Готові списки джерел за темами / Spread of Excitation

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Добірка наукової літератури з теми "Spread of Excitation"

Автор: Grafiati
Опубліковано: 28 вересня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Spread of Excitation"

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FRANZONE, PIERO COLLI, LUCIANO GUERRI, and BRUNO TACCARDI. "Spread of Excitation in a Myocardial Volume:." Journal of Cardiovascular Electrophysiology 4, no. 2 (April 1993): 144–60. http://dx.doi.org/10.1111/j.1540-8167.1993.tb01219.x.

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Arisi, Giorgio, Bruno Taccardi, and Emilio Macchi. "Epicardial spread of excitation during ventricular pacing." Journal of Electrocardiology 25, no. 3 (July 1992): 250–51. http://dx.doi.org/10.1016/0022-0736(92)90029-y.

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3

Chen, Nan Guang, and Quing Zhu. "Time-resolved optical measurements with spread spectrum excitation." Optics Letters 27, no. 20 (October 15, 2002): 1806. http://dx.doi.org/10.1364/ol.27.001806.

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Taccardi, B., Robert Lux, Philip Ershler, Shinji Watabe, and Emilio Macchi. "Intramural spread of excitation wavefronts and associated potential fields." Journal of Electrocardiology 23, no. 3 (July 1990): 282. http://dx.doi.org/10.1016/0022-0736(90)90191-4.

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Rocha, B. M., F. O. Campos, R. M. Amorim, G. Plank, R. W. dos Santos, M. Liebmann, and G. Haase. "Accelerating cardiac excitation spread simulations using graphics processing units." Concurrency and Computation: Practice and Experience 23, no. 7 (December 7, 2010): 708–20. http://dx.doi.org/10.1002/cpe.1683.

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Pal, Suvajit, and Manas Ghosh. "Influence of Oscillatory Impurity Potential and Concurrent Gasping of Impurity Spread on Excitation Profile of Doped Quantum Dots." Journal of Materials 2013 (February 21, 2013): 1–7. http://dx.doi.org/10.1155/2013/795450.

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Excitation in quantum dots is an important phenomenon. Realizing the importance we investigate the excitation behavior of a repulsive impurity-doped quantum dot induced by simultaneous oscillations of impurity potential and spatial stretch of impurity domain. The impurity potential has been assumed to have a Gaussian nature. The ratio of two oscillations (η) has been exploited to understand the nature of excitation rate. Indeed it has been found that the said ratio could fabricate the excitation in a remarkable way. The present study also indicates attainment of stabilization in the excitation rate as soon as η surpasses a threshold value regardless of the dopant location. However, within the stabilization zone we also observe maximization in the excitation rate at some typical location of dopant incorporation. The critical analysis of pertinent impurity parameters provides important perception about the physics behind the excitation process.
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Moore, Brian C. J., and Deborah A. Vickers. "The role of spread excitation and suppression in simultaneous masking." Journal of the Acoustical Society of America 102, no. 4 (October 1997): 2284–90. http://dx.doi.org/10.1121/1.419638.

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Bingabr, Mohamed, Blas Espinoza-Varas, and Philipos C. Loizou. "Simulating the effect of spread of excitation in cochlear implants." Hearing Research 241, no. 1-2 (July 2008): 73–79. http://dx.doi.org/10.1016/j.heares.2008.04.012.

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Hughes, Michelle L., Lisa J. Stille, Jacquelyn L. Baudhuin, and Jenny L. Goehring. "ECAP spread of excitation with virtual channels and physical electrodes." Hearing Research 306 (December 2013): 93–103. http://dx.doi.org/10.1016/j.heares.2013.09.014.

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Van Dijk, P., S. Van Weert, MMJG Rikers, and RJ Stokroos. "The effect of modiolus hugging on spread of neural excitation." Cochlear Implants International 6, sup1 (September 2005): 3–5. http://dx.doi.org/10.1179/cim.2005.6.supplement-1.3.

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Більше джерел

Дисертації з теми "Spread of Excitation"

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Garny, Alan Fañch. "Advanced computer models of the origin and spread of cardiac excitation." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409793.

