Tradeoff of Airframe Noise and Field Length in Conceptual Design of Airliner

2013 ◽  
Vol 295-298 ◽  
pp. 2026-2029 ◽  
Author(s):  
Manandhar Ashish ◽  
Shuai Zhang ◽  
Xiong Qing Yu
Keyword(s):  
Conceptual Design ◽  
Noise Level ◽  
Aircraft Noise ◽  
Noise Prediction ◽  
Noise Levels ◽  
Wing Area ◽  
Airframe Noise ◽  
Prediction Program ◽  
Noise Signature

The purpose of this paper is to present a tradeoff study of airframe noise and field length due to wing area and flap setting configuration during conceptual design. The aircraft takeoff and landing length is predicted by the Matlab synthesis code for airliner conceptual design. The NASA’s Aircraft Noise Prediction Program (ANOPP) is used to evaluate the airframe noise signature. It is found that: (1) with the increase in wing area both the landing and takeoff field length will be reduced, and approach noise decreases whereas the takeoff noise increases; (2) with the increase in flap setting from 50 to 200, both landing and takeoff field length reduces but the noise level increases during takeoff and decreases during the approach. The results can help designers to select suitable values of wing area and flap setting to meet both the requirements of field length and noise levels.

scholarly journals Full-Scale Tests for Assessing Blasting-Induced Vibration and Noise

2018 ◽  
Vol 2018 ◽  
pp. 1-14
Author(s):  
Chung-Won Lee ◽  
Jiseong Kim ◽  
Gi-Chun Kang
Keyword(s):  
Noise Level ◽  
Full Scale ◽  
Noise Prediction ◽  
Square Root ◽  
Infrastructure Development ◽  
Full Scale Test ◽  
Noise Levels ◽  
Tunnel Excavation ◽  
Scale Test ◽  
Full Scale Tests

Vibration and noise problems caused by a number of construction processes, specifically blasting for infrastructure development, are becoming important because of their civil appeal. In this study, a square root equation (SRE) with a 95% confidence level was proposed for predicting blasting-induced vibration through full-scale test blasting, and the vibration value predicted from this equation was located between the values predicted from the USBM (US Department of Interior, Bureau of Mines), NOF (Nippon Oil & Fats Co., Ltd.), and MCT (Ministry of Construction and Transportation) equations. Additionally, by comparing the measured noise level at full-scale test blasting with the calculated noise levels from several noise prediction equations, it was determined that the noise level predicted by the ONECRC equation had the best agreement with the measured results. However, in cases where blasting includes tunnel excavation, simultaneous measurement of vibration and noise is required to prevent damage to the surrounding facilities.

scholarly journals Guidelines for the LTO Noise Assessment of Future Civil Supersonic Aircraft in Conceptual Design

Aerospace ◽  
2022 ◽  
Vol 9 (1) ◽  
pp. 27
Author(s):  
Grazia Piccirillo ◽  
Nicole Viola ◽  
Roberta Fusaro ◽  
Luigi Federico
Keyword(s):  
Conceptual Design ◽  
Aircraft Design ◽  
Low Noise ◽  
Aircraft Noise ◽  
Noise Model ◽  
Noise Power ◽  
Community Noise ◽  
Prediction Program ◽  
Supersonic Aircraft ◽  
Noise Assessment

One of the most critical regulatory issues related to supersonic flight arises from limitations imposed by community noise acceptability. The most efficient way to ensure that future supersonic aircraft will meet low-noise requirements is the verification of noise emissions from the early stages of the design process. Therefore, this paper suggests guidelines for the Landing and Take-Off (LTO) noise assessment of future civil supersonic aircraft in conceptual design. The supersonic aircraft noise model is based on the semi-empirical equations employed in the early versions of the Aircraft NOise Prediction Program (ANOPP) developed by NASA, whereas sound attenuation due to atmospheric absorption has been considered in accordance with SAE ARP 866 B. The simulation of the trajectory leads to the prediction of the aircraft noise level on ground in terms of several acoustic metrics (LAmax, SEL, PNLTM and EPNL). Therefore, a dedicated validation has been performed, selecting the only available supersonic aircraft of the Aircraft Noise and Performance database (ANP), that is, the Concorde, through the matching with Noise Power Distance (NPD) curves for LAmax and SEL, obtaining a maximum prediction error of ±2.19%. At least, an application to departure and approach procedures is reported to verify the first noise estimations with current noise requirements defined by ICAO at the three certification measurement points (sideline, flyover, approach) and to draw preliminary considerations for future low-noise supersonic aircraft design.

