Results 81 to 90 of about 63,330 (315)
Modeling and simulation of one- and two-row six-bladed ducted fans
Научно-технический вестник информационных технологий, механики и оптикиThe problem of simulation of efficient ducted fan type propulsors is considered. From experience of operation of twin blades in fantails of helicopters, it is known that this configuration creates less noise compared to a uniform arrangement of the ...
S. Yu. Dudnikov +4 more
doaj +1 more source
Rethinking brachycephaly: Anatomical implications and health considerations in lagomorphs
The Anatomical Record, EarlyView.Abstract Brachycephaly in domestic rabbits is increasingly perceived by welfare organizations as associated with significant health complications, particularly oral pathologies. Despite this perception, comparative anatomical research into rabbit brachycephaly is limited compared to that of dogs and cats, compelling an in‐depth examination of its ...
Helaina Cressy +3 more
wiley +1 more source
Lift–Thrust Integrated Ducted-Grid Fusion Configuration Design for a Ducted Fan Tail-Sitter UAV
Applied SciencesA new lift enhancement scheme is designed for the cruise flight process of a tail-sitter UAV (Unmanned Aerial Vehicle), proposing a fusion configuration with embedded grid channels on the duct wall. The low pressure zone at the lip of the duct is induced
Lei Liu, Baigang Mi
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Anatomical Sciences Education, Volume 18, Issue 3, Page 241-253, March 2025.Abstract This study describes the process of developing a high‐impact, low‐cost, and low‐maintenance air ventilation system for anatomy facilities. It employed the strategic application of Value Engineering (VE), assuring that the air ventilation system meets contemporary threshold limit values (TLVs) for formaldehyde in the working zone of dissection ...
Jürgen Russ, Niels Hammer
wiley +1 more source
Preliminary design and evaluation of a ducted-fan type pipeline robot
ROBOMECH JournalPipelines are crucial infrastructure supporting human life, yet their maintenance costs are substantial, necessitating the development of time-efficient robotic systems.
Shota Miyake +3 more
doaj +1 more source
Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2018 When developing counter-rotating fans for advanced aircraft engines with ducted blades (CRTF), it is very important to ensure high acoustic and aerodynamic characteristics. To provide investigations of aerodynamic and acoustic performance of the original
V. I. Mileshin +3 more
doaj +1 more source
Variable geometry aft-fan for takeoff quieting or thrust augmentation of a turbojet engine [PDF]
A concept is presented that combines the low-noise and high-thrust characteristics of a turbofan at takeoff, together with its high efficiency at subsonic flight speeds, with the high efficiency of a turbojet at supersonic cruise.
Evans, D. G., Weber, R. J.
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Experimental study of the instationary flow between two ducted Counter-rotating rotors [PDF]
, 2013 The purpose of this work is to study experimentally the aerodynamic characteristics of a subsonic counter-rotating axial-flow fans system operating in a ducted configuration.
BAKIR, Farid +4 more
core +6 more sources
Design of discrete PI‐PR2 controllers for time‐delayed systems using dominant pole placement method
Asian Journal of Control, EarlyView.Abstract This paper presents a new controller structure known as the proportional‐integral proportional‐double‐retarded (PI‐PR2) designed for discrete‐time systems with time delay. The dominant pole placement technique, which is frequently encountered in control systems, is used as the primary design method. The design method starts that dominant poles
Ayşe Duman Mammadov +2 more
wiley +1 more source
Acoustic Power Transmission Through a Ducted Fan [PDF]
For high-speed ducted fans, when the rotor flowfield is shock-free, the main contribution to the inlet radiated acoustic power comes from the portion of the rotor stator interaction sound field that is transmitted upstream through the rotor.
Envia, Ed
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