Relevant bibliographies by topics / Distortion performance

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Distortion performance'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Distortion performance"

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Carvalho, Cesar Augusto Belchior, Genaro Mariniello da Silva, Bruna Cardoso Paz, Sylvain Barraud, Maud Vinet, Olivier Faynot, and Marcelo Antonio Pavanello. "Performance and Analysis of n-Type Vertically Stacked Nanowires Regarding Harmonic Distortion." Journal of Integrated Circuits and Systems 15, no. 2 (August 11, 2020): 1–5. http://dx.doi.org/10.29292/jics.v15i2.202.

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This paper studies the harmonic distortion (or non-linearity) of vertically stacked SOI nanosheets with different fin widths and channel lengths. The total harmonic distortion and third order harmonic distortion are used as figures of merit in this work. The four approaches applied verifies the correlation between the harmonic distortions and the variety of transistor’s dimensions available for analysis.
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Ariga, I., S. Masuda, and A. Ookita. "Inducer Stall in a Centrifugal Compressor With Inlet Distortion." Journal of Turbomachinery 109, no. 1 (January 1, 1987): 27–35. http://dx.doi.org/10.1115/1.3262066.

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The effects of inlet distortion on the inducer stall in a centrifugal compressor are investigated. Cases of both radial and circumferential distortion are investigated. It is shown that the rotating stall onset is amplified by radial distortions, and restrained by circumferential distortions. These results are compared with calculations based on the small disturbance theory. The authors find that the stall onset is governed by the characteristic parameters related to the lower flow rate region for radial distortions, but affected by those of the higher flow rate region for circumferential distortion. It is shown that the process of stall is different for each distortion pattern. Existence of inlet distortion reduces compressor performance characteristics and strongly influences the stability margin.
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Pazur, W., and L. Fottner. "The Influence of Inlet Swirl Distortions on the Performance of a Jet Propulsion Two-Stage Axial Compressor." Journal of Turbomachinery 113, no. 2 (April 1, 1991): 233–40. http://dx.doi.org/10.1115/1.2929091.

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Aeroengine intakes containing S-shaped diffusers produce different types of inlet swirl distortions and essentially a combination of a twin swirl and a bulk swirl. The main object of this investigation was to assess the influence of inlet swirl distortions on the performance of a transonic two-stage axial compressor installed in a turbo jet bypass engine Larzac 04. A typical inlet swirl distortion was simulated by a delta-wing in front of the engine. An experimental method was investigated to measure the performance map of the installed low-pressure compressor for different engine operating lines. The influence of an inlet swirl distortion with different strengths on the performance map of the compressor was investigated experimentally. It is shown that the performance parameters decrease and a temperature distortion is generated behind the compressor. As the basis of the theoretical investigations of the performance map, including inlet swirl distortions, a computing model considering four compressors working in parallel was established. The model is based on the idea that an inlet swirl distortion can be substituted by two fundamental types of swirl components, i.e., a bulk swirl corotating, and a bulk swirl counterrotating to the revolution of the compressor. Computed performance maps of the compressor will be discussed and compared with the experimental data.
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Ayub, Munirah, Chin Kim Gan, and Aida Fazliana Abdul Kadir. "Harmonic Performance of Grid-Connected PV System under Various Penetration Levels." Applied Mechanics and Materials 699 (November 2014): 486–91. http://dx.doi.org/10.4028/www.scientific.net/amm.699.486.

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This paper studies the harmonic performance of grid-connected PV system under various penetration levels. The system under study was modelled in MATLAB/Simulink environment. Current and voltage distortions were studied in terms of the percentage of Total Harmonic Distortion (THD) under different PV penetration scenarios. The results showed that the Grid-Connected PV generates a different level of harmonics distortion depending on the PV penetration level that was injected to the grid.
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Narayanan, Ram, Kyle Gallagher, Gregory Mazzaro, Anthony Martone, and Kelly Sherbondy. "Hardware Design of a High Dynamic Range Radio Frequency (RF) Harmonic Measurement System." Instruments 2, no. 3 (August 19, 2018): 16. http://dx.doi.org/10.3390/instruments2030016.

