Gotowe bibliografie tematyczne / Disturbance

Gotowa bibliografia na temat „Disturbance”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 25 maja 2024

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Artykuły w czasopismach na temat "Disturbance"

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Phukapak, Sorawin, Daisuke Koyama, Kotaro Hashikura, Md Kama, Iwanori Murakami i Kou Yamada. "Parameterization of All Disturbance Observers for Periodic Input Disturbances". ECTI Transactions on Electrical Engineering, Electronics, and Communications 21, nr 2 (27.06.2023): 249809. http://dx.doi.org/10.37936/ecti-eec.2023212.249809.

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In this paper, we examine the parameterizations of all disturbance observers and all linear functional disturbance observers for periodic input disturbances. The plant disturbance observers have been used to estimate the disturbance in the plant. Several papers on design methods for disturbance observers have been published. Recently, the parameterization of all dis- turbance observers and all linear functional disturbance observers for plants with any input disturbance was clarified. However, no paper examines the parameteriza- tion of all disturbance observers or all linear functional disturbances for periodic input disturbances. In this paper, we propose parameterizations of all disturbance observers and all linear functional disturbance observers for periodic input disturbances.
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Dornelas, Maria. "Disturbance and change in biodiversity". Philosophical Transactions of the Royal Society B: Biological Sciences 365, nr 1558 (27.11.2010): 3719–27. http://dx.doi.org/10.1098/rstb.2010.0295.

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Understanding how disturbance affects biodiversity is important for both fundamental and applied reasons. Here, I investigate how disturbances with different ecological effects change biodiversity metrics. I define three main types of disturbance effects: D disturbance (shifts in mortality rate), B disturbance (shifts in reproductive rates) and K disturbance (shifts in carrying capacity). Numerous composite disturbances can be defined including any combination of these three types of ecological effects. The consequences of D , B and K disturbances, as well as of composite DBK disturbances are examined by comparing metrics before and after a disturbance, in disturbed and undisturbed communities. I use simulations of neutral communities and examine species richness, total abundance and species abundance distributions. The patterns of change in biodiversity metrics are consistent among different types of disturbance. K disturbance has the most severe effects, followed by D disturbance, and B disturbance has nearly negligible effects. Consequences of composite DBK disturbances are more complex than any of the three types of disturbance, with unimodal relationships along a disturbance gradient arising when D, B and K are negatively correlated. Importantly, regardless of disturbance type, community isolation enhances the negative consequences and hinders the positive effects of disturbances.
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Yamada, Kou, Tatsuya Sakanushi, Iwanori Murakami, Yoshinori Ando, Yuki Nakui i Da Zhi Gong. "A Design Method for Control System to Attenuate Unknown Input Andoutput Disturbances Using Disturbance Observers". Key Engineering Materials 497 (grudzień 2011): 182–96. http://dx.doi.org/10.4028/www.scientific.net/kem.497.182.

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In this paper, we examine a design method for control system to attenuate unknown inputand output disturbances using disturbance observers. The disturbance observers have been usedto estimate the disturbance in the plant. Several papers on design methods of disturbance observershave been published. Recently, parameterizations of all disturbance observers and all linear functionaldisturbance observers for plants with any input and output disturbances were clarified. If parameterizationsof all disturbance observers and all linear functional disturbance observers for any input andoutput disturbances are used, there is a possibility that we can design control systems to attenuate unknowninput and output disturbances effectively. However, no paper has examined a design methodfor control system using parameterizations of all disturbance observers and all linear functional disturbanceobservers for plants with any input and output disturbances. In this paper, in order to attenuateunknown input and output disturbances effectively, we propose a design method for control systemusing parameterizations of all disturbance observers and all linear functional disturbance observersfor plants with any input and output disturbances. In addition, control characteristics of the proposedcontrol system are clarified.
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Murakami, Iwanori, Kou Yamada, Takaaki Hagiwara, Da Zhi Gong, Yoshinori Ando, Yoichi Imai i Masahiko Kobayashi. "An Application of the Parameterization of all Disturbance Observers for Motor Control Experiment". Applied Mechanics and Materials 36 (październik 2010): 210–19. http://dx.doi.org/10.4028/www.scientific.net/amm.36.210.

