Relevant bibliographies by topics / Stall noise

Academic literature on the topic 'Stall noise'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Stall noise"

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Zhang, Lei, Shoufang Liang, and Chenxing Hu. "Flow and Noise Characteristics of Centrifugal Fan under Different Stall Conditions." Mathematical Problems in Engineering 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/403541.

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An implicit, time-accurate 3D Reynolds-averaged Navier-Stokes (RANS) solver is used to simulate the rotating stall phenomenon in a centrifugal fan. The goal of the present work is to shed light on the flow field and particularly the aerodynamic noise at different stall conditions. Aerodynamic characteristics, frequency domain characteristics, and the contours of sound power level under two different stall conditions are discussed in this paper. The results show that, with the decrease of valve opening, the amplitude of full pressure and flow fluctuations tends to be larger and the stall frequency remains the same. The flow field analysis indicates that the area occupied by stall cells expands with the decrease of flow rate. The noise calculation based on the simulation underlines the role of vortex noise after the occurrence of rotating stall, showing that the high noise area rotates along with the stall cell in the circumferential direction.
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Čudina, M. "Noise generation in vane axial fans due to rotating stall and surge." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 215, no. 1 (January 1, 2001): 57–64. http://dx.doi.org/10.1243/0954406011520517.

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A characteristic of axial flow fans is instabilities in their performance and noise in partial load operation. These instabilities are a consequence of rotating stall created in the rotor blade and/or in the guide vane cascade. At some operating conditions the rotating stall caused the appearance of a surge representing the lowest region of fan operating stability. The rotating stall and especially surge caused a steep increase in the emitted noise and lowered the performance of the fan. The present paper highlights the rotating stall generation phenomenon and its influence on the emitted total noise level and noise spectra for axial flow fans with inlet and outlet guide vanes.
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Lacagnina, Giovanni, Paruchuri Chaitanya, Jung-Hoon Kim, Tim Berk, Phillip Joseph, Kwing-So Choi, Bharathram Ganapathisubramani, et al. "Leading edge serrations for the reduction of aerofoil self-noise at low angle of attack, pre-stall and post-stall conditions." International Journal of Aeroacoustics 20, no. 1-2 (February 1, 2021): 130–56. http://dx.doi.org/10.1177/1475472x20978379.

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This paper addresses the usefulness of leading edge serrations for reducing aerofoil self-noise over a wide range of angles of attack. Different serration geometries are studied over a range of Reynolds number [Formula: see text]. Design guidelines are proposed that permit noise reductions over most angles of attack. It is shown that serration geometries reduces the noise but adversely effect the aerodynamic performance suggesting that a trade-off should be sought between these two considerations. The self-noise performance of leading edge serrations has been shown to fall into three angle of attack (AoA) regimes: low angles where the flow is mostly attached, moderate angles where the flow is partially to fully separated, and high angles of attack where the flow is fully separated. Leading edge serrations have been demonstrated to be effective in reducing noise at low and high angles of attack but ineffective at moderate angles. The noise reduction mechanisms are explored in each of three angle regimes.
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Laratro, Alex, Maziar Arjomandi, Benjamin Cazzolato, and Richard Kelso. "Self-noise of NACA 0012 and NACA 0021 aerofoils at the onset of stall." International Journal of Aeroacoustics 16, no. 3 (April 2017): 181–95. http://dx.doi.org/10.1177/1475472x17709929.

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The aerodynamic noise of a NACA 0012 and NACA 0021 aerofoil is measured and compared in order to determine whether there are differences in their noise signatures with a focus on the onset of stall. Measurements of the self-noise of each aerofoil are measured in an open-jet Anechoic Wind Tunnel at Reynolds numbers of 64,000 and 96,000, at geometric angles of attack from −5° through 40° at a resolution of 1°. Further measurements are taken at Re = 96,000 at geometric angles of attack from −5 through 16° at a resolution of 0.5°. Results show that while the noise generated far into the stall regime is quite similar for both aerofoils the change in noise level at the onset of stall is significantly different between the two aerofoils with the NACA 0021 exhibiting a much sharper increase in noise levels below a chord-based Strouhal number of Stc = 1.1. This behaviour is consistent with the changes in lift of these aerofoils as well as the rate of collapse of the suction peak of a NACA 0012 aerofoil under these flow conditions.
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Xiao-Hong Qiu, Xiao-Hong Qiu, Jia-Li Chen Xiao-Hong Qiu, and Zi-Ying Ao Jia-Li Chen. "Stall Warning Algorithm of Axial Compressor Based on SSA-DBN." 電腦學刊 33, no. 3 (June 2022): 059–71. http://dx.doi.org/10.53106/199115992022063303005.