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Radio frequency (RF) circuit elements that are traditionally considered to be linear frequently exhibit nonlinear properties that affect the intended operation of many other RF systems. Devices such as RF connectors, antennas, attenuators, resistors, and dissimilar metal junctions generate nonlinear distortion that degrades primary RF system performance. The communications industry is greatly affected by these unintended and unexpected nonlinear distortions. The high transmit power and tight channel spacing of the communication channel makes communications very susceptible to nonlinear distortion. To minimize nonlinear distortion in RF systems, specialized circuits are required to measure the low level nonlinear distortions created from traditionally linear devices, i.e., connectors, cables, antennas, etc. Measuring the low-level nonlinear distortion is a difficult problem. The measurement system requires the use of high power probe signals and the capability to measure very weak nonlinear distortions. Measuring the weak nonlinear distortion becomes increasingly difficult in the presence of higher power probe signals, as the high power probe signal generates distortion products in the measurement system. This paper describes a circuit design architecture that achieves 175 dB of dynamic range which can be used to measure low level harmonic distortion from various passive RF circuit elements.
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Verma, Vishwas, Gursharanjit Singh, and AM Pradeep. "The effect of inlet distortion on low bypass ratio turbofan engines." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 234, no. 8 (March 2, 2020): 1395–413. http://dx.doi.org/10.1177/0954410020909190.

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Inlet flow non-uniformity, commonly known as inflow distortion, has been a long-standing problem in the history of gas turbine engines. Distortion can be present in the form of total pressure, total temperature or inflow incidence or any combinations of these. The search for better and robust performance requires engines that can sustain a large amount of inlet distortion without considerable loss in the thrust. In the present paper, the effect of total pressure distortion on a single-stage compressor and low bypass ratio fans are studied. Distortion near hub and tip in the form of step radial total pressure profiles is imposed at far upstream of the rotor leading edge. A systematic approach to qualitatively predict the performance maps in the presence of these distortions is discussed. Further, two extents of total pressure distortion are explored for constant inlet distortion intensity. Hub distortion is found to increase the stability margin, whereas tip distortion reduces it. On extending the distortion extent, hub distortion drastically reduces the stability margin, whereas a comparatively lower reduction in stability margin with tip distortion is observed. The critical distortion limit is observed by varying the inlet distortion extent. Also, it is found that downstream ducts in the bypass axial fan do not interact with the upstream fan. This can be exploited to perform independent simulations of the core engine from low bypass ratio fans. Hub distortion is found to drastically affect the duct performance owing to the presence of thicker upstream inlet boundary layer.
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Huan, S. L., and A. R. Pater. "Analysis and prediction of geophone performance parameters." GEOPHYSICS 50, no. 8 (August 1985): 1221–28. http://dx.doi.org/10.1190/1.1441994.

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In the past, designers relied greatly on simplified geophone models to describe the physical quantities of a geophone. Several iterations of fine tuning the geophone variables were required to achieve a desired geophone characteristic. Although many geophone prototypes were built before a geophone design was finalized, it was still impossible to assure an optimum geophone design. An easier, faster, and more accurate method of predicting geophone parameters is described and the method of computer‐aided geophone design is outlined. A description of a nonlinear geophone model is presented and a numerical method to compute the nonlinear magnetic flux density distribution is outlined. An integration algorithm is used to compute the geophone sensitivity and open‐circuit damping. The measurement of geophone distortion is described, and the harmonic distortion due to nonlinearity of sensitivity and damping is computed. The data of a geophone spring constant were obtained through a recent experiment, and the harmonic distortions caused by the nonlinearity of the spring are computed. Finally, the total harmonic distortion of a geophone is obtained. Programs developed to predict geophone sensitivity, damping, and distortion are described. It is shown that the method used to compute the nonlinear flux density distribution converges properly and the results obtained are meaningful. Three different types of geophones are analyzed and a comparison between the simulated and measured data is made. In all three cases, good correlation exists between the parameters predicted and the parameters actually measured. Information obtained by geophone parameter prediction can be very useful in the geophone design process, in optimizing geophones, and in achieving higher performance levels.
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Mistry, Chetan, and A. M. Pradeep. "Experimental Study of the Effect of Radially Distorted Inflow on a Contrarotating Fan Stage." International Journal of Rotating Machinery 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/503579.