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Chiou, Li-Kuei. "The effect that design of the Nucleus Intracochlear Electrode Array and age of onset of hearing loss have on electrically evoked compound action potential growth and spread of excitation functions." Diss., University of Iowa, 2016. https://ir.uiowa.edu/etd/3060.

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The purpose of this study was to investigate how design changes in Cochlear Nucleus cochlear implants (CIs) (CI24M, CI24R, CI24RE and CI422) affected electrode impedance and ECAP measures, and to determine if these design changes affected post-lingually deafened adults and children with congenital hearing loss in a similar way. Results of this study showed that electrode impedance was inversely related to the area of the electrode contacts in the array: lowest for the full-banded CI24M CI and highest for adults who used the CI422 device which has the smallest electrode contacts of all four devices. The noise floor of the NRT system likely plays a significant role in the finding that CI users with older devices (the CI24M, and CI24R CIs) had higher ECAP thresholds than individuals with the CI24RE electrode array. The position of the electrode array in the cochlea was also found to have a significant effect on ECAP measures. CI users with modiolar hugging (the CI24R and CI24RE CIs) electrode arrays were found to have lower ECAP thresholds than CI users whose electrode arrays were seated more laterally in the cochlear duct (e.g. the CI24M and CI422 implants). The position of the electrode contacts relative to the modiolus of the cochlea was found to be related to slope of the ECAP growth functions. The lowest slopes were found in CI24RE users. It also had a significant impact on the width of the channel interaction function. Electrode arrays seated further from the modiolus have significantly more channel interaction than electrode arrays that hug the modiolus of the cochlea. Differences between results recorded from post-lingually deafened adults and children with congenital hearing loss were minimal. The difference only reflected on the ECAP slopes. Slopes in children with congenital hearing loss were significantly steeper than those recorded from adults. This may indicate that children with congenital hearing loss may have better neural survival than adults with acquired hearing loss. In conclusion, the results of the current study show evidence of the effects of variations in design and function of the implanted components of the Nucleus CI. Perhaps the most significant finding from the current data set is that electrode arrays located closer to the modiolus of the cochlea have lower thresholds and exhibit less channel interaction than electrode arrays that are positioned more laterally. An argument could be made that lower stimulation levels and less channel interaction may result in better outcomes and/or longer battery life. For CI candidates who do not have significant residual acoustic hearing, the CI24RE implant might be a better choice than the more recently introduced CI422 electrode array.
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Cucis, Pierre-Antoine. "Influence de l’interaction inter-électrodes sur l’intelligibilité de la parole chez les patients implantés cochléaires : importance de la stratégie de codage." Thesis, Lyon, 2021. https://tel.archives-ouvertes.fr/tel-03789606.

