Identify Ways to Reduce Noise Pollution in Aircraft Hangars
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The noise pollution produced by various aircraft systems, including hydraulic, pneumatic, electrical systems and auxiliary aircraft equipment inside the aircraft hangars, generally cause hearing impairment and mental disorder of shift and office personnel. Identifying hangar noise pollutants can lead to find solutions and methods to deal with the contaminants in the aviation industry. In the first phase of the research, the sound study in each specified region of the hangar, the required measurements and frequency analysis are done to determine the type of sound control appropriate for the hangar. Measurements in this study were conducted in accordance with standards, and the results of the measurements and equilibrium calculations after recording were compared with the permissible exposure limits in accordance with the Occupational Exposure Limit values. The results show that the highest sound pressure level corresponds to sheet metal activities (128 dBC) and thereafter respectively, pneumatic systems (112 dBC), hydraulic pumps (104 dBC) and electrical systems (86 dBA), and found that noise pollution of the hangar during the specified time for shift and office personnel is higher than the permissible limits, and this exposure is harmful to the physical and mental health of the staff. In the second phase of the research, by the results of statistical analysis of the questionnaires, there was a significant relationship between the result of estimating noise intensity and the extent of its annoyance by shift and office personnel, which most people in the hangar believe that this level of noise pollution is very annoying.Keywords:
Annoyance
Aircraft noise
dBc
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Abstract : This report is one of a series describing the research program undertaken by the Aerospace Medical Research Laboratory to develop procedures for predicting the community noise exposure resulting from aircraft operations. It reviews current methods for predicting noise exposure around an airport, the results of various social surveys around airports, and psychoacoustic studies of aircraft noise signals, as well as effects of aircraft performance, flight path dispersion, non-standard weather effects, and other factors affecting the accuracy and variability in predicting aircraft noise exposure on the ground. These reviews and analyses are used to recommend a revised procedure for predicting noise around air bases.
Aircraft noise
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The method involved the selection of three airports which were dominated by aircraft weighing 12,500 lbs or under and which were also undergoing a change relative to utilization. Also, there was interest in airports with different utilization levels so that effect of number of operations could be considered. In addition, there was a requirement to select airports with communities in the surrounding areas which were exposed to aircraft operations noise. Noise annoyance response data was obtained from available sources. These sources included environmental impact statements, interviews with airport managers, noise complaint information, community meetings concerned with projected changes in airport utilization, and social survey data. As a means of objectively assessing the noise impact due to aircraft operations, noise measurement and computer noise modeling determinations were obtained for each airport. Listening quality tape recordings were also obtained.
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Purpose In recent years, in parallel with the increasing air traffic and the number of passengers in air transport, the number of people exposed to aircraft-induced noise has increased significantly. Especially people living in the areas close to the airports are affected by noise emission during the landing, take-off, taxi and ground operations. Negative effects of noise such as sleep disturbance, lack of concentration, anxiety and high blood pressure cardiac diseases were determined directly or indirectly for human health. For this reason, examining the noise effect caused by aircraft and determining the necessary measures to be taken is very important for the sustainable development of aviation. In the International Eskisehir Hasan Polatkan Airport (LTBY), this paper aims to calculate a noise mapping following international standards in line with the directives of the International Civil Aviation Organization (ICAO). Also, Annex 8, “Airworthiness of Aircrafts” and Annex 16, “Environmental Protection Volume 1 Aircraft Noise”, which were taken at the International Civil Aviation Convention, were proposed to determine the exposure caused by aircraft noise. Design/methodology/approach In this paper, noise levels for the day (07.00–19.00), evening (19.00–23.00) and night (23.00–07.00) period around LTBY were predicted and calculated by the use of the IMMI software according to the “ECAC Doc. 29-Interim” method for the prediction and computation of the aircraft noise. Findings According to the calculated/mapped values, in the 24 hours (Lden), the noise level is 65 dB (A) and above. In the day time zone, the noise level is 63 dB (A) and above. When the calculations for the evening time zone are examined, the noise level is above 58 dB (A). When the calculations for the night time frame are examined, it is calculated that there is no dwelling that is affected by the noise level above 53 dB (A). Practical implications Along with future improvements, it is recommended to be applied to other civil airports. Originality/value To the best of the authors’ knowledge, there is no previous research in the literature on aircraft noise mapping of LTBY. Also, unlike the software commonly used in other works in the literature, IMMI software was used in this study. Such investigations should be carried out in other civil airports in the coming years to struggle with noise emissions and noise control. If noise boundary values are exceeded, action plans should be developed for a sustainable aviation concept. Along with future improvements, it is recommended to be applied to other civil airports.