Prediction of Urban Air Mobility Multirotor VTOL Broadband Noise Using UCD-QuietFly

2021 ◽  
Author(s):  
Sicheng (Kevin) Li ◽  
Seongkyu Lee
Keyword(s):  
Amplitude Modulation ◽  
Noise Level ◽  
Background Noise ◽  
Prediction Method ◽  
Broadband Noise ◽  
Urban Air ◽  
Noise Prediction ◽  
Vehicle Noise ◽  
Trailing Edge Noise ◽  
Prediction Program

This paper investigates broadband noise of multirotor urban air mobility (UAM) vertical take-off and landing (VTOL) vehicles. Based on an earlier single-rotor trailing-edge noise prediction method, a multirotor broadband noise prediction program is developed, where the multirotor coordinate transformation is included, and the amplitude modulation capability is introduced. Thereafter, the program is used to predict broadband noise from three UAM VTOL conceptual designs and a vertiport conceptual design. It is found that UAM VTOL vehicles' broadband noise is important in the high-frequency range, where the community background noise level is typically low. For the same mission specifications, broadband noise is found to be higher for VTOL designs with more rotors. UAM vehicle noise is compared to conventional helicopter noise. It is found that the amplitude modulation of broadband noise of a single rotor is insignificant when the observer distance is larger than four rotor radii. Multirotor vehicles at the same rotational speeds have weaker amplitude modulations than a single rotor, which demonstrates the benefits of using multiple rotors in terms of noise annoyance. Finally, noise contours from a vertiport design show an increase in the broadband noise level when multiple VTOL vehicles are operated simultaneously.

scholarly journals СУЧАСНИЙ СТАН ПРОБЛЕМИ РОЗРОБКИ ЗВУКОПОГЛИНАЮЧИХ КОНСТРУКЦІЙ ДЛЯ ГАЗОТУРБІННИХ ДВИГУНІВ

2020 ◽  
pp. 111-120
Author(s):  
Євген Олександрович Римаренко
Keyword(s):  
Noise Level ◽  
Low Frequency ◽  
Aircraft Noise ◽  
Acoustic Properties ◽  
Noise Levels ◽  
Fan Noise ◽  
Turbofan Engines ◽  
Acoustic Liners ◽  
Noise Margin ◽  
Fiber Materials

A review of current international aviation noise requirements is provided. It is shown that international requirements for aircraft noise levels are constantly increasing. The rapid growth of the international fleet leads to an increase in the number of take-offs and landings of aircraft at airports, and as a result, the problem of aircraft noise still relevant. To reduce noise levels at airports, various methods are used, one of which is the operational limitations of aircraft concerning the levels of noise they create. In European Union countries there are operational restrictions for aircraft meeting the requirements of Chapter 3 with a noise margin of less than 10 EPNdB. For already established aircraft that have passed certification, again it is necessary to look for methods to reduce noise. The main type of aircraft in operation in the world is an aircraft with turbofan engines. For such an aircraft, the main sources of noise during take-off will be the noise of the fan and jet, while landing, the noise of the landing gear, flaps, slats, and fan noise. When choosing a method of reducing aircraft noise, it should determine the source that most affects the overall noise level. It has been determined that fan noise is one of the main sources of noise. Acoustic liners constructions are widely used to reduce the noise level created by the fan. They are one of the most priority areas for reducing fan noise. Achievements in the use of acoustic liners to decrease the noise of domestic aircraft An-124-100, An-148-100 are considered. It is noted that due to the increasing requirements for aircraft noise, it is necessary to use new acoustic liners with improved sound-absorbing properties. It was determined that it is possible to improve the sound-absorbing properties of the acoustic liners by expanding the frequency range of sound absorption of such structures.Modern methods for improving the acoustic properties of the acoustic liners are presented: the use of multilayer resonant acoustic liners makes it possible to customize the design for an increased number of calculation parameters; the use of modified variants of the acoustic liners core such as corrugated core, oversized perforated core; the use of porous and porous fiber materials in the design of the acoustic liners to provide additional sound-absorbing ability, the use of low-frequency acoustic liners to reduce the noise of promising turbofan engines with a high and ultra-high bypass ratio.