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Disturbance observers have been used to estimate the disturbance in the plant. Recently, parameterizations of all disturbance observers and all linear functional disturbance observers for plants with any output disturbance were clarified. If parameterizations of all disturbance observers and all linear functional disturbance observers for plants with any output disturbance are used, there is a possibility that we can design control systems to attenuate unknown output disturbances effectively. From this viewpoint, a design method for control system to attenuate unknown output disturbances using parameterizations of all disturbance observers and all linear functional disturbance observers was proposed. However, an application of control system to attenuate unknown output disturbances using parameterizations of all disturbance observers and all linear functional disturbance observers for real plants in motion-control field is not examined. In this paper, we show the effectiveness of the control system to attenuate unknown output disturbances using parameterizations of all disturbance observers and all linear functional disturbance observers for the angular velocity and the angle control for motor control experiment.
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Shimizu, Katsuto, Tetsuji Ota i Nobuya Mizoue. "Accuracy Assessments of Local and Global Forest Change Data to Estimate Annual Disturbances in Temperate Forests". Remote Sensing 12, nr 15 (29.07.2020): 2438. http://dx.doi.org/10.3390/rs12152438.

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Forest disturbances are generally estimated using globally available forest change maps or locally calibrated disturbance maps. The choice of disturbance map depends on the trade-offs among the detection accuracy, processing time, and expert knowledge. However, the accuracy differences between global and local maps have still not been fully investigated; therefore, their optimal use for estimating forest disturbances has not been clarified. This study assesses the annual forest disturbance detection of an available Global Forest Change map and a local disturbance map based on a Landsat temporal segmentation algorithm in areas dominated by harvest disturbances. We assess the forest disturbance detection accuracies based on two reference datasets in each year. We also use a polygon-based assessment to investigate the thematic accuracy based on each disturbance patch. As a result, we found that the producer’s and user’s accuracies of disturbances in the Global Forest Change map were 30.1–76.8% and 50.5–90.2%, respectively, for 2001–2017, which corresponded to 78.3–92.5% and 88.8–97.1%, respectively in the local disturbance map. These values indicate that the local disturbance map achieved more stable and higher accuracies. The polygon-based assessment showed that larger disturbances were likely to be accurately detected in both maps; however, more small-scale disturbances were at least partially detected by the Global Forest Change map with a higher commission error. Overall, the local disturbance map had higher forest disturbance detection accuracies. However, for forest disturbances larger than 3 ha, the Global Forest Change map achieved comparable accuracies. In conclusion, the Global Forest Change map can be used to detect larger forest disturbances, but it should be used cautiously because of the substantial commission error for small-scale disturbances and yearly variations in estimated areas and accuracies.
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Wang, Zhen, Zhong Wu, Lijun Li i Jun Yuan. "A composite anti-disturbance control scheme for attitude stabilization and vibration suppression of flexible spacecrafts". Journal of Vibration and Control 23, nr 15 (9.12.2015): 2470–77. http://dx.doi.org/10.1177/1077546315617632.

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Abstract: There exist multiple disturbances resulting from the structural vibrations of flexible appendages, unknown external and internal disturbances, and parameter uncertainties, which affect the attitude control performance seriously. To enhance the disturbance attenuation performance and vibration suppression ability, a composite anti-disturbance control scheme (CADCS) based on disturbance observer is proposed for attitude stabilization and vibration reduction of flexible spacecraft. The CADCS combines a composite disturbance observer (CDO) and a PD controller with feedforward. The multiple disturbances are equivalent to slowly varying disturbance and harmonic disturbance. The CDO can estimate two types of disturbance and compensate for them through feedforward. The PD controller realizes the asymptotic convergence by compensating the disturbance from CDO. The CADCS based on CDO and PD controller is not only simple and easy to realize, but also yields better vibration suppression and anti-disturbance performance. Simulation results of a certain spacecraft demonstrate the effectiveness of the proposed CADCS.
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Zhang, Huifeng, Xinjiang Wei, Lingyan Zhang i Meiqin Tang. "Disturbance rejection for nonlinear systems with mismatched disturbances based on disturbance observer". Journal of the Franklin Institute 354, nr 11 (lipiec 2017): 4404–24. http://dx.doi.org/10.1016/j.jfranklin.2017.03.009.

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Hart, Justin, i Jonathan Kleinman. "What Are Intermediate-Severity Forest Disturbances and Why Are They Important?" Forests 9, nr 9 (19.09.2018): 579. http://dx.doi.org/10.3390/f9090579.

