FINITE ELEMENT ANALYSIS ON THE INFLUENCE OF PITTING DEFECT ON THE CONTACT STRESS OF FACE GEAR (MT) by HUANG ZhenRong, ZHANG Juan

“…In order to study the influence of pitting defect on the contact stress of face gear, a face gear of helicopter transmission system was taken as the research object, the defect shape was assumed to be spherical and the solid model was built by UG and Catia software. …”
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Contact Analysis of Sprag-type Overrunning Clutches by Yang Hongtu, Gao Peng, Yan Weiping, Wang Yonghui, Yang Min

“…Sprag-type overrunning clutches are widely used in aeroengines and the helicopter transmission system. The research on the contact properties of sprag-type overrunning clutches has important significance to the design of high reliability clutch. …”
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Temperature Field Analysis and Experimental Test of Spur Gears with High Contact Degree by Pan Yu, Yang Man, Bao Heyun, Li Fajia

“…The spur gear with high contact degree used in the helicopter transmission system is lubricated and cooled by oil injection, and its temperature characteristics are related to the service life of the gear. …”
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Emergency Flight Control Based on the Fan Wing by Lin Meng, Shuo Wang, Ye Chen, Yang Gao

“…FanWing has been taken to the visual field because of its performance combination of fixed-wing aircraft and helicopter. Its flight mode is currently limited mainly by a remote control, while the research of automated flight control is on the rise. …”
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Bending Vibration Suppression of a Flexible Multispan Shaft Using Smart Spring Support by Bo Peng, Rupeng Zhu, Miaomiao Li, Ziyang Tang

“…The relationship between the vibration suppression effect and the control parameters of the SMSS is obtained through a numerical example involving a helicopter tail drive shaft. A structure of the SMSS is designed and examined with a rotor test. …”
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Optimal Design and Acoustic Assessment of Low-Vibration Rotor Blades by G. Bernardini, E. Piccione, A. Anobile, J. Serafini, M. Gennaretti

“…An optimal procedure for the design of rotor blade that generates low vibratory hub loads in nonaxial flow conditions is presented and applied to a helicopter rotor in forward flight, a condition where vibrations and noise become severe. …”
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Control Law Design for Twin Rotor MIMO System with Nonlinear Control Strategy by M. Ilyas, N. Abbas, M. UbaidUllah, Waqas A. Imtiaz, M. A. Q. Shah, K. Mahmood

“…Twin rotor multi-input multioutput system (TRMS) is a laboratory setup designed for control experiments, which resembles a helicopter with unstable, nonlinear, and coupled dynamics. …”
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Expressions of a backlash: Challenging the story of success in Norwegian cinema of the 1980s and 1990s by Fosheim Lund Maria, Kielland Servoll Johanne, Holtar Ingrid Synneva

“…In Norwegian film history, this decade is known as “the helicopter period” and is associated with a turn towards commercial genre film and classical dramaturgy. …”
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ASSOCIATION BETWEEN SITTING AND OCCUPATIONAL LOW BACK PAIN (LBP) by \

“…Results: The occupational group that showed the strongest association with LBP was Helicopter Pilots (OR = 9.0, 90% C.I = 4.9 -16.4). For all occupations, the odds ratio (OR) increased when WBV and/or awkward postures were analyzed as co-exposure factors. …”
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Stall Flutter Control of a Smart Blade Section Undergoing Asymmetric Limit Oscillations by Nailu Li, Mark J. Balas, Pourya Nikoueeyan, Hua Yang, Jonathan W. Naughton

“…Stall flutter is an aeroelastic phenomenon resulting in unwanted oscillatory loads on the blade, such as wind turbine blade, helicopter rotor blade, and other flexible wing blades. …”
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Damage and Failure of Aeroengine Blades Under Small UAV Impacts by Zhibin Wu, Chi Chen, Feiying Chen, Jun Liu

