Results 21 to 30 of about 845 (196)

Low-Level Force-Control of MR-Hydrostatic Actuators

IEEE Robotics and Automation Letters, 2021
Precise and high-fidelity force control is critical for new generations of robots that interact with humans and unknown environments. Mobile robots, such as wearable devices and legged robots, must also be lightweight to accomplish their function. Hydrostatic transmissions have been proposed as a promising strategy for meeting these two challenging ...
Jeff Denis, Jean-Sebastien Plante, Alexandre Girard   +2 more
openaire   +2 more sources

Qualitative and quantitative analysis of the reliability of NPC and ANPC power converters for aeronautical applications

Alexandria Engineering Journal, 2022
In more electrical aircraft, most flight control wing surface actuators are either electro-hydrostatic or electro-mechanical, whether in manual or autopilot mode.
Reda Dermouche, Abderrahmane Talaoubrid, Linda Barazane, Yamine Sellami, Mohamed Tadjine, Nadjet Zioui   +5 more
doaj   +1 more source

Variable displacement electro-hydrostatic actuator [PDF]

Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991, 2002
The author discusses the effects of pump displacement on electro-hydrostatic actuator (EHA) performance characteristics and the possible advantages of using a variable displacement pump in an EHA. Issues discussed are heating, size, and stiffness.
openaire   +1 more source

A NUMERICAL AND EXPERIMENTAL ANALYSIS OF THE DYNAMIC STABILITY OF HYDRAULIC EXCAVATORS

Facta Universitatis. Series: Mechanical Engineering, 2018
The paper presents the results of a numerical and experimental analysis of the dynamic stability of hydraulic excavators. The analysis has employed the software developed on the basis of a defined general dynamic mathematical model of an excavator ...
Dragoslav Janošević, Jovan Pavlović, Vesna Jovanović, Goran Petrović   +3 more
doaj   +1 more source

Experimental Investigation of an Electro-Hydrostatic Actuator Based on the Novel Active Compensation Method

IEEE Access, 2020
For electro-hydrostatic actuators (EHAs), how to estimate and compensate for the combined effects of the severe nonlinearity caused by inner leakage and friction, the parametric uncertainties of the hydraulic components due to the environment and the ...
Mingkang Wang, Yan Wang, Yongling Fu, Rongrong Yang, Jiang'ao Zhao, Jian Fu   +5 more
doaj   +1 more source

Energy management in pump-controlled actuators

Frontiers in Mechanical Engineering
Pump-controlled actuators, or more generically, hydrostatic actuators, have the significant advantage of not relying on valves to control the cylinders. This results in much better energy usage compared to traditional valve-controlled systems.
Gustavo Koury Costa, Nariman Sepehri
doaj   +1 more source

Media-Free and Contactless Micro-Positioning System Using Ultrasonic Levitation and Magnetic Actuators

Actuators
In micro-production technology (MPT), the demand for ultra-precise machine tools has been steadily increasing. Conventional guideway systems, such as hydrostatic or aerostatic bearings, often face limitations in terms of compactness, media supply, and ...
Berend Denkena, Jörg Wallaschek, Henning Buhl, Jens Twiefel, Chenglong Ding, Zijian Chen   +5 more
doaj   +1 more source

Nonlinear Position Control with Nonlinear Coordinate Transformation Using Only Position Measurement for Single-Rod Electro-Hydrostatic Actuator

Mathematics, 2020
In existing methods, full-state feedback is required for the position tracking of single-rod Electro Hydrostatic Actuators (EHAs). Measuring a full state is not always possible because of cost and space limitations.
Wonhee Kim, Daehee Won
doaj   +1 more source

Spin Defects in Hexagonal Boron Nitride as 2D Strain Sensors

Advanced Functional Materials, EarlyView.
We demonstrate that boron‐vacancy (VB${\rm V}_{\rm B}$) centers in hexagonal boron nitride (hBN) enable quantitative strain sensing with sub‐micrometer resolution. Using this approach under continuously tunable in‐plane stress, we precisely quantify strain‐induced shifts of the E2g${\rm E}_{2{\rm g}}$ Raman mode in multilayer hBN, establishing VB${\rm ...
Zhao Mu, Zhaowei Zhang, Jules Fraunié, Cédric Robert, Grégory Seine, Bernard Gil, Guillaume Cassabois, Vincent Jacques   +7 more
wiley   +1 more source

Design and Performance Study for Electrothermally Deep-Sea Drive Microunits Using a Paraffin Phase Change Material

Micromachines, 2021
Considering the further exploration of the ocean, the requirements for deep-sea operation equipment have increased. Many problems existing in the widely used deep-sea hydraulic system have become increasingly prominent. Compared with the traditional deep-
Dayong Ning, Zihao Li, Gangda Liang, Qibo Wang, Weifeng Zou, Yongjun Gong, Jiaoyi Hou   +6 more
doaj   +1 more source