Results 31 to 40 of about 15,230 (231)
Aerospace, 2023 An active rotor with trailing-edge flaps (TEFs) is an effective active vibration control method for helicopters. Blade flapping dynamic characteristics have a significant effect on the active vibration control performance of an active rotor.
Xiancheng Gu +3 more
doaj +1 more source
Dynamic modeling of helicopter rotor blades
Tsinghua Science and Technology, 2009 Abstract This paper is concerned with the dynamic analysis of a pre-twisted rotating composite rotor blade. General kinematical relations for a beam theory that treated finite rotation were established. Two sets of analyses were extracted from the 3-D nonlinear blade analysis: one is the 2-D linear cross section analysis, and the other is the 1-D ...
Yifeng Wang, Haowen Wang, Zheng Gao
openaire +1 more source
Helicopter main rotor blade injury to the head with survival [PDF]
Journal of the Royal Army Medical Corps, 1997 A case of soldier surviving a major helicopter rotor blade injury occurring in daylight is described and the limited literature on the subject is discussed.
J R, Gibbons +3 more
openaire +2 more sources
Some Peculiarities of Helicopter Main Rotor Aeroacoustic for Far-Field Observer [PDF]
EPJ Web of Conferences, 2019 Mathematical models for helicopter rotor acoustics are usually based on the Ffowcs Williams–Hawkings (FW–H) equation. The level of rotor noise is determined by geometry (thickness noise) of a flying vehicle and distributed blade loading (loading noise ...
Kusyumov Alexander +4 more
doaj +1 more source
Strategic Management Journal, EarlyView.Abstract Research Summary Despite the importance of resource reallocation in shaping a variety of strategic outcomes, strategy scholars have paid only limited attention to the processes by which firms reallocate their resources across successive systemic innovations.
Gino Cattani +2 more
wiley +1 more source
The influence of helicopter tail rotor parameters on RCS
Hangkong gongcheng jinzhanHigh requirements have been placed on the stealth performance of armed helicopters during wartime missions，in order to reduce the probability of the helicopter being found during the task，based on geometric optics method and consistent diffraction theory，
ZHAO Qijun
doaj +1 more source
Wind Energy, Volume 29, Issue 5, May 2026.ABSTRACT Yaw engineering models are commonly used as add‐ons to the industrial blade element momentum (BEM) framework to improve load and power predictions by accounting for the skewed wake effect. However, existing yaw engineering models show noticeable limitations in accurately predicting the induced velocity distribution across the blade span.
Haoyuan Sun, Andrea Sciacchitano, Wei Yu
wiley +1 more source
Numerical simulation for three-dimensional rotor icing in forward flight
Advances in Mechanical Engineering, 2018 Icing will occur when helicopters pass through clouds containing supercooled droplets. The ice accreted on rotor blade affects the safety of helicopter. A numerical simulation method of helicopter rotor icing in forward flight is presented, and the icing
Zhengzhi Wang, Ning Zhao, Chunling Zhu
doaj +1 more source
The Trajectory and Structural Integrity of Aerially Deployed Manufactured Baits for Canid Control
Ecological Management &Restoration, Volume 27, Issue 2, May 2026.ABSTRACT In Australia, poison baits are aerially deployed in remote and inaccessible areas to mitigate invasive animal impacts. Program efficacy and compliance with mandated distance restrictions require accurate bait distribution but deployment accuracy and precision have not been evaluated for Doggone manufactured baits.
Elly Gooch +6 more
wiley +1 more source
Study on the Mechanism of the Variable-Speed Rotor Affecting Rotor Aerodynamic Performance
Applied Sciences, 2018 The variable-speed rotor has proven to be a promising means to improve helicopter performance. Previous investigations on the aeromechanics of the variable-speed rotor are scarce.
Jiayi Xie +3 more
doaj +1 more source