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Depuis la fin des années 70, l’implant cochléaire a progressivement pris sa place dans les moyens classiques de réhabilitation des surdités profondes neurosensorielles. C’est ainsi que des personnes atteintes de déficience auditive profonde, retrouvent ou acquièrent l’accès à une audition utile, améliorant dans des proportions remarquables, leur qualité de vie. Environ 1 000 personnes en bénéficient chaque année en France. Cependant de grandes disparités persistent et il existe un « spectre continu » des performances chez les patients implantés qui vont de l’échec total à la restauration d’une compréhension de la parole quasi normale. Plusieurs facteurs physiologiques et techniques permettent d’expliquer une partie de la variabilité des résultats. Dans ce travail nous nous sommes intéressés à l’effet de l’interaction bioélectrique entre les électrodes et les cellules cochléaires ainsi qu’à l’impact de la stratégie de codage du son dans la compréhension de la parole dans le bruit. Une première étude évalue de façon générale la compréhension de la parole dans le bruit en fonction de la stratégie de codage avec et sans sélection de canaux. Pour cela nous avons utilisé deux approches ; une évaluation directe avec des patients implantés cochléaires et une étude en simulation avec des sujets normoentendants. Dans les deux populations, une différence a été observée en faveur de la stratégie sans sélection des canaux. Ainsi, dans les conditions de rapport signal sur bruit les plus courantes, délivrer l’information de l’ensemble des canaux peut conduire à de meilleurs pourcentages de reconnaissance qu'une stratégie de sélection. La seconde étude introduit la problématique de l’interaction. Le but de cette étude est de mettre en relation la compréhension de la parole dans le bruit avec le réglage d’une stratégie à sélection de canaux et le phénomène d’interaction. À nouveau, nous avons mis en place un protocole en simulation avec des sujets normoentendants et un protocole avec des implantés cochléaires. D’une part, nous avons mesuré la compréhension de la parole dans le bruit en fonction du nombre de canaux sélectionnés et d’autre part nous avons évalué le degré d’interaction par une mesure de la sélectivité fréquentielle. La partie concernant les patients implantés cochléaires est toujours en cours et nous nous employons à recueillir des données chez un nombre plus élevé de sujets. La partie avec les sujets normoentendants est terminée et elle nous donne une première approche de ce que nous pouvons attendre avec les implantés. Les résultats de cette partie montrent un effet de seuil à partir duquel les performances diminuent. De plus, en faisant varier l’interaction, il a été observé une corrélation intra-sujet entre la sélectivité fréquentielle et la compréhension de la parole
Since the end of the 1970s, cochlear implants have been gradually acknowledged as a conventional method for the rehabilitation of deafness which significantly improves quality of life. Nowadays, people with profound hearing loss can recover or have access to hearing. Every year in France, approximately 1,000 people benefit from a cochlear implantation. However, great disparities persist and there is a "continuous spectrum" of performances in implanted patients, ranging from total failure to the restoration of a near-normal speech comprehension. Several physiological and technical factors help to explain some of the variability in the results. In this work we investigated the effect of the bioelectric interaction between the electrodes and the cochlear cells as well as the impact of the sound coding strategy in the understanding of speech in noise. A first study evaluates, with a general point of view, the understanding of speech in noise, function of the coding strategy with or without channel selection. We used two approaches; a direct evaluation with cochlear implant patients and a simulation study with normal-hearing subjects. In both populations, a difference was observed in favor of the strategy without channel selection. Thus, under the most common signal-to-noise ratio conditions, delivering information from all channels can lead to better recognition percentages than with a selection strategy. The second study introduces the problem of channel interaction. The aim of this study is to evaluate the understanding of speech in noise to the setting of a channel selection strategy and the phenomenon of interaction. Once again, we set up a simulation protocol with normal-hearing subjects and a protocol with cochlear implants. On one hand, we measured the understanding of speech in noise as a function of the number of selected channels, and on the other hand, we evaluated the degree of interaction by measuring frequency selectivity. The part concerning cochlear implant patients is still ongoing and we need to collect data from a larger number of subjects. The part with normal-hearing subjects is finished and it gives us a first approach of what we can expect with the implanted patients. The results of this part show a threshold effect at which performance decreases. Furthermore, by varying the interaction, an intra-subject correlation was observed between frequency selectivity and speech comprehension
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Valášek, Daniel. "Stanovení mechanických charakteristik povlaků impulsní excitační metodou." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442844.

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This diploma thesis deals with the determination of the Young’s modulus of coatings using the impulse excitation technique (IET). The theoretical part of the thesis describes Cold and Thermal Spray technology, theoretical foundations of the impulse excitation technique and models of composite materials. The experimental part of the thesis deals with the determination of the tensile modulus of copper coating created by Cold Spray technology. The impulse excitation technique has been used to measure fifteen samples with coating thickness ranging approximately from 0,4 to 2 mm. Results from this measurement were evaluated using five composite models to establish the Young’s modulus of the applied coating. The best results were achieved by using the composite model based on rule of mixtures (ROM).
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Desclaux, Anthony. "Etude expérimentale du comportement linéaire et non linéaire d’une flamme diphasique soumise à une excitation acoustique. Mise en œuvre d’une méthode de contrôle adaptative." Thesis, Toulouse, ISAE, 2020. http://depozit.isae.fr/theses/2020/2020_Desclaux_Anthony_D.pdf.

