Relevant bibliographies by topics / Farfield

Academic literature on the topic 'Farfield'

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Published: 4 June 2021
Last updated: 31 January 2023

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Journal articles on the topic "Farfield"

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Sartori, M. A. "Farfield acoustic radiation reduction." Journal of the Acoustical Society of America 104, no. 1 (July 1998): 26. http://dx.doi.org/10.1121/1.424023.

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Groopman, Amber M., and Matthew D. Guild. "Superresolution using synthetic shaped acoustic vortex waves in water." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A246. http://dx.doi.org/10.1121/10.0016158.

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Acoustic vortex waves have previously been shown to be able to overcome the diffraction limit, through the use of subdiffraction-limited pressure nulls that propagate well into the farfield. Acoustic vortex waves, therefore, present a novel means to achieve farfield superresolution imaging. However, generating acoustic vortex waves in an experimental setting typically requires a complicated phased array consisting of multiple active elements in a fixed geometrical configuration. In this work, we describe how an acoustic vortex wave can be generated using a synthetized vortex wave array applied during post-processing to in-water 2D plane measurements obtained with a single moving acoustic source and a fixed receiver. The geometric versatility of the synthetic vortex array enables different shaped acoustic vortex patterns to be achieved using the same in-water measurements. Experimental and theoretical results of the magnitude and phase of the nearfield and farfield pressure fields will be presented for a variety of geometric configurations and vortex integer wave modes of the synthesized vortex wave array. The data show excellent agreement with expected results and demonstrates shaped acoustic vortices with superresolved features in both the nearfield and farfield. [Work supported by the Office of Naval Research.]
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Mukherjee, P., and L. N. Hazra. "Self-Similarity in Transverse Intensity Distributions in the Farfield Diffraction Pattern of Radial Walsh Filters." Advances in Optics 2014 (September 17, 2014): 1–7. http://dx.doi.org/10.1155/2014/352316.

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In a recent communication we reported the self-similarity in radial Walsh filters. The set of radial Walsh filters have been classified into distinct self-similar groups, where members of each group possess self-similar structures or phase sequences. It has been observed that, the axial intensity distributions in the farfield diffraction pattern of these self-similar radial Walsh filters are also self-similar. In this paper we report the self-similarity in the intensity distributions on a transverse plane in the farfield diffraction patterns of the self-similar radial Walsh filters.
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Kondrat, О. R., N. М. Hedzyk, and V. О. Prykhodko. "Pressure build-up test application in reservoir boundary structure determination." Prospecting and Development of Oil and Gas Fields, no. 2(79) (June 27, 2021): 32–42. http://dx.doi.org/10.31471/1993-9973-2021-2(79)-32-42.

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The design of highly efficient field development systems, their control and management require reliable information about the reservoir properties and structure of productive deposits. Among the most common and informative methods of obtaining information is well testing with the help of pressure build-up curves (PBU). The latter make it possible to study the structure and parameters of the farfield at a considerable distance from the well (tens and hundreds of meters), which allows to make informed decisions in the process of field development. Therefore, the use of PBU test interpretation methods in order to obtain maximum information is extremely relevant for hydrocarbon recovery processes. Well testing under nonequilibrium filtration conditions is one of the powerful tools for assessing the reservoir parameters, the structure of the farfield and assessing the well potential. The use of modern software tools for well test results interpretation allows to obtain much more information from the classical results, to clarify the structure of the field and the parameters of productive reservoirs. The aim of this work is to generalize the world experience of the farfield influence on the character of PBU and its derivative during well testing under nonequilibrium filtration conditions. The study has been conducted using the KAPPA Saphir software package, licensed for use by IFNTUOG for educational purposes. The above methods of PBU interpretation can be used to determine the farfield parameters and structure. On the basis of those one can make effective decisions on field development managing and during 3D geological models creation.
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Zhu, Yi, Jiayi He, Huiyu Wu, Wei Li, Francis Noblesse, and Gerard Delhommeau. "Elementary ship models and farfield waves." European Journal of Mechanics - B/Fluids 67 (January 2018): 231–41. http://dx.doi.org/10.1016/j.euromechflu.2017.09.013.

