Psychoacoustic modelling of rotor noise

Torija, Antonio J.; Li, Zhengguang; Paruchuri, Chaitanya C.

doi:10.1121/10.0009801

Cited by 19 publications

(5 citation statements)

References 22 publications

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“…With respect to the psychoacoustic performance, we performed a comprehensive analysis of the improved Zwicker's psychoacoustic metrics. While several previous studies [24,26,43] pointed out that the human response to drone noise highly depends on the dominant factor of loudness metrics, in this study, it is verified that the loop-type propellers can markedly reduce the mid-range-frequency tonal noise at the cost of broadband noise in high-frequency range, which is beneficial for the loudness of low weighting in the high-frequency range. Gwak et al [24] also reported that the fluctuation strength and the sharpness are a notable feature observed in the annoyance of UAV noise.…”

Section: Discussionsupporting

confidence: 68%

“…In terms of psychoacoustics, Merino-Martinez et al ( 2021) [21] presented a psychoacoustic metrics-based approach to evaluate the wind turbine acoustic performance of noise suppression measures, and pointed out the importance of the noise characteristics for the perceived annoyance, including the tonality, spectral content, and amplitude modulation. In fact, a series of studies have shown that the noise generated by rotorcrafts can cause human beings to be more annoyed than the traffic noises induced by other transportation sources because of the very specific noise characteristics of the drone propellers [9,[22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…Schäffer et al [27] gave a systematic review on both the noise emission and its impact on human beings. Torija et al [26,28] investigated the aerodynamic interaction effects on the noise production by UAVs with contrarotating propellers by means of psychoacoustic analysis and further developed an optimized psychoacoustic annoyance model for the rotor-induced noises based on the subjective listening experiment. Furthermore, Torija et al [8] gave an extensive discussion on the potential and feasibility to develop a psychoacoustics-informed system to greatly constrain the harmful impact of UAV noises on human communities.…”

Section: Introductionmentioning

confidence: 99%

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Integrated Evaluation of the Aeroacoustics and Psychoacoustics of a Single Propeller

Sun

Yonezawa

Shima

et al. 2023

IJERPH

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Aeroacoustic noise in multiple rotor drones has been increasingly recognized as a crucial issue, while noise reduction is normally associated with a trade-off between aerodynamic performance and sound suppression as well as sound quality improvement. Here, we propose an integrated methodology to evaluate both aeroacoustics and psychoacoustics of a single propeller. For a loop-type propeller, an experimental investigation was conducted in association with its aerodynamic and acoustic characteristics via a hover stand test in an anechoic chamber; the psychoacoustic performance was then examined with psychoacoustic annoyance models to evaluate five psychoacoustic metrics comprising loudness, fluctuation strength, roughness, sharpness, and tonality. A comparison of the figure of merit (FM), the overall sound pressure level (OASPL) and psychoacoustic metrics was undertaken among a two-blade propeller, a four-blade propeller, the loop-type propeller, a wide chord loop-type propeller, and a DJI Phantom III propeller, indicating that the loop-type propeller enables a remarkable reduction in OASPL and a noticeable improvement in sound quality while achieving comparable aerodynamic performance. Furthermore, the psychoacoustic analysis demonstrates that the loop-type propeller can improve the psychological response to various noises in terms of the higher-level broadband and lower-level tonal noise components. It is thus verified that the integrated evaluation methodology of aeroacoustics and psychoacoustics can be a useful tool in the design of low-noise propellers in association with multirotor drones.

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Section: Discussionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Integrated Evaluation of the Aeroacoustics and Psychoacoustics of a Single Propeller

Sun

Yonezawa

Shima

et al. 2023

IJERPH

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“…The wide variety of helicopter noise is pointed out as one of the main difficulties in the psycho-acoustics studies. Nevertheless, recently several studies improved the understanding of the perception of helicopter noise [2][3][4][5][6]. Thanks to the analysis of listening tests' results, they investigated the source of annoyance and linked it to the sound characteristics.…”

Section: Introductionmentioning

confidence: 99%

Investigation of helicopter noise annoyance and noticeability in urban environment

Ruaud,

Legriffon,

Caillet

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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Helicopters are often operated in urban areas, potentially leading to an additional source of annoyance for the inhabitants. In an already complex urban noise environment, masking effects can influence this negative perception. To deepen the understanding of helicopter noise annoyance, it is interesting to include background noise and the concept of noticeability when evaluating the impact of helicopter noise. Two listening tests have been carried out to study the annoyance caused by helicopter noise, the noticeability of these sounds in certain noise environments and the link between these two phenomena. Auralized helicopter sounds were played over a background noise while participants were reading novels. For each stimulus, participants graded on a numerical scale the annoyance and/or the interference on their reading activity caused by the flyover. The statistical analysis enables to 1) examine the link between flyover characteristics and annoyance as well as the link between flyover characteristics and noticeability, 2) establish a correlation with acoustic and psychoacoustic parameters such as A-weighted sound pressure level, loudness, sharpness, detectability level and roughness, 3) study the correlation between the noticeability of helicopter noise and annoyance.

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“…In industrial applications such as automotive, aviation, rail or consumer goods, tonality expresses the relative weight of the tonal components over their ambient frequency content. Tonality in rotary machines has become a research topic in terms of the psychoacoustic impact on humans in different fields, ranging from the aviation industry [25] to household equipment, such as vacuum cleaners [26].…”

Section: Introductionmentioning

confidence: 99%

Identification of Aerodynamic Tonal Noise Sources of a Centrifugal Compressor of a Turbocharger for Large Stationary Engines

Vacula

Novotný

2023

Applied Sciences

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The aerodynamics of centrifugal compressors is a topical issue, as the vibrations and noise reduce the comfort of people who are in proximity to the compressor. The current trend in rotating machinery research is therefore not only concerned with performance parameters but also increasingly with the effect on humans. An analysis of aerodynamic noise based on external acoustic field measurements may be a way to assess the nature of aerodynamic excitation. In this research, the experimental measurements at 20 operating points covered the entire characteristic operating range of the selected centrifugal compressor. The dominant noise arising at blade-passing frequency (BPF) was identified at all the operational points, and the dominant effect of the buzz-saw noise was identified at the maximum rotor speed. The determination of the total sound pressure level LPA showed a trend towards an increasingly higher rotor speed and compressor surge line. In the amplitude-frequency characteristics, the sound pressure was found to be dependent on the rotor speed for BPF. On the other hand, non-monotonicity was detected between the operational points at given speed lines, confirming the complexity of the aerodynamics of rotating machines. The metric chosen to identify prominent tones determined by the tonality of individual tones in the frequency spectrum showed a clear effect of integer multiples of the rotational frequency on the overall noise. Thus, the results presented here confirm the dominant influence of BPF in terms of the psychoacoustic impact on humans.

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Psychoacoustic modelling of rotor noise

Cited by 19 publications

References 22 publications

Integrated Evaluation of the Aeroacoustics and Psychoacoustics of a Single Propeller

Integrated Evaluation of the Aeroacoustics and Psychoacoustics of a Single Propeller

Investigation of helicopter noise annoyance and noticeability in urban environment

Identification of Aerodynamic Tonal Noise Sources of a Centrifugal Compressor of a Turbocharger for Large Stationary Engines

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