1 edition of Aircraft engine noise reduction found in the catalog.
Aircraft engine noise reduction
by Scientific and Technical Information Office, National Aeronautics and Space Administration; [for sale by the National Technical Information Service, Springfield, Va.] in Washington
Written in English
|Statement||Prepared at Lewis Research Center.|
|Series||NASA SP, -311, NASA SP ;, 311.|
|Contributions||Lewis Research Center.|
|LC Classifications||TL671.65 .A58|
|The Physical Object|
|Pagination||v, 317 p.|
|Number of Pages||317|
|LC Control Number||72603431|
Book Description 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 Reviews: 2. Both Vance Brand Airport in Longmont and the Boulder Municipal Airport have voluntary aircraft noise abatement recommendations. Citizens for Quiet Skies, however, said in .
Aircraft engine noise reduction. Washington, Scientific and Technical Information Office, National Aeronautics and Space Administration; [for sale by the National Technical Information Service, Springfield, Va.] (OCoLC) Material Type: Conference publication: Document Type: Book: All Authors / Contributors: Lewis Research Center. My next flirtation with noise was from a lesson taken in a PA from an aeroclub about 35 minutes away. I decided to have a backup and be ready to go in case my aircraft goes down for maintenance again. The cost wasn’t as bad as I thought ($/hr wet, fully insured with today’s exchange rate) and it is an aircraft rather similar to mine.
“Aircraft manufacturers, airlines, and aviation authorities in the U.S. are interested in reducing aviation noise by investigating new ways to reduce noise levels,” Fleming said. “There’s a focus on how aircraft design, operations, and land-use planning can reduce aviation noise. Noise reduction research has been summarized with participation of DLR which aims to reduce aircraft engine noise at the source, because this is the most effective and economical way to reduce noise. The main part of noise reduction potential can be seen in the Ultra- High Bypass Ratio (UHBR) engine concept where can be observed that the.
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A series of NASA flight tests has successfully demonstrated technologies that achieve a significant reduction in the noise generated by aircraft and heard by communities near : Sean Potter. Research into noise reduction has been extensive, examining factors like the amount of air travelling through the engines, the size of the fan blades in the engine, the position of the engine on the aircraft body and even the size and number of flaps that help control the wing shape.
Taxiway noise, SEL (dBA) for 7 aircraft operations, ranging from a small propeller aircraft to s was measured as the aircraft passed by the microphone setup (Table 7). Details of the T. Green measurements may be found in Appendix B.
Run up Measurements made at T.F. Green previously are also cited below. In general, aircraft noise sources can be separated into the two principal categories of engine and airframe noise.
Engine noise emission used to be the primary concern in the consideration of new commercial aircraft designs. However, since the s, it has been significantly reduced due to the implementation of the high bypass ratio Cited by: 1. 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.
For take-off operation, engine noise is the major contributor to the overall aircraft signature. Quieter the engine noise will be, greater the airframe noise contribution will be. Main engine noise.
As with jet exhaust noise, the final goal is to demonstrate a 6-dB reduction. Active Noise Control. A new approach to noise reduction is the active noise control effort. The primary principle of active noise control is to sense the noise disturbances in the engine and cancel them before they leave the engine.
The above charts showing arrival and departure noise are for jet powered aircraft, not the light aircraft in the OP's question. There are two sources of external noise, the prop and the engine exhaust. Noise from the prop is caused by its tips approaching supersonic speed.
An Overview of Aircraft Noise Reduction Technologies The aim of this article is to provide a broad overview of current and future noise reduction technologies used in aircraft industries.
It starts by recalling the regulation framework and the European incentives that. 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; noise exposure modeling and forecasting; the major sources of aircraft noise and their control; and. – Baseline current Air Force/Navy operational aircraft vibration and noise environments both cockpit and ground support/maintenance – Measure vibration and noise from F engine in F – Initiate human exposure effects expansion of limits and/or mitigation studies if required – Measure vibration and noise on JSF CDA variants.
Language: English. Brand new Book. Technologies for aircraft noise reduction have been developed by NASA over the past 15 years through the Advanced Subsonic Technology (AST) Noise Reduction Program and the Quiet Aircraft Technology (QAT) project.
This presentation summarizes highlights from these programs and anticipated noise reduction. Located in the tail of most aircraft is a small jet engine called an APU (auxiliary power unit). The APU provides electrical power and air conditioning on the ground.
Being a jet engine, the APU makes a characteristic jet engine noise that one may hear from the cabin. Engine noise is one of the major contributors to the overall sound levels as aircraft operate near airports.
Turbofan engines are commonly used on commercial transports due to their advantage for higher performance and lower noise. The noise reduction comes from combinations of changes to the engine cycle parameters and low noise design features.
The present invention is directed toward a unique lift-generated noise reduction apparatus. This apparatus includes a plurality of tip fences that are secured to the trailing and leading assemblies of the high-lift system, as close as possible to the discontinuities where the vortices are most likely to form.
In one embodiment, these tip fences are secured to some or all of the outboard and. Design requirements such as fuselage and wing shape, along with variations in engine characteristics, have different effects on airplane noise than that of typical subsonic aircraft.
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.
In addition to reviewing the sociological aspects, Smith offers a broad understanding of the problem of aircraft noise and its control.
The book. Historical progress in noise reduction and technologies available for future aircraft/engine development are identified. Technologies address aircraft/engine components including fans, exhaust nozzles, landing gear, and flap : Dennis L.
Huff. The problem of characterizing aircraft noise both for regulatory and engineering purposes is described in section 2. The complex balance between different engine and airframe sources as they contribute to whole aircraft noise is described in section 3. The current state of prediction methods and noise reduction technologies are outlined in.
In a typical turbofan engine, fan and exhaust noise  are among the major components of the noise signature of an aircraft. The use of large fans and inlet ducts means that fan noise is nowadays. Aircraft engine emissions and airport noise are complex subject matters under study for decades and are still the focus of many research efforts today.
Here you will find information about engine emissions, aircraft and airport noise, and who to contact if you have a question, concern, or complaint about noise issues.This reduction has been achieved as a result of the development of turbofan engines with high bypass ratios, liner technology and turbomachinery source noise reduction.
Further aircraft noise reduction will be achieved from improved design of engine systems, decrease in airframe sources and the introduction of noise reduction technologies.Today, most GA aircraft in Europe do have mufflers so they can pass the ever more stringent noise requirements.
Here is one mounted to a Cessna (picture source). Historically, mufflers were considered as a disadvantage because they reduce engine performance by increasing back partially blocking the exhaust flow, the muffler increases cylinder pressure on the last upstroke of.