Results 21 to 30 of about 1,125 (144)

Vibration and Performance Analyses Using Individual Blade Pitch Controls for Lift‐Offset Rotors

International Journal of Aerospace Engineering, Volume 2019, Issue 1, 2019., 2019
This work attempts to reduce the hub vibratory loads of a lift‐offset rotor using IBC (individual blade pitch control) in high‐speed forward flight. As a lift‐offset rotor for the present study, the rigid coaxial rotor of a XH‐59A compound helicopter is considered and CAMRAD II is used to predict the hub vibration and rotor performance.
Jae-Sang Park, Do-Hyung Kim, Sanghyun Chae, Ye-Lin Lee, Jeong-In Go, Joseph Majdalani   +5 more
wiley   +1 more source

Intelligent Situational Control of Small Turbojet Engines

International Journal of Aerospace Engineering, Volume 2018, Issue 1, 2018., 2018
Improvements in reliability, safety, and operational efficiency of aeroengines can be brought in a cost‐effective way using advanced control concepts, thus requiring only software updates of their digital control systems. The article presents a comprehensive approach in modular control system design suitable for small gas turbine engines.
Rudolf Andoga, Ladislav Főző, Jozef Judičák, Róbert Bréda, Stanislav Szabo, Róbert Rozenberg, Milan Džunda, Konstantinos Kyprianidis   +7 more
wiley   +1 more source

Performance and Vibration Analyses of Lift‐Offset Helicopters

International Journal of Aerospace Engineering, Volume 2017, Issue 1, 2017., 2017
A validation study on the performance and vibration analyses of the XH‐59A compound helicopter is conducted to establish techniques for the comprehensive analysis of lift‐offset compound helicopters. This study considers the XH‐59A lift‐offset compound helicopter using a rigid coaxial rotor system as a verification model.
Jeong-In Go, Do-Hyung Kim, Jae-Sang Park, Davide Micheli   +3 more
wiley   +1 more source

Active Flow Control in a Radial Vaned Diffuser for Surge Margin Improvement: A Multislot Suction Strategy

International Journal of Rotating Machinery, Volume 2017, Issue 1, 2017., 2017
This work is the final step of a research project that aims at evaluating the possibility of delaying the surge of a centrifugal compressor stage using a boundary‐layer suction technique. It is based on Reynolds‐Averaged Navier‐Stokes numerical simulations. Boundary‐layer suction is applied within the radial vaned diffuser.
Aurélien Marsan, Isabelle Trébinjac, Stéphane Moreau, Sylvain Coste, Yutaka Ohta   +4 more
wiley   +1 more source

Coordinating a Service Supply Chain under Arms Offset Program’s Intervention by Performance‐Based Contracting

Mathematical Problems in Engineering, Volume 2016, Issue 1, 2016., 2016
This paper investigates a support service supply chain for coordinating with a local third‐party logistics provider by arms offset program’s intervention and develops a performance‐based contracting framework for the coordinating problem, which remains scarce in the literatures. The performance‐based contracting framework evaluates payments and profits
Yi-Kuei Lin, Jong-Jang Lin, Ruey-Huei Yeh, Young Hae Lee   +3 more
wiley   +1 more source

DESIGN-TECHNOLOGICAL PREPARATION OF PRODUCTION DEFLECTORS USING PULSE TECHNOLOGIES

Авіаційно-космічна техніка та технологія, 2019
The development of explosion punching processes is a rather complicated task for preparing the production of aircraft engines. The relatively large complexity and duration of production preparation, as well as the relatively high cost of the dies ...
Антон Виталиевич Онопченко
doaj   +1 more source

Fuel Cells: A Real Option for Unmanned Aerial Vehicles Propulsion

The Scientific World Journal, Volume 2014, Issue 1, 2014., 2014
The possibility of implementing fuel cell technology in Unmanned Aerial Vehicle (UAV) propulsion systems is considered. Potential advantages of the Proton Exchange Membrane or Polymer Electrolyte Membrane (PEMFC) and Direct Methanol Fuel Cells (DMFC), their fuels (hydrogen and methanol), and their storage systems are revised from technical and ...
Óscar González-Espasandín, Teresa J. Leo, Emilio Navarro-Arévalo, K.-M. Chung, M. Yamamoto   +4 more
wiley   +1 more source

Evaluation of the Potential of Recuperator on a 300-kW Turboshaft Helicopter Engine [PDF]

, 2020
In this thesis, an integrated rotorcraft multidisciplinary simulation framework has been developed to comprehensively evaluate the potential of the rotorcraft adopting a recuperator under various flight conditions as well as at mission levels. Through the execution of multi-objective genetic algorithm (GA) optimization, the Pareto front model is ...
openaire   +1 more source

The market and the future of gas turbine engines for super heavy transport helicopters

Авіаційно-космічна техніка та технологія
The introductory part of the article provides brief information about the main activity of Element JSC – the development and production of electronic control systems for aircraft engines, in particular, the RDC-450M ECU family for turboshaft gas turbine ...
Vadym Nerubaskyi
doaj   +1 more source

Fuel Weight Fraction Estimation for a Disk–Rotor Hybrid Aircraft Along an Optimal Flight Trajectory During Concept Design

International Journal of Aerospace Engineering, Volume 2025, Issue 1, 2025.
Owing to the transition flight of rotor/wing hybrid vertical take‐off and landing (VTOL) aircraft, the fuel weight cannot be estimated from empirical data during the conceptual design phase. This paper proposes a method for estimating the minimal fuel weight fraction (FWF) through a strategy of trajectory optimization under a given flight profile.
Menglin Yang, Zhiqiang Wan, De Yan, Jingwei Chen, Jinchao Chen   +4 more
wiley   +1 more source