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Author: Publisher: ISBN: 9780309374965 Category : Airplanes Languages : en Pages : 4
Book Description
"TRB's Airport Cooperative Research Program (ACRP) Research Results Digest 24: Recommended Community Noise Model Enhancements to Improve Prediction of Helicopter Activity Impacts provides an overview of research conducted to identify improvements to the most common methods for predicting helicopter community noise, including the research tasks, findings, final conclusions, and next steps. While the research did not attempt to identify which noise metric best predicts annoyance, it offers a computational methodology from which suggested metrics may be accurately determined." -- Publisher's description
Author: Publisher: ISBN: 9780309374965 Category : Airplanes Languages : en Pages : 4
Book Description
"TRB's Airport Cooperative Research Program (ACRP) Research Results Digest 24: Recommended Community Noise Model Enhancements to Improve Prediction of Helicopter Activity Impacts provides an overview of research conducted to identify improvements to the most common methods for predicting helicopter community noise, including the research tasks, findings, final conclusions, and next steps. While the research did not attempt to identify which noise metric best predicts annoyance, it offers a computational methodology from which suggested metrics may be accurately determined." -- Publisher's description
Author: Lauren Weist Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Rotorcraft are a versatile and important class of vehicles within the aerospace industry, but they experience a highly varied aerodynamic environment that causes unique acoustic conditions. These acoustics are highly tonal, and are often found to cause community annoyance. Due to this, providing acoustic considerations for rotorcraft is a necessary area of research within the industry. To aid in these considerations, this thesis addresses noise via modeling through two noise prediction systems (NPS). To account for rotorcraft acoustics in the design stage, a low fidelity NPS, the NDARC NPS, was used. For acoustic considerations of existing helicopters, the high fidelity Penn State NPS is used. The low fidelity system, the NDARC NPS, is described first. As acoustic consideration in the design stage is not often conducted, development of a rapid tool to give to a designer is paramount. The NDARC NPS was created to fill this desire, and has been further developed as a part of this thesis. The NDARC NPS was fully exercised to identify issues and improve the system. Improvements to the blade-vortex interaction model, comprised of the Beddoes wake model and Vatistas implementation of the Biot-Savart law were completed. Improvements were made to the user interface, the complete suite of example cases was improved and expanded, and the User's Manual was completed. The mid-fidelity system, known as the Penn State NPS, is used to aid in providing guidance on noise abatement procedures for existing vehicles to aid in the reduction of community annoyance.In this work, the Penn State NPS was used to conduct several studies on the effects of real flight variations on noise. First, a study of longitudinal and vertical accelerations through the lens of flight path angle were conducted for the Sikorsky S-76D helicopter to understand how flight path angle and flight path angle rate changes can effect noise. Then, a study of helicopter configuration and the impact of weight and number of blades on noise was conducted. Four vehicles, the Sikorsky S-76D, the Bell 205, the Bell 407, and the Bell 206 were all analyzed in descent to understand how vehicle configuration influences noise.
Author: Vincent Mestre Publisher: ISBN: 9780309446631 Category : Airplanes Languages : en Pages : 135
Book Description
"This report explores what is currently known about community annoyance of helicopter noise. It describes a protocol for conducting a large-scale community survey to quantify annoyance due to civil helicopter noise and presents the results of a test of the protocol which also helped improve understanding of the roles of acoustic and non-acoustic factors that influence community annoyance to civil helicopter noise. The report should be of particular interest to airport industry practitioners, community planners, and researchers who desire a better understanding of the factors affecting community annoyance with helicopter noise and possible differences between helicopter noise impacts and fixed-wing aircraft noise impacts."--Publisher.
Author: Publisher: ISBN: Category : Languages : en Pages : 104
Book Description
The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.
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