Relevant bibliographies by topics / Disturbances

Academic literature on the topic 'Disturbances'

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Published: 4 June 2021
Last updated: 25 May 2024

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Journal articles on the topic "Disturbances"

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Yamada, Kou, Tatsuya Sakanushi, Iwanori Murakami, Yoshinori Ando, Yuki Nakui, and Da Zhi Gong. "A Design Method for Control System to Attenuate Unknown Input Andoutput Disturbances Using Disturbance Observers." Key Engineering Materials 497 (December 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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Dornelas, Maria. "Disturbance and change in biodiversity." Philosophical Transactions of the Royal Society B: Biological Sciences 365, no. 1558 (November 27, 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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Phukapak, Sorawin, Daisuke Koyama, Kotaro Hashikura, Md Kama, Iwanori Murakami, and Kou Yamada. "Parameterization of All Disturbance Observers for Periodic Input Disturbances." ECTI Transactions on Electrical Engineering, Electronics, and Communications 21, no. 2 (June 27, 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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Shimizu, Katsuto, Tetsuji Ota, and Nobuya Mizoue. "Accuracy Assessments of Local and Global Forest Change Data to Estimate Annual Disturbances in Temperate Forests." Remote Sensing 12, no. 15 (July 29, 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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Zhang, Xiao-Yu, Run-Xiao Wang, Shun-Qi Zhang, Zhan-Xi Wang, Xian-Sheng Qin, and Rüdiger Schmidt. "Generalized-Disturbance Rejection Control for Vibration Suppression of Piezoelectric Laminated Flexible Structures." Shock and Vibration 2018 (2018): 1–17. http://dx.doi.org/10.1155/2018/1538936.

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In the framework of disturbance rejection (DR) control, the paper proposes a generalized-disturbance rejection (GDR) control with proportional-integral (PI) observer for vibration suppression of smart structures under any unknown continuous disturbances. In the proposed GDR-PI control, a refined state space model is first constructed, and a generalized disturbance including the disturbance influence matrices, unknown physical disturbances, and state variables is defined. In the closed loop of GDR-PI control, physical disturbances can be counteracted indirectly by feeding back estimated generalized disturbances. By this means, the GDR-PI control remedies most of the defects in conventional DR control and has excellent performances especially in the following situations: (i) the disturbances are completely unknown; (ii) the number of sensor signals is less than the number of disturbances; (iii) the unknown disturbances vary fast. Finally, the GDR-PI control is validated and compared with H∞ state feedback control and conventional DR control available in the literature for vibration suppression of smart beams.
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Pan, Shihao, Ting Wang, Haoran Zhang, and Tao Li. "Trajectory Tracking Control Based on a Composite Disturbance Observer for Unmanned Autonomous Helicopters under Multiple Disturbances." Machines 12, no. 3 (March 19, 2024): 201. http://dx.doi.org/10.3390/machines12030201.

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This paper studies the trajectory tracking anti-disturbance control of unmanned autonomous helicopters (UAHs) under matched disturbances and mismatched ones. Firstly, the six-degrees-of-freedom UAH nonlinear system is simplified via feedback linearization to handle strong coupling, in which the multiple disturbances are composed of modeled disturbances and time-varying bounded ones. Secondly, in order to estimate these disturbances, a new design method of a composite disturbance observer is proposed. On the one hand, for the mismatched disturbances, a normal disturbance observer (DO) combined with a backstepping control are utilized to handle their negative effect. On the other hand, two refined disturbance observers (RDOs) are constructed to estimate the matched disturbances, in which the coupling estimations are involved. Then, by designing two anti-disturbance composite controllers, the boundedness of the tracking errors is guaranteed by using the Lyapunov stability theory. Finally, some numerical simulations are provided to demonstrate the effectiveness and advantage of the proposed control scheme.
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Taimoor, Muhammad, Li Aijun, and Rooh ul Amin. "Disturbances rejection based on sliding mode control." Aircraft Engineering and Aerospace Technology 91, no. 4 (April 1, 2019): 680–99. http://dx.doi.org/10.1108/aeat-04-2018-0121.

