Results 41 to 50 of about 117 (107)

Advances and Prospects in Fault Diagnosis of Aircraft Hydraulic Piston Pumps

Shock and Vibration, Volume 2025, Issue 1, 2025.
The hydraulic system is a crucial system for aircraft. As the core power component of the hydraulic system, the hydraulic pump has a complex structure and operates in a harsh environment. Therefore, fault diagnosis of the hydraulic pump is of great significance and highly challenging.
Peng Lin, Yuting Xiong, Weijun Wang, Dong Hu, Shu Wang, Jingman Lu, Andrzej Katunin   +6 more
wiley   +1 more source

Vibration and Performance Analyses Using Individual Blade Pitch Controls for Lift‐Offset Rotors

International Journal of Aerospace Engineering, Volume 2019, Issue 1, 2019., 2019
This work attempts to reduce the hub vibratory loads of a lift‐offset rotor using IBC (individual blade pitch control) in high‐speed forward flight. As a lift‐offset rotor for the present study, the rigid coaxial rotor of a XH‐59A compound helicopter is considered and CAMRAD II is used to predict the hub vibration and rotor performance.
Jae-Sang Park, Do-Hyung Kim, Sanghyun Chae, Ye-Lin Lee, Jeong-In Go, Joseph Majdalani   +5 more
wiley   +1 more source

Active noise control by means of high frequency injection in electric motors

IET Electric Power Applications, Volume 18, Issue 8, Page 897-911, August 2024.
Aiming to improve the acoustics surrounding motor drives, this paper proposes the application of High Frequency Injection (HFI), with the aim of creating acoustic noise that is in anti‐phase relation to an unwanted noise. The injected High Frequency (HF) voltage produces torque pulsations and vibrations within the motor. This vibratory energy initiates
Stefanos Skoulaxinos, Pat Wheeler, Gaurang Vakil   +2 more
wiley   +1 more source

Measurement of Slipper Behavior in Swashplate-Type Axial Piston Pumps

Tribology Online
In swash plate type axial piston pumps, slipper/swash plate sliding surfaces is subject to high fluctuating load. Therefore, the slippers are required to provide stable operation and reduce losses due to sliding. The behavior of the slipper fluctuates in
Shigeyoshi Kawakita, Yuuichirou Tanikawa, Shinji Tanaka, Keiji Kyogoku, Masao Kikuchi, Hiroshi Yamamoto   +5 more
doaj   +1 more source

Maximizing wind farm power output with the helix approach: Experimental validation and wake analysis using tomographic particle image velocimetry

Wind Energy, Volume 27, Issue 5, Page 463-482, May 2024.
Abstract Wind farm control can play a key role in reducing the negative impact of wakes on wind turbine power production. The helix approach is a recent innovation in the field of wind farm control, which employs individual blade pitch control to induce a helical velocity profile in a wind turbine wake. This forced meandering of the wake has turned out
Daan van der Hoek, Bert Van den Abbeele, Carlos Simao Ferreira, Jan‐Willem van Wingerden   +3 more
wiley   +1 more source

Performance and Vibration Analyses of Lift‐Offset Helicopters

International Journal of Aerospace Engineering, Volume 2017, Issue 1, 2017., 2017
A validation study on the performance and vibration analyses of the XH‐59A compound helicopter is conducted to establish techniques for the comprehensive analysis of lift‐offset compound helicopters. This study considers the XH‐59A lift‐offset compound helicopter using a rigid coaxial rotor system as a verification model.
Jeong-In Go, Do-Hyung Kim, Jae-Sang Park, Davide Micheli   +3 more
wiley   +1 more source

Electric machine sizing consideration for ePumps in mobile hydraulics

Energy Science &Engineering, Volume 12, Issue 3, Page 793-809, March 2024.
This research examines the energy efficiency and design of various ePump architectures for off‐road vehicles, with a special focus on those integrating permanent magnet synchronous machines and axial piston machines. The study reveals that variable displacement ePumps can cut electrical machine size by up to 40% under certain conditions, while the ...
Hassan Assaf, Shanmukh Sarode, Andrea Vacca, Scott D. Sudhoff   +3 more
wiley   +1 more source

The proof of concept of uninterrupted push‐pull electromagnetic propulsion and energy conversion systems for drones and planet landers

Engineering Reports, Volume 6, Issue 1, January 2024.
We present a proof of concept to demonstrate the capability of a newly invented variable speed push‐pull electromagnetic propulsion system for uninterruptedly generating the reciprocating motion of a magnetic‐piston by a solar battery‐driven polarity changer timing circuit together with a laser‐based timing circuit for redundancy.
Sanal Kumar VR, Amrith Mariappan, U. K. Thianesh, Ajith Sukumaran, Ashish Kumar, V. K. Vijil Lal, Jerin John, Raunak Sharma, Sanjay Singh   +8 more
wiley   +1 more source

A Novel Heli-Twin-Rotor Unmanned Aerial Vehicle: Design, Realization and Flying

Guidance, Navigation and Control
This paper presents a novel twin-rotor Unmanned Aerial Vehicle (UAV). By replacing the conventional single swashplate with two independent tilting mechanisms, it simplifies the mechanical structure and achieves control decoupling, while also mitigating ...
Zhi Chen, Jiajun Fu, Jingqi Ma, Jing Sun, Siyuan Wu, Xindong Fu   +5 more
doaj   +1 more source

Scaling Criteria for Axial Piston Machines Based on Thermo-Elastohydrodynamic Effects in the Tribological Interfaces

Energies, 2018
In lieu of reliable scaling rules, hydraulic pump and motor manufacturers pay a high monetary and temporal price for attempting to expand their production lines by scaling their existing units to other sizes.
Lizhi Shang, Monika Ivantysynova
doaj   +1 more source