Being in Control of Noise Levels Improves the Perception of Airplane Seat Comfort

2021 ◽  
Author(s):  
Joyce Bouwens ◽  
Luisa Fasulo ◽  
Suzanne Hiemstra-van Mastrigt ◽  
Udo W. Schultheis ◽  
Alessandro Naddeo ◽  
...  
Keyword(s):  
Aircraft Engine ◽  
Aviation Industry ◽  
Noisy Environment ◽  
Noise Levels ◽  
Engine Noise ◽  
Acoustic Environment ◽  
Physical Discomfort ◽  
Seat Comfort ◽  
Comfort Perception ◽  
Cabin Interior

Abstract. The aviation industry is constantly making compromises when designing comfortable airplane cabins. Providing passengers with a pleasant acoustic environment without adding weight to the cabin structure is a field of tension that challenges cabin interior designers. The aim of this study was to investigate whether noise levels affect the comfort and physical discomfort experienced by airplane passengers, and whether control influences comfort perception. To this end, 30 participants experienced three conditions (silence, aircraft engine noise at 75 dB, and the same noise with the ability to use earplugs), and comfort and discomfort were measured using a questionnaire. It was concluded that aircraft engine noise negatively affected the airplane passengers’ comfort experiences. Having the ability to control this noisy environment with earplugs resulted in the lowest reported physical discomfort.

Photoacoustic Leak Testing

2000 ◽  
Author(s):  
Serdar H. Yönak ◽  
David R. Dowling
Keyword(s):  
Carbon Dioxide Laser ◽  
Control Process ◽  
Noise Levels ◽  
Tracer Gas ◽  
Acoustic Environment ◽  
Matched Field Processing ◽  
Gas Leak ◽  
Quality Control Process ◽  
Leak Testing ◽  
Detection And Localization

Abstract Leak testing is a critical manufacturing quality control process. Unintended leaks in pressurized or evacuated containers may be detrimental to consumers, manufacturers, and/or the environment. This paper describes a leak detection and localization technique based on photoacoustic sounds produced by scanning a carbon dioxide laser over leaks emitting a photoactive tracer gas, sulfur hexaflouride. Photoacoustic signals are recorded in a bandwidth from 3 up to 110 kHz by multiple microphones. From these recorded signals, the presence or absence of a leak may be deduced by comparison with background noise levels. When a leak is present, its location is determined from a simple model of the acoustic environment and matched field processing (MFP). Current results show that a gas leak of 1 cm3 per day can be detected and localized to within ±1 mm in a few seconds using four microphones placed 0.41 m from the leak location and an incoherent average of the MFP ambiguity surfaces at twelve signal frequencies.

scholarly journals The Design of Technological Instructions for an Assembling the Aircraft Engine

2016 ◽  
Vol 4 (18) ◽  
pp. 14
Author(s):  
Martin Novák ◽  
Petr Daňko ◽  
Martin Lukavský
Keyword(s):  
Aircraft Engine ◽  
Aviation Industry

This article is about a design of new technological instructions for an aviation industry. The goal of the new technological instructions is to replace the old ones. The old instructions are less clear and less suitable for new workers. A change and an upgrade of the new instructions is shown on the technological instructions for disassembling of free turbine´s blades during general overhaul. The free turbine is from the M601 engine. The new instructions should be more efficient and enhanced general overhaul.

scholarly journals Methodical foundations of the preventing monitoring of aviation industry economic agents

2020 ◽  
pp. 9-14
Author(s):  
Iryna NIENNO ◽  
Yurii HRINCHENKO
Keyword(s):  
Sustainable Development ◽  
Customer Value ◽  
Rating Scale ◽  
Aviation Industry ◽  
Logical Scheme ◽  
The Sustainable Development ◽  
Economic Agents ◽  
Aircraft Manufacturing ◽  
Seat Comfort ◽  
Technological Modernization

The article formulates the methodical grounds for preventive monitoring of service and production components of economic agents of aviation industry. The structural-logical scheme for monitoring by quantitative parameters and by consumers’ feedback was proposed. The preventive monitoring is a valuable tool to recognize the interaction between government and industry’s goals considering sustainable development. The goal of the article is to develop methodological grounds for preventive testing of economic agents of the aviation industry, which will include assessment parameters, assessment scale, role instructions and transparency of results. The preventive tasting of airport operations is based on travelers’ experience on: queuing, airport shopping, terminal cleanliness, terminal seating, food beverages, Wi-Fi connectivity, terminal signs, airport staff, sentiment. The preventive testing for airline experience includes: value for money, cabin staff, seat comfort, food comfort, inflight entertainment, ground service, Wi-Fi connectivity, sentiment. The preventive testing for aircraft onboard experience assesses: legroom, seat recline, seat width, aisle space, viewing TV, power supply, seat storage, sentiment. The preventive testing for aircraft manufacturing and maintenance analyses: design, full-cycle manufacturing, warrantee, post-warrantee repair, consolidated designing, manufacturing and maintenance process, leasing, technological modernization, licensing. The article provides the comprehensive system for a preventive monitoring based on customer value, which fixes the key parameters for improvements of the operation of the economic agents of the industry. The conclusion of the research reasons the application of quality assessment based on consumer value created by industry’s agents for a preventive monitoring along financial evaluation and bankruptcy probability for the assessment of the sustainable development of the industry. The perspective of the further research may focus on formulating signaling system for government instruments and on detailing the rating scale for the industry’s agents, based on benchmarking practice.