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The paper reports results of a detailed study of hub- and tip-strong radial inflow distortion on the performance of a low speed, high aspect ratio (3.0) contrarotating fan stage. The distortion screen (placed upstream of the first rotor) covers 1/3 of the span of the blade near the hub and the casing for hub-strong and tip-strong inflow distortions, respectively. The performance of the contrarotating fan was investigated under both the radially distorted inflows and compared with the clean inflow conditions under different speed combinations of rotor-1 and rotor-2. The hub-strong radial distortion reduces the overall performance (pressure rise and efficiency) as well as the operating range by about 2 to 4% under the different speed combinations. On the other hand, it is interesting to observe that the tip covered radial distortion not only improves the pressure rise, but also increases the overall operating range by about 6 to 8%. There was, however, a 6 to 8% decrease in efficiency in this case as compared to 12 to 15% for hub-strong radial inflow distortion. The results reveal the physics of the effects of radial inflow distortion on the overall performance of the contrarotating fan stage.
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Chen, Xiaohong, Qian Sun, and Jun Hu. "Generation of Complete SAR Geometric Distortion Maps Based on DEM and Neighbor Gradient Algorithm." Applied Sciences 8, no. 11 (November 9, 2018): 2206. http://dx.doi.org/10.3390/app8112206.

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Radar-specific imaging geometric distortions (including foreshortening, layover, and shadow) that occur in synthetic aperture radar (SAR) images acquired over mountainous areas have a negative impact on the suitability of the interferometric SAR (InSAR) technique to monitor landslides. To address this issue, many distortion simulation methods have been presented to predict the areas in which distortions will occur before processing the SAR image. However, the layover and shadow regions are constituted by active as well as passive subregions. Since passive distortions are caused by active distortions and can occur in the flat area, it is difficult to distinguish the transition zone between passive distortion and non-distortion areas. In addition, passive distortion could cover part of the foreshortening or active layover/shadow areas but has generally been ignored. Therefore, failure to simulate passive distortion leads to incomplete simulated distortions. In this paper, an algorithm to define complete SAR geometric distortions and correct the boundaries among different distortions is presented based on the neighbor gradient between the passive and active distortions. It is an image-processing routine applied to a digital elevation model (DEM) of the terrain to be imaged by the available SAR data. The performance of the proposed method has been validated by the ascending and descending Advanced Land Observing Satellite (ALOS) Phased Array type L-band Synthetic Aperture Radar (PALSAR) images acquired over the Chongqing mountainous area of China. Through the investigation of passive distortion, we can have a deeper understanding of the formation and characteristics of these distortions. Moreover, it provides very meaningful information for research on areas such as landslide monitoring.
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EBERLEIN, ERNST, and DILIP B. MADAN. "HEDGE FUND PERFORMANCE: SOURCES AND MEASURES." International Journal of Theoretical and Applied Finance 12, no. 03 (May 2009): 267–82. http://dx.doi.org/10.1142/s0219024909005282.

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The concept of the gamma of a financed return as the highest level of stress that a return distribution can withstand is introduced. Stress is measured by positive expectation under a concave distortion of the return distribution accessed. Four distortions introduced in Cherny and Madan (2008) are employed in studying the distribution of returns available in the hedge fund universe. It is shown that the skewness, peakedness and tailweightedness of the standardized investment return significantly affects the Sharpe ratios required to reach a target gamma level.
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Dissertations / Theses on the topic "Distortion performance"

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Mbabele, Modeste. "Intermodulation distortion performance enhancement of microwave power amplifiers." Thesis, Brunel University, 2000. http://bura.brunel.ac.uk/handle/2438/5440.

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This thesis reports the author's investigation of the effects of the injection of specific signals on the intermodulation distortion performance of microwave power amplifiers. Theory, simulation and practical results are presented, analysed and compared. The thesis gives the reader background knowledge of power amplifiers and their nonlinearities and go on to analyse the phenomena of intermodulation distortion product generation in power amplifiers. The analysis is based on a three-tone test since this highlights a second kind of third order intermodulation distortion (IMD3), which are in general higher in amplitude than the first kind of IMD3 found in a two-tone test. A mathematical analysis and a simulation of a MESFET amplifier are performed. It enables the comparison of the performance of IMD cancellation by injection of signals whose frequencies are chosen to be first, the second harmonic of the fundamental signals, second, the sum of the fundamental signal frequencies and finally the difference frequencies of the fundamental signals. A practical implementation of the difference frequency technique is then presented and practical results are compared to the other two techniques of second harmonic injection and the injection of the sum of fundamental frequencies. It is further shown that in practise these two techniques may be considered as a single technique.
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Papamarkos, Ioannis. "Inlet distortion generation for a transonic compressor." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Sep%5FPapamarkos.pdf.