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Purpose The purpose of this paper aims to investigate an effective algorithm for different types of disturbances rejection. New dynamics are designed based on disturbance. Observer-based sliding mode control (SMC) technique is used for approximation the disturbances as well as to stabilize the system effectively in presence of uncertainties. Design/methodology/approach This research work investigates the disturbances rejection algorithm for fixed-wing unmanned aerial vehicle. An algorithm based on SMC is introduced for disturbances rejection. Two types of disturbances are considered, the constant disturbance and the sinusoidal disturbance. The comprehensive lateral and longitudinal models of the system are presented. Two types of dynamics, the dynamics without disturbance and the new dynamics with disturbance, are presented. An observer-based algorithm is presented for the estimation of the dynamics with disturbances. Intensive simulations and experiments have been performed; the results not only guarantee the robustness and stability of the system but the effectiveness of the proposed algorithm as well. Findings In previous research work, new dynamics based on disturbances rejection are not investigated in detail; in this research work both the lateral and longitudinal dynamics with different disturbances are investigated. Practical implications As the stability is always important for flight, so the algorithm proposed in this research guarantees the robustness and rejection of disturbances, which plays a vital role in practical life for avoiding any kind of damage. Originality/value In the previous research work, new dynamics based on disturbances rejection are not investigated in detail; in this research work both the lateral and longitudinal dynamics with different disturbances are investigated. An observer-based SMC not only approximates the different disturbances and also these disturbances are rejected in order to guarantee the effectiveness and robustness.
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Mahajan, Rahul B., and Gregory J. Hakim. "Spatial Growth of Perturbations in a Turbulent Baroclinic Jet." Journal of the Atmospheric Sciences 68, no. 11 (November 1, 2011): 2731–41. http://dx.doi.org/10.1175/jas-d-11-038.1.

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Abstract The spatial spreading of infinitesimal disturbances superposed on a turbulent baroclinic jet is explored. This configuration is representative of analysis errors in an idealized midlatitude storm track and the insight gained may be helpful to understand the spreading of forecast errors in numerical weather prediction models. This problem is explored through numerical experiments of a turbulent baroclinic jet that is perturbed with spatially localized disturbances. Solutions from a quasigeostrophic model for the disturbance fields are compared with those for a passive tracer to determine whether disturbances propagate faster than the basic-state flow. Results show that the disturbance spreading rate is sensitive to the structure of the initial disturbance. Disturbances that are localized in potential vorticity (PV) have far-field winds that allow the disturbance to travel downstream faster than disturbances that are initially localized in geopotential, which have no far-field wind. Near the jet, the spread of the disturbance field is observed to exceed the tracer field for PV-localized disturbances, but not for the geopotential-localized disturbances. Spreading rates faster than the flow for geopotential-localized disturbances are found to occur only for disturbances located off the jet axis. These results are compared with those for zonal and time-independent jets to qualitatively assess the effects of transience and nonlinearity. This comparison suggests that the average properties of localized perturbations to the turbulent jet can be decomposed into a superposition of dynamics associated with a time-independent parallel flow plus a “diffusion” process.
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Shimizu, Katsuto, Tetsuji Ota, and Nobuya Mizoue. "Detecting Forest Changes Using Dense Landsat 8 and Sentinel-1 Time Series Data in Tropical Seasonal Forests." Remote Sensing 11, no. 16 (August 14, 2019): 1899. http://dx.doi.org/10.3390/rs11161899.

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The accurate and timely detection of forest disturbances can provide valuable information for effective forest management. Combining dense time series observations from optical and synthetic aperture radar satellites has the potential to improve large-area forest monitoring. For various disturbances, machine learning algorithms might accurately characterize forest changes. However, there is limited knowledge especially on the use of machine learning algorithms to detect forest disturbances through hybrid approaches that combine different data sources. This study investigated the use of dense Landsat 8 and Sentinel-1 time series data for detecting disturbances in tropical seasonal forests based on a machine learning algorithm. The random forest algorithm was used to predict the disturbance probability of each Landsat 8 and Sentinel-1 observation using variables derived from a harmonic regression model, which characterized seasonality and disturbance-related changes. The time series disturbance probabilities of both sensors were then combined to detect forest disturbances in each pixel. The results showed that the combination of Landsat 8 and Sentinel-1 achieved an overall accuracy of 83.6% for disturbance detection, which was higher than the disturbance detection using only Landsat 8 (78.3%) or Sentinel-1 (75.5%). Additionally, more timely disturbance detection was achieved by combining Landsat 8 and Sentinel-1. Small-scale disturbances caused by logging led to large omissions of disturbances; however, other disturbances were detected with relatively high accuracy. Although disturbance detection using only Sentinel-1 data had low accuracy in this study, the combination with Landsat 8 data improved the accuracy of detection, indicating the value of dense Landsat 8 and Sentinel-1 time series data for timely and accurate disturbance detection.
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Benmansour, Jalal eddine, and Boulanouare Khouane. "Attitude stabilization of slosh-coupled satellite with flexible appendage." Algerian Journal of Signals and Systems 6, no. 3 (September 30, 2021): 175–80. http://dx.doi.org/10.51485/ajss.v6i3.131.

