Results 1 to 10 of about 1,251 (136)
Transcranial Ultrasound in the Helicopter Emergency Medical Services-A Feasibility Study. [PDF]
J NeuroimagingABSTRACT Background and Purpose Transcranial color‐coded Doppler (TCCD) is a noninvasive, widely available diagnostic method that may identify large vessel occlusion (LVO) in acute stroke patients. This study aimed to explore whether helicopter emergency medical services (HEMS) physicians could use TCCD in a prehospital setting to identify the proximal
Rognes IN +8 more
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Aerodynamics Analysis of Helicopter Rotor in Flight Test Using Strain Gauge Sensors [PDF]
SensorsThe acquisition of aerodynamic loads on helicopter rotors is fundamental to the study of helicopter performance optimization, structural design, flight control, and other aspects.
Shuaike Jiao, Jiahong Zheng
doaj +2 more sources
Engineering Applications of Computational Fluid Mechanics, 2019 Coupled ship/coaxial-rotor simulations have been conducted to investigate the rotor loads of a shipborne coaxial-rotor helicopter during a vertical landing based on Reynolds-averaged Navier-Stokes (RANS) solver.
Yongjie Shi
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Effect of low temperature on fatigue and crack propagation behavior of aeronautic aluminium alloy
Journal of Aeronautical Materials, 2021 Fatigue and crack growth tests were performed on two categories of the common aeronautic aluminum- alloys 2524-T3 and 7050-T7451 at ambient temperature of 25 ℃ and cryogenic temperature of –70 ℃, in order to investigate the fatigue and crack propagation ...
LIU Mudong
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Research Status and Advances in Cryogenic Crack Propagation of Aeronautic Aluminium-alloys
Hangkong gongcheng jinzhan, 2020 Aluminium-alloys are widely used in aeronautical engineering due to the advantages of high strength and easy processing. Low temperature inevitably occurs in aero-structures of aluminium-alloys, and cryogenic crack propagation of aeronautic aluminium ...
LIU Mudong
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Aerodynamic Modeling and Performance Analysis of Variable-Speed Coaxial Helicopter
Applied Sciences, 2022 In this paper, the variable-speed coaxial helicopter is modelled by the blade element method, non-uniform inflow method and empirical function method, and the aerodynamic performance analysis method is proposed.
Anan Xu, Fang Wang, Ming Chen, Liang Li
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Numerical Calculation Of Aerodynamic Loads Of Helicopter Rotor Using CFD / BET Method [PDF]
فناوری در مهندسی هوافضا, 2023 Considering the complexity of analyzing the phenomena affecting the aerodynamic performance of the main rotor helicopter and how to simulate the dynamic movements of the blade relative to the center of rotation, Using methods such as blade element theory
Mehdi Naderi Nezhad +2 more
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Jurnal Eltek, 2023 Vibrasi pada helikopter menjadi konsentrasi tersendiri untuk terus ditingkatkan penanganannya. Hal ini dikarenakan selain dapat menyebabkan kerusakan struktur badan helikopter jika vibrasi yang dihasilkan terlalu besar juga berpengaruh pada kenyamanan ...
Farida Gamar +2 more
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International Journal of Aerospace Engineering, 2020 The tail rotor of a helicopter operating under low-speed crosswind undergoes highly complex flow due to the interaction between the main rotor, fuselage, and tail rotor system.
Nahyeon Roh, Sejong Oh, Donghun Park
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Application of pressure head theory to determine the aerodynamic characteristics of the helicopter main rotor [PDF]
E3S Web of Conferences, 2021 A method is proposed for calculating main aerodynamic characteristics of the main rotor of the Mi-26 helicopter: a lift, a reactive moment, a required power of the propulsion system, a speed of the inductive air flow, a throttle response coefficient, a ...
Reshenkin Andrey +3 more
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