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<p>To solve the problem of stall warning for axial compressors, this paper proposes a stall warning algorithm based on the sparrow search algorithm, which optimizes the deep belief network. The deep belief network is trained by using deep learning to extract the FFT spectrum of compressor stall experiment data directly as the feature vector. To improve the accuracy of DBN classification, parameters of hidden layer nodes n and initial weights w of DBN were optimized by SSA algorithm, and stall warning algorithm model of SSA-DBN axial-flow compressor was established. The experimental results of the algorithms show that the stall data at each speed is at least 0.1～0.3s in advance for early warning. This method is 0.075~0.281s ahead of the various models from the past to the present, and noise is superimposed on the experimental data to verify the Robustness of the way, better surge warning margin performance, and engineering practicability. </p> <p>&nbsp;</p>
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Bianchi, Stefano, Alessandro Corsini, and Anthony G. Sheard. "Experiments on the Use of Signal Visualization Technique for In-Service Stall Detection in Industrial Fans." Advances in Acoustics and Vibration 2013 (May 7, 2013): 1–10. http://dx.doi.org/10.1155/2013/610407.

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The paper describes a stalldetection criterion based on the use of symmetrised dot pattern (SDP) visual waveform analysis and the stallwarning methodology based on a recently developed analysis. The experimental study explores the capability of the SDP technique to detect the stall incipience and evolution in the presence of low signal-to-noise ratios, that is, a noisy working environment. Moreover, the investigation presents a systematic analysis on the probe position’s influence with respect to the fan section. As such, the SDP technique in combination with an acoustic measurement is able to create a visual pattern that one can use to detect stall from potentially any location around the fan/duct system.
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Cudina, Mirko. "Noise generation by rotating stall and surge in vane-axial fans." Noise Control Engineering Journal 48, no. 3 (2000): 77. http://dx.doi.org/10.3397/1.2827969.

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Chun, Guo, Wang Mingnian, and Tang Zhaozhi. "A Study on Surge and Stall under the Interaction of Parallel Axial flow fan in Tunnel." Noise & Vibration Worldwide 42, no. 11 (December 2011): 9–14. http://dx.doi.org/10.1260/0957-4565.42.11.9.

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In the ventilation design for tunnels above 10km, an axial flow fan of great power needs to be set in ventilation shafts. There are few provisions on the setting modes and less discussion of parallel axial flow fan mode in the Specifications for Design of Ventilation and Lighting of Highway Tunnels. All of these bring a lot of difficulties about the axial fan selection, layout and control design. There is no specialized research on axial flow fan for tunnels and no studies on surge and stall under the interaction of parallel axial flow fan in tunnel in spite of the more and more application of parallel axial flow fan. So, this paper conducts a study on surge and stall under the interaction of parallel axial flow fan in tunnels. Through the study on the operating principle and analysis of parallel axial flow fan, we can know that the noise will increase suddenly, which will in turn result in fan vibration and running instability once the stall occurs. When a fan surges, the air volume and pressure, the motor current will fluctuate sharply, which brings significantly increased vibration and noise. At the same time, the rotary blade and the shell are subject to considerable stress effects and the fan will possibly suffer from great damage. The surge will occur in the unstable zone of axial fan performance curve. The strong pulsation and periodic oscillation of the air flow will increase the noise, which is a serious damage to the fan. So an axial fan should avoid this zone in running. With two axial flow fans of the same power parallel, the mutual influence is not very great. Therefore this research will focus on the efficiency in the case of two fans with a high and a low power parallel. Stall will occur if the outside pressure is greater than the outlet pressure. Once the stall happens, the noise will increase suddenly, which will in turn result in fan vibration and running instability. When two fans parallel, i.e. when the power ratio of the parallel fans is over 5.3, the possibility of the small fan's stall is high, otherwise it is small. With regard to the running efficiency of parallel axial flow fans and the starting safety, it is better to parallel two fans, and the fans with adjustable movable vanes or frequency control or the ordinary nonadjustable fans can be used.
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Okada, Ken. "Experiences with Flow-Induced Vibration and Low Frequency Noise Due to Rotating Stall of Centrifugal Fan." Journal of Low Frequency Noise, Vibration and Active Control 6, no. 2 (June 1987): 76–87. http://dx.doi.org/10.1177/026309238700600204.