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Cette thèse de doctorat se place dans la continuité de l’effort engagé par l’ONERA sur la compréhensiondes mécanismes de stabilisation des flammes diphasiques dans les moteurs aéronautiques. Ces travauxconcernent plus particulièrement la dynamique de sprays et de flammes perturbés par des ondes acoustiques.Ils étudient le rôle de l’injection de carburant liquide sur la réponse non linéaire de flammes stabilisée à l’avald’un injecteur industriel multipoint à zone centrale pilote. Sur la base de travaux antérieurs, l’objectif premierest d’étudier l’influence de perturbations acoustiques sur le comportement de l’injection de carburant liquide.Pour cela, une première configuration expérimentale simplifiée analyse l’influence de perturbationsacoustiques sur le comportement d’un jet liquide débouchant transversalement dans un écoulement d’air.Les résultats mettent en évidence les mécanismes d’atomisation du jet ainsi que son interaction avec desperturbations acoustiques. L’étude des phénomènes de transport du brouillard de gouttes montrel’apparition d’ondes de densité de gouttes. L’influence de la taille des gouttes sur ces phénomènes estcaractérisée. Le second objectif de ces travaux est d’analyser le comportement d’une flamme diphasique(kérosène/air) en présence d’excitations acoustiques. Dans ce cas, une deuxième configurationexpérimentale est mise en œuvre. Elle reproduit de manière réaliste les phénomènes rencontrés dans leschambres de combustion. Ce travail utilise l’approche « Flame Describing Function » (FDF). Pour cela, lesfluctuations du taux de dégagement de chaleur de la flamme sont caractérisées à partir d’une méthodeoriginale basée sur la mesure simultanée de la chimiluminescence de plusieurs radicaux. Les résultats sontobtenus pour deux configurations d’injection, l’une utilisant la zone pilote seul et l’autre l’injecteur dans sonintégralité. L’analyse des FDF met en évidence des phénomènes de saturation qui limitent la réponse de laflamme. La comparaison des résultats entre les deux configurations d'injection montre que le retard entre laréponse de la flamme et les perturbations de l’écoulement est fortement influencé par le mode d’injection.L’ensemble des résultats obtenus dans ces travaux constituent une base de donnée expérimentale pourvalider des simulations LES réactives et pour fournir un modèle de description du comportement de laflamme à des codes de simulation « bas ordre »
This PhD thesis supports the effort undertaken by ONERA to understand the mechanisms of stabilizationof two-phase flames in aeronautical engines. This work concerns more particularly the dynamics of spraysand flames disturbed by acoustic waves. This work studies the role of liquid fuel injection on the non-linearresponse of stabilized flames downstream of an industrial multipoint injector with a central pilot zone. Basedon previous work, the first objective is to study the influence of acoustic disturbances on the behavior ofliquid fuel injection in the multipoint zone. The observed phenomena are reproduced, in an idealized form,from a simplified experimental set up based on the configuration of a liquid jet injected into air crossflowsubmitted to an acoustic forcing. The results highlight the atomization mechanisms of the jet and itsinteraction with acoustic disturbances. The study of the spray shows the appearance of droplet densitywaves. The influence of drop size on these phenomena is characterized. The second objective of this workis to analyze the behavior of a two-phase flame (kerosene/air) disturbed by acoustic excitations. In this case,a second experimental configuration is implemented. This experimental set up reproduces in a realistic waythe phenomena encountered in combustion chambers. This work uses the "Flame Describing Function"(FDF) approach. In order to do this, the fluctuations of the heat release rate from the flame are characterizedusing an original method based on the simultaneous measurement of the chemiluminescence of severalradicals. The results are obtained for two injection configurations, one using the pilot zone alone and theother using the entire injector. The analysis of the FDFs reveals saturation phenomena which limit the flameresponse. Comparison of the results between the two injection configurations shows that the delay betweenflame response and flow disturbances is strongly influenced by the injection mode. All the results obtainedin this work constitute an experimental database to validate reactive LES simulations and to provide a modelfor describing the flame behavior in simulations based on "low order" approaches
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Частини книг з теми "Spread of Excitation"

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Shaw, Robin, and Yoram Rudy. "Gap Junctions and the Spread of Electrical Excitation." In Developments in Cardiovascular Medicine, 125–47. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5525-4_6.