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The classification of discrete forest disturbance events is usually based on the spatial extent, magnitude, and frequency of the disturbance. Based on these characteristics, disturbances are placed into one of three broad categories, gap-scale, intermediate-severity, or catastrophic disturbance, along the disturbance classification gradient. We contend that our understanding of disturbance processes near the endpoints of the disturbance classification gradient far exceeds that of intermediate-severity events. We hypothesize that intermediate-severity disturbances are more common, and that they are more important drivers of forest ecosystem change than is commonly recognized. Here, we provide a review of intermediate-severity disturbances that includes proposed criteria for categorizing disturbances on the classification gradient. We propose that the canopy opening diameter to height ratio (D:H) be used to delineate gap-scale from intermediate-severity events and that the threshold between intermediate and catastrophic events be based on the influence of residual trees on the composition of the regeneration layer. We also provide examples of intermediate-severity disturbance agents, return intervals for these events, and recommendations for incorporating natural intermediate-severity disturbance patterns in silvicultural systems.
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Yi, Yang, Lubing Xu, Hong Shen i Xiangxiang Fan. "Disturbance observer-based L1 robust tracking control for hypersonic vehicles with T-S disturbance modeling". International Journal of Advanced Robotic Systems 13, nr 6 (16.11.2016): 172988141667111. http://dx.doi.org/10.1177/1729881416671117.

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This article concerns a disturbance observer-based L1 robust anti-disturbance tracking algorithm for the longitudinal models of hypersonic flight vehicles with different kinds of unknown disturbances. On one hand, by applying T-S fuzzy models to represent those modeled disturbances, a disturbance observer relying on T-S disturbance models can be constructed to track the dynamics of exogenous disturbances. On the other hand, L1 index is introduced to analyze the attenuation performance of disturbance for those unmodeled disturbances. By utilizing the existing convex optimization algorithm, a disturbance observer-based proportional-integral-controlled input is proposed such that the stability of hypersonic flight vehicles can be ensured and the tracking error for velocity and altitude in hypersonic flight vehicle models can converge to equilibrium point. Furthermore, the satisfactory disturbance rejection and attenuation with L1 index can be obtained simultaneously. Simulation results on hypersonic flight vehicle models can reflect the feasibility and effectiveness of the proposed control algorithm.
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Liu, Y., W. C. Guo, R. Cao, Z. Chen i L. Wang. "Dynamic performance and sensitivity of grid-connected hydropower station under uncertain disturbance". IOP Conference Series: Earth and Environmental Science 1079, nr 1 (1.09.2022): 012113. http://dx.doi.org/10.1088/1755-1315/1079/1/012113.

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Abstract The grid-connected operating condition of hydropower station is a common operation mode to provide electric energy for the load side. This paper investigates the dynamic performance and sensitivity of grid-connected hydropower station (GCHS) under uncertain disturbance. Firstly, the nonlinear uncertain model of GCHS under uncertain disturbance is established. Then, the dynamic performance of GCHS is studied when the governor parameters change under certain step disturbance, periodic disturbance and uncertain random disturbance, respectively. Finally, based on the sensitivity index of the uncertain output obtained from the extended Fourier amplitude sensitivity test method, the sensitivity of the uncertain random disturbance at different input positions is studied. The results indicate that the GCHS under periodic disturbances or random disturbances have more complex dynamic performance than that under certain step disturbance. Under periodic disturbance, the forced oscillations and high frequency resonances are generated in dynamic response of GCHS. Under the uncertain random disturbance, the system of GCHS always presents random oscillation. The state variables q H , z, qP, y, x s , x t , and δ of GCHS are the most sensitive to uncertain disturbances, which are introduced at the generator or surge tank. The uncertain disturbances have significant interaction on the dynamic response of GCHS.
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Rozprawy doktorskie na temat "Disturbance"

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McGuire, Tanner J. "Domestic Disturbance". CSUSB ScholarWorks, 2017. https://scholarworks.lib.csusb.edu/etd/569.

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My work explores domesticity, the role reversal happening in the family dynamics, the banality of home life, and the common escapism that occurs in parents. Men play a larger role in the home and women play a larger role outside the home blurring the lines of responsibility and changing expectations. This emasculating process often creates a power struggle within the home. These common issues are the fodder for my artistic practice. Domestic pattern, utility, sexual frustration, chaos and contentment all play a part.
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Mackey, Robin L. "Disturbance and biodiversity". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ66170.pdf.