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In recently constructed electric power plants, the forced draft fan (FDF), induced draft fan (IDF) and boost up fan (BUF) centrifugal fans and duct-systems have become larger in capacity and limited in space every year. As a centrifugal fan is enlarged, the diameter of the impeller is enlarged and its rotating speed is lowered. Therefore, there is an increasing tendency to generate a low frequency noise.5 In the case of an IDF or BUF, the rotating stall of the centrifugal fan frequently causes low frequency noise, since the inlet flow is often throttled during operation. If the hydrodynamic and acoustical characteristics are insufficient, a strong flow-induced vibration with low frequency noise is generated in the fan-duct system, and not only are problems caused in terms of structural strength, but also physical and physiological problems are induced due to low frequency noise.
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Bertagnolio, Franck, Helge Aa Madsen, Andreas Fischer, and Christian Bak. "A semi-empirical airfoil stall noise model based on surface pressure measurements." Journal of Sound and Vibration 387 (January 2017): 127–62. http://dx.doi.org/10.1016/j.jsv.2016.09.033.

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Dissertations / Theses on the topic "Stall noise"

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Navarro, García Roberto. "A numerical approach for predicting flow-induced acoustics at near-stall conditions in an automotive turbocharger compressor." Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/44114.

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Se realiza un modelo CFD-3D de un compresor centrífugo. Se determina la configuración numérica adecuada para simular puntos de funcionamiento cercanos a bombeo. Se validan los resultados frente a ensayos experimentales realizados en cámara anecoica. Se analizan los resultados, justificando las características del ruido emitido por el compresor a partir de los patrones de flujo encontrados. En particular, se analiza el flujo en la holgura entre los álabes y la carcasa del compresor y en la parte posterior del rodete. Por último, se analiza la influencia de las geometrías aguas arriba del compresor en el ruido producido por éste.
Navarro García, R. (2014). A numerical approach for predicting flow-induced acoustics at near-stall conditions in an automotive turbocharger compressor [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/44114
TESIS
Premiado
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Girish, Deeptha S. "Action Recognition in Still Images and Inference of Object Affordances." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1595500102337155.

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Pellegrin, Ricardo de. "OBJETOS MEDIADOS: PINTURAS MESTIÇAS." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/5213.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
The present research on Visual Poetics was developed between 2011 and 2013 as an investigation that was established by the combination of artistic practices and theoretical reflections, whose results reflect upon poetic strategies adopted by the conception and realization of those works. The proposal is based on contemporary issues that deal with the representation of objects in painting (still life) through the use of technical image, pictorial process that relates the concept of miscegenation. It was identified in those poetic strategies that the questions moved from the objects to the noise through mediated technique (optic) of the model. The confrontation between practice of studio and the data collected, visual and conceptual, intend to revitalize painting, permeating manual work with the perception from the mediated technique in order to demonstrate a view that makes connection with the issues from contemporaneity. Keywords: Painting, Mediation Technique, Still life, Optics, Noise
A presente pesquisa em Poéticas Visuais foi desenvolvida entre 2011 e 2013, como uma investigação que se estabeleceu na conjugação da prática artística a uma reflexão teórica, cujo resultado aborda as estratégias poéticas adotadas na concepção e realização desses trabalhos. A proposta instaura-se nas problemáticas contemporâneas da representação de objetos na pintura (natureza-morta) através do emprego da imagem técnica, processo pictórico relacionado ao conceito de mestiçagem. Identificadas nas estratégias poéticas as questões deslocaram-se dos objetos para o ruído gerado pela mediação técnica (óptica) do modelo. O confronto entre a prática de ateliê e os dados coletados, visuais e conceituais, pretende revitalizar a pintura, permeando este fazer manual com a percepção adquirida da mediação técnica, a fim de gerar uma visualidade que dialogue com as questões eminentes da contemporaneidade.
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Laratro, Alex James. "Self-noise of Airfoils Under Stalled Conditions." Thesis, 2017. http://hdl.handle.net/2440/119324.