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Franzone, P. Colli, L. Guerri, and M. Pennacchio. "Simulation of the Spread of Excitation in the Myocardial Tissue." In Biomedical and Life Physics, 173–80. Wiesbaden: Vieweg+Teubner Verlag, 1996. http://dx.doi.org/10.1007/978-3-322-85017-1_16.

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Svilainis, L., A. Chaziachmetovas, D. Kybartas, and V. Eidukynas. "Data acquisition for ultrasonic transducer evaluation under spread spectrum excitation *." In Advanced Data Acquisition and Intelligent Data Processing, 83–125. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003337027-5.

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PLANK, G. "USING MONODOMAIN COMPUTER MODELS FOR THE SIMULATION OF ELECTRIC FIELDS DURING EXCITATION SPREAD IN CARDIAC TISSUE." In Biomathematics, 225–78. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812774859_0009.

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Sanders, Kenton M., and Tamas Ördög. "Properties of Electrical Rhythmicity in the Stomach." In Handbook of Electrogastrography. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195147889.003.0006.

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Gastric peristaltic contractions are the basis for emptying of solids from the stomach. These events begin in the mid to high corpus region, develop into a ring around the stomach, and spread down the length of the stomach to the pylorus. The pressure wave resulting from gastric peristalsis pushes the contents of the stomach toward the pyloric sphincter, but a nearly simultaneous contraction of the ring of muscle in the pyloric canal and the terminal antrum ultimately forces much of the food in the retrograde direction, toward the body of the stomach. Sheer forces that develop as a result of this forceful retropulsion cause mechanical disruption of solid particles. Repetitive peristaltic contractions (e.g., in the human these events occur about 3 times per minute), over a period of time, reduces ingested foods to small particles. The action of gastric peristalsis in the distal stomach facilitates emptying and the reduced particle diameter aides in chemical digestion of foods in the small intestine. Pathophysiological conditions that disrupt or disorganize gastric peristalsis can impair or delay normal gastric emptying. Gastric peristaltic contractions result from depolarization of the plasma membranes of smooth muscle cells. For many years it has been known that gastric muscles display periodic (or rhythmic) electrical activity in which membrane potential oscillates between negative potentials and more depolarized levels. The oscillations in membrane potential are known as electrical slow waves (see Color Figs. 2.1 and 2.2 in separate color insert). Slow waves are generated within the tunica muscularis of the proximal corpus along the greater curvature of the stomach, and these events spread around the circumference and down the stomach to the pylorus. A greater velocity of propagation around the stomach than down the stomach causes development of a ring of excitation, and this is the electrical basis underlying gastric peristaltic contractions. Studies have shown that electrical slow waves are generated by specialized pacemaker cells, known as interstitial cells of Cajal (ICCs). The main pacemaker ICCs in the stomach form a dense network of electrically coupled cells between the circular and longitudinal muscle layers of the corpus and antrum.
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Koch, Christof. "Ionic Channels." In Biophysics of Computation. Oxford University Press, 1998. http://dx.doi.org/10.1093/oso/9780195104912.003.0014.