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Lucas, James Redmond. "Effect of BLI-Type Inlet Distortion on Turbofan Engine Performance." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23272.

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Boundary Layer Ingestion (BLI) is currently being researched as a potential method to improve efficiency and decrease emissions for the next generation of commercial aircraft.  While re-energizing the boundary layer formed over the fuselage of an aircraft has many system level benefits, ingesting the low velocity boundary layer flow through a serpentine inlet into a turbofan engine adversely affects the performance of the engine.  The available literature has only yielded studies of the effects of this specific type of inlet distortion on engine performance in the form of numerical simulations.  This work seeks to provide an experimental analysis of the effects of BLI-type distortion on a turbofan engine\'s performance.  A modified JT15D-1 turbofan engine was investigated in this study.  Inlet flow distortion was created by a layered wire mesh distortion screen designed to create a total pressure distortion profile at the aerodynamic interface plane (AIP) similar to NASA\'s Inlet A boundary layer ingesting inlet flow profile.  Results of this investigation showed a 15.5% decrease in stream thrust and a 14% increase in TSFC in the presence of BLI-type distortion.  

Flow measurements at the AIP and the bypass nozzle exit plane provided information about the losses throughout the fan flow path.  The presence of the distortion screen resulted in a 24% increase in mass-averaged entropy production along the entire fan flow path compared to the non-distorted test.  A mass-averaged fan flow path efficiency was also calculated assuming an isentropic process as ideal.  The non-distorted fan flow path efficiency was computed to be 60%, while the distorted fan flow path efficiency was computed to be 50.5%, a reduction in efficiency of 9.5%.  The entropy generation between ambient conditions and the AIP was compared to the entropy production along the entire fan flow path.  It was found that the majority of entropy generation occurred between the AIP and bypass nozzle exit.  Based on flow measurements at the bypass nozzle exit plane, it was concluded that inlet flow distortion should be located away from the tip region of the fan in order to minimize losses in a very lossy region.  It was also determined that the fan and bypass duct process the different regions of the total pressure distortion in different ways.  In some regions the entropy production decreased for the distorted test compared to the clean test, while in other regions the entropy production increased for the distorted test compared to the clean test.  Finally, it was found that small improvements in total pressure and total temperature variation at the bypass nozzle exit plane will greatly improve the fan flow path efficiency and entropy generation, thereby decreasing performance losses.

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McGuinness, Christopher. "Characterizing Remote Sensing Data Compression Distortion for Improved Automated Exploitation Performance." University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1524844209730534.

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MacLeod, Brenda Brennan 1971. "Effect of a sinusoidal three-lobe total pressure distortion on a transonic compressor : distortion propagation, compressor performance, and blade passage events." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/82772.

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O'Brien, Daniel Gerard, and n/a. "Broadband matching and distortion performance relating to multiple subcarrier multiplexed photonic systems." University of Canberra. Information Sciences & Engineering, 1992. http://erl.canberra.edu.au./public/adt-AUC20060821.095055.

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This thesis describes the outcome of study to investigate methods of broadband matching to photonic devices such as lasers and high speed detectors. The thesis is divided into two areas of interest relating to the design of broadband fiber optic links. The first area is the application of numerical methods and commensurate line methods to the design of compact equalisers which allow an improved transducer power gain over a wide band. It is shown that physically small equalisers can yield an improvement of 4 dB over a 2 GHz bandwidth. The second area considered is the distortion inherent in a laser diode. Detailed measurements of the second order and intermodulation products are given. A small signal perturbation analysis is presented which helps to explain the observed distortion products. The results of numerical simulation of the distortion using a state variable implementation of the full rate equations and related first, second and intermodulation equations is presented and possible methods of reducing the distortion are explored. It is shown that in principle the distortion could be reduced by pre-generating the distortion and adding an inverted form of the distortion to the transmitted signal. The distortion can then be corrected in the fiber and simulation studies suggest that an improvement of 13 dB optical or 26 dB electrical may be possible.
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Firm, Richard. "Mechanical distortion and performance associated with cylindrical components in diesel injector systems." Thesis, University of Bath, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392055.