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In this paper, a robust control scheme is proposed for flexible satellite attitude stabilization in the presence of multiple disturbances including the disturbances caused by flexible appendages with the sloshing dynamics of the liquid propellant and external disturbances from space environment. A composite control scheme is designed by combining a composite disturbance observer (CDO) with feed-forward controller. First, a CDO is constructed to estimate the lumped disturbances, where the lumped disturbances in the system are equivalent into two parts: a slow varying disturbance and periodic disturbance. Then a PD controller is adopted to stabilize the system and restrain the residue disturbance. Finally, the simulation results for flexible satellite verify that the proposed method can make the satellite asymptotically stable and demonstrate the effectiveness of the proposed scheme.
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Dissertations / Theses on the topic "Disturbances"

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Kidd, Kathryn Rebecca Booker. "Forest Disturbances: Occurrences and Impacts of Recreational, Hydrogeomorphic, and Climatic Disturbances." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/51765.

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Disturbances impact abiotic and biotic components within forested ecosystems. This dissertation identifies the impacts of recreational crossing disturbances on water quality, uses dendrochronological techniques to estimate sediment deposition and identify impacts hydrology and climate on radial growth in riparian forested wetlands, and quantifies influences of biotic and abiotic factors on the occurrence of frost-induced cambial damage. In southwestern Virginia, modeled soil erosion rates for multiple-use (hiking, mountain biking, and horseback riding) recreational trail approaches to stream crossings were found to be 13 times greater than rates for undisturbed forests. Downstream changes in macroinvertebrate-based indices indicated water quality was negatively affected downstream from culvert and ford crossings. These findings illustrate recreational stream crossings have the potential to deliver sediment into adjacent streams, particularly where best management practices are not being rigorously implemented, and as a result can negatively impact water quality below stream crossings. Impacts of hydrologic regime were apparent on sediment deposition and on green ash (Fraxinus pennsylvanica Marsh.) and water tupelo (Nyssa aquatica L.) radial growth along the Tensaw River in southwest Alabama. Annual dendrogeomorphic sediment accretion rates were significantly greater for a recent time period (25 years) when compared to longer term rates (131 years) along a natural levee and backswamp. Radial growth in green ash along the natural levee and backswamp was found to be significantly correlated with days flooded and average daily stage level during April while water tupelo further in the backswamp appeared resistant to hydrologic and climatic fluctuations. Results illustrate the importance of riparian wetlands in trapping sediment from adjacent waterways and highlight the role hydrologic regime plays in bottomland succession and productivity. Across northern lower Michigan, late spring frost-induced cambial damage in jack pine (Pinus banksiana Lamb.) occurred more frequently in younger trees and in trees with smaller diameters. Biotic and abiotic factors were found to influence the occurrence of earlywood frost rings. Frequent occurrences of frost-rings can be used to identify frost-prone environments and geographical boundaries for plant species. This dissertation bridged gaps in knowledge of recreational, hydrogeomorphic, and climatic disturbances in forested ecosystems which can be used to develop management strategies.
Ph. D.
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Glas, Michael, and 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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Gedda, Petrus. "Disturbances in production." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-69299.

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Yazdani, Saami Kaveh. "Geometry induced flow disturbances." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/10023.