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In the previous chapters, we studied the spread of the membrane potential in passive or active neuronal structures and the interaction among two or more synaptic inputs. We have yet to give a full account of ionic channels, the elementary units underlying all of this dizzying variety of electrical signaling both within and between neurons. Ionic channels are individual proteins anchored within the bilipid membrane of neurons, glia, or other cells, and can be thought of as water-filled macromolecular pores that are permeable to particular ions. They can be exquisitely voltage sensitive, as the fast sodium channel responsible for the sodium spike in the squid giant axon, or they can be relatively independent of voltage but dependent on the binding of some neurotransmitter, as is the case for most synaptic receptors, such as the acetylcholine receptor at the vertebrate neuromuscular junction or the AMPA and GABA synaptic receptors mediating excitation and inhibition in the central nervous system. Ionic channels are ubiquitous and provide the substratum for all biophysical phenomena underlying information processing, including mediating synaptic transmission, determining the membrane voltage, supporting action potential initiation and propagation, and, ultimately, linking changes in the membrane potential to effective output, such as the secretion of a neurotransmitter or hormone or the contraction of a muscle fiber. Individual ionic channels are amazingly specific. A typical potassium channel can distinguish a K+ ion with a 1.33 Å radius from a Na+ ion of 0.95 Å radius, selecting the former over the latter by a factor of 10,000. This single protein can do this selection at a rate of up to 100 million ions each second (Doyle et al, 1998). At the time of Hodgkin and Huxley’s seminal study in the early 1950s, two broad classes of transport mechanisms were competing as plausible ways for carrying ionic fluxes across the membrane: carrier molecules and pores. At the time, no direct evidence for either one existed. It was not until the early 1970s that the fast ACh synaptic receptor and the Na channel were chemically isolated and purified and identified as proteins.
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Тези доповідей конференцій з теми "Spread of Excitation"

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Svilainis, Linas, Alberto Rodriguez-Martinez, Andrius Chaziachmetovas, and Arturas Aleksandrovas. "Application of binary excitation spread spectrum signals for spectral compensation." In 2017 9th IEEE International Conference on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications (IDAACS). IEEE, 2017. http://dx.doi.org/10.1109/idaacs.2017.8095257.

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Ilgner, J., A. Stockmann, TA Duong Dinh, and M. Westhofen. "Clinical value of “spread of excitation” diagnostics for cochlear implantation." In Abstract- und Posterband – 89. Jahresversammlung der Deutschen Gesellschaft für HNO-Heilkunde, Kopf- und Hals-Chirurgie e.V., Bonn – Forschung heute – Zukunft morgen. Georg Thieme Verlag KG, 2018. http://dx.doi.org/10.1055/s-0038-1640381.

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Sellon, Jonathan B., Roozbeh Ghaffari, Shirin Farrahi, Guy P. Richardson, and Dennis M. Freeman. "Tectorial membrane porosity controls spread of excitation and tuning in the cochlea." In MECHANICS OF HEARING: PROTEIN TO PERCEPTION: Proceedings of the 12th International Workshop on the Mechanics of Hearing. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4939394.

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Hofer, Ernst, Ingrid Schafferhofer, Dieter Platzer, and Gerald Urban. "A new system to measure micropatterns of the excitation spread of the heart." In 1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1992. http://dx.doi.org/10.1109/iembs.1992.5761421.

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Hofer, Schafferhofer, Platzer, and Urban. "A New System To Measure Micropatterns Of The Excitation Spread Of The Heart." In Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1992. http://dx.doi.org/10.1109/iembs.1992.592718.

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Chen, Fei, Tian Guan, and Lena L. N. Wong. "Effects of excitation spread on the intelligibility of Mandarin speech in cochlear implant simulations." In 2012 8th International Symposium on Chinese Spoken Language Processing (ISCSLP 2012). IEEE, 2012. http://dx.doi.org/10.1109/iscslp.2012.6423502.

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Yousefi, Ali, and Kullervo Hynynen. "Transcranial shear-mode ultrasound imaging Characterization of Point Spread Function and assessment of excitation techniques." In 2008 IEEE Ultrasonics Symposium (IUS). IEEE, 2008. http://dx.doi.org/10.1109/ultsym.2008.0329.

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Yu, J., T. M. Antonsen, and G. S. Nusinovich. "Effects of beam velocity spread on the excitation of backward waves in beam tunnels of high-power gyrotrons." In 2010 IEEE 37th International Conference on Plasma Sciences (ICOPS). IEEE, 2010. http://dx.doi.org/10.1109/plasma.2010.5534353.