Effects of the reduction of aircraft noise emission due to the travel restriction during the COVID-19 pandemic at residential areas around Tan Son Nhat Airport

2021 ◽  
Vol 263 (1) ◽  
pp. 5114-5124
Author(s):  
Thulan Nguyen ◽  
Tran Thi Hong Nhung Nguyen ◽  
Bach Lien Trieu ◽  
Makoto Morinaga ◽  
Yasuhiro Hiraguri ◽  
...  
Keyword(s):  
Aircraft Noise ◽  
Residential Areas ◽  
Noise Levels ◽  
Noise Emission ◽  
Acoustic Environment ◽  
Comparison Results ◽  
Travel Restrictions ◽  
Before And After ◽  
The Impact ◽  
Travel Restriction

The travel restrictions caused by the epidemic outbreak in early 2020 worldwide have caused many changes in all aspects of life, especially in the acoustic environment. This study examines the impact of this environmental change at Tan Son Nhat International Airport (TSN), the largest airport in Vietnam, by comparing the situations before and after the airport stopped operating all international flights in March 2020. The after-the-change survey was conducted in 2 phases, June and September 2020, three months and six months after the stop decision. The number of flights observed in August 2019 was 728; this number is 413 and 299 for the two surveys in 2020. The range of noise levels estimated for 12 sites around TSN decreased from 63-81 dB in 2019 to 32-67 dB in June 2020 and 33-69 dB in September 2020. At the same aircraft noise level, the percentage of highly annoyed (% HA) and the percentage of insomnia (%ISM) in the 2020 survey are higher than those in the 2019 survey. The comparison results of reaction to noise before and after the TSN's noise change indicated an increase in negative responses to noise might happen in the increased noise and reduced noise situation.

Design and assessment of a distributed active acoustic liner concept for application to aircraft engine noise reduction

2017 ◽  
Vol 141 (5) ◽  
pp. 3643-3643
Author(s):  
Herve Lissek ◽  
Romain Boulandet ◽  
Sami Karkar ◽  
Gaël Matten ◽  
Manuel Collet ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Aircraft Engine ◽  
Engine Noise ◽  
Acoustic Liner

scholarly journals COMPARISON OF NURSING HOME STAFF’S PERCEPTIONS OF NOISE TO MEASURED NOISE LEVELS

2019 ◽  
Vol 3 (Supplement_1) ◽  
pp. S277-S277
Author(s):  
April Ames ◽  
Stacie Dubin ◽  
Michael Valigosky ◽  
Victoria Steiner
Keyword(s):  
Nursing Home ◽  
Complex Analysis ◽  
Quality Care ◽  
Nursing Facilities ◽  
Noisy Environment ◽  
Healthcare Staff ◽  
Noise Levels ◽  
Noise Sources ◽  
Provide Quality Care ◽  
Nursing Home Facilities

Abstract A noisy environment may affect the ability of healthcare staff in nursing facilities to effectively complete tasks and provide quality care to residents. Staff may also become irritable or annoyed due to their perception that noise levels are too loud. The purpose of this descriptive study was to examine the differences in nursing home staff’s perceptions of noise levels compared to measured noise levels in four nursing home facilities in Ohio. A questionnaire was also distributed to examine the perceptions of noise levels by staff and the effects of noise on their health. The majority of the respondents (n=90) were white females. They described all facilities as being moderately noisy which was consistent with the measured noise levels. The loudest perceived noise sources included door/patients alarms and floor cleaners, which was confirmed by measured noise levels. The majority of facilities identified the nurses station as one of the noisiest locations; however, this was inconsistent with measured noise levels. Overall, respondents at all facilities felt neutral or disagreed that the noise levels impacted themselves or the residents. However, some respondents agreed that in a noisy environment it is easier to make job errors, difficult to concentrate on work, and they find themselves irritable or agitated. Perceptions of noise should be considered along with measured noise levels because tolerance levels differ among individuals and mental activities involving memory or complex analysis are sensitive to noise which may affect job performance.

scholarly journals Experimentally increased noise levels change spatial and singing behaviour

2013 ◽  
Vol 9 (1) ◽  
pp. 20120771 ◽  
Author(s):  
Kirsty Elizabeth McLaughlin ◽  
Hansjoerg P. Kunc
Keyword(s):  
Noise Source ◽  
Noise Pollution ◽  
Erithacus Rubecula ◽  
Noise Levels ◽  
Acoustic Environment ◽  
Animal Populations ◽  
Suitable Habitats ◽  
Free Ranging ◽  
The Impact ◽  
New Infrastructure

The reasons why animal populations decline in response to anthropogenic noise are still poorly understood. To understand how populations are affected by noise, we must understand how individuals are affected by noise. By modifying the acoustic environment experimentally, we studied the potential relationship between noise levels and both spatial and singing behaviour in the European robin ( Erithacus rubecula ). We found that with increasing noise levels, males were more likely to move away from the noise source and changed their singing behaviour. Our results provide the first experimental evidence in a free ranging species, that not merely the presence of noise causes changes in behaviour and distribution, but that the level of noise pollution plays a crucial role as well. Our results have important implications for estimating the impact of infrastructure which differs in the level of noise produced. Thus, governmental planning bodies should not only consider the physical effect on the landscape when assessing the impact of new infrastructure, but also the noise levels emitted, which may reduce the loss of suitable habitats available for animals.

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