Results 151 to 160 of about 2,332 (184)

Civil Tiltrotor Aircraft Operations

11th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference, 2011
The goal of the current study is to investigate the benefits and challenges of operating a notional fleet of civil tiltrotor aircraft (10-, 30-, 90-, and 120-passenger vehicles), in the commercial transport role, in the projected Next Generation airspace system.
Larry Young, William Chung, Alfonso Paris, Daniel Salvano, Ray Young, Huina Gao, Victor Cheng, Ken Wright   +7 more
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Aeroelastic analysis of advanced geometry tiltrotor aircraft

36th Structures, Structural Dynamics and Materials Conference, 1995
A tiltrotor model is formulated to predict the dynamics and aeroelastic stability of composite-coupled advanced geometry rotors. Advanced geometry rotor blades are modeled with arbitrary sweep, anhedral, pretwist and planform taper variation with span.
Venkataraman Srinivas, Inderjit Chopra, Mark W. Nixon   +2 more
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Adaptive nonlinear control for tiltrotor aircraft

Proceedings of the 1998 IEEE International Conference on Control Applications (Cat. No.98CH36104), 2002
The combination of feedback linearization and adaptive 'neural' networks provides a powerful controller architecture. This paper presents some of the nonlinear, and adaptive flight control research being conducted in this area in the School of Aerospace Engineering at the Georgia Tech.
R.T. Rysdyk, A.J. Calise
openaire   +1 more source

Comparison of Linear Flexible Aircraft Model Structures on Large Flexible Tiltrotor Aircraft

Journal of Aircraft, 2023
Structural modes for large aircraft occur at low frequencies and must be accounted for in the flight dynamics modeling and control system design process. An analysis is performed on various linear representations of flexible aircraft with an application to the lateral/directional flexible dynamic response of the notional Large Civil Tiltrotor (LCTR2 ...
Ondrej Juhasz, Mark B. Tischler, Roberto Celi   +2 more
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Empirical Wake Turbulence Model of Tiltrotor Aircraft

SAE Technical Paper Series, 2005
<div class="htmlview paragraph">This paper describes the methods used to collect and reduce wake turbulence data behind two distinct types of tiltrotor aircraft using a Light Detection and Ranging (LIDAR) measurement system, which uses laser velocimetry to measure the velocity of dust particles in air that has been disturbed by the passage of an ...
Sam Ferguson, Mark E. Dreier
openaire   +1 more source

An improved online system identification method for tiltrotor aircraft

Aerospace Science and Technology, 2021
Abstract An online system identification method for tiltrotor aircraft flight dynamics modeling is developed in this paper. A general parametric flight dynamics model which can be used for online identification purpose in the three flight modes of tiltrotor aircraft (i.e., helicopter mode, conversion mode, and fixed-wing mode) is developed, and an ...
Wei Wu, Renliang Chen
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Military potential of TiltRotor aircraft

The Aeronautical Journal, 1983
The TiltRotor concept combines the wing of an aircraft with the rotors of a helicopter. The result is a VTOL aircraft which is fuel-efficient in both cruise and hover. It can be thought of as a turboprop aircraft which can take off and land vertically, but it is also an advanced rotorcraft which has twice the speed and range of present-day helicopters ...
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A wake bending unsteady dynamic inflow model of tiltrotor in conversion flight of tiltrotor aircraft

Science in China Series E: Technological Sciences, 2009
The aerodynamics, dynamic responses and aeroelasticity of tiltrotor aircraft in the tilting of rotor i.e. in conversion flight are extraordinarily complicated. The traditional quasi-steady assumption model can not reflect the unsteady aerodynamic problems in the tilting of rotor.
HaiLong Yue, PinQi Xia
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Adaptive Model-Informed Controller for Tiltrotor Aircraft

Journal of Aircraft
An adaptive, model-informed controller based on active disturbance rejection control (ADRC) is developed for tiltrotor aircraft to provide precise and robust control across helicopter, conversion, and fixed-wing modes. The inner loop controls pitch attitude and applies a thrust-augmented state to achieve closed-loop thrust control and real-time ...
Yanqin Zhao, Peilin Liu, Xufei Yan
openaire   +1 more source

Turboshaft Engine Development for Commercial Tiltrotor Aircraft

SAE Technical Paper Series, 1991
<div class="htmlview paragraph">The civil aircraft market frequently employs propulsion systems originally developed and qualified for military aircraft applications. When this occurs, the civil sector benefits greatly from the lessons learned during the military engine development and qualification process.
openaire   +1 more source