Results 21 to 30 of about 3,832 (301)

Pump Up the Jam: Granular Media as a Quasi‐Hydraulic Fluid for Independent Control Over Isometric and Isotonic Actuation

open access: yesAdvanced Science, 2022
Elastomer‐granule composites have been used to switch between soft and stiff states by applying negative pressure differentials that cause the membrane to squeeze the internal grains, inducing dilation and jamming.
Shannon E. Bakarich   +5 more
doaj   +1 more source

Refined Modeling Method and Analysis of an Electromagnetic Direct-Drive Hydrostatic Actuation System

open access: yesActuators, 2022
The hydrostatic actuation system based on linear actuators improves the complex piston force and long transmission path of the traditional electro-hydrostatic actuator (EHA).
Jiayu Lu   +5 more
doaj   +1 more source

Conceptual Design of Electromechanical Actuation Systems for Large-Sized Directional Control Valves

open access: yesActuators, 2021
Increasing performance in modern hydraulics is achieved by a close investigation of possible enhancements of its components. Prior research has pointed out that electromechanical actuators can form suitable alternatives to hydraulically piloted control ...
Tobias Vonderbank, Katharina Schmitz
doaj   +1 more source

THE USE OF NUMERICAL ANALYSIS IN ORDER TO HIGHLIGHT THE FLUID DYNAMICS INSIDE A HYDRAULIC GEAR PUMP MODEL

open access: yesJournal of Industrial Design and Engineering Graphics, 2015
An experimental method for the investigation of hydraulic fluid flow inside a gear pump model was performed during this study. The external gear pump model was chosen because this volumetric unit is capable to take over the fluid at atmospheric pressure ...
Fanel Scheaua
doaj   +4 more sources

Motion synchronization for the SHA/EMA hybrid actuation system by using an optimization algorithm

open access: yesAutomatika, 2021
The current research develops a mathematical model and control strategies to address two major problems force fighting and precise position tracking for a hybrid actuation system composed of servo-hydraulic actuator and electro-mechanical actuator (SHA ...
Waheed Ur Rehman   +7 more
doaj   +1 more source

Integrated Parylene LC-ESI on a Chip [PDF]

open access: yes, 2005
In this thesis, several microfluidic devices will be introduced to demonstrate the integration capability of a multilayer parylene surface micromachining technology.
Xie, Jun
core   +1 more source

The key technologies of tiltrotor pylon conversion actuator

open access: yesHangkong gongcheng jinzhan
Tiltrotor which combines the advantages of helicopters and fixed wing aircraft,is a key direction for future aviation equipment development. The key component of tiltrotor-pylon conversion actuator is focused.
LI Hailin   +5 more
doaj   +1 more source

Highly-Integrated Hydraulic Smart Actuators and Smart Manifolds for High-Bandwidth Force Control

open access: yesFrontiers in Robotics and AI, 2018
Hydraulic actuation is the most widely used alternative to electric motors for legged robots and manipulators. It is often selected for its high power density, robustness and high-bandwidth control performance that allows the implementation of force ...
Victor Barasuol   +9 more
doaj   +1 more source

A piezoelectric microvalve for compact high frequency high differential pressure micropumping systems

open access: yes, 2003
A piezoelectrically driven hydraulic amplification microvalve for use in compact high-performance hydraulic pumping systems was designed, fabricated, and experimentally characterized. High-frequency, high-force actuation capabilities were enabled through
Steyn, J.L.   +6 more
core   +1 more source

Optimized design and performance testing of hydraulic electrostatic actuator

open access: yesInternational Journal of Smart and Nano Materials
Hydraulic electrostatic actuators have become a research hotspot for their inherent flexibility and safety of human-machine interaction. This paper aims to combine the characteristics of dielectric elastomers and fluid actuators, enhancing the dielectric
Yuze Ye   +7 more
doaj   +1 more source

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