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International airport
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Noise from high performance military fighter aircraft impacts the hearing and performance of personnel working near these aircraft and can be a source of annoyance to people living near airbases, airports 1 , and ranges where these aircraft are operated. Developers and operators of these aircraft must report the noise produced in communities as part of the NEPA (National Environmental Policy Act of 1974) process. Additionally, overexposure of personnel to high levels/durations of noise can result in permanent hearing loss, the number one veteran disability in the United States, and negatively impact voice communication capability. Additionally, the widely varying techniques used to acquire aircraft noise data make comparisons of aircraft noise and noise reduction technology performance more difficult.
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The focus of the investigation is centered around two main themes: an analysis of the effects of aircraft noise on the psychological and physiological equilibrium of airport residents; and an analysis of the sources of variability of sensitivity to noise. The methodology used is presented. Nine statistical tables are included, along with a set of conclusions.
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As quieter aircraft have begun to replace some of the noiser ones in the civil air transport fleet, aircraft noise exposure levels in certain airport neighborhoods have declined to some degree. Federal agencies with interests in aviation noise have not yet offered policy guidance for gauging the smallest decrease in aircraft noise that may be considered meaningful under these circumstances in airport neighborhoods. An empirical study of this issue was thus underken in residential areas near a large airport at which noise exposure levels had declined by several decibels over the last few years. Very few neighborhood residents either noticed a decrease in aircraft noise in the recent past or decribed themselves as less annoyed by aircraft noise than in prior years.
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Noise pollution caused by the presence of airfields adjacent to residential areas is studied. Noise effects on the sleep of residents near airports and the degree of the residents noise tolerance are evaluated. What aircraft noises are annoying and to what extent the annoyance varies with sound level are discussed.
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Noise is nothing more than air pollution caused by increased vibration in the air. Environmental noise is the noise in the environment generated by several simultaneous sources, with the exception of occupational noise, with emphasis on roadway noise, construction noise, railway noise and aircraft noise. Aircraft noise is the noise generated mainly by aircraft operation at airports. Aircraft noise exposure causes considerable damage to life quality, health and well-being of the population near airports. As with all forms of pollution, noise must also be managed through the application of methodologies for identifying sources and receivers, highlighting, among the existing ones, the measurement of environmental noise and acoustic mapping of the area. The objective of this work was to verify the existence of aircraft noise in the area directly affected by Bacacheri Airport, in Curitiba, through the measurement of acoustic parameters and acoustic mapping. For this purpose, the Bruel & Kjaer 2238 sound analyzer and the Soundplan 8.0 software were used to measure aircraft noise and acoustic mapping, respectively. The results indicate that there is intense to moderate aircraft noise in the area surrounding the airport, as well as quantify the population exposed by the noise pollution generated at the airport being affected by the negative impacts. It is concluded that there is need for the airport to provide noise mitigation measures recommended by the International Civil Aviation Organization (ICAO).
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General Social Survey
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Increasing mechanisation and population densities in our society, coupled with higher standards of living and education, have in recent years resulted in a growing concern about pollution and its effects on the environment. The era of sporadic individual complaints to government is being rapidly superseded by one where strategic concerted action by irate citizens’ interest groups is becoming commonplace. As a result, governments are becoming increasingly involved with the problem of environmental pollution; in Canada, for example, the Environmental Protection Service of the Department of Fisheries and the Environment for fiscal year 1976–77 had a staff of approximately 800 and a total budget of $22 million.
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