Download or read book MEASUREMENT OF EXTERIOR NOISE PRODUCED BY AIRCRAFT AUXILIARY POWER UNITS APUs AND ASSOCIATED EQUIPMENT DURING GROUND OPERATION written by A-21 Aircraft Noise Measurement Aviation Emission Modeling and published by . This book was released on 1979 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Test procedures are described for measuring noise at specific locations (passenger and cargo doors, and servicing positions) and for conducting general noise surveys around aircraft.Requirements are identified with respect to instrumentation; acoustic and atmospheric environment; data acquisition, reduction and presentation, and such other information as is needed for reporting the results.Recommended procedures involve recording data on magnetic tape for subsequent processing. The use of tape-recorder/time-integrating analyzer systems avoids the need to average by eye the variations associated with manual readings from sound level meters and octave band analyzers and therefore yields more accurate results.This document makes no provision for predicting APU noise from basic engine characteristics, nor for measuring noise of more than one aircraft operating at the same time.No attempt is made to suggest acceptable levels of noise or suitable subjective criteria for judging acceptability.

Download or read book Measurement of Exterior Noise Produced by Aircraft Auxiliary Power Units APUs and Associated Aircraft Systems During Ground Operation written by A-21 Aircraft Noise Measurement Aviation Emission Modeling and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Test procedures are described for measuring noise at specific receiver locations (passenger and cargo doors, and servicing positions) and for conducting general noise surveys around aircraft. Procedures are also described for measuring noise level and directivity at noise source locations to facilitate the understanding and interpretation of the data.Requirements are identified with respect to instrumentation; acoustic and atmospheric environment; data acquisition, reduction and presentation, and such other information as is needed for reporting the results.This document makes no provision for predicting APU or component noise from basic engine characteristics or design parameters, nor for measuring noise of more than one aircraft operating at the same time.No attempt is made to suggest acceptable levels of noise or suitable subjective criteria for judging acceptability. ICAO Annex 16 Volume I Attachment C provides guidance on recommended maximum noise levels. This document has been updated and expanded to reflect current instrumentation and test practices for measurement and analysis of noise from APUs and associated equipment.

Download or read book Index to Noise Standards written by Marilyn A. Cadoff and published by . This book was released on 1984 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalog of American National Standards written by American National Standards Institute and published by . This book was released on 1995 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalog of American national standards 1994 written by and published by . This book was released on 1994 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1985 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 1989 1990 Catalog of American National Standards written by American National Standards Institute and published by . This book was released on 1989 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of Exterior Sound Level of Specialized Aircraft Ground Support Equipment written by AGE-3 Aircraft Ground Support Equipment Committee and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The scope of this SAE Recommended Practice covers specialized internal combustion engine powered equipment used in support of aircraft operations. The equipment may be self-propelled, truck mounted, trailer mounted, skid mounted or stationary. It does not include construction equipment or equipment designed primarily for operation on highways or within factories or building areas.NOTE: Equivalent methodology is provided in (CEN) EN 1915-4, Aircraft ground support equipment - General requirements - Part 4: Noise measurement methods and reduction, to be used for measurements conforming to the EU Machinery Directive ARP1801A has been reaffirmed to comply with the SAE five-year review policy.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1978 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book S A E Transactions written by Society of Automotive Engineers and published by . This book was released on 1981 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beginning in 1985, one section is devoted to a special topic

Download or read book An In depth Analysis of Factors Influencing Pilots Selection Between Auxiliary Power Units and External Ground Power Units in the Aviation Industry and Tactical Recommendations for Optimized Usage in a Medium Size Lebanese Airline with a Fleet of Airbus A320 written by Elie Souaid and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the aviation industry, auxiliary power units (APUs) and ground power units (GPUs) are essential in airplane's ground powering. APUs are onboard power sources, while GPUs are external power sources. The main difference between them lies in their location and design. APUs are jet engines mounted on the aircraft, producing electricity and air whenever needed in the air or on the ground (Skybrary, 2023) [1]. Meanwhile, the GPUs are offboard power sources and power the plane without needing an APU. They are diesel engines or inverters connected to the airport power grid. Based on this key difference, this paper investigates the advantages of using GPUs over APUs in an airline based in Lebanon and flying to Europe, the Middle East, and the Gulf region. Furthermore, the APU runs on jet fuel and typically represents about 2 to 2.5% of an airline’s fuel consumption, whereas worldwide, the aviation industry emits 2.4% of total CO2 emissions (Overton, 2022)[2]. Therefore, the focus is on optimizing costs, emissions, and noise. By analyzing different alternatives and scenarios, this study aims to enable informed decision-making at each destination, considering local regulations, weather data, equipment prices, fuel prices, and maintenance costs. This paper includes a detailed questionnaire completed by flight crew, engineers, and ground personnel to uncover valuable insights. A knowledge gap was found regarding the differences between APUs and GPUs and the associated costs. Furthermore, the research reveals inefficiencies in APU usage, leading to unnecessary fuel consumption. Additionally, cost savings were observed by using the GPU instead of APU, with some destinations offering the GPU free of charge during the initial hours or as part of prepaid bundles. On top of that, by turning off the APU, the study shows potential improvements in employee satisfaction, comfort, communication, concentration, and safety. In parallel, the study highlights the importance of training employees to understand the differences in prices and impacts between APUs and GPUs, enabling clear accountability and adherence to defined policies. This thesis unites all the latter factors into one calculation matrix by following the Multi-Attribute Utility Theory (MAUT). In addition, it suggests a framework to assist airlines in selecting the best power source alternative. In conclusion, this comprehensive analysis bridges the gap in the statistical cost analysis and the gap in decision-making. Integrating numbers, perspectives, safety considerations, and organizational behavior provides airlines with a well-rounded framework for corporate-informed decision-making. The research's goal is to facilitate the optimization of operational efficiency, environmental sustainability, and the well-being of employees, ultimately shaping the future of aviation and benefiting both the industry and the environment.