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In recent years there have been reports of a transient impulsive noise signature being produced sporadically by wind turbines. Impulsive noise, where the noise level periodically increases and decreases at a rapid rate, is of concern to industry as turbines producing this noise restricts the growth potential of wind farms. By developing noise control techniques in order to mitigate the production of impulsive noise, it is easier for wind farm operators to comply with noise regulations, removing a significant barrier to growth and reducing the impact on the comfort of nearby residents. One of the likely candidates for the source of impulsive wind turbine noise is stall of the turbine blade. While it is well understood that an increase in turbulence near a hard surface results in an increase sound production, the sound generated by airfoils under stall conditions is not well researched. The purpose of this thesis is to investigate the sound generated by simple airfoils under stall conditions in order to further the understanding of this noise. In recent publications on the noise produced by stalling airfoils, the noise has been divided into two categories. For much of the stall regime the noise is referred to as “deep stall" noise, where the airfoil sheds large vortices at a specific frequency. This is then contrasted with a “light stall" noise regime, where the noise produced is more broadband and the source mechanism is less well understood. The primary focus of this thesis is to understand of the effect of airfoil profile on this “light stall" noise. The data presented in this thesis show that as the airfoils enter a stalled state, a low frequency dipolar noise appears. The production of this noise corresponds to amplitude increases in the turbulent wake spectra seen in literature and this correlation between noise production and wake spectra was subsequently confirmed by studying the wake velocity spectra. It was found that there was significant coherence between the wake velocity and sound signals, indicating that the source of the noise produced at “light stall" is due to vorticity generated in the fully-separated boundary layer as the airfoil enters a stalled state. The primary effect of the airfoil profile on the noise generated at stall is in the rate at which it increases with respect to angle of attack. A NACA 0021 airfoil was found to have a much sharper increase in noise level with respect to angle of attack as it reaches the stall angle, compared with the thinner NACA 0012 profile and a flat plate. This can be related to the rate of change in lift force and the aforementioned changes in wake spectrum. A sharper increase in noise level with angle of attack is significant because it will lead to a more impulsive amplitude-modulation of the sound signal if the angle of attack of the airfoil is varying periodically with time. As wind turbines can experience stall due to unsteady inflow, this represents more evidence that stall is the source of the impulsive noise observed in the field. Subsequently, an investigation was conducted on the effect of strong vortices, shed by airfoils undergoing dynamic stall, on the directivity of stall noise. A vortex generator was used to produce isolated vortices with a similar time-varying profile to a decaying dynamic stall vortex in order to study these effects in isolation. The effect of this changing vortex on the directivity of sound was measured and compared with a quasi-steady model derived from the literature, which indicated that there is no significant difference between quasisteady modelling and the observed effects under the conditions that wind turbine airfoils can be expected to encounter. Using a quasi-steady approach the effect of refraction through shed dynamic stall vortices on airfoil noise can be modelled, and applied to wind turbines. Estimates indicate that large horizontal axis wind turbines are capable of producing dynamic vortices strong enough to induce significant scattering, however these vortices are produced on the inboard sections of the blade, and the dynamic stall is unlikely to occur on the outboard sections where the majority of the blade noise is generated. Overall, the current research indicates that noise produced as an airfoil enters stall (the “light stall" regime) is a strong candidate for the source of impulsive wind turbine noise. In addition, the occurrence of dynamic stall may be causing short-term changes in noise directivity due to refraction of the sound and this is worth considering in future wind turbine noise modelling efforts.
Thesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2017
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Chen, Shu-Yi, and 陳淑怡. "A study on the method of impulsive noise removal for still images." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/98242014498423079893.

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碩士
國立彰化師範大學
資訊管理學系
90
In this thesis, three impulsive noise removal methods for still images are proposed. In the first method, the center pixel value and its surrounding neighbors in the scanning window are sorted. After sorting, depend on the rank of the center pixel value, we decide whether it is a corrupted pixel. If rank falls into the predefined range, center pixel is considered as a normal one. Otherwise, in order to eliminate impulsive noise more accurate, the second detection will be processed. We calculate the absolute difference between center weighted median (weight= 3) and center pixel. The filtering output is according to the result of comparison between the absolute difference and threshold. In the second method, we calculate the difference between the center pixel and its surroundings neighbors in the scanning window. If the absolute difference is smaller than the predefined threshold, the symbol ‘flag’ is set to 1. Otherwise, it is equal to 0. After that, we sum up the value of flags in the scanning window and call it “similar degree”. The proposed filter is based on the “similar degree” to decide that the center pixel is replaced by the output of standard median, center weighted median or unchanged. One characteristic of image is that each pixel is very close to surrounding neighbors. If the impulsive noise appears in the local area, it will be very abruptly. The proposed scheme is based on this property. In the third method, we choose several neighboring pixels around the center pixel in the scanning window as the statistic factors. We acquire mean value and average absolute difference among those neighboring pixels and use them to compute a range value. The range value is a representative characteristic of those pixels in the local area and we can use it to identify the noise. If the detected pixel falls into the range, it is considered as an uncorrupted pixel. Otherwise, it is noise and replaced by the output of center weighted median.
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Books on the topic "Stall noise"

