Results 21 to 30 of about 191,773 (209)
Combined Machining of Ti-6Al-4V Alloy Using Electrochemical Milling and Electrochemical Grinding
International Journal of Electrochemical Science, 2019 Ti-6Al-4V is a typical difficult-to-cut material with which it is difficult to achieve a high processing efficiency and good surface quality simultaneously using a single processing method.
Gangqiang Liu +4 more
doaj +1 more source
Manoeuvrability assessment of a hybrid compound helicopter configuration [PDF]
, 2014 The compound helicopter design could potentially satisfy the new emerging requirements placed on the next generation of rotorcraft. The main benefit of the compound helicopter is its ability to reach speeds that significantly surpass the conventional ...
Ferguson, Kevin, Thomson, Douglas
core
Installation Effect of the Rear-Mounted Tails of a Compound Helicopter on Its Propeller Noise
AerospaceFor high-speed compound helicopters, such as the S-97 Raider, the reflection and diffraction effects of vertical/horizontal tails on pusher propeller noise are inevitable.
Tao Yang +5 more
doaj +1 more source
Respiratory Research, 2022 Background During the COVID-19 pandemic in The Netherlands, critically ill ventilated COVID-19 patients were transferred not only between hospitals by ambulance but also by the Helicopter Emergency Medical Service (HEMS).
Cornelis Slagt +7 more
doaj +1 more source
Supervised Control of a Flying Performing Robot using its Intrinsic Sound [PDF]
, 2009 We present the current results of our ongoing research in achieving efficient control of a flying robot for a wide variety of possible applications. A lightweight small indoor helicopter has been equipped with an embedded system and relatively simple ...
Gongora, Mario A. +3 more
core +1 more source
Applied Sciences, 2023 The high level of noise in helicopter cabins considerably compromises the comfort and safety of the pilot and passengers. To verify the feasibility and effectiveness of microperforated panel composite sound absorption structures for noise suppression in ...
Chenglei Li +3 more
doaj +1 more source
An Efficient Method for Rotor Aeroacoustic Calculation Accounting for Rotor Downwash Influence
AerospaceBased on the Ffowcs Williams–Hawkings equations and the computational fluid dynamics method, the rotor’s aeroacoustic characteristics, considering the influence of the downwash flowfield on the sound propagation process, are calculated and analyzed ...
Bo Wang +4 more
doaj +1 more source
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
Characteristics of Shock Wave/Boundary Layer Interactions on Rotor Airfoils
Nanjing Hangkong Hangtian Daxue XuebaoUtilizing the Reynolds‑averaged Navier‑Stokes （RANS） method in conjunction with a locally variable γ‑Rẽθt transition model， an in‑depth investigation is conducted on the characteristics of shock wave/boundary layer interaction （SWBLI） for the rotor ...
YANG Liuqing +5 more
doaj +1 more source