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Готові списки джерел за темами / Degree of disturbance / Статті в журналах

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Статті в журналах з теми "Degree of disturbance"

Автор: Grafiati

Опубліковано: 28 травня 2022

Оновлено: 31 липня 2025

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1

Farmer, Warren J., and Arnold J. Rix. "The Network Topology Metrics Contributing to Local-Area Frequency Stability in Power System Networks." Energies 14, no. 15 (2021): 4643. http://dx.doi.org/10.3390/en14154643.

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The power system network topology influences the system frequency response to power imbalance disturbances. Here, the objective is to find the network metric(s) contributing to frequency transient stability. The graph Laplacians of six 4-node network topologies are analysed using Spectral Graph Theory. For homogeneous network connections, we show that the node degree measure indicates node robustness. Based on these analytical results, the investigation expands to a 10-node network topology consisting of two clusters, which provide further insight into the spectral results. The research then i

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2

Sukkarnkha, Pisit, and Chanin Panjapornpon. "Two-degree-of-freedom Controller Design for Uncertain Processes Using Input/output Linearization Control Technique." ASEAN Journal of Chemical Engineering 11, no. 1 (2011): 16. http://dx.doi.org/10.22146/ajche.50039.

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In this work, a new control method for uncertain processes is developed based on two-degree-of-freedom control structure. The setpoint tracking controller designed by input/output linearization technique is used to regulate the disturbance-free output and the disturbance rejection controller designed is designed by high-gain technique. The advantage of two-degree-of-freedom control structure is that setpoint tracking and load disturbance rejection controllers can be designed separately. Open-loop observer is applied to provide disturbance-free response for setpoint tracking controller. The pro

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3

Wen, Jian-Ping, Bing-Gang Cao, and Jun-Yi Cao. "Robust ESO Two-Degree-of-Freedom Control Design for Permanent Magnet Synchronous Motor." Mathematical Problems in Engineering 2010 (2010): 1–10. http://dx.doi.org/10.1155/2010/405251.

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A robust two-degree-of-freedom control scheme is proposed for permanent magnet synchronous motor (PMSM) using extended state observer (ESO). The robustness is achieved based on the ESO. Parameter perturbation and external disturbances in PMSM drive system are treated as disturbance variable, and then the motion model of PMSM is transformed into an extended state model by introducing this disturbance variable. To estimate the disturbance variable, an ESO is constructed. Estimator is compensated into the control system to improve robustness and adaptability of 2DOF controller against parameter p

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4

Altun, Yusuf. "The road disturbance attenuation for quarter car active suspension system via a new static two-degree-of-freedom design." An International Journal of Optimization and Control: Theories & Applications (IJOCTA) 7, no. 2 (2017): 142–48. http://dx.doi.org/10.11121/ijocta.01.2017.00458.

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The main aim of this paper is to attenuate the effects of the road disturbance on the quarter-car active suspension system (ASS) for the passenger comfort by using design. Therefore, a new static disturbance compensator is proposed by using linear matrix inequality method such that the disturbance compensator and feedback controller are simultaneously designed for the disturbances in the linear time-invariant systems, which are measurable or predictable. They have static structure, and the disturbance compensator is designed on the feedforward path. The design is applied against the road distu

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5

Liu, Yong, Hugan Zhang, and Xianku Zhang. "Trajectory Tracking Control of Unmanned Underwater Vehicle Based on Projected Perpendicular Guidance Method with Disturbance Observer." Journal of Marine Science and Engineering 12, no. 6 (2024): 901. http://dx.doi.org/10.3390/jmse12060901.

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Unmanned underwater vehicles (UUVs) possess impressive maneuverability and versatility, but controlling them during trajectory tracking can be challenging due to their susceptibility to external disturbances and perturbations in their model parameters. Additionally, the UUV has four degrees of freedom underwater, but only three control inputs, making it a typical underactuated system. To address these issues, this paper introduces a novel optimize sliding mode control (OPSMC) algorithm grounded in projected perpendicular guidance (PPG). The PPG algorithm transforms the three-degree-of-freedom

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6

Tang, Y., and R. G. Boutilier. "Correlation between catecholamine release and degree of acidotic stress in trout." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 255, no. 3 (1988): R395—R399. http://dx.doi.org/10.1152/ajpregu.1988.255.3.r395.

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Exhaustive exercise in freshwater (FW) and seawater (SW) rainbow trout resulted in a marked and acute increase of plasma catecholamines. Immediately after exercise, epinephrine and norepinephrine concentrations in FW trout were 69 and 15 times the resting level, respectively; in SW trout, they were 46 and 11 times the resting value, respectively. Over the 1st h of recovery, the magnitude of the catecholamine surge in FW animals was about twice that of their SW counterparts. Correlated with this was an extracellular pH disturbance in FW trout, which was approximately twice as severe as in SW tr

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7

Shi-Yao, Zhu, Li Dong-Xu, and Lei Yong-Jun. "Multi-degree-of-freedom vibration reduction strategy of the solar array drive system." Advances in Mechanical Engineering 13, no. 5 (2021): 168781402110154. http://dx.doi.org/10.1177/16878140211015475.