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Sini, M. "Reconstruction of complex obstacles by farfield measurements." Journal of Physics: Conference Series 124 (July 1, 2008): 012045. http://dx.doi.org/10.1088/1742-6596/124/1/012045.

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Borgiotti, Giorgio V., and Eric Rosen. "Farfield projection from sparse nearfield measurement samples." Journal of the Acoustical Society of America 86, S1 (November 1989): S117—S118. http://dx.doi.org/10.1121/1.2027327.

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Viswanathan, K. "True Farfield for Dual-Stream Jet Noise Measurements." AIAA Journal 49, no. 2 (February 2011): 443–47. http://dx.doi.org/10.2514/1.j050771.

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NAGAMATSU, Masao. "335 The farfield measurement of converted NAH method." Proceedings of the Dynamics & Design Conference 2007 (2007): _335–1_—_335–4_. http://dx.doi.org/10.1299/jsmedmc.2007._335-1_.

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Mueller, Arnold W., Otis S. Childress, and Mark Hardesty. "Helicopter rotor speed effects on farfield acoustic levels." Journal of the Acoustical Society of America 82, S1 (November 1987): S28. http://dx.doi.org/10.1121/1.2024732.

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Dissertations / Theses on the topic "Farfield"

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McCormick, Daniel John. "An Analysis of Using CFD in Conceptual Aircraft Design." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/33409.

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The evaluation of how Computational Fluid Dynamics (CFD) package may be incorporated into a conceptual design method is performed. The repeatability of the CFD solution as well as the accuracy of the calculated aerodynamic coefficients and pressure distributions was also evaluated on two different wing-body models. The overall run times of three different mesh densities was also evaluated to investigate if the mesh density could be reduced enough so that the computational stage of the CFD cycle may become affordable to use in the conceptual design stage. A farfield method was derived and used in this analysis to calculate the lift and drag coefficients. The CFD solutions were also compared with two methods currently used in conceptual design - the vortex lattice based program Vorview and ACSYNT. The unstructured Euler based CFD package FELISA was used in this study.
Master of Science
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Apte, Vibhavari. "Measurement and computer simulation of the farfield patterns for turning-mirror surface-emitting diode lasers." Full text open access at:, 1988. http://content.ohsu.edu/u?/etd,172.

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Woolston, Scott R. "Development of methods to propagate energy density and predict farfield directivity using nearfield acoustic holography /." Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd3016.pdf.

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Woolston, Scott Richard. "Development of Methods to Propagate Energy Density and Predict Farfield Directivity Using Nearfield Acoustic Holography." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1726.

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Acoustical-based imaging systems have found merit in determining the behavior of vibrating structures. This thesis focuses on the continued development of the nearfield acoustic holography (NAH) approach. Conventional NAH consists of first measuring the pressure field on a two-dimensional conformal surface and then propagating this data back to the vibrating structure to obtain information about the source, such as the normal velocity distribution. Recent work has been done which incorporates particle velocity information into the traditional NAH measurements to reduce the number of measurements required. This advancement has made NAH a more affordable tool for acoustical imaging and sound field characterization. It is proposed that the inclusion of velocity information into traditional NAH can further increase its usefulness. By propagating the velocity and pressure values independently and recombining them on the reconstruction surface, the pressure field and energy density fields can be predicted at any point in the sound field. It is also proposed that the same NAH measurement can be used to predict farfield directivity. The inclusion of velocity values into the NAH technique also provides a means for predicting energy density (ED) anywhere within the acoustic field. These two developments would allow a single NAH measurement to provide much more information about an acoustic source and its radiated sound field. Experimental testing shows that NAH is successful at predicting the shape of the resulting ED field and directivity pattern with some error in amplitude. The best performance of the technique is with a planer source resulting in an average amplitude error of 18.5% over the entire field.
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Turkdogru, Nurkan. "Validity of the point source assumption of a rotor for farfield acoustic measurements with and without shielding." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37226.