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As European and US vehicle emissions regulations tighten, more effective methods of reducing diesel engines pollutants must be devised. Increasing the injection pressure results in smaller fuel droplets and consequently more efficient combustion with a reduction in emissions output. However, to gain acceptable levels of NO. and particulates, required pressures must be of the order of 1800 to 2400 bar. At this level the components within the diesel injector and pump experience an appreciable level of distortion, that can, in severe cases, lead to leakage and a loss in pumping efficiency. It is therefore critical that an accurate means of determining the distortion and associated leakage is established. An efficient analytical method of solution for the problem of mechanical distortion of a diesel pump is presented. Both the EUI (Electronic Unit Injector) and CR (Common Rail) injection systems use essentially in-line pumps for which this technique allows the individual components (principally the plunger and barrel) to be analysed. Also, combined fluid-elastic systems are considered in both CR and EUI cases. An elastic integral equation formulation is optimised for a cylindrical geometry and this is used to evaluate key features of the system such as pressure distributions and variations in film thickness during the pumping stroke. It is then straightforward to evaluate other parameters such as leakage and both magnitude and direction of fluid flow within the film thickness. Simplification of elastic models is not required and as such this thesis also considers the effect of ports on the fluid flow and pressure distribution and also the relative orientation and axial position of the plunger within the barrel. This allows a detailed description and explanation to be made of the behaviour of the diesel pump. A key advantage of the method is that the fluid and elastic solvers may be decoupled and developed separately. This provides a means of extending the scope of the method beyond that presented here.
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Smurzynski, Jacek. "Frequency Modulated Distortion-product Otoacoustic Emission (FMDPOAE) Tests Aimed for Improving Diagnostic Performance." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etsu-works/2220.

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Guerreiro, João Francisco Martinho Lêdo. "Maximum likelihood detection for OFDM signals with strong nonlinear distortion effects." Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/7983.

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Häger, Emil. "Performance Evaluation of Medium-Power Voltage Inverters." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-118568.

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Power inverters, used to convert DC power to AC, are often used in e.g. solar power applications. However, they tend to be impractically large and expensive; as such, power miniaturization is an active research area. In this thesis, several classes of modern power inverters are evaluated and compared with regards to size, efficiency and output quality in order to identify areas of potential improvement. Methods for estimation of THD, power losses and input ripple are created and verified against a simulation of a five-level neutral-point-clamped inverter with SPWM control. Finally, this design is implemented physically and is found to achieve 94.5% efficiency and 7% THD under low voltage laboratory conditions, while remaining smaller than an average textbook.
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Books on the topic "Distortion performance"

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Laug, O. B. Electrical performance tests for audio distortion analyzers. Gaithersburg, Md: U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Living in a world transformed: Perceptual and performatory adaptation to visual distortion. Caldwell, N.J: Blackburn Press, 2005.

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Townsend, Robert Frederick. Policy distortions & agricultural performance in the South African economy. Halfway House, South Africa: Development Bank of Southern Africa, Development Information Business Unit, 1997.

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Daneshmandi, Mohsen. Computer aided analysis of the distortional behaviour of the combined system of a radial arm drilling machineand twist drill and its effect on drilling performance. (s.l: The Author), 1986.

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Pestieau, Pierre, and Mathieu Lefebvre. Welfare State and Economic Efficiency. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198817055.003.0007.

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The main purpose of this chapter is to tackle the issue of whether or not the welfare state is responsible for the decline in economic performance. At the micro level, social protection brings distortion in the choices of contributors and of beneficiaries. Yet, the empirical evidence indicates that the cost of these distortions is rather limited. At the macro level, one cannot infer much from a negative relation between the social burden and GDP growth. Given that, we reach three conclusions. First, the welfare state is likely to have modified the preferences of individuals. Second, the decline in economic growth and pressured public finance calls for its partial retrenchment. Finally, most of the work on the effect of the welfare state on growth and employment deals with a relatively short and recent period. A longer run view might be useful.
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J, Kerczewski Robert, and United States. National Aeronautics and Space Administration., eds. Effects of amplitude distortions and IF equalization on satellite communication system bit-error rate performance. [Washington, DC]: National Aeronautics and Space Administration, 1990.