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Glas, Michael, i Henrik Fredriksson. "Operational Disturbances in Supply Management : Sources and Managerial Approaches". Thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Centre of Logistics and Supply Chain Management, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-18146.

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Nowadays global companies view the world as a single entity, sourcing materials fromanywhere and performing operations to create the optimal supply chain for their products.This leads to an increasing complexity which is driving supply management to becomea core capability of businesses. As supply chains are inherently vulnerable to disturbances,supply management will have to play a key role in the field of risk analysisand risk management. An increased awareness of sources of disturbances is essential tocreate significant improvements in the handling and prevention of disturbances.The purpose of this thesis is to identify and classify sources of disturbance which canhave a negative influence on a company’s supply management. This is achieved by theinvestigation of theories available in literature, as well as identifying and analyzing thedisturbances in the supply management of an international manufacturing company.Additionally, the theories on disturbance management are reviewed to create a foundationfor managerial implications.The company studied is Husqvarna, which currently is in a situation with several disturbancesin its supply management. The performed case study aims at both, describingthese phenomena, as well as testing of the theories. The chosen qualitative approachmakes it possible to gain in-depth knowledge and investigate different aspects ofsources of disturbances in this case study. The interviews performed are standardizedopen ended questionnaires in order to get in-depth knowledge of the situation.The empirical findings are then analyzed in regard to the purpose of the thesis. The goalof this analysis is to compare the sources of disturbances of the classification schemecreated in the literature review to the respondents’ answers from the interviews. Moreover,inputs and opinions from the respondents on how to manage disturbances are connectedwith the theories provided in the literature review within this field.Various sources of disturbance with a negative influence on the supply management ofcompanies are identified. It was also possible to compare the classification schemewhich was created based on the theoretical findings with the finding of the case study ofHusqvarna. Consequently a holistic overview of potential and actual sources of disturbancein supply management has been created. Furthermore, it is possible to contribute tothe body of knowledge on how to manage disturbances in supply management. Theprovided insights highlight implications that can help companies to successfully managedisturbances and hence improve their performance.
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Davidson, Judith Rutherford. "Cancer and sleep disturbance". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ59523.pdf.

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Törnquist, Johanna. "Railway traffic disturbance management /". Karlskrona : Blekinge Institute of Technology, 2006. http://www.bth.se/fou/forskinfo.nsf/01f1d3898cbbd490c12568160037fb62/4bff7793d57e9155c1257178004d42f9!OpenDocument.

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Zheng, Qing. "On Active Disturbance Rejection Control: Stability Analysis and Applications in Disturbance Decoupling Control". Cleveland, Ohio : Cleveland State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=csu1250274093.

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Thesis (D.Eng.)--Cleveland State University, 2009.
Abstract. Title from PDF t.p. (viewed on Oct. 26, 2009). Includes bibliographical references (p. 78-89). Available online via the OhioLINK ETD Center and also available in print.
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Watkins, Beth. "Differentiating early onset eating disturbance". Thesis, University of Reading, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398289.

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Connolly, Desmond Michael. "Visual effects of respiratory disturbance". Thesis, City University London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.514496.

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Peterson, Garry D. "Contagious disturbance and ecological resilience". [Florida] : State University System of Florida, 1999. http://etd.fcla.edu/etd/uf/1999/amg2055/peterson%5Fg.pdf.

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Thesis (Ph. D.)--University of Florida, 1999.
Title from first page of PDF file. Document formatted into pages; contains ix, 261 p.; also includes graphics. Vita. Includes bibliographical references (p. 248-260).
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Farrell, Clare. "Experimental analysis of body image disturbance". Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289293.

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Książki na temat "Disturbance"

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Disturbance. New York: Scribner, 2005.

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Barbara, Dawson, i Dublin City Gallery The Hugh Lane, red. Disturbance. Dublin]: Dublin City Gallery The Hugh Lane, 2011.

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Burke, Jan. Disturbance. New York: Simon & Schuster, 2011.

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Wohlgemuth, Thomas, Anke Jentsch i Rupert Seidl, red. Disturbance Ecology. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98756-5.

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Sleep disturbance. Windsor: NFER-NELSON, 1988.

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Ince, Susan. Sleep disturbance. Boston: Harvard Medical School, Health Publications Group, 1995.

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Speart, Jessica. Coastal Disturbance. New York: HarperCollins, 2007.

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F, Galley Helen, i Intensive Care Society (Great Britain), red. Endocrine disturbance. London: BMJ Books, 2000.