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Measuring the farfield noise levels of full-scale rotor systems is not trivial and can be costly. Researchers prefer to perform small-scale experiments in the laboratory so that they can extrapolate the model scaled results to the larger scale. Typically Inverse Square Law (ISL) is used to extrapolate the sound pressure levels (SPL), obtained from model-scale experiments at relatively small distances to predict noise at much larger distances for larger scale systems. The assumption underlying this extrapolation is that the source itself can be treated as a point sound source. At what distance from a rotor system it can be treated as a point source has never been established. Likewise, many theoretical models of shielding by hard surfaces assume the source to be a point monopole source. If one is interested in shielding the noise of a rotor system by interposing a hard surface between the rotor and the observer, can the rotor system really be considered to be a monopole? If rotating noise sources are under consideration what is the effect of configuration and design parameters? Exploring the validity of point source assumption alluded to above for a rotor for farfield acoustic measurements with and without shielding form the backbone of the present work.
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Ward, Darren Brett, and db_ward@hotmail com. "Theory and application of broadband frequency invariant beamforming." The Australian National University. Faculty of Engineering and Information Technology, 1996. http://thesis.anu.edu.au./public/adt-ANU20050418.112459.

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In many engineering applications, including radar, sonar, communications and seismology, the direction of impinging signal wavefronts can be used to discriminate between competing sources. Often these source signals cover a wide bandwidth and conventional narrowband beamforming techniques are ineffective, since spatial resolution varies significantly across the band. In this thesis we consider the problem of beamforming for broadband signals, primarily when the spatial response remains constant as a function of frequency. This is called a frequency invariant beamformer (FIB).¶ Rather than applying the numerical technique of multi-parameter optimisation to solve for the beamformer parameters, we attempt to address the fundamental nature of the FIB problem. The general philosophy is to use a theoretical continuous sensor to derive relationships between a desired FI beampattern and the required signal processing structure. Beamforming using an array of discrete sensors can then be formulated as an approximation problem. This approach reveals a natural structure to the FIB which is otherwise buried in a numerical optimisation procedure.¶ Measured results from a microphone array are presented to verify that the simple FIB structure can be successfully implemented. We then consider imposing broadband pattern nulls in the FI beampattern, and show that (i) it is possible to impose an exact null which is present over all frequencies, and (ii) it is possible to calculate a priori how many constraints are required to achieve a null of a given depth in a FIB. We also show that the FIB can be applied to the problem of broadband direction of arrival (DOA) estimation and provides computational advantages over other broadband DOA estimators.¶ Through the theoretical continuous sensor approach, we show that the FIB theory can be generalised to the problem of designing a general broadband beamformer (GBB) which realizes a broadband angle-versus-frequency beampattern specification. Coupled with a technique for radial beampattern transformation, the GBB can be applied to a wide class of problems covering both nearfield beamforming (in which the shape of the impinging wavefront must be considered and farfield beamforming (which is simplified by the assumption of planar wavefronts) for a broadband beampattern specified over both angle and frequency.
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Abhayapala, P. Thushara D., and Thushara Abhayapala@anu edu au. "Modal Analysis and Synthesis of Broadband Nearfield Beamforming Arrays." The Australian National University. Telecommunications Engineering Group, 2000. http://thesis.anu.edu.au./public/adt-ANU20010905.121231.

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This thesis considers the design of a beamformer which can enhance desired signals in an environment consisting of broadband nearfield and/or farfield sources. The thesis contains: a formulation of a set of analysis tools which can provide insight into the intrinsic structure of array processing problems; a methodology for nearfield beamforming; theory and design of a general broadband beamformer; and a consideration of a coherent nearfield broadband adaptive beamforming problem. To a lesser extent, the source localization problem and background noise modeling are also treated. ¶: A set of analysis tools called modal analysis techniques which can be used to a solve wider class of array signal processing problems, is first formulated. The solution to the classical wave equation is studied in detail and exploited in order to develop these techniques. ¶: Three novel methods of designing a beamformer having a desired nearfield broadband beampattern are presented. The first method uses the modal analysis techniques to transform the desired nearfield beampattern to an equivalent farfield beampattern. A farfield beamformer is then designed for a transformed farfield beampattern which, if achieved, gives the desired nearfield pattern exactly. The second method establishes an asymptotic equivalence, up to complex conjugation, of two problems: (i) determining the nearfield performance of a farfield beampattern specification, and (ii) determining the equivalent farfield beampattern corresponding to a nearfield beampattern specification. Using this reciprocity relationship a computationally simple nearfield beamforming procedure is developed. The third method uses the modal analysis techniques to find a linear transformation between the array weights required to have the desired beampattern for farfield and nearfield, respectively. ¶: An efficient parameterization for the general broadband beamforming problem is introduced with a single parameter to focus the beamformer to a desired operating radius and another set of parameters to control the actual broadband beampattern shape. This parameterization is derived using the modal analysis techniques and the concept of the theoretical continuous aperture. ¶: A design of an adaptive beamformer to operate in a signal environment consisting of broadband nearfield sources, where some of interfering signals may be correlated with desired signal is also considered. Application of modal analysis techniques to noise modeling and broadband coherent source localization conclude the thesis.
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Vasudevan, Namboodiri Mahesh [Verfasser], Arnulf [Akademischer Betreuer] Materny, Veit [Akademischer Betreuer] Wagner, and Günter [Akademischer Betreuer] Flachenecker. "Time Resolved Spectroscopy in the Nearfield and Farfield: Probing Ultrafast Molecular Dynamics and Subwavelength Resolution Imaging / Mahesh Vasudevan Namboodiri. Betreuer: Arnulf Materny. Gutachter: Arnulf Materny ; Veit Wagner ; Günter Flachenecker." Bremen : IRC-Library, Information Resource Center der Jacobs University Bremen, 2013. http://d-nb.info/1087274834/34.

