A Low-Cost Miniature Electrohydrostatic Actuator System

Wiens, Travis; Deibert, Brendan

doi:10.3390/act9040130

Cited by 9 publications

(13 citation statements)

References 18 publications

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“…This valve connects the cylinder port with the lower pressure to the lowpressure supply. For testing purposes, this low pressure was supplied by an external pump, but it is believed that it would be possible for this to be replaced with a reservoir or accumulator [13]. The valve casing was 3D-printed from polyethylene terephthalate glycol-modified (PETG) using a Prusa i3 mk3 fused filament printer, at a layer height of 0.10 mm and 100% infill.…”

Section: System Descriptionmentioning

confidence: 99%

“…A previous paper [13] evaluated the steady state performance of the system and found it to have a very high specific force and power when compared to electrical actuators.…”

Section: System Descriptionmentioning

confidence: 99%

“…Assuming constant effective bulk modulus, , in the fluid and containing passageways, continuity requires Table 1 shows parameters used for the simulation study, some of which were experimentally estimated in a previous work [13].…”

Section: Dynamic Modelmentioning

confidence: 99%

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A Low-Cost Miniature Electrohydrostatic Actuator

Wiens

2020

The 1st International Electronic Conference on Actuator Technology: Materials, Devices and Applications

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This paper presents a low-cost, small-scale, electrohydrostatic actuator (EHA). This actuator leverages low-cost, mass-produced hydraulic components from the radio-controlled model industry, combined with a novel 3D printed valve. The system is capable of relatively high bandwidth operation, with much higher power-and force-density than comparable electrical actuators. This paper presents a dynamic system model, investigating the range of stability.

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Section: System Descriptionmentioning

confidence: 99%

“…A previous paper [13] evaluated the steady state performance of the system and found it to have a very high specific force and power when compared to electrical actuators.…”

Section: System Descriptionmentioning

confidence: 99%

See 1 more Smart Citation

A Low-Cost Miniature Electrohydrostatic Actuator

Wiens

2020

The 1st International Electronic Conference on Actuator Technology: Materials, Devices and Applications

Self Cite

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“…Considering drive and systems technology based on variable-speed displacement units, major focus has been placed on their application to differential cylinders for use in both industrial and mobile applications, with special emphasis on standalone cylinder drives, and the handling of the volume asymmetry in various ways. Here, developments encompassing single displacement unit drives [16][17][18][19][20][21][22][23], dual displacement unit drives [24][25][26][27][28][29] and even triple displacement unit drives [30][31][32], all utilizing a single electric motor have been considered. Furthermore, dual displacement unit drives with two motors have also been considered [33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Electro-Hydraulic Variable-Speed Drive Networks—Idea, Perspectives, and Energy Saving Potentials

Schmidt

Hansen²

2022

Energies

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Electro-hydraulic differential cylinder drives with variable-speed displacement units as their central transmission element are subject to an increasing focus in both industry and academia. A main reason is the potential for substantial efficiency increases due to avoidance of throttling of the main flows. Research contributions have mainly been focusing on appropriate compensation of volume asymmetry and the development of standalone self-contained and compact solutions, with all necessary functions onboard. However, as many hydraulic actuator systems encompass multiple cylinders, such approaches may not be the most feasible ones with respect to efficiency or commercial feasibility. This article presents the idea of multi-cylinder drives, characterized by electrically and hydraulically interconnected variable-speed displacement units essentially allowing for completely avoiding throttle elements, while allowing for hydraulic and electric power sharing as well as the sharing of auxiliary functions and fluid reservoir. With drive topologies taking offset in communication theory, the concept of electro-hydraulic variable-speed drive networks is introduced. Three different drive networks are designed for an example application, including component sizing and controls in order to demonstrate their potentials. It is found that such drive networks may provide simple physical designs with few building blocks and increased energy efficiencies compared to standalone drives, while exhibiting excellent dynamic properties and control performance.

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“…28 Printing of complex, light hydraulic parts became a reality in much less time than before. As an example, Wiens and Deibert 29 presented a miniature hydraulic actuator with a low-cost 3D-printed valve. It was able to produce high force density and is cheaper in cost than other similar electric actuators.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of an integrated electro-hydraulic actuator using dynamic modeling and optimization

Amrollah¹,

Abdellatif

Alfayad

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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For robotic applications, hydraulic actuation is still an open research issue. A hydraulic actuation solution based on integrated hydraulics is presented in the form of an integrated electro-hydraulic Actuator (IEHA). This actuator tackles some issues related to compactness and self-contained autonomous robotic systems. One of its primary uses is the actuation of the hydraulic humanoid robot HYDROïD. Primary experimental validation of the IEHA actuator has suffered from several low-performance issues. The main reason for such performance is due to that inner friction forces and leakage losses were not addressed or modeled yet. In this paper, a detailed dynamic model of the IEHA actuator is needed to identify the mechanical components that affect the volumetric and mechanical efficiencies of the actuator. The dynamic model focuses on the dynamics of essential parameters and components like the micro-pump pistons, their internal leakage, and friction during actuation. The design parameters of these mechanical parts are optimally calculated to produce a new enhanced dynamic model. The new IEHA model is verified through simulation to actuate the ankle pitch rotation of the robot. A genetic algorithm is used to optimize the geometrical and design parameters while enhancing the overall mechanical and volumetric efficiencies of the IEHA. The IEHA model was able to generate a locomotion gait cycle successfully for a walking speed of 1.17 m/s. Simulation results have shown that the design enhancements led to 95% and 97% volumetric and mechanical efficiencies respectively. Finally, the new enhanced IEHA prototype is tested experimentally. The output flow of the new prototype has improved by approximately 58%.

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A Low-Cost Miniature Electrohydrostatic Actuator System

Cited by 9 publications

References 18 publications

A Low-Cost Miniature Electrohydrostatic Actuator

A Low-Cost Miniature Electrohydrostatic Actuator

Electro-Hydraulic Variable-Speed Drive Networks—Idea, Perspectives, and Energy Saving Potentials

Performance enhancement of an integrated electro-hydraulic actuator using dynamic modeling and optimization

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