Last edited by Dasida
Sunday, August 2, 2020 | History

4 edition of Technology to reduce aircraft noise found in the catalog.

Technology to reduce aircraft noise

United States

Technology to reduce aircraft noise

Hearing before the Committee on Science, Subcommittee on Technology, U.S. House of Representatives, One Hundred Fifth Congress, first session, October 21, 1997

by United States

  • 356 Want to read
  • 39 Currently reading

Published by For sale by the U.S. G.P.O., Supt. of Docs., Congressional Sales Office .
Written in English


The Physical Object
Number of Pages108
ID Numbers
Open LibraryOL7376941M
ISBN 100160563763
ISBN 109780160563768
OCLC/WorldCa39142354

  Noise Reduction Technologies for Turbofan Engines Significant progress continues to be made with noise reduction for turbofan engines. NASA has conducted and sponsored research aimed at reducing noise from commercial aircraft. Since it takes many years for technologies to be developed and implemented, it is important to have aggressive technology goals that lead the target entry into . U.S. government, industry, and universities conduct research and develop technology that could help reduce aircraft noise and emissions-but only if the results are .

  The aircraft was modified on its flap and main landing gear with further optimized noise reduction designs from the first flight demonstration. The project focuses on noise reduction of flap (or high-lift device) noise and landing gear noise which are the major sources of aircraft noise during approach to airports.   Hexcel, a global leader in advanced composite technology, has been at the forefront of acoustic technology development with its Acousti-Cap® broadband sound-reducing honeycomb, which enables engine designers to reduce the noise from takeoffs and landings yet without adding significant weight to the aircraft.

technology that can be used to reduce aircraft noise levels by 10 dB relative to technology. In order to measure progress toward achieving this overall objectiveand to evaluate the results of individual program elements--the following requirements were defined by the Technical. NASA Tests Quieter Landing Gear Technology.


Share this book
You might also like
Abstracts of early deeds of Edgecombe County, North Carolina

Abstracts of early deeds of Edgecombe County, North Carolina

A comparison of the efficiency of modified galvanic skin response audiometry with that of traditional galvanic skin response and traditional puretone audiometry in the measurement of auditory responses of subjects with normal hearing, perceptively impaired hearing and with functional hearing disorders

A comparison of the efficiency of modified galvanic skin response audiometry with that of traditional galvanic skin response and traditional puretone audiometry in the measurement of auditory responses of subjects with normal hearing, perceptively impaired hearing and with functional hearing disorders

The Beautiful Northwest

The Beautiful Northwest

The spirit of calligraphy.

The spirit of calligraphy.

Outdoor senior scouting near Sydney.

Outdoor senior scouting near Sydney.

Painting and sculpture of the Puerto Ricans

Painting and sculpture of the Puerto Ricans

The Mystery of the Broken Emerald

The Mystery of the Broken Emerald

The last two elves in Denmark.

The last two elves in Denmark.

Deaf mosaic

Deaf mosaic

Un Delitto di classe

Un Delitto di classe

Peter Russell Seminar, 1981-82

Peter Russell Seminar, 1981-82

Individual biographical factors of entering freshmen and their relationships to first quarter grade point averages.

Individual biographical factors of entering freshmen and their relationships to first quarter grade point averages.

Outward bound

Outward bound

Some account of the wars, extirpation, habits etc. of the native tribes of Tasmania.

Some account of the wars, extirpation, habits etc. of the native tribes of Tasmania.

Significant features of fiscal federalism.

Significant features of fiscal federalism.

Technology to reduce aircraft noise by United States Download PDF EPUB FB2

In order to set noise Standards, an understanding of current research and technology development is imperative. Technological progress continues to push the aviation community to delivering on the ICAO goal of limiting or reducing the number of people affected by significant aircraft noise.

Technology to reduce aircraft noise: hearing before the Committee on Science, Subcommittee on Technology, U.S. House of Representatives, One Hundred Fifth Congress, first session, Octo Author. Aircraft Noise traces the origins of this problem to the introduction of the jet engine into the airline fleet in the late s and describes the legal restrictions now placed on the industry.

It explains the derivation of the special noise units and assessment scales now used around the world/5(2). If you live near the airport or have been at the house of a relative or a friend who lives near the airport then you may have felt that they have to deal with many problems with the loud sound of the aircraft in their daily lives.