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Gregorio, Helvio Prevelato. "Modelagem numérica da dispersão da pluma do emissário submarino de Santos." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/21/21132/tde-19012010-165632/.

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A dispersão dos efluentes do emissário submarino de Santos foi estudada por meio de modelagem numérica, acoplando-se modelos hidrodinâmico, de dispersão no campo próximo e no campo distante. As simulações foram realizadas para o projeto original do emissário de 1979, para a nova configuração de 2009 e para terceiro arranjo sugerido por este estudo, que dobra o comprimento do duto em relação ao projeto original. As diluições foram modeladas em cenários ambientais com propriedades marinhas e estuarinas climatológicas de verão, juntamente com forçantes atmosféricas climatológicas da mesma estação, simulando ausência de vento, presença de vento médio e presença de vento médio seguido por passagem de frente fria climatológica (obtida por este estudo). Com as devidas validações do modelo hidrodinâmico, a diluição, tanto no campo próximo quanto no campo distante, foi fortemente regida pela estratificação da coluna dágua e pela velocidade das correntes. O cenário sem vento apresentou as maiores estratificações, menores velocidades e originou as menores diluições em oposição ao cenário que simulou a passagem de frente fria. Dentre os projetos de emissário analisados, aquele proposto por este estudo apresentou plumas com menores comprimentos horizontais e menores profundidades, atingindo a costa uma só vez. O projeto original e o novo que será implantado em 2009 apresentaram, comparativamente, plumas mais extensas e profundas, interceptando a costa em diversas situações.
Sewage plume dispersion for the Santos outfall was studied using numerical models, coupling hydrodynamic, near field and far field models. Experiments were conducted for the 1979 original outfall design, for the new 2009 outfall configuration and also for a third arrangement suggested here, which duplicates the emissary length comparatively to the original 1979 project. Dilutions were modeled in environmental sceneries with summer climatological estuarine and marine properties, together with climatological atmospheric forcing for the same season, simulating no wind conditions, mean wind forcing and mean wind followed by a climatological cold front (developed at this study) passage. After the appropriate hydrodynamic numerical model validation, the dilution, at the near field as well as at the far field, was strongly determined by the vertical water stratification and by the current velocities. The no-wind scenery presented the highest stratifications, smallest velocities and originated the smallest dilutions, in opposition to the cold-front-scenery. Among the sewage outfall projects considered, the one presented at this study showed the shallowest plumes, with the smallest horizontal lengths, reaching the coast only once. The original 1979 project and the 2009 configuration showed, comparatively, the deepest and widest plumes reaching the coast in several situations.
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Ryh-Shin, Tsai, and 蔡日興. "Nearfield and farfield emission characteristics of microdisk lasers." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/22738888075664801367.

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碩士
國立交通大學
光電(科學)研究所
83
In this thesis, we discuss the resonance cavity modes of microdisk lasers and the corresponding farfield emisssion patterns. Besides conventional circular microdisk lasers, we introduce the point matching method to solve the cavity modes of noncircular microdisks. And we further discuss how the changes in disk shape influences the farfield emission pattern of microdisk lasers.
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Books on the topic "Farfield"

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Nation, Kaleb. Bran Hambric: The Farfield curse. Naperville, Ill: Jabberwocky, 2009.