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From clinical studies it is well known that atherosclerosis has preferred locations in the vascular system, primarily sited in the carotid arteries, coronary arteries, and in vessels supplying the lower extremities in the arterial system. In the vicinity of bifurcations flow tends to separate forming re-circulation regions. In addition, due to the pulsatile character of blood flow during the deceleration part of the cycle, the flow becomes unstable and transition to turbulence may occur. Vascular stents provide a novel method in treatment of atherosclerotic vessels. Although stents have dramatically decreased the re-stenosis rate of vessels compared to balloon-angioplasty, restenosis still occurs in 25-30% of coronary implanted stents. Understanding how stents influence flow patterns may lead to more hemodynamically compatible stent designs that alleviate thrombus formation and promote endothelialization. The first study employed time-resolved Digital Particle Image Velocimetry (DPIV) to compare the hemodynamic performance of two stents in a compliant vessel. The first stent was a rigid insert, representing an extreme compliance mismatch. The second stent was a commercially available nitinol stent with some flexural characteristics. DPIV showed that compliance mismatch promotes the formation of a ring vortex in the vicinity of the stent. Larger compliance mismatch increased both the size and residence time of the ring vortex, and introduced in-flow stagnation points. These results provide detailed quantitative evidence of the hemodynamic effect of stent mechanical properties. Better understanding of these characteristics will provide valuable information for modifying stent design in order to promote long-term In the second study, DPIV was utilized to explore the fluid dynamics phenomena in a symmetric compliant bifurcation. We studied the effects of the Womersley and the Reynolds numbers under pulsatile flow conditions. New insight of the fluid mechanics is revealed. The flow topology results indicate that the formation of coherent vortices in the vicinity of the bifurcation apex is governed by physical process that dictates the energy and strength of the formed vortices. This is manifested by the identification of a characteristic dimensionless time-scale that combines the impulsive vortex formation with the inertia of the unsteady flow.
Master of Science
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Frissell, Nathaniel A. "Ionospheric Disturbances: Midlatitude Pi2 Magnetospheric ULF Pulsations and Medium Scale Traveling Ionospheric Disturbances." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/74976.

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The ionosphere is an electrically charged atmospheric region which is coupled to the sun, the magnetosphere, and the neutral atmosphere. The ionospheric state can significantly impact technological systems, especially those which utilize radio frequency energy. By studying ionospheric disturbances, it is possible to gain a deeper understanding of not only the ionosphere itself, but also the natural and technological systems it is coupled to. This dissertation research utilizes high frequency (HF) radio remote sensing techniques to study three distinct types of ionospheric disturbances. First, ground magnetometers and a new mid latitude SuperDARN HF radar at Blackstone, Virginia are used to observe magnetospheric Pi2 ultra low frequency (ULF) pulsations in the vicinity of the plasmapause. Prior to these pulsations, two Earthward moving fast plasma flows were detected by spacecraft in the magnetotail. Signatures of inner magnetospheric compression observed by the Blackstone radar provide conclusive evidence that the plasma flow bursts directly generated the ground Pi2 signature via a compressional wave. This mechanism had previously been hypothesized, but never confirmed. Next, ten SuperDARN radars in the North American Sector are used to investigate the sources and characteristics of atmospheric gravity waves (AGW) associated medium scale traveling ionospheric disturbances (MSTIDs) at both midlatitudes and high latitudes. Consistent with prior studies, the climatological MSTID population in both latitudinal regions was found to peak in the fall and winter and have a dominant equatorward propagation direction. Prior studies suggested these MSTIDs were caused by mechanisms associated with auroral and space weather activity; however, it is shown here that the AE and Sym-H indices are poorly correlated with MSTID observations. A new, multi-week timescale of MSTID activity is reported. This leads to the finding that MSTID occurrence is highly correlated with an index representative of polar vortex activity, possibly controlled by a filtering mechanism that is a function of stratospheric neutral wind direction. Finally, a case study of a radio blackout of transionospheric HF communications caused by an X2.9 class solar flare is presented. This study demonstrates the potential of a novel technique employing signals of opportunity and automated receiving networks voluntarily created by an international community of amateur radio operators.
Ph. D.
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Taylor, Diana L. "A nursing intervention for perimenstrual turmoil : a longitudinal therapeutic trial /." Thesis, Connect to this title online; UW restricted, 1988. http://hdl.handle.net/1773/7235.

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Karlsson, Berndt. "Metabolic disturbances in shift workers." Doctoral thesis, Umeå : Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-242.

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Nedic, Dusko P. "Simulation of large system disturbances." Thesis, University of Manchester, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488379.

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Rose, Sarah Jane. "Spider Community Response to Disturbances." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492759846303432.

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Dogwiler, Toby J. "Fluvial disturbances in karst streams /." free to MU campus, to others for purchase, 2002. http://wwwlib.umi.com/cr/mo/fullcit?p3060093.

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Books on the topic "Disturbances"

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Disturbances. Boise, Idaho: Ahsahta Press, 1990.

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Domestic disturbances. Boulder, CO: Subito Press, 2013.

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Galchen, Rivka. Atmospheric disturbances. New York: Farrar, Straus and Giroux, 2008.

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Chuar disturbances. Kolkata: Sreejoni, 2015.

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Atmospheric disturbances. New York: Farrar, Straus and Giroux, 2008.