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9

Bejgam, Raghavendra R., and Mathew P. James. "Identification and Avoidance of Impeller Resonance From Impeller Interference Diagram (SAFE-Diagram) for an Open Impeller in an Integrally Geared Centrifugal Air Compressor." In ASME 2017 Gas Turbine India Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gtindia2017-4599.

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The structural integrity and reliability of impeller–shaft assembly in a centrifugal air compressor or any turbo machinery is of at most importance for the trouble free operation. It is thus necessary to avoid any excitation that can cause a resonance for the impeller–shaft system. Considering above, a study on the resonance due to excitation from impeller–stator interaction is undertaken. This paper deals with the construction of impeller interference diagram from the nodal diameters predicted from the cyclic symmetric model of a prototype impeller using ABAQUS. The excitations frequencies arising from impeller–diffuser and impeller–scroll tongue interactions are identified and calculated for the given impeller, diffuser and scroll system. These excitation frequencies are validated for a similar impeller through noise testing and concluded as potential excitation to be considered in design. Stress analysis was carried out to study stresses caused due to centrifugal forces & aerodynamic forces. A nonlinear Static analysis was carried out to account for dynamic stiffening due to centrifugal forces, prior to natural frequency extraction. The Campbell and SAFE diagrams are constructed and the interfering frequencies are identified from the plots constructed in a spread sheet. The nodal diameter versus harmonic force matrix is constructed to understand the forces that can excite a particular nodal diameter for both impeller and impeller–diffuser. From this analysis, it was inferred that diffuser pass frequency was exciting the impeller nodal diameter. Further, analysis was performed to evaluate dynamic stress by carrying out harmonic analysis. Study was carried out to shift natural frequencies of impeller without significantly affecting aerodynamic performance. Iteratively disk back face design, disk thickness, blade thickness & blade geometry were modified to shift frequencies. Frequency extraction procedure was automated by developing user defined macro in ABAQUS. After carrying out study and evaluating possible design Iterations, modifying the impeller blade geometry or altering frequency of source excitation by decreasing the number of diffuser blades were two possible solutions. The effect of both is studied in this paper.
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10

Biesinger, Thomas, Maximilian Kölzer, Alexander Schukmann, Harald Roclawski, Marc Kainz, Philippe Godin, Juan Carlos Morales, and Laith Zori. "Application of the Harmonic Balance Method for Large Spread Multiple Frequency Scales." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-79393.

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Abstract This paper presents the application of the harmonic balance method to periodic turbomachinery flow problems containing multiple fundamental frequencies. It is well known that the solution convergence of a transient turbomachinery flow using classical integration methods is computationally intensive and requires the integration for multiple periods to achieve a converged periodic solution. The computational effort is even higher when multiple fundamental frequencies (vastly different time scales) are modeled since the time stepping required is limited by the higher frequency in the flow. Unlike the classical time integration methods, the multifrequency harmonic balance method is very well suited for these applications since it allows for much faster calculations than the standard time marching algorithms. In addition, to resolve all the fundamental frequencies and higher harmonics, the current implementation of the harmonic balance method allows for solutions on unequal time interval distributions of the time planes. Given a user-defined list of frequencies that govern the flow problem, this method utilizes an optimization strategy to compute the time planes. There are two simulation cases of interest: aerodynamic performance and forced response analyses, both with different accuracy requirements. The number of required frequencies is dependent on the goal of the simulation. For aerodynamic performance analysis, global quantities such efficiency, pressure ratio, etc. can be predicted with fewer fundamental frequencies than forced response analysis where accurate local flow details demand a higher number of fundamental frequencies. The advantages of the multifrequency harmonic balance are illustrated by modeling two radial turbine configurations subjected to an inlet pulse from a reciprocating engine. Not only the expected trends such as higher-modes modeling granularity and time transient accuracy are shown, but also the calculations agree well with experimental data. The computational effort can be up to tenfold lower than the standard time-marching simulations. Machine aerodynamic performance predictions from the harmonic balance method are compared to accurate time-marching solutions and experimental data measurements. The efficiency of the computation is also discussed. The second example will compare the predicted surface excitation from the harmonic balance method vs. the time-marching solution.
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