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Pacific disturbance. London: Mills & Boon, 1985.

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Grave disturbance. Seattle: Rat City Publishing, 2015.

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Części książek na temat "Disturbance"

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Jentsch, Anke, Rupert Seidl i Thomas Wohlgemuth. "Disturbances and Disturbance Regimes". W Landscape Series, 11–40. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98756-5_2.

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Urban, Dean L. "Disturbances and Disturbance Regimes". W Agents and Implications of Landscape Pattern, 55–83. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-40254-8_3.

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Boudell, Jere A. "Disturbance". W The Wetland Book, 1–3. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-007-6172-8_92-1.

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Karlson, Ronald H. "Disturbance". W Dynamics of Coral Communities, 140–64. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4842-9_7.

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Boudell, Jere A. "Disturbance". W The Wetland Book, 113–15. Dordrecht: Springer Netherlands, 2018. http://dx.doi.org/10.1007/978-90-481-9659-3_92.

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Weik, Martin H. "disturbance". W Computer Science and Communications Dictionary, 446. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_5428.

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Shorohova, Ekaterina, Tuomas Aakala, Sylvie Gauthier, Daniel Kneeshaw, Matti Koivula, Jean-Claude Ruel i Nina Ulanova. "Natural Disturbances from the Perspective of Forest Ecosystem-Based Management". W Advances in Global Change Research, 89–121. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-15988-6_3.

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AbstractNatural disturbances drive forest dynamics and biodiversity at different spatial and temporal scales. Forests in the boreal biome are shaped by several types of disturbance, including fire, windthrow, and insect outbreaks, that vary in frequency, extent, severity, and specificity. In managed forests, disturbances also affect the amount and quality of available timber. Ecosystem management uses information on disturbance regimes as a guide to finding a balance between ecological, economic, and social viewpoints. In this chapter, we review current knowledge on disturbance regimes in boreal forests and discuss some implications for managing the impact and risk of disturbances in the context of forest ecosystem management and restoration.
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Seidl, Rupert, Marie-Josée Fortin, Juha Honkaniemi i Melissa Lucash. "Modeling Natural Disturbances in Boreal Forests". W Advances in Global Change Research, 591–612. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-15988-6_24.

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AbstractNatural disturbances such as wildfires, insect outbreaks, and windthrow are important processes shaping the structure and functioning of boreal forests. Disturbances are expected to intensify in the future, and this change will have profound consequences on the supply of ecosystem services to society. Consequently, models are needed to project future disturbance trajectories and quantify disturbance impacts on boreal forests. Here, we summarize key concepts of modeling natural disturbances in boreal forests. We focus specifically on disturbances from wildfire, wind and snow, and herbivores and discuss the different approaches used to capture their dynamics in models.
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Aakala, Tuomas, Cécile C. Remy, Dominique Arseneault, Hubert Morin, Martin P. Girardin, Fabio Gennaretti, Lionel Navarro i in. "Millennial-Scale Disturbance History of the Boreal Zone". W Advances in Global Change Research, 53–87. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-15988-6_2.

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AbstractLong-term disturbance histories, reconstructed using diverse paleoecological tools, provide high-quality information about pre-observational periods. These data offer a portrait of past environmental variability for understanding the long-term patterns in climate and disturbance regimes and the forest ecosystem response to these changes. Paleoenvironmental records also provide a longer-term context against which current anthropogenic-related environmental changes can be evaluated. Records of the long-term interactions between disturbances, vegetation, and climate help guide forest management practices that aim to mirror “natural” disturbance regimes. In this chapter, we outline how paleoecologists obtain these long-term data sets and extract paleoenvironmental information from a range of sources. We demonstrate how the reconstruction of key disturbances in the boreal forest, such as fire and insect outbreaks, provides critical long-term views of disturbance-climate-vegetation interactions. Recent developments of novel proxies are highlighted to illustrate advances in reconstructing millennial-scale disturbance-related dynamics and how this new information benefits the sustainable management of boreal forests in a rapidly changing climate.
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Halanay, Aristide, i Vlad Ionescu. "Disturbance Attenuation". W Time-Varying Discrete Linear Systems, 145–85. Basel: Birkhäuser Basel, 1994. http://dx.doi.org/10.1007/978-3-0348-8499-0_5.

