Download or read book Method to Calculate Behind Start of Takeoff Roll Noise Level Adjustments written by A-21 Aircraft Noise Measurement Aviation Emission Modeling and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document describes a method to calculate noise level adjustments at locations behind an airplane (described by an angular offset or directivity) at the start of takeoff roll (SOTR). This method is derived from empirical data from jet aircraft (circa 2004), most of which are configured with wing-mounted engines with high by-pass ratios (Lau, et al., 2012). Methods are also described which apply to modern turboprop aricraft.Calculations of other propagation-related adjustments required for aircraft noise prediction models are described in AIR1845A, ARP5534, ARP866A, and AIR5662. This AIR describes a method to calculate noise level adjustments at locations behind an airplane at the start of takeoff roll (SOTR) for the purposes of aircraft noise prediction modeling. This method replaces the methods found in paragraph 3.3.1 (Sound Exposure Level Behind the Start-of-Takeoff Roll) of AIR1845A "Procedure for the Calculation of Airplane Noise in the Vicinity of Airports". Specifically, the calculations presented in 3.1 and 3.2 of this document replace the calculations in Step 3 of paragraph 3.3.1 of AIR1845A. It adheres to the basic approach described in AIR1845A and is based on measurements from modern jet and turboprop aircraft (circa 2004). The behind start of takeoff roll noise directivity method found in AIR1845A is based on measurements of older-generation (circa 1980), low by-pass ratio aircraft, primarily configured with fuselage-mounted engines. The new method described herein for modeling the noise directivity behind start of takeoff roll is derived from empirical data from modern jet aircraft, most of which are configured with wing-mounted engines that tend to have higher by-pass ratios as well as operate at higher thrust levels. Additionally, this AIR version includes a separate directivity adjustment for propeller-driven aircraft. Comparison of directivity adjustments computed from the method described herein and the AIR1845A method are presented in Appendix A. AIR6297 has been reaffirmed to comply with the SAE Five-Year Review policy.
Download or read book Calculation of Sideline Noise Levels During Takeoff Roll written by John F. Mills and published by . This book was released on 1976 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report discusses an improved analytical approach for computing the sideline noise generated by aircraft during takeoff roll. The relationship accounts for the effects of acceleration on the typical shape of noise radiation pattern from a static full-power ground runup. This simplified model is suitable for hand calculations or direct implementation into NOISEMAP, the computerized procedure used by the Air Force to generate contours of equal noise exposure about airbases resulting from aircraft flight and ground runup operations. For the Boeing 707-300 aircraft, the new, simplified model yielded results within 0.5 dB of those obtained with more complex computational procedures involving the effects of forward speed on the jet noise output.
Download or read book Method for Modeling Line of Sight Blockage of Aircraft Noise written by A-21 Aircraft Noise Measurement Aviation Emission Modeling and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document describes methods for calculating the attenuation of sound due to line-of-sight blockage or shielding from non-level terrain. This method applies to sound propagating from an airplane to locations on the ground during ground roll, climbout after liftoff, and landing operations.AIR1845 and AIR5662 provides guidance for modeling aircraft noise at airports with flat terrain. In reality, many airports are surrounded by non-level terrain that may result in attenuation (or shielding) of sound at some receptors. This noise blockage can be accounted for with the line-of-sight blockage calculation, based on the difference in propagation path length between the direct path and propagation path over the top of terrain feature. The purpose of this aircraft information report is to provide a method that accounts for the attenuation due to line-of-sight blockage of aircraft noise by terrain features. This Aerospace Information Report (AIR) describes a method to calculate noise level adjustments due to line-of-sight blockage (LOS) of the noise propagation between a source and receiver by terrain for the purposes of aircraft noise prediction modeling.AIR1845 provides guidance for modeling aircraft noise at airports with flat terrain. In reality, many airports are surrounded by non-level terrain that may result in noise blockage (or shielding) at some nearby receptors. This noise blockage can be accounted for with the line-of-sight blockage calculation, based on the difference in propagation path length between the direct path (straight line between source and receiver, terrain feature absent) and the propagation path over or around the terrain feature.
Download or read book Behind Start of Take Off Roll Aircraft Sound Level Directivity Study written by Michael C. Lau and published by Createspace Independent Publishing Platform. This book was released on 2012-12-31 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The National Aeronautics and Space Administration (NASA), Langley Research Center (LaRC) and the Environmental Measurement and Modeling Division of the United States Department of Transportation's John A. Volpe National Transportation Systems Center (Volpe) conducted a noise measurement study to examine the sound level directivity pattern behind aircraft start-of-takeoff roll. This report discusses the procedures and methodologies used to measure and quantify data acquired from the Study.