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Charles, Garry. Tranquil disturbances. United States]: Skullvines Press, 2011.

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Howe, Tina. Coastal disturbances. New York: S. French, 1987.

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Atmospheric disturbances. Waterville, Me: Thorndike Press, 2008.

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Young, Patrick. Mental disturbances. New York: Chelsea House Publishers, 1988.

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Young, Patrick. Mental disturbances. New York: Chelsea House Publishers, 1988.

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Book chapters on the topic "Disturbances"

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Jentsch, Anke, Rupert Seidl, and Thomas Wohlgemuth. "Disturbances and Disturbance Regimes." In 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." In 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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Seidl, Rupert, Marie-Josée Fortin, Juha Honkaniemi, and Melissa Lucash. "Modeling Natural Disturbances in Boreal Forests." In 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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Morris, Kirsten A. "Disturbances." In Controller Design for Distributed Parameter Systems, 155–90. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34949-3_5.

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Shorohova, Ekaterina, Tuomas Aakala, Sylvie Gauthier, Daniel Kneeshaw, Matti Koivula, Jean-Claude Ruel, and Nina Ulanova. "Natural Disturbances from the Perspective of Forest Ecosystem-Based Management." In 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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De Backer, D. "Macrocirculatory Disturbances." In Update in Intensive Care and Emergency Medicine, 239–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/3-540-30328-6_16.

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Leitz, Mary Ann. "Sleep Disturbances." In Handbook of Gerontology, 230–43. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118269640.ch9.

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Dallenbach-Hellweg, Gisela, Dietmar Schmidt, and Friederike Dallenbach. "Circulatory Disturbances." In Atlas of Endometrial Histopathology, 53–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-01541-0_5.

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Dallenbach-Hellweg, Gisela, Dietmar Schmidt, and Friederike Dallenbach. "Functional Disturbances." In Atlas of Endometrial Histopathology, 59–108. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-01541-0_6.

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Meltzer, Lisa J., and Jocelyn R. Helwig. "Sleep Disturbances." In Encyclopedia of Adolescence, 2726–34. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-1695-2_98.

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Conference papers on the topic "Disturbances"

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Juntawongso, Jessada, Chuan Feng Zang, Kotaro Hashikura, Takaaki Suzuki, and Kou Yamada. "Disturbance observers for constant disturbances." In 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, and Kou Yamada. "Disturbance observers for general exogenous disturbances." In 2019 IEEE International Conference on Mechatronics and Automation (ICMA). IEEE, 2019. http://dx.doi.org/10.1109/icma.2019.8816576.

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Phan, Minh Q., Neil E. Goodzeit, and Jer-Nan Juang. "Identification of System and Periodic Disturbances." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4256.

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Abstract This paper addresses the problem of system identification in the presence of unknown periodic disturbances. Available for identification is a set of excitation input and the disturbance-corrupted response. This paper shows that the excitation-to-output system dynamics can still be identified successfully with disturbance-corrupted data in a manner analogous to the case when there is no disturbance present. This input-output domain derivation is in agreement with a similar result previously derived in the state-space domain. Criteria to distinguish the disturbances from system dynamics are discussed. A detailed analysis of experimental data obtained from a structural acoustic test setup is used to support the theoretical results.
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Chung, Meng-Hsuan, and Andrew M. Wo. "Navier-Stokes and Potential Calculations of Axial Spacing Effect on Vortical and Potential Disturbances and Gust Response in an Axial Compressor." In 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, and Joshua Vaughan. "Effect of Short-Term Weather Predictions on Model Predictive Trajectory Tracking Performance of Unmanned Surface Vessels." In 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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Wang, Yeqin, Yiting Dong, Jiguo Dai, Beibei Ren, and Qing-Chang Zhong. "Error Dynamics Design via a Repetitive Loop for UDE-Based Robust Control to Reject Periodic Disturbances." In ASME 2020 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/dscc2020-3221.