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Barr, David L. Narrative Technique in the Book of Revelation. Edited by Danna Nolan Fewell. Oxford University Press, 2015. http://dx.doi.org/10.1093/oxfordhb/9780199967728.013.32.

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The book of Revelation is neither a guide to the end of the world nor a handbook of theology. It is a narrative in which John recounts what happened to him on Patmos, describes what he saw and heard when he ascended into the sky/heaven, and recounts the cosmic conflict between the forces of good and evil—an ultimate Holy War. It is thus a complicated narrative, recounting both John’s actions (what happened to him) and the actions he recounts in the stories he tells (what he saw and heard). He functions as both the narrator and as a character in the story. This article explores various techniques used to tell the story, including its genre, structure and plot, temporal and spatial distortions, narrative performance and characterizations, and narrative rhetoric.
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Smith, Christopher J. Akimbo Culture. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252037764.003.0006.

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This chapter examines the physical and participatory implications of blackface dance, and the dance cultures more generally, depicted by William Sidney Mount. It also uses the evidence drawn from Mount's visual depictions to locate prototypical blackface dance vocabularies and rhythmic practices in vernacular art works of the earlier nineteenth century. The chapter first considers the resources for recovering the kinesics of minstrelsy, along with visible evidence of Afro-Caribbean influence on bodily kinesics, before turning to juba and the aesthetics of African movement. It then analyzes Mount's choreological evidence to illustrate the consistency with which he records and manipulates the cultural associations of body vocabulary, as well as his integration of the creole synthesis in his works. It argues that it was rhythm and dance that accounts for minstrelsy's remarkably immediate yet enduring popularity and influence. It shows that, in addition to the symbolic transgression of bourgeois grace implicit in Jim Crow's akimbo representation, the images' anatomical distortions also capture movement, not stasis. The chapter concludes by looking at the so-called “bending knee-bone” in blackface performance.
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Book chapters on the topic "Distortion performance"

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Silva-Martínez, José, Michiel Steyaert, and Willy Sansen. "Very Low-Distortion Operational Transconductance Amplifiers for High-Frequency Applications." In High-Performance CMOS Continuous-Time Filters, 15–66. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4757-2224-6_2.

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Veena, S. K., and K. Mahesh Rao. "Performance Evaluation of Joint Rate-Distortion Model of Video Codec." In Intelligent Algorithms in Software Engineering, 63–72. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51965-0_6.

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Kharin, Alexey. "Performance of Sequential Tests for Random Data Monitoring Under Distortion." In Communications in Computer and Information Science, 280–88. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-35430-5_23.

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Bhowmik, Deepayan, and Charith Abhayaratne. "A Generalised Model for Distortion Performance Analysis of Wavelet Based Watermarking." In Digital Watermarking, 363–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-04438-0_31.

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Ali, Ahmed, Bhekisipho Twala, Tshilidzi Marwala, and Ilyes Boulkaibet. "Total Harmonic Distortion Performance in PV Systems Using Fuzzy Logic Controller." In Advanced Control Engineering Methods in Electrical Engineering Systems, 328–37. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97816-1_25.

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Gadermayr, Michael, Andreas Uhl, and Andreas Vécsei. "The Effect of Endoscopic Lens Distortion Correction on Physicians’ Diagnosis Performance." In Informatik aktuell, 174–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54111-7_35.

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Patidar, Pawan Kumar, and Mukesh Kataria. "Image Enhancement Performance of Fuzzy Filter and Wiener Filter for Statistical Distortion." In Algorithms for Intelligent Systems, 583–94. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4936-6_63.

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Ruf, Michael J., and James W. Modestino. "Rate-Distortion Performance of Several Joint Source and Channel Coding Schemes for Images." In Information Technology: Transmission, Processing and Storage, 85–99. London: Springer London, 1996. http://dx.doi.org/10.1007/978-1-4471-1013-2_7.

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Ali, Ahmed, Bhekisipho Twala, Tshilidzi Marwala, and Ilyes Boulkaibet. "Correction to: Total Harmonic Distortion Performance in PV Systems Using Fuzzy Logic Controller." In Advanced Control Engineering Methods in Electrical Engineering Systems, E1. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97816-1_45.

