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Author: Kalki Sharma Publisher: ISBN: Category : Languages : en Pages :
Book Description
In this thesis a noise prediction system is proposed for use in the design cycle of rotorcraft. The system is comprised of the design tool NASA Design and Analysis of Rotorcraft (NDARC), a noise prediction tool PSU-WOPWOP, and an intermediate tool called WOPIt. The system works by having NDARC set up the rotorcraft configuration for user specified constraints and analyze the performance for mission profiles and flight conditions, and then have PSU-WOPWOP perform the noise prediction for the configuration. The noise prediction is performed using first principles and semi-empirical models, and the tools of the system are chosen to perform tasks accurately and efficiently to allow for rapid turnaround of rotorcraft configurations by the designer. With the aid of this system, a designer can properly weigh the costs and benefits of a rotorcraft configuration based not only on performance data, but also upon its acoustic impact.
Author: Kalki Sharma Publisher: ISBN: Category : Languages : en Pages :
Book Description
In this thesis a noise prediction system is proposed for use in the design cycle of rotorcraft. The system is comprised of the design tool NASA Design and Analysis of Rotorcraft (NDARC), a noise prediction tool PSU-WOPWOP, and an intermediate tool called WOPIt. The system works by having NDARC set up the rotorcraft configuration for user specified constraints and analyze the performance for mission profiles and flight conditions, and then have PSU-WOPWOP perform the noise prediction for the configuration. The noise prediction is performed using first principles and semi-empirical models, and the tools of the system are chosen to perform tasks accurately and efficiently to allow for rapid turnaround of rotorcraft configurations by the designer. With the aid of this system, a designer can properly weigh the costs and benefits of a rotorcraft configuration based not only on performance data, but also upon its acoustic impact.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 456
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781722043780 Category : Languages : en Pages : 42
Book Description
This paper presents the test design, instrumentation set-up, data acquisition, and the results of an acoustic flight experiment to study how noise due to blade-vortex interaction (BVI) may be alleviated. The flight experiment was conducted using the NASA/Army Rotorcraft Aircrew Systems Concepts Airborne Laboratory (RASCAL) research helicopter. A Local Differential Global Positioning System (LDGPS) was used for precision navigation and cockpit display guidance. A laser-based rotor state measurement system on board the aircraft was used to measure the main rotor tip-path-plane angle-of-attack. Tests were performed at Crows Landing Airfield in northern California with an array of microphones similar to that used in the standard ICAO/FAA noise certification test. The methodology used in the design of a RASCAL-specific, multi-segment, decelerating approach profile for BVI noise abatement is described, and the flight data pertaining to the flight technical errors and the acoustic data for assessing the noise reduction effectiveness are reported. Chen, Robert T. N. and Hindson, William S. and Mueller, Arnold W. Ames Research Center RTOP 505-59-36...
Author: Oleksandr Zaporozhets Publisher: CRC Press ISBN: 0203888820 Category : Technology & Engineering Languages : en Pages : 432
Book Description
Aircraft noise has adverse impacts on passengers, airport staff and people living near airports, it thus limits the capacity of regional and international airports throughout the world. Reducing perceived noise of aircraft involves reduction of noise at source, along the propagation path and at the receiver. Effective noise control demands highly s
Author: Kalki Sharma
Author: Kalki Sharma
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Author: National Aeronautics and Space Administration (NASA)
Author: Oleksandr Zaporozhets
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