This solution is no. Since the invention of the jet engine, aircraft manufacturers, aerospace engineers and airlines have taken strides to reduce noise emitted from aircraft by leveraging new technology.

Engine technologies such as high-bypass ratio and very-high-bypass ratio turbofans have significantly improved noise emissions across the United States.

Performance-Based navigation (PBN) is another strategy that can help reduce aviation noise. PBN couples satellite technology with advanced avionics to create precise 3-D flight paths.

To reduce noise, airports use PBN in an effort to route aircraft to minimize population impact. NASA combined three technologies, including Landing Gear Noise Reduction, landing gear cavity treatments, and the Adaptive Compliant Trailing Edge flexible wing flap, to demonstrate a. Indo-Asian News Service IST.

Aiming to reduce aircraft noise for communities that live near airports, NASA has successfully tested new noise reduction technologies on a series of Acoustic Research Measurement (ARM) flight, and managed to cut airframe noise during landing by more than 70 percent.

The FAA standard for aircraft noise is the EPNdB (or effective perceived noise dB—a measure that is weighted to reflect the particular range of sounds generated by aircraft).

NASA aims to develop the technology to reduce commercial aircraft noise by 10 EPNdB by and another 10 EPNdB by outlined, and the use of Effective Perceived Noise Level (EPNL) as a measure of aircraft noise is related to the engineering task of developing technologies to reduce noise.

The considerable progress that has been made in reducing aircraft noise over the last four decades is reviewed and. This chapter focuses on the technology for reducing aircraft noise. Aircraft noise can be reduced by engineering measures aimed at the power plant and other aircraft components, by operational measures aimed at modifying the operation of the aircraft so as to reduce noise, and by zoning, insulation and other measures aimed at reducing the.

Aircraft noise is second only to road traffic noise in drawing complaints from the public about noise pollution. Therefore intensive research efforts are necessary on the national levels as well as the European level to reduce the noise load around airports.

The most effective and economical way to reach this goal is noise reduction at the source. Significant reduction in aircraft noise must be realized in order for air transportation growth to maintain its current trend.

The reduction of airframe noise using NASA technology is an important achievement in this effort, as it may lead to quieter aircraft, which will benefit communities near airports and foster expanded airport operations.

technology to reduce aircraft noise page 54 prev page top of doc hearing before the committee on science subcommittee on technology u.s. house of representatives one hundred fifth congress first session octo [no. xx] printed for the use of the committee on science committee on science f. james sensenbrenner, jr., wisconsin, chairman.

Nasa has tested three new noise reduction technologies on a series of Acoustic Research Measurement (ARM) flights in a bid to reduce aircraft noise.

Nasa combined three technologies, including landing gear noise reduction, landing gear cavity treatments, and the adaptive compliant trailing edge flexible wing flap, and successfully reduced airframe noise by more than 70%.

Reducing aircraft noise with NASA technology. To combat rising concerns of aircraft noise as a result of demand for faster air travel, NASA’s Armstrong Flight Research Center in California, US, has developed and demonstrated airframe optimisation technology that could reduce aircraft noise by up to 70%.

NASA combined three technologies, including Landing Gear Noise Reduction, landing gear cavity treatments, and the Adaptive Compliant Trailing Edge flexible wing flap, to demonstrate a reduction in airframe noise in excess of 70 percent.

This may reduce. "NASA's goal here was to reduce aircraft noise substantially in order to improve the quality of life for communities near airports. We are very. It stipulates that new aircraft models need to be at least seven decibels quieter than those built to the previous Chapter 4 standard.

This ensures the quietest technology will be used on future aircraft. The certification was one of several measures to reduce engine noise. 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.

A study from MIT finds that slowing down planes as they take off from urban centers helps keep the noise down. Unfortunately, it also burns more fuel.Additionally, noise technology goals have been developed, in a with the purpose of providing stretch yet reasonable targets for industry R&D to aim at, in cooperation with States.

More details on these ICAO initiatives on aircraft noise are provided in the following pages: Noise Trends. Technology Goals. Noise Reduction Technologies. NASA has concluded a flight test series to investigate technologies that may significantly reduce airframe noise for communities near airports.

The flights, which gathered data that will be used.