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Streszczenia konferencji na temat "Disturbance"

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Juntawongso, Jessada, Chuan Feng Zang, Kotaro Hashikura, Takaaki Suzuki i Kou Yamada. "Disturbance observers for constant disturbances". W 2019 16th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON). IEEE, 2019. http://dx.doi.org/10.1109/ecti-con47248.2019.8955399.

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Zang, Chuanfeng, Jessada Juntawongso, Kotaro Hashikura, Md Abdus Samad Kamal i Kou Yamada. "Disturbance observers for general exogenous disturbances". W 2019 IEEE International Conference on Mechatronics and Automation (ICMA). IEEE, 2019. http://dx.doi.org/10.1109/icma.2019.8816576.

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Yan, Wei, Huan Zhang, Zhi-ming Mao, Chao Yin, Chen-kai Zhang i Jun Hu. "Experimental Investigation of Compressor Aerodynamic Instability Induced by Rotating Disturbance". W ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26603.

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In twin-spool engines, there will be a rotating disturbance at the inlet of the downstream compressor when rotating stall occurs in the upstream compressor. It will lead the downstream compressor to aerodynamic instability if the speed difference between the two spools is not designed reasonably. In order to investigate how the rotating disturbance affects, a two-stage compressor is operated with a newly designed rotating disturbance generator running upstream. The generator is able to produce disturbances with different circumferential extent. It can also produce a disturbance with more than one cell. The rotating speed of the generated disturbances is designed up to 100 percent of the compressor speed. The experiments show that the compressor experiences significant degradation in its stall margin when the disturbance rotates at the “dangerous speed”. The circumferential extent of the rotating disturbance also has an influence on the stall margin. Rotating disturbances with larger circumferential extent lead to severer loss of stall margin. However, it does not affect the “dangerous speed”. The twin-cell disturbance affects the stall boundary of the compressor in a similar manner as the single-cell disturbance does. It is the rotating speed of each cell acts on the stall boundary. Based on the analysis of stall inception under different rotating disturbances, an explanation is given to interpret the mechanism of the “dangerous speed”. The “dangerous speed” is associated with the propagating speed of stall inception. When the disturbance is rotating at this speed, it will intensify the flow separation and accelerate the growth of rotating stall, thus aggravates the compressor aerodynamic stability.
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Wang, Luping, Huifeng Zhang, Fei Gao, Junjie Han i Xinjiang Wei. "Finite-time anti-disturbance control for systems with multiple disturbances based on disturbance observer". W 2022 34th Chinese Control and Decision Conference (CCDC). IEEE, 2022. http://dx.doi.org/10.1109/ccdc55256.2022.10033749.

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Chung, Meng-Hsuan, i Andrew M. Wo. "Navier-Stokes and Potential Calculations of Axial Spacing Effect on Vortical and Potential Disturbances and Gust Response in an Axial Compressor". W ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-301.

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The effect of blade row axial spacing on vortical and potential disturbances and gust response is studied for a compressor stator/rotor configuration near design and at high loadings using 2D incompressible Navier-Stokes and potential codes, both written for multistage calculations. First, vortical and potential disturbances downstream of the isolated stator in the moving frame are defined; these disturbances exclude blade row interaction effects. Then, vortical and potential disturbances for the stator/rotor configuration are calculated for axial gaps of 10%, 20%, and 30% chord. Results show that the potential disturbance is uncoupled; the potential disturbance calculated from the isolated stator configuration is a good approximation for that from the stator/rotor configuration for all three axial gaps. The vortical disturbance depends strongly on blade row interactions. Low order modes of vortical disturbance are of substantial magnitude and decay much more slowly downstream than do those of potential disturbance. Vortical disturbance decays linearly with increasing mode except very close to the stator trailing edge. For a small axial gap, lower order modes of both vortical and potential disturbances must be included to determine the rotor gust response.
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Armentor, Benjamin, Joseph Stevens, Nathan Madsen, Andrew Durand i Joshua Vaughan. "Effect of Short-Term Weather Predictions on Model Predictive Trajectory Tracking Performance of Unmanned Surface Vessels". W ASME 2020 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/dscc2020-3316.

