Results 41 to 50 of about 4,258 (219)

An rVPM-Based Aerodynamic Hybrid Optimization Method for Coaxial Rotor with Differentiated Upper and Lower Blades in Both Hover and High-Speed Cruising States

Aerospace
To enhance the performance of rigid coaxial rotors across both hovering and high-speed cruising conditions, this study develops a novel aerodynamic optimization method that differentiates between the upper and lower rotors. Utilizing the lifting line and
Zhiwei Ding, Dengyan Duan, Chaoqun Zhang, Jianbo Li   +3 more
doaj   +1 more source

Wind Tunnel Studies on Hover and Forward Flight Performances of a Coaxial Rigid Rotor

Aerospace, 2021
The aerodynamic performance of a reduced-scale coaxial rigid rotor system in hover and steady forward flights was experimentally investigated to gain insights into the effect of interference between upper and lower rotors and the influences of the ...
Chang Wang, Minqi Huang, Xianmin Peng, Guichuan Zhang, Min Tang, Haowen Wang   +5 more
doaj   +1 more source

Dispensing Volumetric Additive Manufacturing

Advanced Functional Materials, EarlyView.
Dispensing volumetric additive manufacturing (DVAM) prints 3D structures inside a photocurable resin droplet suspended from the tip of a glass pipette, enabling sequential printing without resin vats or manual part removal. Real‐time droplet profiling and ray‐tracing‐based correction compensate for optical distortion at the curved resin‐air interface ...
Hongryung Jeon, Yunsoo Lee, Seobin Park, Kyung‐Hwan Kim, Junyoung Seo, Im Doo Jung   +5 more
wiley   +1 more source

Simulation of Unsteady Aerdynamic Load for Rigid Coaxial Rotor in Forward Flight with Vortex Particle Method [PDF]

, 2017
Co-axial rotor systems are frequently used for high-speed helicopters. Nevertheless, issues related to rotor-head drag, aerodynamic performance and vibration should also be considered. Simulating the unsteady aerodynamic loads for a rigid coaxial rotor,
Barakos, George N., Sun, Yiming, Tan, Jianfeng   +2 more
core  

Magnetic Textiles: A Review of Materials, Fabrication, Properties, and Applications

Advanced Materials Technologies, EarlyView.
Magnetic textiles (M‐textiles) are emerging as a programmable materials platform that merges magnetic matter with hierarchical textile structures. This article consolidates magnetic material classes, textile architectures, and fabrication and magnetization strategies, revealing structure–property–function relationships that govern magneto‐mechanical ...
Li Ke, Moses Kumi, Xiaoming Tao, Junhong Pu   +3 more
wiley   +1 more source

Horizontal Wind Effect on the Aerodynamic Performance of Coaxial Tri-Rotor MAV

Applied Sciences, 2020
The coaxial Tri-rotor micro air vehicle (MAV) is composed of three coaxial rotors where the aerodynamic characteristics of is complicated in flight especially when the wind effect is introduced.
Yao Lei, Yiqiang Ye, Zhiyong Chen
doaj   +1 more source

Experimental Investigations of Acoustic Characteristics of Two Counter-Rotating Rotors. [PDF]

, 2016
The presented investigations are continuation of earlier researches performed in the Institute of Turbomachinery (Lodz University of Technology, Poland). The main aim of this paper is to investigate the acoustics properties of the chosen configuration of
Błaszczak, Jarosław R., Rydlewicz, Wojciech   +1 more
core  

Waveguide Photoactuators: Materials, Fabrication, and Applications

Advanced Robotics Research, EarlyView.
Waveguide photoactuators convert guided light into mechanical motion. Their tethered‐flexible design enables minimally invasive surgery and confined‐space robotics. This review aims to guide materials selection, device design, and system integration, accelerating the transition of waveguide photoactuators from laboratory prototypes to versatile ...
Minjie Xi, Hemin Pan, Yang Zong, Yongfeng Mei, Jizhai Cui   +4 more
wiley   +1 more source

Dynamics of synchronization for four hydraulic motors in a vibrating pile driver system

Advances in Mechanical Engineering, 2016
This article proposes a self-synchronous vibrating mechanism with four unbalanced rotors driven by four hydraulic motors mounted symmetrically on two coaxial rotating beams. Analytical expressions of the steady-state response for the multi-body vibrating
Bin He, Chunyu Zhao, Haiyang Wang, Xuede Chang, Bangchun Wen   +4 more
doaj   +1 more source

Coaxial Rotor Flow Phenomena in Forward Flight [PDF]

SAE Technical Paper Series, 2016
<div class="section abstract"><div class="htmlview paragraph">Coaxial rotors are finding use in advanced rotorcraft concepts. Combined with lift offset rotor technology, they offer a solution to the problems of dynamic stall and reverse flow that often limit single rotor forward flight speeds.
Natasha Barbely, Narayanan Komerath
openaire   +1 more source