Digital Hydraulic Pump: an energy efficiency study

Silva, Dimitri Oliveira e; Carvalho, Luiz Alexandre Barros de; Negri, Victor Juliano De; Waltrich, Gierri

doi:10.26678/abcm.cobem2021.cob2021-1613

Cited by 2 publications

(3 citation statements)

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“…Speed control is performed by the combination of the angular speed source and pump unit. According to [8], the use of the variable speed increases the number of different flow rates of the DHP, which becomes a continuous flow rate source and allows using the power-on-demand concept to adjust the angular speed for each pump unit combination. This strategy aims to achieve the best operating point for each work condition.…”

Section: Variable Speed Digital Electro Hydrostatic Actuator (Vsdeha)mentioning

confidence: 99%

“…The use of a variable speed digital hydraulic pump is justified by the possibility of changing the pump unit combination to supply a certain operation point or flow rate range without sacrificing efficiency [8]. For example, under low demand conditions, the smaller pump unit can be used more efficiently to supply the low flow rate demand, and under high demand conditions, the higher pump unit combination can be used to achieve this point.…”

Section: Variable Speed Digital Electro Hydrostatic Actuator (Vsdeha)mentioning

confidence: 99%

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Digital Hydraulic Actuators: An Alternative for Aircraft Control Surfaces

Silva

Nostrani

Lopes

et al. 2023

Linköping Electronic Conference Proceedings

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In the last decades, digital hydraulics has emerged as a new alternative for the development of more efficient hydraulic systems, where the effects of throttling losses and internal leakages are minimized through the use of conventional hydraulic components associated in parallel or through switching hydraulics. In the aviation industry, hydraulic systems are commonly applied to control highly relevant systems, such as landing gear and flight control surfaces. In this context, digital hydraulics can be used as an alternative solution to improve the energy efficiency of aircraft hydraulic systems. Based on that, this paper aims to present three new hydraulic actuators for application on aircraft flight control surfaces using digital hydraulics. The actuators are being studied by the Laboratory of Hydraulic and Pneumatic Systems - LASHIP of the Federal University of Santa Catarina - UFSC and are called Digital Hydraulic Actuator - DHA, Digital Electro Hydrostatic Actuator - DEHA and Variable Speed Digital Electro Hydrostatic Actuator - VSDEHA. The simulation results show that the actuators developed can be 23 times more efficient than conventional servo-hydraulic actuators, with equivalent dynamic characteristics, demonstrating the potential for application of these new actuators in aeronautical systems.

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Section: Variable Speed Digital Electro Hydrostatic Actuator (Vsdeha)mentioning

confidence: 99%

Section: Variable Speed Digital Electro Hydrostatic Actuator (Vsdeha)mentioning

confidence: 99%

Digital Hydraulic Actuators: An Alternative for Aircraft Control Surfaces

Silva

Nostrani

Lopes

et al. 2023

Linköping Electronic Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…One option is the development of new pumps and motors, such as the Digital Displacement Pump ® (DDP) [5]. Another research topic is reducing the system losses by modifying the conventional system [2,4] or by exploring new architectures that aim at reducing the losses in hydraulic systems by changing the throttling valves to a series of on/off valves to operate the actuators [6,7] and that take advantage of the higher control capabilities of a combined electrichydraulic system by controlling the pump speed, and thus the flow [8].…”

Section: Introductionmentioning

confidence: 99%

A Novel Multi-Pump System for Hydraulic Actuation in Electric Mobile Machinery

Gama

Heybroek

Ericson

2023

Linköping Electronic Conference Proceedings

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An observable trend nowadays is the change in the prime movers of mobile heavy machinery to electric alternatives to achieve more eco-friendly equipment. These solutions often require large and heavy batteries with limited capacity, making the research of more efficient components and the development of different system architectures an important topic of study. Hydraulic actuation is still a relevant application for these vehicles because of its reliability, controllability, and high power density. The electrification and digitalization of mobile machinery allow for innovative designs and control strategies to be implemented that take advantage of electro-hydraulic systems and their characteristics. Similar research has shown that a higher number of degrees of freedom allow for the system to operate with higher total efficiency. This paper introduces a novel actuation architecture that combines multiple fixed displacement hydraulic pumps and on/off directional valves to control the position and force of two hydraulic actuators for the working functions of a mobile machine. Each pump is powered by a variable speed electric drive so that each one can be operated independently, and together with the set of directional valves, allows the selection of different combinations of pumps and flow sharing between the actuators’ chambers to achieve the desired flow and pressure on each cylinder. The multi-pump system favours the use of smaller pumps, and the possibility of combining their flows reduces the need to operate the components at lower efficiency points such as partial displacement. At the same time, controlling the pumps’ flow through the variable-speed electric motors means that throttling valves are not needed. The development of this architecture will allow for its use in mathematical models to analyse its behaviour and efficiency and to obtain insights regarding points of improvement in the system architecture.

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Digital Hydraulic Pump: an energy efficiency study

Cited by 2 publications

References 0 publications

Digital Hydraulic Actuators: An Alternative for Aircraft Control Surfaces

Digital Hydraulic Actuators: An Alternative for Aircraft Control Surfaces

A Novel Multi-Pump System for Hydraulic Actuation in Electric Mobile Machinery

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