Download or read book USAF Bioenvironmental Noise Data Handbook Volume 145 F 106B In Flight Crew Noise written by Harald K. Hille and published by . This book was released on 1979 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides measured data defining the bioacoustic environments produced inside the aircraft. Such data are essential to evalaute ear protection requirements, limiting personnel exposure times, voice communication capabilities, and annoyance problems associated with operations of the F-106B aircraft. This volume is one of a series published by the Aerospace Medical Research Laboratory (AMRL) under the same report number (AMRL-TR-75-50) as a multi-volume handbook that quantifies the noise environments produced at flight/ground crew locations and in surrounding communities by operations of Air Force aircraft and ground support equipment. The far-field, community-type, noise data in the handbook describe the noise produced during ground operations of aircraft, ground support equipment, and other ground-based equipment or facilities. Volume 1 of this handbook discusses the objectives and design of the handbook, the types of data presented, measurement procedures, instrumentation, data processing, definitions of quantities, symbols, equations, applications, limitations, etc. Refer to Volume 1 (reference 1) for such information because it is not repeated in other handbook volumes. A cumulative index lists those aerospace systems contained in the handbook, and identifies the specific volumes containing each type of environmental noise data available (i.e., in-flight/flight crew and passenger noise, near-field/ground crew noise, far-field/community noise). Volume numbers are assigned sequentially as individual volumes are published. This index is periodically updated as individual volumes are published, and is avaialble upon request from AMRL/BBE, Wright-Patterson AFB, OH 45433.

Download or read book Uniform Practices for the Measurement of Aircraft Noise written by Aircraft Industries Association of America and published by . This book was released on 1952 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transportation Noise Reference Book written by P. M. Nelson and published by Butterworth-Heinemann. This book was released on 1987 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Archives of Acoustics Quarterly written by and published by . This book was released on 2001 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book USAF Bioenvironmental Noise Data Handbook Volume 124 F 104D Aircraft Near and Far Field Noise written by Robert G. Powell and published by . This book was released on 1979 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides measured and extrapolated data defining bioacoustic environments produced by this aircraft during ground runup operations. Such data are essential to evaluate ear protection requirements, limiting personnel exposure times, voice communication capabilities, and annoyance problems associated with ground runups of the F-104D aircraft. This volume is one of a series published by the Aerospace Medical Research Laboratory (AMRL) under the same report number (AMRL-TR-75-50) as a multi-volume handbook that quantifies the noise environments produced at flight/ground crew locations and in surrounding communities by operations of Air Force aircraft and ground support equipment. The far-field, community-type, noise data in the handbook describe the noise produced during ground operations of aircraft, ground support equipment, and other ground-based equipment or facilities. Volume 1 of this handbook discusses the objectives and design of the handbook, the types of data presented, measurement procedures, instrumentation, data processing, definitions of quantities, symbols, equations, applications, limitations, etc. Volume 2 provides a method and data for adjusting the handbooks's far-field noise data, which are for standard meteorological conditions (15 C temperature, 70% rel humidity, 0.760 meters Hg barometric pressure), to derive comparable data for other meteorological conditions. Refer to Volumes 1 and 2 (references 1 and 2) for such information because it is not repeated in other handbook volumes.

Download or read book MEASUREMENTS OF AIRCRAFT EXTERIOR NOISE IN THE FIELD written by A-21 Aircraft Noise Measurement Aviation Emission Modeling and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: