Trends in Design of Water Hydraulics-Motion Control and Open-Ended Solutions

Conrad, Finn

doi:10.5739/isfp.2005.420

Cited by 19 publications

(9 citation statements)

References 2 publications

(1 reference statement)

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“…In our previous study, it was shown that the ABW model is effective in representing the hysteresis of the muscle 16) . Equation (1) shows the discretized ABW model with time step k.…”

Section: Modeling Of Tap-water-driven Muscle and Estimation For Its P...mentioning

confidence: 99%

Precise Displacement Control of Tap-Water-Driven Muscle Using Adaptive Model Predictive Control with Hysteresis Compensation

Inada

Tsuruhara

Ito

et al. 2022

JFPS International Journal of Fluid Power System

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The McKibben-type artificial muscle has been applied to several industrial fields because of its many advantages over traditional actuators, including, high flexibility, low weight, and high power density. However, the muscle has strong asymmetric hysteresis characteristics that are dependent on the load applied, and these problems prevent its widespread application. This study presents an approach to model hysteresis characteristics of the muscle using an asymmetric Bouc-Wen model. Subsequently, control strategies based on several model predictive control, including servomechanism and adaptive algorithm, and a combination of these methods, were applied to the proposed model. Experimental results revealed that model predictive control with servomechanism showed robustness in terms of load and small variation for control performance. Furthermore, the adaptive model predictive control with servomechanism improved control performance in the steady-state response by 46% compared with the model predictive control with servomechanism and demonstrated robustness in terms of changes in the reference frequency.

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“…In our previous study, it was shown that the ABW model is effective in representing the hysteresis of the muscle 16) . Equation (1) shows the discretized ABW model with time step k.…”

Section: Modeling Of Tap-water-driven Muscle and Estimation For Its P...mentioning

confidence: 99%

Precise Displacement Control of Tap-Water-Driven Muscle Using Adaptive Model Predictive Control with Hysteresis Compensation

Inada

Tsuruhara

Ito

et al. 2022

JFPS International Journal of Fluid Power System

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“…The swashplate has an inclination angle which defines the stroke of the pistons. The theoretical flow of the pump is worked out with the piston area, stroke of the pistons, number of the pistons and the rotation speed of the cylinder block [8][9][10][11][12]. The valve plate realizes the connection of the piston chambers to the suction and pressure ports.…”

Section: Fig1 Water Hydraulic Axial Piston Pumpmentioning

confidence: 99%

Research of Water Hydraulic Components and Systems from Aspects of Quality of Life

Todić¹,

Savić²,

Jovanović³

et al. 2019

Applied Engineering Letters

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This article describes the importance of water hydraulic components and systems from the aspect of quality of life. Water hydraulics has become of major interest because it is human friendly and environmentally safe. The continuous introduction of new materials and technologies in the production of components and systems of water hydraulics ensures the increasing application of these systems.The most important component of a water hydraulic system is the pump. Research of piston axial water hydraulic pumps is presented in this paper. A test stand was developed to validate the computational fluid dynamics simulations for the water hydraulic axial piston pump.

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“…Past two decades, in order to meet the demand of economic development and environmental protection, pure water hydraulic systems has been applied in food industry, steel mills, nuclear engineering, and desalination plants because pure water is environmentally friendly, non-toxic, non-flammable and cost-effective (Lim et al, 2003;Conrad, 2005). Ceramic materials are thought of the suitable materials in the water hydraulic systems.…”

Section: Introductionmentioning

confidence: 99%

On frictional performance of sintering materials used by mechanical seals in water

Liu

Zhao²,

Wen³

et al. 2014

Industrial Lubrication and Tribology

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Purpose -It is aiming at finding tribology performance laws and mechanism of sintering materials, including new materials, which are popular or potential materials of mechanical seals working under water condition with different working parameters, involving load and sliding speed. Design/methodology/approach -Falex-1506 tribo-machine has been used. The upper sample is rotated against the stationary sample below. They are all rings. The samples are WNV2, sintered pressureless bonded; CHV1, graphite-added PLSiC; R, sintered reaction bonded; R2, graphite-added RBSiC, cemented carbide YN6 and graphite MSMG. Twenty kinds of hard/hard and soft/hard pairs were tested under water condition. Then, SEM was used to observe the sliding surface to explain their rubbing mechanism. Findings -Friction coefficients decrease with the load increasing under water lubrication due to water holding by small holes on their surface. But the friction coefficients have no change with the varying of velocity. The hard alloy/sintered silicon carbon pairs may be better choice, where the lowest friction coefficient is only about 0.02, than soft/hard or silicon carbon/silicon carbon pairs under water lubrication, especially under heavy load.Research limitations/implications -The test was carried under load from 89 N (0.7 MPa) to 356 N (2.80 MPa) and sliding velocity from 0.746 to 5.074 m/s where the lubrication is in mixed. Originality/value -The detailed values of frictional coefficients of popular and potential sintered material of mechanical seals working under water lubrication were given by the experimental research which may be helpful for the choice of mechanical seal materials.

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Trends in Design of Water Hydraulics-Motion Control and Open-Ended Solutions

Cited by 19 publications

References 2 publications

Precise Displacement Control of Tap-Water-Driven Muscle Using Adaptive Model Predictive Control with Hysteresis Compensation

Precise Displacement Control of Tap-Water-Driven Muscle Using Adaptive Model Predictive Control with Hysteresis Compensation

Research of Water Hydraulic Components and Systems from Aspects of Quality of Life

On frictional performance of sintering materials used by mechanical seals in water

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