“…In this paper, a finite element (FE) model of a UAV with a weight of 4.78 kg, turbofan blades, propeller blades, and helicopter tail rotor blades was developed. The FE modelling was carried out by commercial software named LS-DYNA R13.1.0, which is one of the most advanced simulation tools for nonlinear dynamic structural analysis, mainly solving numerical simulations of collision and penetration problems. …”
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Optimization Design of Diaphragm Profile based on Kriging Model by Geng Hu, Zhigang Chen, Ding Zhang

“…The proposed method is then utilized to optimize the profile design of a diaphragm in a helicopter transmission system，and the results show that the static stress and dynamic stress of the critical point for the optimized diaphragm are decreased by 18.7% and 40.7% respectively compared with the original diaphragm design，and thus the high-cycle fatigue safety factor of the optimized diaphragm is increased by 52.8%. …”
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Mechanical Behaviour of Inconel 718 Thin-Walled Laser Welded Components for Aircraft Engines by Enrico Lertora, Chiara Mandolfino, Carla Gambaro

“…The main application of this kind of joint is the manufacturing of a helicopter engine component. In particular the aim was to obtain a specific cross section geometry, necessary to overcome the mechanical stresses found in these working conditions without failure. …”
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On the Vibration Analysis of Rotating Piezoelectric Functionally Graded Beams Resting on Elastic Foundation with a Higher-Order Theory by Pham Minh Phuc, Vu Nguyen Thanh

“…This is a common kind of design seen in reality, such as marine engine gas turbine blades, rotating railway bridges, and helicopter rotors, where these components may be thought of as beam models rotating around a fixed axis. …”
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Multiobjective Multistate System Preventive Maintenance Model with Human Reliability by Chao-Hui Huang, Chun-Ho Wang, Guan-Liang Chen

“…The optimised solutions are determined from the nondominated Pareto frontier comprising the diversified PM alternatives. A helicopter power transmission system is used as an example to illustrate the efficacy and applicability of the proposed approach through sensitivity analyses with relevant parameters.…”
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Sliding Mode Disturbance Observer-Based Control of a Laboratory Twin Rotor Multi Input-Multi Output System by Seyyed Sajjad Moosapour, Habib Mehdipour, Mehrdad Keramatzadeh

“…The TRMS is a two rotational degree-of-freedom unstable structure with significant channel-coupling, nonlinear characteristics, and external disturbances, which resembles a real helicopter’s characteristics and can be used as an aerodynamic testing setup. …”
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H∞ Loop Shaping Control of Input Saturated Systems with Norm-Bounded Parametric Uncertainty by Renan Lima Pereira, Karl Heinz Kienitz

“…Finally, the effectiveness of the method is illustrated through application to a physical system: a VTOL “vertical taking-off landing” helicopter.…”
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Case Series: Successful Resuscitation of Severe Facial Injuries Caused by a Chainsaw by Han Joo Choi

“…He was transferred to the Level I trauma center using the Doctor-Helicopter. During his flight, bleeding control was tried and the information was given to the trauma surgeons before his arrival. …”
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Low-Cost Solution for Assessment of Urban Flash Flood Impacts Using Sentinel-2 Satellite Images and Fuzzy Analytic Hierarchy Process: A Case Study of Ras Ghareb City, Egypt by Mohammed Sadek, Xuxiang Li

“…In this work, we utilized two Sentinel-2 satellite images, before and after the flash flood, SRTM and photos captured by using a helicopter. This paper aims at three prime objectives. …”
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USING UNMANNED AERIAL VEHICLES IN RECOGNIZING TERRAIN ANOMALIES ENCOUNTERED IN THE GAS PIPELINE RIGHT-OF-WAY (ROW) by Jarosław KOZUBA, Marek MARCISZ, Sebastian RZYDZIK, Marcin PASZKUTA

“…The present work describes the use and capabilities of the UAV in the mapping of photo acquisition conditions similar to those performed during inspection flights with the use of a manned helicopter equipped with a hyperspectral camera, in the target range of visible light. …”
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