Reduction of Blade-Vortex Interaction (Bvi) Noise Through X-Force Control
Title | Reduction of Blade-Vortex Interaction (Bvi) Noise Through X-Force Control PDF eBook |
Author | National Aeronautics and Space Adm Nasa |
Publisher | Independently Published |
Pages | 34 |
Release | 2018-10-17 |
Genre | Science |
ISBN | 9781728896175 |
Momentum theory and the longitudinal force balance equations of a single rotor helicopter are used to develop simple expressions to describe tip-path-plane tilt and uniform inflow to the rotor. The uniform inflow is adjusted to represent the inflow at certain azimuthal locations where strong Blade-Vortex Interaction (BVI) is likely to occur. This theoretical model is then used to describe the flight conditions where BVI is likely to occur and to explore those flight variables that can be used to minimize BVI noise radiation. A new X-force control is introduced to help minimize BVI noise. Several methods of generating the X-force are presented that can be used to alter the inflow to the rotor and thus increasing the likelihood of avoiding BVI during approaches to a landing. Schmitz, Fredric H. Ames Research Center RTOP 505-59-36
Reduction of Blade-Vortex Interaction (BVI) Noise Through X-force Control
Title | Reduction of Blade-Vortex Interaction (BVI) Noise Through X-force Control PDF eBook |
Author | Fredric H. Schmitz |
Publisher | |
Pages | 36 |
Release | 1995 |
Genre | |
ISBN |
Rotorcraft Blade-vortex Interaction Noise Reduction Through Attitude and Flight Parameter Variations
Title | Rotorcraft Blade-vortex Interaction Noise Reduction Through Attitude and Flight Parameter Variations PDF eBook |
Author | Juan Abelló |
Publisher | |
Pages | 466 |
Release | 2004 |
Genre | |
ISBN |
Blade-vortex Interaction Noise Generation and Directionality
Title | Blade-vortex Interaction Noise Generation and Directionality PDF eBook |
Author | Wel-Chong Sim |
Publisher | |
Pages | 360 |
Release | 1996 |
Genre | |
ISBN |
Machines, Mechanism and Robotics
Title | Machines, Mechanism and Robotics PDF eBook |
Author | Rajeev Kumar |
Publisher | Springer Nature |
Pages | 1830 |
Release | 2021-07-21 |
Genre | Technology & Engineering |
ISBN | 9811605505 |
This volume includes select papers presented during the 4th International and 19th National Conference on Machines and Mechanism (iNaCoMM 2019), held in Indian Institute of Technology, Mandi. It presents research on various aspects of design and analysis of machines and mechanisms by academic and industry researchers.
Aerodynamic Aspects of Blade-vortex Interaction (BVI)
Title | Aerodynamic Aspects of Blade-vortex Interaction (BVI) PDF eBook |
Author | Chee Tung |
Publisher | |
Pages | |
Release | 1996 |
Genre | |
ISBN |
Principles of Helicopter Aerodynamics with CD Extra
Title | Principles of Helicopter Aerodynamics with CD Extra PDF eBook |
Author | Gordon J. Leishman |
Publisher | Cambridge University Press |
Pages | 860 |
Release | 2006-04-24 |
Genre | Science |
ISBN | 9780521858601 |
Written by an internationally recognized teacher and researcher, this book provides a thorough, modern treatment of the aerodynamic principles of helicopters and other rotating-wing vertical lift aircraft such as tilt rotors and autogiros. The text begins with a unique technical history of helicopter flight, and then covers basic methods of rotor aerodynamic analysis, and related issues associated with the performance of the helicopter and its aerodynamic design. It goes on to cover more advanced topics in helicopter aerodynamics, including airfoil flows, unsteady aerodynamics, dynamic stall, and rotor wakes, and rotor-airframe aerodynamic interactions, with final chapters on autogiros and advanced methods of helicopter aerodynamic analysis. Extensively illustrated throughout, each chapter includes a set of homework problems. Advanced undergraduate and graduate students, practising engineers, and researchers will welcome this thoroughly revised and updated text on rotating-wing aerodynamics.