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Abstract The uncertainty and disturbance estimator (UDE)-based robust control has a two-degree-of-freedom nature through the design of the error dynamics and the design of the UDE filters. In the conventional design to handle periodic disturbances or mixed sinusoidal disturbances, high-order UDE filters incorporated with the internal model principle (IMP) or time-delay filters (TDF) are adopted to achieve the asymptotic reference tracking and the asymptotic disturbance rejection. In this paper, a new error dynamics design combined with a repetitive loop is proposed for the UDE-based robust control to achieve the asymptotic rejection of both step disturbances and periodic disturbances. The disturbance rejection performance is investigated through the two-degree-of-freedom nature, and the practical implementation of the proposed design is illustrated to eliminate the infinite bandwidth of the repetitive loop. The proposed design is validated through the simulation studies of a battery charging system with comparison to different reported designs of the conventional UDE-based robust control.
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Yan, Wei, Huan Zhang, Zhi-ming Mao, Chao Yin, Chen-kai Zhang, and Jun Hu. "Experimental Investigation of Compressor Aerodynamic Instability Induced by Rotating Disturbance." In 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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Mishra, Sandipan, Manabu Yamada, and Masayoshi Tomizuka. "Repetitive Control for Rejection of Periodic Multiplicative Disturbances and Adaptive Identification of the Unknown Period." In 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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Li, Haifeng, Shihua Li, and Yunda Yan. "Disturbance observer based MPC for PMSM with multiple disturbances." In 2023 IEEE International Conference on Predictive Control of Electrical Drives and Power Electronics (PRECEDE). IEEE, 2023. http://dx.doi.org/10.1109/precede57319.2023.10174295.

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Orzechowski, Pawel K., Steve Gibson, and Tsu-Chin Tsao. "Disturbance Rejection by Optimal Feedback Control in a Laser Beam Steering System." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60253.

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This paper presents an optimal control design and experimental implementation for pointing and disturbance rejection in a laser steam steering system. The linear quadratic Gaussian (LQG) controller, which includes a stochastic disturbance model, as well as integral action, was designed and implemented to compensate for disturbances due to atmospheric turbulence in the optical path and mechanical vibration of the laser and optical components. The control design also considers the situation where the stochastic disturbances applied to the two beam axes are correlated and renders a multi-input-multi-output (2-by-2) output feedback controller. The experimental system consists of a two-axis tilt mirror driven by piezo-electric actuators for controlling the laser beam, a second actuated tilt mirror to generate disturbances, a position sensing device that senses the location of the beam on a target plane, and a real time computer for digital control. System identification is used to determine a state space model of the beam steering system for use in control system design. Experimental results are presented to demonstrate the effectiveness of the LQG optimal disturbance rejection for the prescribed stochastic disturbances.
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Reports on the topic "Disturbances"

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Scherrer, Philip H., and J. T. Hoeksema. Geomagnetic Disturbances. Fort Belvoir, VA: Defense Technical Information Center, September 1997. http://dx.doi.org/10.21236/ada628512.

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Scherrer, Philip H., and Xuepu Zhao. Geomagnetic Disturbances. Fort Belvoir, VA: Defense Technical Information Center, September 2003. http://dx.doi.org/10.21236/ada629098.

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Primiceri, Giorgio, Ernst Schaumburg, and Andrea Tambalotti. Intertemporal Disturbances. Cambridge, MA: National Bureau of Economic Research, May 2006. http://dx.doi.org/10.3386/w12243.

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Scherrer, Philip H., and Xuepu Zhao. Geomagnetic Disturbances. Fort Belvoir, VA: Defense Technical Information Center, August 2002. http://dx.doi.org/10.21236/ada626261.

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Standler, Ronald B., and A. C. Canike. Mitigation of Mains Disturbances. Fort Belvoir, VA: Defense Technical Information Center, November 1987. http://dx.doi.org/10.21236/ada192502.

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Jumper, Eric J. Propagating Potential Disturbances in Turbomachinery. Fort Belvoir, VA: Defense Technical Information Center, March 2002. http://dx.doi.org/10.21236/ada400117.

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Samelson, Roger M., and Audrey M. Rogerson. Dynamics of Forced Coastal Trapped Disturbances. Fort Belvoir, VA: Defense Technical Information Center, March 1999. http://dx.doi.org/10.21236/ada360702.

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Duff, James W., and Fritz Bien. Research into Artificially Induced Atmospheric Disturbances. Fort Belvoir, VA: Defense Technical Information Center, June 1996. http://dx.doi.org/10.21236/ada324892.

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Cúrdia, Vasco, and Ricardo Reis. Correlated Disturbances and U.S. Business Cycles. Cambridge, MA: National Bureau of Economic Research, February 2010. http://dx.doi.org/10.3386/w15774.

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Stockman, Alan. Price Contracts, Output, and Monetary Disturbances. Cambridge, MA: National Bureau of Economic Research, June 1986. http://dx.doi.org/10.3386/w1960.

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