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Abstract For mobile robots, such as Autonomous Surface Vessels (ASVs), limiting error from a target trajectory is necessary for effective and safe operation. This can be difficult when subjected to environmental disturbances like wind, waves, and currents. This work compares the tracking performance of an ASV using a Model Predictive Controller that includes a model of these disturbances. Two disturbance models are compared. One prediction model assumes the current disturbance measurements are constant over the entire prediction horizon. The other uses a statistical model of the disturbances over the prediction horizon. The Model Predictive Controller performance is also compared to a PI-controlled system under the same disturbance conditions. Including a disturbance model in the prediction of the dynamics decreases the trajectory tracking error over the entire disturbance spectrum, especially for longer horizon lengths.
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Chen, Xu, i Masayoshi Tomizuka. "Unknown Multiple Narrow-Band Disturbance Rejection in Hard Disk Drives: An Adaptive Notch Filter and Perfect Disturbance Observer Approach". W ASME 2010 Dynamic Systems and Control Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/dscc2010-4124.

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In this paper, an adaptive control scheme is developed to reject unknown multiple narrow-band disturbances in a hard disk drive. An adaptive notch filter is developed to efficiently estimate the frequencies of the disturbance. Based on the correctly estimated parameters, a disturbance observer with a newly designed multiple band-pass filter is constructed to achieve asymptotic perfect rejection of the disturbance. Evaluation of the control scheme is performed on a benchmark problem for HDD track following.
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Mishra, Sandipan, Manabu Yamada i Masayoshi Tomizuka. "Repetitive Control for Rejection of Periodic Multiplicative Disturbances and Adaptive Identification of the Unknown Period". W ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61817.

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Repetitive control has been used extensively for rejection of periodic disturbances, in systems that have to follow periodic trajectories. To date, most repetitive controllers have focused on rejection of additive periodic disturbances. This paper suggests the use of a repetitive control algorithm for rejection of periodic multiplicative disturbances. The first result is a simple design method of a new controller to reject the multiplicative disturbance effectively, provided that the period of the disturbance is known. This controller is based on the internal model principle and the design method consists of a simple norm condition. It is shown that this repetitive-type controller can reject the disturbance. The second result is an extension of the first one to the case that the period of the disturbance is unknown. A period estimator is added to the control system to identify the period of the multiplicative disturbance. The algorithm, consisting of an adaptive recursive least mean square method, is simple. It is shown that this adaptive controller can reject the disturbance with an uncertain period and guarantee the stability of the adaptive closed-loop system including the period estimator.
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O’Connor, Jacqueline, Shweta Natarajan, Michael Malanoski i Tim Lieuwen. "Disturbance Field Characteristics of a Transversely Excited Annular Jet". W ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22133.

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This paper describes an investigation of transverse acoustic instabilities in premixed, swirl-stabilized flames. Additional measurements, beyond the scope of the current work, are described in O’Connor et al. [1]. Transverse excitation of swirling flow involves complex interactions between acoustic waves and fluid mechanic instabilities. The flame’s response to transverse acoustic excitation is a superposition of both acoustic and vortical disturbances that fluctuate in both the longitudinal and transverse direction. In the nozzle near field region, the disturbance field is a complex superposition of convecting vortical disturbances, as well as longer wavelength transverse and longitudinal acoustic disturbances. Farther downstream, the disturbance field is dominated by the transverse acoustic field. The phasing between the disturbances on the inside and outside of the burner annulus, as well as the left and right sides of the burner annulus is a strong function of the transverse disturbance field characteristics. For cases where the burner centerline is an approximate pressure node and velocity anti-node, the mass flow out of the left and right sides of the burner actually oscillates out-of-phase with respect to each other. In contrast, for cases where the centerline is a pressure anti-node, the burner responds symmetrically about the burner and annulus centerlines. These results show that the burner response characteristics strongly depend upon their location in the acoustic mode shape.
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Zaki, A. S., K. Ghandi i A. A. Bent. "Optimal Piezoelectric Actuator Sizing Based on Random Disturbance Data". W ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/ad-23722.

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Abstract In general, active damping actuators are sized to induce a prescribed level of damping in the structure in the presence of specified disturbance. Unfortunately, structural disturbances cannot be measured directly. Instead, the effect of disturbances on structural response (e.g. deflection, strain, acceleration, etc.) are quantified either in a stochasitic (i.e. spectral data such as autospectrum) or deterministic (i.e. time history data). In this paper, a technique for sizing actuators based on stochastic disturbance information is presented. From the power spectral density of the response, the peak disturbance at each structural mode of interest can be computed as well as the total RMS of the response. A structural dynamic model is synthesized using either finite element analysis or Rayleigh-Ritz formulation. Based on this information, the disturbances can be estimated which is later used to determine whether the actuator size and configuration are sufficient to introduce the prescribed level of damping. The above algorithm is used to design and compare actuators configuration to reduce the vibration on F18 tail model. A comparison between active fiber composite (AFC) actuators and regular d31 actuators is presented. Simulation results show that the AFCs have more authority than the regular d31 actuator.
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Raporty organizacyjne na temat "Disturbance"

