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Browsing Other publications by Author "Aalmoes, R."
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    Engaging Communities in the Hard Quest for Consensus
    (Springer, 2022) Heyes, G. ; Hauptvogel, D. ; Benz, S. ; Schreckenberg, D. ; Hooper, P. ; Aalmoes, R.
    Mistrust, negative attitudes and the expectation of not having any voice against airport authorities can considerably impact on the perception of aircraft noise exposure, lead to increased annoyance and can even influence sleep quality of the noise affected residents. As a result, quality of life can reasonably be assumed to be reduced. This chapter focuses on measures to engage airport communities in aviation-related decision making by improving the information and communication of airports in order to enhance residents’ ‘competence’ and also trust in the airport noise authorities. The role of non-acoustical factors, including aviation-related media coverage in this process, is discussed and results from a media coverage analysis conducted in the ANIMA project are presented. Based on research on perceived fairness in communication, recommendations are given as to how to communicate and engage residents with the aim of building a neighbourly relationship between airport authorities and residents on an even footing and, thus, enable an improved exchange leading to deeper understanding and comprehension by both parties. Results from the ANIMA review on airport management strategies (including communication and engagement aspects) of several European airports are presented and conclusions are drawn about what characterises good (or bad) communication and community engagement strategies for the purpose of a neighbourly relationship between the airport and its residents.
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    Human response to characteristic sound of drones
    (University of Salford, 2024) Aalmoes, R. ; Sieben, N.R.
    New aircraft mobility concepts feature the operation of drones close to locations where humans reside. Main applications currently include photography and video recording and hobbyists operating drones, but observation, inspection and package delivery are expected to become important future applications using drones. Residents close to operations of drones, will therefore be impacted by the increase of the sound events of these vehicles, either by larger drones and thus higher sound levels, or by the increased number of movements, or by both. Since the characteristics of drone sounds are different from other air vehicles, such as helicopters or airplanes, annoyance response is also expected to be different, even at similar loudness levels, as seen in recent studies where drones were considered more annoying than helicopters. Human perception studies with simulations of single event flyover sounds of drones and other vehicles provide insight into a human’s reaction to these vehicles. A new perception study using both visual and auditory stimuli has been performed with similar peak sound levels for flyover events of different vehicles. The results of this study show that both aircraft and drones are rated louder in rural environments than in urban environments. Also, aircraft flyovers are considered more annoying than drone flyovers. No significant difference has been found between drones and helicopter flyovers. But with same peak sound level, drones are perceived significantly louder than Pipistrel Electro aircraft. Some of these results differ from earlier findings, possibly because of other sound characteristics, operational procedures, or different background environments.
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    Sleep quality in Noisy Aircraft Cabins
    (Comfort Congress, 2023) Sieben, N.R. ; Maij, A. ; Zon, G.D.R. ; Aalmoes, R. ; Marsman, L.A. ; Drongelen, A. van
    This exploratory study has investigated the effects of cabin noise on passenger sleep length and quality, because the influence of cabin comfort and particularly cabin noise levels on sleep length and quality is not yet fully understood. Therefore, a feasibility study was conducted to explore the possibilities for a more extensive laboratory sleep study that will be executed later. In this feasibility study two groups of four ‘passengers’ slept under different circumstances. To simulate an immersive experience, these ‘passengers’ were seated on real aircraft chairs and slept in a semi-noise-controlled environment. Each group faced different variances of cabin noise loudness. The effects of these different conditions on sleep length, quality and comfort levels were measured and compared with each other, and with a control condition where subjects slept in their own bed at home. Demographic factors and general sleep quality were gathered to account for individual differences. The results show that sleeping in the own bed at home is related to better sleep quality and less subsequent fatigue. However, no significant results on sleep and fatigue were found between the different noise conditions
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    Sound Perception Study of Auralized Novel Propeller Design for Future Electrical Air Mobility Platforms
    (AIAA, 2024) Aalmoes, R. ; Knepper, K.M. ; Sieben, N.R. ; Haan, W. de ; Margalida, G. ; Sinnige, T.
    To reduce climate impact of aviation, it is imperative to consider to introduce aircraft based on electrical engines. These electrical aircraft replace jet engines by propeller-driven propulsion systems, making the propeller the dominant noise source. A quieter and more efficient propeller blade design may generate a different noise signature, justifying a perception study to assess overall noise impact. In this study, a novel designed propeller “S2PROP” is compared with a baseline propeller “XPROP”. Both blades were measured in an aeroacoustic wind-tunnel, and wind-tunnel measurements of tonal and broadband noise were used as an input to generate fly-over sound samples of an aircraft equipped with these propellers. Atmospheric absorption, the secondary ground reflection path and Doppler effect were considered in creating a synthesized flyover sound. A noise simulator with virtual reality glasses and headphones was used to simulate both a visual and audible flyover procedure for participants of the perception study. Although a noise reduction is attained at the highest sound level around 600Hz for the S2PROP, it also generates higher broadband sounds at higher frequencies, resulting in finding no significant differences in perceived loudness or annoyance in the study between the two propeller designs.
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    Towards Innovative Ways to Assess Annoyance
    (Springer, 2022) Lavandier, C. ; Aalmoes, R. ; Dedieu, R. ; Marki, F. ; Grossarth, S. ; Schreckenberg, D. ; Gharbi, A. ; Kotzinos, D.
    Technological changes have driven the developments in the field of noise annoyance research. It helped to increase knowledge on the topic substantially. It also provides opportunities to conduct novel research. The introduction of the internet, the mobile phone, and miniaturisation and improved sensor technology are at the core of the three research examples presented in this chapter. The first example is the use of a Virtual Reality simulation to evaluate aircraft flyovers in different environments, and it examines how visual perception influences noise annoyance. The second example describes the use of a mobile application applying an Experience Sampling Method to assess noise annoyance for a group of people living near an airport. The third and final example is a study over social media discussions in relation to noise annoyance and quality of life around airports. These three examples demonstrate how novel technologies help to collect and analyse data from people who live around airports, and so improve our understanding of the effect of noise on humans.