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Zhang, Bohan, Qiang Wang, Haiyang Hu, and Yahua Zhang. "The Simulation of Compressor Performance of Inlet Distortion Using Split Actuator Disk Model." In Lecture Notes in Electrical Engineering, 280–93. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-3305-7_23.

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Conference papers on the topic "Distortion performance"

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Defoe, J. J., and D. K. Hall. "Fan Performance Scaling With Inlet Distortions." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-58009.

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Applications such as boundary-layer-ingesting fans, and compressors in turboprop engines require continuous operation with distorted inflow. A low-speed axial fan with incompressible flow is studied in this paper. Previous work in the literature has shown that the same flow mechanisms contributing to the response of a fan to distortion are at play in incompressible and transonic flows. The objective is to determine how fan performance scales as the type and severity of inlet distortion varies at the design flow coefficient. A distributed source term approach to modeling the rotor and stator blade rows is used in numerical simulations in this paper. The approach has been shown to capture overall stage performance and flow field behavior with distortions having length scales much longer than the blade pitch. The approach requires only knowledge of the blade geometry, but the model does not include viscous losses. As a result, efficiency is not assessed but instead a metric based on changes in diffusion factor is defined which is conjectured to be related to efficiency changes. Distortions in stagnation pressure, swirl, and stagnation temperature are considered. By studying the distortions individually, it is found that the diffusion metric scales linearly with the intensity of the distortions (i.e. the ratio of minimum to maximum values) but that changes in distortion location relative to the fan axis produce nonlinear changes in the diffusion metric. Combinations of distortions are also studied and it is found that the diffusion metric associated with the combined distortion can be predicted using a summation procedure for the metrics associated with the individual constituent distortions. The mechanism found to govern the effectiveness of this summation procedure is the incidence distortions at rotor and stator inlet.
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Sheoran, Yogi, Bruce Bouldin, and P. Murali Krishnan. "Compressor Performance and Operability in Swirl Distortion." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22777.

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Inlet swirl distortion has become a major area of concern in the gas turbine engine community. Gas turbine engines are increasingly installed with more complicated and tortuous inlet systems, like those found on embedded installations on Unmanned Aerial Vehicles (UAVs). These inlet systems can produce complex swirl patterns in addition to total pressure distortion. The effect of swirl distortion on engine or compressor performance and operability must be evaluated. The gas turbine community is developing methodologies to measure and characterize swirl distortion. There is a strong need to develop a database containing the impact of a range of swirl distortion patterns on a compressor performance and operability. A recent paper presented by the authors described a versatile swirl distortion generator system that produced a wide range of swirl distortion patterns of a prescribed strength, including bulk swirl, twin swirl and offset swirl. The design of these swirl generators greatly improved the understanding of the formation of swirl. The next step of this process is to understand the effect of swirl on compressor performance. A previously published paper by the authors used parallel compressor analysis to map out different speed lines that resulted from different types of swirl distortion. For the study described in this paper, a computational fluid dynamics (CFD) model is used to couple upstream swirl generator geometry to a single stage of an axial compressor in order to generate a family of compressor speed lines. The complex geometry of the analyzed swirl generators requires that the full 360° compressor be included in the CFD model. A full compressor can be modeled several ways in a CFD analysis, including sliding mesh and frozen rotor techniques. For a single operating condition, a study was conducted using both of these techniques to determine the best method given the large size of the CFD model and the number of data points that needed to be run to generate speed lines. This study compared the CFD results for the undistorted compressor at 100% speed to comparable test data. Results of this study indicated that the frozen rotor approach provided just as accurate results as the sliding mesh but with a greatly reduced cycle time. Once the CFD approach was calibrated, the same techniques were used to determine compressor performance and operability when a full range of swirl distortion patterns were generated by upstream swirl generators. The compressor speed line shift due to co-rotating and counter-rotating bulk swirl resulted in a predictable performance and operability shift. Of particular importance is the compressor performance and operability resulting from an exposure to a set of paired swirl distortions. The CFD generated speed lines follow similar trends to those produced by parallel compressor analysis.
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Pazur, Wolfram, and Leonhard Fottner. "The Influence of Inlet Swirl Distortions on the Performance of a Jet Propulsion Two-Stage Axial Compressor." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-147.