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Moore, S. G. Inspection report [on] Farsley Farfield Primary School: Dates of inspection 2-6 March 1998. [London]: Ofsted, 1998.

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Mokry, M. Influence of the transonic doublet in the farfield of a lifting airfoil. Ottawa: National Research Council Canada, Institute for Aerospace Research, 1993.

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Hazra, Lakshminarayan, and Pubali Mukherjee. Self-similarity in Walsh Functions and in the Farfield Diffraction Patterns of Radial Walsh Filters. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-2809-0.

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Nation, Kaleb. Farfield Curse. Open Road Integrated Media, Inc., 2014.

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Nation, Kaleb. Farfield Curse. Open Road Integrated Media, Inc., 2014.

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Bran Hambric: The Farfield Curse. Scholastic Inc., 2010.

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Dorman, Brandon, and Kaleb Nation. Bran Hambric: The Farfield Curse. Sourcebooks Young Readers, 2009.

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Bran Hambric: The Farfield Curse. Sourcebooks Jabberwocky, 2010.

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Mukherjee, Pubali, and Lakshminarayan Hazra. Self-Similarity in Walsh Functions and in the Farfield Diffraction Patterns of Radial Walsh Filters. Springer Singapore Pte. Limited, 2017.

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Book chapters on the topic "Farfield"

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Setitra, Insaf, Slimane Larabi, and Takeaki Uno. "A Framework for Object Classification in Farfield Videos." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 159–66. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18802-7_23.

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Duda, Benjamin, and Ehab Fares. "Farfield Noise Prediction Using Large-Scale Lattice-Boltzmann Simulations." In Lecture Notes in Computer Science, 48–57. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53862-4_5.

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Agne, M., U. Schiessl, A. Lambrecht, and M. Tacke. "Measurements of IV-VI Diode Laser Near- and Farfield Distributions." In Monitoring of Gaseous Pollutants by Tunable Diode Lasers, 93–101. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2763-9_11.

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Maisch, Steffen, Philipp Schau, Karsten Frenner, and Wolfgang Osten. "About the feasibility of nearfield-farfield transformers based on optical metamaterials." In Fringe 2009, 1–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03051-2_62.

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Hazra, Lakshminarayan, and Pubali Mukherjee. "Self-similarity in Transverse Intensity Distributions on the Farfield Plane of Self-similar Walsh Filters." In Self-similarity in Walsh Functions and in the Farfield Diffraction Patterns of Radial Walsh Filters, 47–58. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-2809-0_4.

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Hazra, Lakshminarayan, and Pubali Mukherjee. "Computation of Farfield Diffraction Characteristics of Radial and Annular Walsh Filters on the Pupil of Axisymmetric Imaging Systems." In Self-similarity in Walsh Functions and in the Farfield Diffraction Patterns of Radial Walsh Filters, 25–46. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-2809-0_3.

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Hazra, Lakshminarayan, and Pubali Mukherjee. "Walsh Functions." In Self-similarity in Walsh Functions and in the Farfield Diffraction Patterns of Radial Walsh Filters, 1–15. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-2809-0_1.

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Hazra, Lakshminarayan, and Pubali Mukherjee. "Self-similarity in Walsh Functions." In Self-similarity in Walsh Functions and in the Farfield Diffraction Patterns of Radial Walsh Filters, 17–24. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-2809-0_2.

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Hazra, Lakshminarayan, and Pubali Mukherjee. "Self-similarity in Axial Intensity Distributions of Self-similar Walsh Filters." In Self-similarity in Walsh Functions and in the Farfield Diffraction Patterns of Radial Walsh Filters, 59–71. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-2809-0_5.

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Hazra, Lakshminarayan, and Pubali Mukherjee. "Self-similarity in 3D Light Distributions Near the Focus of Self-similar Radial Walsh Filters." In Self-similarity in Walsh Functions and in the Farfield Diffraction Patterns of Radial Walsh Filters, 73–80. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-2809-0_6.