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Abdol-Hamid, Khaled S. Multiscale turbulence effects in supersonic jets exhausting into still air. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Office, 1987.

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Standardization, International Organization for. Photography--electronic still-picture imaging--noise measurements =: Photographie-imagerie des prises de vue électroniques-mesurages du bruit. Geneva, Switzerland: ISO, 2003.

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Kukulin, I. Mashiny zashumevshego vremeni: Kak sovetskiĭ montazh stal metodom neofit︠s︡ialʹnoĭ kulʹtury = Machines of noisy time : How early Soviet montage became a method of unofficial art. Moskva: Novoe literaturnoe obozrenie, 2015.

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unk. Still Noise : Australian Rock Photography. ABC Books, 1991.

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Lauder, Afferbeck. Strine: Let Stalk Strine and Nose Tone Unturned. Australia in Print, 1989.

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Sundberg, Minna. Stand Still - Stay Silent, Book 2. Hiveworks, 2018.

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LA CHAMBRE NOIRE. GERMAINE DE STAEL ET LA PENSEE DU NEGATIF. DROZ, 2016.

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Boutin, Aimée. Introduction. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252039218.003.0001.

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This introductory chapter provides an overview of the book's main themes. This book adopts a sensory approach to understanding the city as a sonic space that orchestrates different, often conflicting sound culture. It shows how city noise heightens the significance of selective listening in the modern urban condition and argues for an aural rather than visual conception of modernity. In nineteenth-century Paris, urban renewal did not mark the beginning of a period of diminution of sound, but rather it was a time of increasing awareness of, and emphasis on, noise. By reconsidering the myth of Paris as the city of spectacle, where the flâneur's scopophilia reigns supreme, this book attends to what has been silenced by the visual paradigm that still prevails in nineteenth-century French cultural studies. It explores perceptions of street noise in nineteenth-century Paris by selecting specific sounds from the 1830s to the 1890s—peddling sounds—that were distinctive.
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Little, Jean. Julieta, Estate Quieta!/julieta, Be Still. Tandem Library, 1994.

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Succi, Sauro. Lattice Boltzmann Models without Underlying Boolean Microdynamics. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199592357.003.0013.

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Chapter 12 showed how to circumvent two major stumbling blocks of the LGCA approach: statistical noise and exponential complexity of the collision rule. Yet, the ensuing LB still remains connected to low Reynolds flows, due to the low collisionality of the underlying LGCA rules. The high-viscosity barrier was broken just a few months later, when it was realized how to devise LB models top-down, i.e., based on the macroscopic hydrodynamic target, rather than bottom-up, from underlying microdynamics. Most importantly, besides breaking the low-Reynolds barrier, the top-down approach has proven very influential for many subsequent developments of the LB method to this day.
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Book chapters on the topic "Stall noise"

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Kirchner, Matthias. "Sensor Fingerprints: Camera Identification and Beyond." In Multimedia Forensics, 65–88. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7621-5_4.

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AbstractEvery imaging sensor introduces a certain amount of noise to the images it captures—slight fluctuations in the intensity of individual pixels even when the sensor plane was lit absolutely homogeneously. One of the breakthrough discoveries in multimedia forensics is that photo-response non-uniformity (PRNU), a multiplicative noise component caused by inevitable variations in the manufacturing process of sensor elements, is essentially a sensor fingerprint that can be estimated from and detected in arbitrary images. This chapter reviews the rich body of literature on camera identification from sensor noise fingerprints with an emphasis on still images from digital cameras and the evolving challenges in this domain.
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Klingner, Marvin, and Tim Fingscheidt. "Improved DNN Robustness by Multi-task Training with an Auxiliary Self-Supervised Task." In Deep Neural Networks and Data for Automated Driving, 149–70. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-01233-4_5.

