R. Merino Martinez
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89 records found
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This study examines the role of turbulence distortion in predicting inflow turbulence (IT) noise generation from large wind turbines via Amiet's theory. Two subsequent distortion mechanisms are investigated: (i) the streamtube expansion in the rotor induction zone and (ii) the in
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Most aircraft noise research is solely based on audio recordings. Nevertheless, the use of virtual reality (VR) environments provides a more immersive experience and, hence, a higher level of realism when conducting psychoacoustic listening experiments in laboratory conditions. M
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Psychoacoustic listening experiments were conducted to investigate the human response to propeller noise under turbulent inflow conditions. The sound stimuli considered were recorded in aeroacoustic wind tunnel experiments featuring an isolated six-bladed propeller. The propeller
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The far-field acoustic emissions of a six-bladed propeller were investigated in aeroacoustic experiments in an openjet wind tunnel. The propeller was operating in different isotropic inflow turbulence conditions generated by turbulence grids placed upstream of the exit plane of t
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This study investigates the relationship between sound quality metrics (SQMs) and noise annoyance caused by airborne wind energy systems (AWESs). In a controlled listening experiment, 75 participants rated their annoyance on the International Commission on Biological Effects of N
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The far-field acoustic emissions of an isolated scale-model propeller ingesting turbulent inflow are experimentally investigated in wind-tunnel measurements. Phase-averaging and phase-shifting signal processing techniques are used to separate the deterministic (tonal) and random
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The increasing adoption of electric vehicles (EVs), which operate more quietly than internal combustion engine vehicles, raises concerns about their detectability, particularly for visually impaired road users. Regulations mandate exterior sound signals for EVs, ensuring minimum
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The growing adoption of electric vehicles, known for their quieter operation compared to internal combustion engine vehicles, raises concerns about their detectability, particularly for vulnerable road users. To address this, regulations mandate the inclusion of exterior sound si
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The influence of ambient noise in the perception of wind turbine noise is evaluated in this exploratory study. For this purpose, experimental field measurements of an NTK wind turbine at different wind speeds and background noise levels are considered. Synthetic wind turbine nois
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Aircraft noise annoyance is inherently subjective, and its accurate quantification represents a challenging task. There is a lack of consensus in the scientific community regarding which metrics are best for effectively representing this type of annoyance. The present study aims
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Novel propulsion concepts are being developed for urban air mobility (UAM). This study analyses the noise emissions of a virtual UAM vehicle equipped with 26 distributed, ducted, low-speed fans. Synthetic flyover sounds are generated using an auralization framework, which involve
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This study explores the potential of simulation methodologies in the early stages of the acoustic design of advanced air mobility cabins. With perceptual assessment as a priority, the approach includes conducting listening experiments based on the auralization of simulation resul
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Distributed propulsion systems are developed to power a new generation of aircraft. However, it is not known yet which noise emissions these propulsion systems produce, which psychoacoustic characteristics such systems exhibit, and how the generated noise is perceived. This paper
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The issue of acoustic reflections caused by an axisymmetric nozzle is addressed both numerically and experimentally. The contraction (with an exit diameter of 420 mm and a contraction ratio of 2) is representative of typical open-jet wind tunnel exits. Such a category of wind tun
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The application of an acoustically absorbent material (melamine foam) is investigated for the treatment of turbulence grids in an anechoic open-jet wind tunnel facility featuring an axisymmetric contraction. A comparative study of both the generated turbulence and the grids’ self
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The human perception of two wind turbines of different sizes, a small NTK turbine and a larger NREL model, was evaluated through their synthetically auralised sound. A wide range of wind speed conditions and observer locations was considered. The simulated sounds were analyzed us
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Experimental aeroacoustic measurements conducted in wind tunnels are crucial for informing the design process of various devices, including aircraft components or wind turbine blades. Whereas closed-section wind tunnels typically offer better aerodynamic conditions compared to th
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Authorities are starting to pay attention not only to the noise levels of Unmanned Aerial Vehicles (UAVs) but also to their quality for acceptance. This manuscript presents a study of four types of propeller-driven UAVs (single-propeller quadcopter, coaxial-propeller quadcopter,
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In recent years, the search for more sustainable propulsion systems for aviation has led to an increased interest in electric propulsion aircraft. These aircraft are often claimed to be more silent due to the lack of an internal combustion engine which eliminates the combustion a
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This preliminary study evaluates the expected psychoacoustics annoyance of an array of distributed propellers operating at different synchrophasing angles between the propeller blades. The study, conducted in a hybrid test section wind tunnel, focused on a three-propeller array i
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