Results 1 to 10 of about 69,343 (215)

Parameter Analysis of Active Flap Control for Rotor Aerodynamic Control and Design

International Journal of Aerospace Engineering, 2023
Active rotor control of helicopters is the future development direction, and active flap control (AFC) is one of the most promising technologies. However, the numerical simulation of an AFC rotor is challenging.
Runze Xia, Zhiyuan Hu, Yongjie Shi, Guohua Xu   +3 more
doaj   +1 more source

Research on Contact and Wear Characteristics of the Planetary Roller Screw Mechanism with Screw Misalignments

Lubricants, 2022
Misalignments are unavoidable in most applications of the planetary roller screw mechanism (PRSM) due to many potential causes. However, the effect of screw misalignments on the contact characteristics for the PRSM have not been thoroughly investigated ...
Junjie Meng, Xing Du, Xin Zhao, Junwei Zheng, Dingwei Wang, Long Wan   +5 more
doaj   +1 more source

A Multiscale Accuracy Degradation Prediction Method of Planetary Roller Screw Mechanism Based on Fractal Theory Considering Thread Surface Roughness

Fractal and Fractional, 2021
The wear problems are vital to the planetary roller screw mechanism (PRSM) as they have a great influence on transmission accuracy, working efficiency, and service life.
Junjie Meng, Xing Du, Yingming Li, Peng Chen, Fuchun Xia, Long Wan   +5 more
doaj   +1 more source

Research progress of helicopter noise suppression technology based on materials/structures

Journal of Aeronautical Materials, 2022
Helicopter has achieved rapid development and wide application in various fields, due to its unique flight mode. However, the noise is also a particular feature of the helicopter, which people cannot bear without protection.
LI Wenzhi, CAO Yaoqin, HE Zhiping
doaj   +1 more source

Research of effect of aerodynamic interference between rotors on vortex ring state of quadrotor aircraft

Xibei Gongye Daxue Xuebao
To investigate the impact of the aerodynamic interference among multirotors on the characteristics of vortex rings and their underlying mechanisms, a combination of detached eddy simulation (DES) and overset grid methods to simulate the unsteady ...
LI Yinhan, SU Dacheng, YANG Renguo, WU Linghua, HUANG Shuilin   +4 more
doaj   +1 more source

Numerical calculation and analysis of aero-acoustic characteristics of tilt rotor in different tilt angles

Xibei Gongye Daxue Xuebao
The numerical calculation model for the aero-acoustic analysis of a tilt rotor was established by combining the free wake method and the FW-H (Ffowcs Williams-Hawkings) equation.
YUAN Mingchuan, SUN Huixun, LI Zhibin, NIU Qingfeng, FAN Feng   +4 more
doaj   +1 more source

Analysis of aerodynamic characteristics of helicopter biplane tailplane

Xibei Gongye Daxue Xuebao
To analyze the aerodynamic characteristics of helicopter biplane tailplane, computational models for helicopter biplane tailplane and monoplane tailplane were established via CFD.
SUN Huixun, SUN Pengpeng, YANG Yongfei, YUAN Mingchuan, FAN Feng, LIN Yongfeng   +5 more
doaj   +1 more source

Trajectory Planning and Robustness Analysis for Mars Helicopters Under Uncertain Wind Fields

Machines
Wind disturbances in the thin Martian are highly stochastic and spatially correlated, posing significant challenges to rotorcraft flight safety. Meanwhile, limited onboard computational resources make real-time safe trajectory planning difficult.
Chaoqun Zhang, Yi Wei, Tianle Yu, Yi Luo, Jianbo Li   +4 more
doaj   +1 more source

Transient Vibration Loads Characteristics Analysis of Variable Speed Rotor

Applied Sciences
To investigate the rotor vibration loads during the variable speed transient process, a transient rotor aeroelastic method based on the medium beam deformation theory and Hamilton’s principle is developed to simulate the rotor transient dynamic loads in ...
Zhihao Yu, Chunhua Li, Jian Huang, Yi Cheng   +3 more
doaj   +1 more source

Fatigue Performance Improvement of Laminated Smart Structures by Different Material Conjunction Positions

Nanjing Hangkong Hangtian Daxue Xuebao
To investigate the effect of conjunction position on fatigue performance of laminated smart structures， a study of macro fiber composite（MFC） and glass fiber reinforced polymer （GFRP） laminated smart structure is presented.
LIU Runfu, HAN Dong, WANG Tianjian, ZHU Yin   +3 more
doaj   +1 more source