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AbstractWhile deep neural networks for environment perception tasks in autonomous driving systems often achieve impressive performance on clean and well-prepared images, their robustness under real conditions, i.e., on images being perturbed with noise patterns or adversarial attacks, is often subject to a significantly decreased performance. In this chapter, we address this problem for the task of semantic segmentation by proposing multi-task training with the additional task of depth estimation with the goal to improve the DNN robustness. This method has a very wide potential applicability as the additional depth estimation task can be trained in a self-supervised fashion, relying only on unlabeled image sequences during training. The final trained segmentation DNN is, however, still applicable on a single-image basis during inference without additional computational overhead compared to the single-task model. Additionally, our evaluation introduces a measure which allows for a meaningful comparison between different noise and attack types. We show the effectiveness of our approach on the Cityscapes and KITTI datasets, where our method improves the DNN performance w.r.t. the single-task baseline in terms of robustness against multiple noise and adversarial attack types, which is supplemented by an improved absolute prediction performance of the resulting DNN.
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Burnazzi, Marco, Jakob Thiemeier, and Rolf Radespiel. "Numerical Stall Behavior Investigation of an Aircraft Equipped with Coanda Flap and Droop Nose." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 3–16. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27279-5_1.

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Aryblia, Maria, Lúcio Quintal, Μiguel Ribeiro, Nikolaos Sifakis, Stavroula Tournaki, and Theocharis Tsoutsos. "Climate Change Mitigation Through Smart Environmental Monitoring of the Urban Ecosystem in Insular Touristic Cities: Experience from Rethymno and Madeira." In Sustainable Mobility for Island Destinations, 129–47. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73715-3_8.

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AbstractCities, and general urban areas, contribute critically to climate change because of the GHGs related to traffic congestion, fossil fuel consumption, noise and air pollution. Air pollution, despite the noteworthy improvements during the last decades, still plays a significant role in the quality of living in European cities as it causes damages to health and ecosystems, thus making urgent the immoderate need of diminishing it. Within the Horizon 2020 CIVITAS DESTINATIONS project, six European island cities, which are highly attractive destinations for tourists worldwide, implemented various sustainable mobility measures. Among them, Funchal, Madeira-Portugal, and Rethymno, Crete-Greece, implemented two different environmental monitoring systems to measure and calculate a predetermined set of indicators, capable of estimating the environmental benefits in transport, economy, society, energy, and the environment. The monitoring systems were installed in specific sites all around these two cities, aiming, through the integrated sensors, to collect environmental data related to transport load, such as environmental indexes (temperature, humidity, noise) and air pollutants (CO2, CO, NOx, SO2, PM). The collection of critical and reliable data offers the opportunity for an effective evaluation of the overall performance of the implemented measures toward sustainable, environmentally friendly, and low-carbon mobility policies.
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Rocha, Rogério V. M., Pedro P. Libório, Harsh Kupwade Patil, and Diego F. Aranha. "A Differentially Private Hybrid Approach to Traffic Monitoring." In Applied Cryptography and Network Security, 233–56. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78375-4_10.

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AbstractIn recent years, privacy research has been gaining ground in vehicular communication technologies. Collecting data from connected vehicles presents a range of opportunities for industry and government to perform data analytics. Although many researchers have explored some privacy solutions for vehicular communications, the conditions to deploy them are still maturing, especially when it comes to privacy for sensitive data aggregation analysis. In this work, we propose a hybrid solution combining the original differential privacy framework with an instance-based additive noise technique. The results show that for typical instances we obtain a significant reduction in outliers. As far as we know, our paper is the first detailed experimental evaluation of differentially private techniques applied to traffic monitoring. The validation of the proposed solution was performed through extensive simulations in typical traffic scenarios using real data.
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Runefelt, Leif. "Threat or Nuisance? Foreign Street Entertainers in the Swedish Press, 1800–1880." In Baltic Hospitality from the Middle Ages to the Twentieth Century, 303–28. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98527-1_12.