scholarly journals Aircraft Noise of Airport Community in Korea

2020 ◽  
Vol 16 (1) ◽  
pp. 1-10
Author(s):  
Soo Hee Oh ◽  
Kyoungwon Lee
Keyword(s):  
Quality Of Life ◽  
Information System ◽  
Noise Reduction ◽  
Noise Level ◽  
Careful Consideration ◽  
Aircraft Noise ◽  
Noise Levels ◽  
The Past ◽  
Over Time

Aircraft noise is one of the serious environmental noises with the increased use of flight traffic. The purpose of this study is to understand aircraft noise levels of airport communities in Korea using baseline data for audiologic management. Aircraft noise levels were retrieved from the National Noise Information System every month between 2004 and 2018. We reviewed aircraft noise levels obtained from total of 111 airport communities across 14 airports. In order to understand aircraft noise levels of civil and military airports, the aircraft noise levels measured in civil and military airport communities compared with the noise levels from civil airport communities. The data showed average 71-73 weight equivalent continuous perceived noise level (WECPNL) for fifteen years across airport cities and the average noise levels did not increase over time between 2004 and 2018 years. The civil and military airports showed about 12 WECPNLs of increased noise levels compared to the civil airports. The most civil and military airport communities, including Gwangju, Gunsan, Daegu, Wonju, and Cheongju generated the maximum noise levels and ranked as the highest airport for aircraft noise levels. Although aircraft noise levels in airport communities were similar over the past decade, civil and military airports generated increased noised levels compared to civil airports due to jet plane noises and other military-related noises. Careful consideration is necessary to implement noise reduction policy for civil and military airport communities. Ongoing noise control, hearing monitoring, education, and relevant policies are required to improve the quality of life in the airport community residences.

scholarly journals Analisis Paparan Kebisingan Pesawat Terbang di Bandara Babullah Ternate

2018 ◽  
Vol 1 (2) ◽  
pp. 39
Author(s):  
Karman Zein ◽  
Safrudin Sagaf
Keyword(s):  
Wind Speed ◽  
Data Collection ◽  
Preliminary Data ◽  
Noise Level ◽  
Noise Exposure ◽  
Environmental Parameters ◽  
Aircraft Noise ◽  
Air Humidity ◽  
Noise Levels ◽  
Research Show

This study aims to measure exposure to aircraft noise levels in the Babullah Airport area of Ternate. Data collection in this study is observation (observation), which aims to obtain preliminary data relating to the problems studied, besides that data collection also uses noise level measurements carried out at the 0 meter point from the runway to 500 meters at 5 points. The results of the research show that the activities of airplanes at Babullah Ternate Airport began to experience an increase, as indicated by the type of airlines that competed in serving flights at national and domestic levels.Domestic and national flight activities, airplanes at Babullah Ternate Airport greatly affect the environment. The results of this study indicate that the kebanganangan level in the airport area reaches an average of 78.8 db (A) with other environmental parameters such as wind speed and air humidity 12.6 m / s and 81.23%. If the size of the environmental parameters no longer affect noise exposure, the area has noise that exceeds the threshold. To reduce the noise level due to the flight activities at Babullah Ternate Airport, a barrier is needed as well as socializing the danger of noise for humans.

Advanced Acoustic Nacelle Concepts

1976 ◽  
Author(s):  
G. W. Painter
Keyword(s):  
Noise Reduction ◽  
Jet Noise ◽  
Aircraft Noise ◽  
Noise Levels ◽  
Airframe Noise ◽  
Jet Mixing

The results of a recently completed study on the potential noise-reduction benefits that could be derived from the development of an “Advanced Acoustic-Composite Nacelle” for future subsonic commercial transports are discussed. In this study, noise-reduction objectives were based on the acceptance of noise floors imposed by airframe noise during approach operation and jet noise during takeoff. The reduction of treatable source levels to these floors should result in aircraft noise levels below those of the already quiet current widebodied transports. It is predicted that the foregoing noise levels can be achieved in future widebodied transports by employing advanced acoustical duct liners, extending the (lined) fan duct, and incorporating jet mixing.

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