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Conference papers on the topic "Farfield"

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Guerin, Sebastien. "Farfield Radiation of Induct-Cutoff Pressure Waves." In 23rd AIAA/CEAS Aeroacoustics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-4037.

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Cai, Chunpei. "Highly rarefied jet flow farfield density properties." In PROCEEDINGS OF THE 29TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4902643.

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SINI, M. "RECONSTRUCTION OF COMPLEX CRACKS BY FARFIELD MEASUREMENTS." In Proceedings of the 8th International Workshop on Mathematical Methods in Scattering Theory and Biomedical Engineering. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812814852_0009.

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Allmaras, Steven, V. Venkatakrishnan, and Forrester Johnson. "Farfield Boundary Conditions for 2-D Airfoils." In 17th AIAA Computational Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-4711.

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Campobasso, M. Sergio, Mohammad H. Baba-Ahmadi, and Grant McLelland. "Ad-Hoc Boundary Conditions for CFD Analyses of Turbomachinery Problems With Strong Radial Flow Gradients at Farfield Boundaries." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22176.

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This paper reports on the improvements of flux enforcement and auxiliary state farfield boundary conditions for Euler and Navier-Stokes Computational Fluid Dynamics codes. The new conditions are based on 1D characteristic data and also on the introduction in the boundary conditions of certain numerical features of the numerical scheme used for the interior of the domain. In the presence of strong radial gradients of the flow field at the farfield boundaries, the new conditions perform significantly better than their conventional counterparts, in that they a) preserve the order of the space-discretization, and b) greatly reduce the error in estimating integral output. A coarse-grid CFD analysis of the compressible flow field in an annular duct for which an analytical solution is available yields a mass flow error of 62% or 2%, depending on whether the best or the worst farfield BC implementation is used. The presented BC enhancements can be applied to structured, unstructured, cell-centered and cell-vertex solvers.
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Boyle, Devin K., Brenda S. Henderson, and Lennart S. Hultgren. "DGEN Aeropropulsion Research Turbofan Core/Combustor-Noise Measurements: Experiment and Modal Structure at Core-Nozzle Exit." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14194.

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Abstract Data from a recent core/combustor-noise source-diagnostic test utilizing a small turbofan engine are analyzed. The campaign continued the exploration begun in a baseline test, but with more extensive acoustic instrumentation. Both tests were aimed at developing a better understanding of propulsion-noise sources and their impact on the farfield noise signature, in order to enable improved turbofan noise-prediction methods and noise-mitigation techniques. Simultaneous high-data-rate acoustic measurements (93 channels in total) were obtained using a circumferential sensor array at the core-nozzle exit in conjunction with sideline and farfield microphone arrays for several relevant engine operational points. Measurements were repeated for different circumferential and sideline array configurations, as well as for redundancy. The unsteady pressure field at the core-nozzle exit is documented in detail. Previous work suggested that the ±1 azimuthal duct mode could be cut-on at this location, which would have implications for combustor-noise modeling and prediction. The modal decomposition of the combustor noise at the core-nozzle exit verifies this observation. Select farfield sound-pressure-level spectra are also presented.
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Dobrzynski, W., and M. Pott-Pollenske. "Slat noise source studies for farfield noise prediction." In 7th AIAA/CEAS Aeroacoustics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2001. http://dx.doi.org/10.2514/6.2001-2158.

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8

VanGilder, Douglas, Chris Chartrand, John Papp, Richard Wilmoth, and Neeraj Sinha. "Computational Modeling of Nearfield to Farfield Plume Expansion." In 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-5704.

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9

Ning, Yongqiang, Xin Gao, Lijun Wang, Peter M. Smowton, and Peter Blood. "Farfield characteristics of InGaAs/GaAs quantum dot laser." In International Symposium on Optoelectonics and Microelectronics, edited by David Chen, Ray T. Chen, Guo-Yu Wang, and Chang-Chang Zhu. SPIE, 2001. http://dx.doi.org/10.1117/12.445712.

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10

Yang, Chi, Rainald Lohner, and Francis Noblesse. "Farfield extension of fully nonlinear nearfield ship waves." In 37th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-548.

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Reports on the topic "Farfield"

1

Author, Not Given. (Fracture of ceramics under farfield cyclic compression). Office of Scientific and Technical Information (OSTI), January 1990. http://dx.doi.org/10.2172/6430068.

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