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AbstractThis chapter analyzes the changing public opinion towards street entertainers, as expressed in nineteenth-century Swedish press, identifying a shift towards a discourse of securitization 1850. Until then, entertainers were seldom mentioned and occasionally seen as a positive element of urban social life; their services were often appreciated, and this in a country which otherwise had developed strong legal institutions for controlling and rejecting itinerant and marginalized individuals. From 1850, entertainers became more present in the press, the tone being almost completely negative, portraying them as threats to public morals and economy. Criticism focused on three issues. Firstly, entertainers were claimed to be beggars in disguise, parasites on the social body. Secondly, they made noise, making everyday life a nuisance to the urban population. Lastly, their use of children was used to emphasize their inhumane greed. Behind the shift was an increase in the numbers of entertainers following processes of proletarization in Europe, but also the growth of a middle-class striving to take control of city spaces. Between the lines, it becomes clear that entertainers still were popular among working classes. The discourse of securitization seems to have lacked the necessary audience, and the outcries against entertainers mostly without effect.
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Richardson, Sunil, and Rakshit Vijay Sinai Khandeparker. "Cleft Rhinoplasty." In Oral and Maxillofacial Surgery for the Clinician, 1703–32. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-1346-6_76.

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AbstractCleft rhinoplasty is one of the most difficult and challenging aesthetic surgeries to carry out and bears a significant impact on the overall nasal aesthetics and function. Two reasons understood for this are the simultaneous involvement of all the layers of the nose including the skin, cartilage, skeleton and vestibular lining (this being the principal reason) and the significant scarring that is the consequence of multiple previous surgical interventions. There is a mention of numerous techniques for ultimate correction of unilateral and bilateral cleft nasal deformities but no single technique has till date provided a definite solution for correction of all the problems that accompany these deformities. There is a revised interest in performing primary rhinoplasties at the time of lip repair with or without presurgical orthopedics but these procedures may still warrant definitive rhinoplasty at a later date. The purpose of this chapter is to provide a comprehensive review of cleft rhinoplasty in the most systematic manner beginning with the pathologic anatomy followed by surgical timing, pre-operative evaluation and surgical correction. The chapter also discusses the use of various grafts in a typical cleft rhinoplasty case as well as treatment strategy for management of both, unilateral and bilateral cleft nasal deformities. The outcomes as well as complications and a note on further revisions have also been presented.
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"Structural Film: Noise." In Still Moving, 62–90. Duke University Press, 2020. http://dx.doi.org/10.1515/9780822391432-006.

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Fradi, Marwa, Kais Bouallegue, Philippe Lasaygues, and Mohsen Machhout. "Automatic Noise Reduction in Ultrasonic Computed Tomography Image for Adult Bone Fracture Detection." In Biomedical Engineering. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101714.

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Noise reduction in medical image analysis is still an interesting hot topic, especially in the field of ultrasonic images. Actually, a big concern has been given to automatically reducing noise in human-bone ultrasonic computed tomography (USCT) images. In this chapter, a new hardware prototype, called USCT, is used but images given by this device are noisy and difficult to interpret. Our approach aims to reinforce the peak signal-to-noise ratio (PSNR) in these images to perform an automatic segmentation for bone structures and pathology detection. First, we propose to improve USCT image quality by implementing the discrete wavelet transform algorithm. Second, we focus on a hybrid algorithm combining the k-means with the Otsu method, hence improving the PSNR. Our assessment of the performance shows that the algorithmic approach is comparable with recent methods. It outperforms most of them with its ability to enhance the PSNR to detect edges and pathologies in the USCT images. Our proposed algorithm can be generalized to any medical image to carry out automatic image diagnosis due to noise reduction, and then we have to overcome classical medical image analysis by achieving a short-time process.
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Zapperi, Stefano. "The Barkhausen Effect." In Crackling Noise, 131–53. Oxford University PressOxford, 2022. http://dx.doi.org/10.1093/oso/9780192856951.003.0008.

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Abstract In 1919 H. Barkhausen discovered that the magnetization of iron is associated to a crackling noise that could be revealed as an inductionpulse in a coil. This observation provided an indirect indication of the existence of ferromagnetic domains and stimulated an intense research activity spanning eight decades. The Barkhausen effect is probably the cleanest example where the mechanism of self-organized criticality can be applied to an experiment. The scaling exponents describing Barkhausen avalanche distributions in bulk materials can be quantitatively explained by studying the depinning of domain walls. Our understanding is still not complete in the case of magnetic thin films where the domain structure and the avalanche dynamics are often quite intricate.
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Conference papers on the topic "Stall noise"

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Wolf, William R., Joseph G. Kocheemoolayil, and Sanjiva K. Lele. "Large Eddy Simulation of Stall Noise." In 20th AIAA/CEAS Aeroacoustics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-3182.

