 bar and 10 bar, and the experimental validation is needed [24]. Little work has been done to investigate the performance of SIHCs when they operate at high pressures and flow rates, both theoretically and experimentally.…”

Section: Previous Studies: Analytical Models and Experiments Investigamentioning

confidence: 99%

“…The model was validated in experiments with an operating pressure of 32 bar and very small flow rates. Wu et al developed a rotary hydraulic converter for variable load [24]. A new rotary module is designed as an inertia element for converter energy improvement.…”

Section: Introductionmentioning

confidence: 99%

“…Simulated results showed good performance of the designed system. The simulated high and low pressures are 50 bar and 10 bar, and the experimental validation is needed [24].…”

Section: Introductionmentioning

confidence: 99%

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Theoretical and Experimental Studies of a Digital Flow Booster Operating at High Pressures and Flow Rates

et al. 2020

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The switched inertance hydraulic converter (SIHC) is a new technology providing an alternative to conventional proportional or servo-valve-controlled systems in the area of fluid power. SIHCs can adjust or control flow and pressure by means of using digital control signals that do not rely on throttling the flow and dissipation of power, and provide hydraulic systems with high-energy efficiency, flexible control, and insensitivity to contamination. In this article, the analytical models of an SIHC in a three-port flow-booster configuration were used and validated at high operating pressure, with the low- and high-pressure supplies of 30 and 90 bar and a high delivery flow rate of 21 L/min. The system dynamics, flow responses, and power consumption were investigated and theoretically and experimentally validated. Results were compared to previous results achieved using low operating pressures, where low- and high-pressure supplies were 20 and 30 bar, and the delivery flow rate was 7 L/min. We concluded that the analytical models could effectively predict SIHC performance, and higher operating pressures and flow rates could result in system uncertainties that need to be understood well. As high operating pressure or flow rate is a common requirement in hydraulic systems, this constitutes an important contribution to the development of newly switched inertance hydraulic converters and the improvement of fluid-power energy efficiency.

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Section: Previous Studies: Analytical Models and Experiments Investigamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Theoretical and Experimental Studies of a Digital Flow Booster Operating at High Pressures and Flow Rates

et al. 2020

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“…Mainly with the objective to realize high switching frequencies and large flow rates, several groups tested rotary valves [20,21]. Such valves are bulky, costly and not merchantable, hence, do not solve the cost and availability problem.…”

Section: Introductionmentioning

confidence: 99%

The Hydraulically Controlled Oscillating Piston Converter

Scheidl

2021

Energies

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One way to realize inertia in energy saving hydraulic switching converters is a mechanical oscillator connected to a piston. Its two basic advantages over the use of fluid in an inductance pipe are higher compactness and a better decoupling of inductance and capacitance; these are opposed by a more complex valve system, which raises costs if electric control is applied. This paper presents and studies an oscillating mass converter with pure hydraulic control. It features a pressure control function and constitutes a step-up converter. A simple model is established to elucidate the basic properties of the function principle under idealized conditions. The complete system with the hydraulic control concept is studied by an elaborate dynamical model. It is shown that the converter is able to operate in the intended way under the conditions of the mathematical model. A potential application for a load sensing type meter out control of a cylinder drive is sketched.

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“…Nowadays, with the implementation of global energy conservation and emission reduction strategy, hydraulic transmission system is also required to improve efficiency, and increase flexibility and functionality [1,2]. Under this condition, as a power conversion unit, hydraulic transformer becomes an universally interesting topic due to the advantages of no throttling loss, energy saving and high efficiency [3,4].…”

Section: Introductionmentioning

confidence: 99%

Hydro-Dynamic Model and Low-Speed Stability Analysis of Hydraulic Transformer

et al. 2021

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Hydraulic transformer is a significant component to develop the future energy saving hydraulic systems; however, the speed stability is one of the problems in such a machine because the rotor is unconstrained and the rotary inertia of the rotor is small. In this paper, aiming at the rotating speed of hydraulic transformer, a hydro-dynamic model of is proposed considering the nonlinear friction, oil compressibility and leakage. Both simulation and experiment are carried out to validate the hydro-dynamic model. Moreover, this paper theoretically analyzes the low-speed stability of hydraulic transformer based on the hydro-dynamic model for the first time. The mechanism of creep is discussed and the creep judgment method is presented. The influence of each parameter on creep is investigated, and the possible ways to avoid creep are explored. The calculations of the lowest stable rotating speed and the lowest stable flow rate without creep are given. This study is significant for the design and practical application of hydraulic transformer in the future. INDEX TERMSHydraulic transformer; hydro-dynamic model; low-speed stability; creep

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A rotary fluid power converter for improving energy efficiency of hydraulic system with variable load

Cited by 18 publications

References 8 publications

Theoretical and Experimental Studies of a Digital Flow Booster Operating at High Pressures and Flow Rates

Theoretical and Experimental Studies of a Digital Flow Booster Operating at High Pressures and Flow Rates

The Hydraulically Controlled Oscillating Piston Converter

Hydro-Dynamic Model and Low-Speed Stability Analysis of Hydraulic Transformer

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