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Tait, Emma, Pia Ruisi-Besares, Matthias Sirch, Alyx Belisle, Jennifer Pontius i Elissa Schuett. Technical Report: Monitoring and Communicating Changes in Disturbance Regimes (Version 1.0). Forest Ecosystem Monitoring Cooperative, październik 2021. http://dx.doi.org/10.18125/cc0a0l.

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Shifts in disturbance patterns across the Northeast are of increasing concern as the climate continues to change. In particular, changes in patterns of frequency, severity and extent of disturbance event may have detrimental cascading impacts on forest ecosystems and human communities. To explore how changing disturbance regimes might impact future forest health and management it is necessary to understand the historical trends and impacts of disturbance in the region. Although individual types of disturbance have already been analyzed, there is a need for a consolidated overview of the current state of disturbance in northeastern forests. To address this need, the Forest Ecosystem Monitoring Cooperative (FEMC) developed the FEMC: Tracking Shifts in Disturbance Regimes web portal for users to explore changes over time of key disturbance drivers, identify important disturbance responses, and discover where monitoring is happening for both drivers and responses. In collaboration with our advisory committee, we identified key disturbance drivers—flood, high winds, fire, drought, pests—and responses—macroinvertebrates, cold-water fisheries, invasive plants—that are of particular concern in the region. For each of the drivers we identified a suitable regional dataset and analyzed changes over time in frequency, severity, and extent. We also created a structured framework to catalogue programs across the region that are monitoring for these disturbance drivers and responses. Version 1.0 of the FEMC: Tracking Shifts in Disturbance Regimes (https://uvm.edu/femc/disturbance) web portal, first released in October 2021, contains 272 data programs, 11 drivers and three responses. Through the web portal users can browse programs by state, driver type or response type, and explore where monitoring is happening across the region. Driver-specific analyses allow users to quickly see the trends in severity, frequency and extent of selected disturbances and compare the impacts in selected states to regional data. We hope that this collection of programs and the analysis of trends provide researchers and land managers with an easy way to understand the current state of disturbance in northeastern forests that enables them to analyze and plan for future impacts.
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LL Hale, MK Wright i NA Cadoret. 300 Area Disturbance Report. Office of Scientific and Technical Information (OSTI), styczeń 1999. http://dx.doi.org/10.2172/2655.

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POIRIER, MICHAEL. TANK 49H SOLIDS DISTURBANCE ANALYSIS. Office of Scientific and Technical Information (OSTI), grudzień 2020. http://dx.doi.org/10.2172/1756604.

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Poirier, Michael. Tank 49H Solids Disturbance Analysis. Office of Scientific and Technical Information (OSTI), luty 2021. http://dx.doi.org/10.2172/1766461.

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POIRIER, MICHAEL. TANK 49H SOLIDS DISTURBANCE ANALYSIS. Office of Scientific and Technical Information (OSTI), czerwiec 2021. http://dx.doi.org/10.2172/1810480.

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POIRIER, MICHAEL, i CHARLES NASH. TANK 49H SOLIDS DISTURBANCE ANALYSIS. Office of Scientific and Technical Information (OSTI), marzec 2022. http://dx.doi.org/10.2172/1864657.

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Linden, R. H., i J. J. Clague. Earthquake Disturbance in Vancouver Island Lakes. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/131217.

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Cliver, Edward W. Solar and Solar Wind Disturbance Predictions. Fort Belvoir, VA: Defense Technical Information Center, październik 2007. http://dx.doi.org/10.21236/ada475250.

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McDermott, Thomas, Arturo Suman Bretas, Kiana Pitman, Jeffery Dagle, Robert Arritt i Thomas Overbye. Industry Requirements for Geomagnetic Disturbance Models. Office of Scientific and Technical Information (OSTI), sierpień 2022. http://dx.doi.org/10.2172/1958720.

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Grogin, Phillip W. Excavation/Fill/Soil Disturbance, Self-Study #31419. Office of Scientific and Technical Information (OSTI), luty 2018. http://dx.doi.org/10.2172/1422894.

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