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Aeroengine intakes containing S-shaped diffusers produce different types of inlet swirl distortions and essentially a combination of a twin swirl and a bulk swirl. The main object of this investigation was to assess the influence of inlet swirl distortions on the performance of a transonic two-stage axial compressor installed in a turbo jet bypass engine Larzac 04. A typical inlet swirl distortion was simulated by a delta-wing in front of the engine. An experimental method was investigated to measure the performance map of the installed low pressure compressor for different engine operating lines. The influence of an inlet swirl distortion with different strengths on the performance map of the compressor was investigated experimentally. It is shown that the performance parameters decrease and a temperature distortion is generated behind the compressor. As the basis of the theoretical investigations of the performance map including inlet swirl distortions a computing model considering four compressors working in parallel was established. The model is based on the idea that an inlet swirl distortion can be substituted by two fundamental types of swirl components, i.e. a bulk swirl co-rotating, and a bulk swirl counter-rotating to the revolution of the compressor. Computed performance maps of the compressor will be discussed and compared with the experimental data.
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Naseri, A., M. Boroomand, A. M. Tousi, and A. R. Alihosseini. "The Effect of Inlet Flow Distortion on Performance of a Micro-Jet Engine: Part 2 — Engine Tests." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86803.

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This paper concerns investigating effect of inlet flow distortion on performance of a micro-jet engine. An experimental study has been carried out to determine how the steady state inlet total-pressure distortion affects the performance of a micro gas turbine engine. An inlet simulator is designed and developed to produce and measure distortion patterns at the engine inlet. An Air Jet Distortion Generator is used to produce non-uniform flow patterns and total pressure probes are implemented to measure steady state total pressure distribution at the engine face. A set of wind tunnel tests has been performed to confirm the fidelity of distortion generator and measuring devices. The engine got exposed to inlet flow with 60-degree, 120-degree, and 180-degree circumferential distortion patterns with different distortion intensities and the engine performance have been measured and compared with that of clean inlet flow. Results indicate that engine performance can be affected significantly facing with intense inlet distortions.
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Kim, A. N., and T. A. Ramstad. "Improving the rate-distortion performance of DPCM." In Seventh International Symposium on Signal Processing and Its Applications, 2003. Proceedings. IEEE, 2003. http://dx.doi.org/10.1109/isspa.2003.1224649.

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Gibson, Jerry D., and Ying-Yi Li. "Rate distortion performance bounds for wideband speech." In 2012 Information Theory and Applications Workshop (ITA). IEEE, 2012. http://dx.doi.org/10.1109/ita.2012.6181803.

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Yang, J., and Z. Zhang. "Rate-distortion performance of correlated Gaussian source." In IEEE International Symposium on Information Theory, 2003. Proceedings. IEEE, 2003. http://dx.doi.org/10.1109/isit.2003.1228157.

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Junjie Chen and Qilian Liang. "Rate Distortion Performance Analysis of Compressive Sensing." In 2011 IEEE Global Communications Conference (GLOBECOM 2011). IEEE, 2011. http://dx.doi.org/10.1109/glocom.2011.6134482.

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Bouaafia, Soulef, Randa Khemiri, and Fatma Ezahra Sayadi. "Rate-Distortion Performance Comparison: VVC vs. HEVC." In 2021 18th International Multi-Conference on Systems, Signals & Devices (SSD). IEEE, 2021. http://dx.doi.org/10.1109/ssd52085.2021.9429377.

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Beyene, Wendemagegnehu T. "Peak distortion analysis of nonlinear links." In 2013 IEEE 22nd Conference on Electrical Performance of Electronic Packaging and Systems (EPEPS). IEEE, 2013. http://dx.doi.org/10.1109/epeps.2013.6703491.

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Reports on the topic "Distortion performance"

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Laug, O. B., G. N. Stenbakken, and T. F. Leedy. Electrical performance tests for audio distortion analyzers. Gaithersburg, MD: National Bureau of Standards, 1985. http://dx.doi.org/10.6028/nbs.ir.85-3269.

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Laug, O. B. Electrical performance tests for audio distortion analyzers. Gaithersburg, MD: National Bureau of Standards, 1986. http://dx.doi.org/10.6028/nbs.tn.1219.

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