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Moreau, Stephane, Michel Roger, and Julien Christophe. "Flow Features and Self-Noise of Airfoils Near Stall or in Stall." In 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference). Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-3198.

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Mayer, Yannick, Bin Zang, and Mahdi Azarpeyvand. "A preliminary study of dynamic stall noise." In AIAA Scitech 2020 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2020. http://dx.doi.org/10.2514/6.2020-1254.

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Shi, Yuejun, and Denghui Qin. "SAS-based Airfoil Trailing Edge Noise Prediction in Stall Conditions." In AIAA AVIATION 2020 FORUM. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2020. http://dx.doi.org/10.2514/6.2020-2744.

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Robinette, Darrell, Carl Anderson, Jason Blough, Mark Johnson, Don Maddock, and Jean Schweitzer. "Characterizing the Effect of Automotive Torque Converter Design Parameters on the Onset of Cavitation at Stall." In SAE 2007 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2007. http://dx.doi.org/10.4271/2007-01-2231.

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Shi, Yuejun, and Denghui Qin. "Withdrawal: SAS-based Airfoil Trailing Edge Noise Prediction in Stall Conditions." In AIAA AVIATION 2020 FORUM. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2020. http://dx.doi.org/10.2514/6.2020-2744.c1.

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Raus, David, Benjamin Cotté, Romain Monchaux, Lisa Sicard, Emmanuel Jondeau, Pascal Souchotte, and Michel Roger. "Experimental characterization of the noise generated by an airfoil oscillating above stall." In AIAA AVIATION 2021 FORUM. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2021. http://dx.doi.org/10.2514/6.2021-2291.

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Lacagnina, Giovanni, Chaitanya Paruchuri, Tim A. Berk, Phillip Joseph, Seyed Mohammad Hasheminejad, Oksana Stalnov, Tze Pei Chong, and Bharathram Ganapathisubramani. "Effect of Leading Edge serrations in reducing aerofoil noise near stall conditions." In 2018 AIAA/CEAS Aeroacoustics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-3285.

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Čudina, Mirko. "Flow Instabilities and Noise Generation in Vane Axial Fans Due to Rotating Stall and Surge." In International Off-Highway & Powerplant Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1995. http://dx.doi.org/10.4271/952104.

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Tryfonidis, M., O. Etchevers, J. D. Paduano, A. H. Epstein, and G. J. Hendricks. "Pre-Stall Behavior of Several High-Speed Compressors." In ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-387.

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High speed compressor data immediately prior to rotating stall inception are analyzed and compared to stability theory. New techniques for the detection of small amplitude rotating waves in the presence of noise are detailed and experimental and signal processing pitfalls discussed. In all nine compressors examined, rotating stall precedes surge. Prior to rotating stall inception, all the machines support small-amplitude (<1% of fully developed stall) waves travelling about the circumference. Travelling wave strength and structure are shown to be a strong function of corrected speed. At low speeds, a −0.5 times shaft speed wave is present for hundreds of rotor revolutions prior to stall initiation. At 100% speed, a shaft speed rotating wave dominates, growing as stall initiation is approached (fully developed rotating stall occurs at about 1/2 of shaft speed). A new, 2-D, compressible hydrodynamic stability analysis is applied to the geometry of two of the compressors and gives results in agreement with data. The calculations show that, at low corrected speeds, these compressors behave predominantly as incompressible machines. The wave which first goes unstable is the 1/2 shaft frequency mode predicted by the incompressible Moore-Greitzer analysis and previously observed in low speed compressors. Compressibility becomes important at high corrected speeds and adds axial structure to the rotating waves. At 100% corrected speed, it is one of these hitherto unrecognized compressible modes which goes unstable first. The rotating frequency of this mode is constant and predicted to be approximately coincident with shaft speed at design. Thus, it is susceptible to excitation by geometric nonuniformities in the compressor. This new understanding of compressor dynamics is used to introduce the concept of travelling wave energy as a measure of compressor stability. Such a wave energy-based scheme is shown to consistently give an indication of low stability for significant periods (100–200 rotor revolutions) before stall initiation, even at 100% corrected speed.
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