Download or read book Code of Federal Regulations written by and published by . This book was released on 2017 with total page 1136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special edition of the Federal Register, containing a codification of documents of general applicability and future effect ... with ancillaries.
Download or read book Code of Federal Regulations Title 14 Aeronautics and Space written by and published by Government Printing Office. This book was released on 2011-04-21 with total page 1086 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Medical Service Digest written by and published by . This book was released on 1982 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Behind Start of Take off Roll Aircraft Sound Level Directivity Study Revision 1 written by Michael C. Lau and published by . This book was released on 2012 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The National Aeronautics and Space Administration (NASA), Langley Research Center (LaRC) and the Environmental Measurement and Modeling Division of the United States Department of Transportation's John A. Volpe National Transportation Systems Center (Volpe) conducted a noise measurement study to examine the sound level directivity pattern behind aircraft start-of-takeoff roll. This report discusses the procedures and methodologies used to measure and quantify data acquired from the Study. This is a revision to the December 2012 that addresses a rounding error in equation 4 (Section 5.4) and the supporting text in Section 5 and Appendix F.
Download or read book The Code of Federal Regulations of the United States of America written by and published by . This book was released on 1992 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Code of Federal Regulations is the codification of the general and permanent rules published in the Federal Register by the executive departments and agencies of the Federal Government.
Download or read book Code of Federal Regulations written by United States. Internal Revenue Service and published by . This book was released on 1993 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special edition of the Federal register, containing a codification of documents of general applicability and future effect as of April 1 ... with ancillaries.
Download or read book California Court of Appeal 1st Appellate District Records and Briefs written by California (State). and published by . This book was released on with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Toledo Express Airport Airport Layout Plan Air Cargo Hub Toledo written by and published by . This book was released on 1990 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Noise Measurement Evaluation of Takeoff and Approach Profiles Optimized for Noise Abatement written by H. Rodney Peery and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book FAR AIM 2017 written by Federal Aviation Administration and published by Simon and Schuster. This book was released on 2016-08-09 with total page 1340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn to fly a plane according to Federal Aviation Administration (FAA) regulations The most complete guide to the rules of aviation accessible anywhere Contains all of the information needed to operate safely in US airspace and is fully updated If you are an aviation enthusiast or an aviator, you need to have the newest edition of the FAR/AIM. In the most recent edition of the FAR/AIM, produced by the FAA, all procedures, illustrations, and regulations are up-to-date and reflect current FAA data. Learn about takeoffs and landings, land navigation, how to aid climb, world flight patterns, flying rolls, academic liftoff, and more. This useful reference book is a critical resource for all members of the aviation community, including aspiring pilots seeking a concrete background in the rules, procedures, and requirements of flight training. This manual also includes: A study guide for specific pilot training certifications and ratings Standard instrument procedures A pilot/controller glossary Parachute operations The NASA Aviation Safety reporting form Airworthiness standards for products and parts Important FAA contact information
Download or read book I 284 Construction from I 84 in East Hartford to I 291 in South Windsor written by and published by . This book was released on 1982 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book BNA Noise Regulation Reporter written by and published by . This book was released on 1987 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Aircraft Noise Levels in the Vicinity of Start of takeoff Roll at Baltimore Washington International Airport written by Richard D. Horonjeff and published by . This book was released on 1992 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sound level prediction accuracy of the Federal Aviation Administration's Integrated Noise Model (INM) is receiving closer scrutiny today than at its inception due to a shifting emphasis in the model's application. In addition to the traditional land use planning application, the INM is now used as resource arbiters for local and federally funded noise mitigation programs. The increased model scrutiny has led to a reinspection of modeling assumptions in the vicinity of start-of-takeoff roll and the subsequent need for a well documented empirical database. This study focused on the gathering of such a database. The completed database consists of measured sound exposure levels (SELs) and maximum A-weighted sound levels at five sites in the hemicircle behind the aircraft at brake release and at distances of 2,000 to 4,000 ft from the brake release point. Independent variables include measurement site/runway geometry, aircraft type, engine type, aircraft gross weight, wind speed and direction, temperature, relative humidity, barometric pressure, aircraft ground roll distance versus time. and time to liftoff. This information is all contained in standard dBase lll database files. Findings shown in this report include the effects on SEL of wind speed and direction, and the interaction effects of wind speed direction and measurement site location. Also discussed are comparisons of measured SELs and the predicted values of INM Version 3.10.