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The operation disturbance induced by the solar array drive system (SADS) and the residual vibration of solar array following the attitude adjustment of the spacecraft obviously affect the dynamics environment, quick stabilization, and attitude stability of the high-precision spacecraft. However, these two kinds of vibration disturbance are characterized by distinct vibration categories, direction of vibration, and modal shapes. A multi-degree-of-freedom vibration reduction strategy (VRS) was presented to improve the dynamic characteristics of SADS and then to weaken these disturbances syntheti

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8

Huang, Hong Cheng, Yi Zhang, and Heng Deng. "Disturbance Observer in Robust DC Motor Control." Applied Mechanics and Materials 614 (September 2014): 219–23. http://dx.doi.org/10.4028/www.scientific.net/amm.614.219.

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The disturbance observer is a specific method of designing a two degree of freedom control structure to achieve insensitivity to modeling error and disturbance rejection. It has been successfully applied in a variety of motion control applications. In motion control, the major sources of uncertainties are friction, inertia, and external disturbances. These uncertainties should be taken into account by any robust motion controller. In this paper, this element is a PD (proportional-derivative) controller. The disturbance observer proves its advantages through the simulation and experiments. With

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9

Melkumyan, Karine, Darshan Shingala, Syuzanna Simonyan, et al. "Assessment of Smell and Taste Disturbances among COVID-19 Convalescent Patients: A Cross-Sectional Study in Armenia." Journal of Clinical Medicine 11, no. 12 (2022): 3313. http://dx.doi.org/10.3390/jcm11123313.

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Background and Objectives: Neurological manifestations of Coronavirus Disease 2019 (COVID-19) such as olfactory and gustatory disturbance have been reported among convalescent COVID-19 patients. However, scientific data on the prevalence of smell and taste disturbance are lacking. Therefore, we present findings on the degree of smell and taste disturbances among the Armenian population. Methods: Study participants were randomly recruited and then categorized into two groups based on their course of the disease. A cross-sectional study was performed to assess participants’ sensitivity to smell

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10

Jing, Yutao, Xianghe Wang, Juan Heredia-Juesas, et al. "PX4 Simulation Results of a Quadcopter with a Disturbance-Observer-Based and PSO-Optimized Sliding Mode Surface Controller." Drones 6, no. 9 (2022): 261. http://dx.doi.org/10.3390/drones6090261.

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This work designed a disturbance-observer-based nonlinear sliding mode surface controller (SMC) and validated the controller using a simulated PX4-conducted quadcopter. To achieve this goal, this research (1) developed a dynamic mathematical model; (2) built a PX4-based simulated UAV following the model-based design process; (3) developed appropriate sliding mode control laws for each degree of freedom; (4) implemented disturbance observers on the proposed SMC controller to achieve finer disturbance rejection such as crosswind effect and other mutational disturbances; (5) optimized the SMC con

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11

Uchaev, Dm V., D. V. Uchaev, and O. N. Malinnikova. "Assessing the degree of coal tectonic disturbance by multifractal analysis of scanning electron microscopy images of coal specimen surfaces." IOP Conference Series: Earth and Environmental Science 990, no. 1 (2022): 012062. http://dx.doi.org/10.1088/1755-1315/990/1/012062.

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Abstract The application of a multifractal approach to assessing the degree of coal disturbance is shown using a series of 2D model configurations of coals and scanning electron microscopy (SEM) images of coal specimen surfaces. For this, multifractal spectra, also called multifractal signatures, are used, which are suitable for a comprehensive description of the structural organization of the surface of coals with different degrees of disturbance. It is shown that maximum values of the multifractal signatures can be used to assess the degree of coal disturbance, and higher values of the param

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12

Hu, Yang, Boyang Li, Bailun Jiang, Jixuan Han, and Chih-Yung Wen. "Disturbance Observer-Based Model Predictive Control for an Unmanned Underwater Vehicle." Journal of Marine Science and Engineering 12, no. 1 (2024): 94. http://dx.doi.org/10.3390/jmse12010094.

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This work addresses the motion control problem for a 4-degree-of-freedom unmanned underwater vehicle (UUV) in the presence of nonlinear dynamics, parametric uncertainties, system constraints, and time-varying external disturbances. A disturbance observer-based control scheme is proposed, which is structured around the model predictive control (MPC) method integrated with an extended active observer (EAOB). Compared to the conventional disturbance observer, the developed EAOB has the ability to handle both external disturbances and system/measurement noises simultaneously. The EAOB leverages a

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13

Chaves Cardoso, Jéssica, Philip J. Burton, and Che M. Elkin. "A Disturbance Ecology Perspective on Silvicultural Site Preparation." Forests 11, no. 12 (2020): 1278. http://dx.doi.org/10.3390/f11121278.

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Silvicultural site preparation methods are used as planned disturbances for counteracting soil and vegetation constraints, as well as facilitating successful tree regeneration and growth. Understanding the possible effects of silvicultural site preparation on the ecosystem and evaluating site preparation as an ecological disturbance can help guide the selection and application of site preparation techniques for forest management goals. This review evaluates silvicultural site preparation techniques that are commonly used in boreal mixedwood ecosystems as agents of ecological disturbance by com

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14

Silvestri, Vincenzo. "Disturbance effects in pressuremeter tests in clay." Canadian Geotechnical Journal 41, no. 4 (2004): 738–59. http://dx.doi.org/10.1139/t04-019.

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This paper analyzes the effect of borehole disturbance, caused by installation of pressuremeter probes in clays, on the derived stressstrain curves. Both overpushing- and overcutting-induced disturbances are considered. It is shown that overpushing results in underestimation of the undrained shear resistance. In general, the degree of underestimation cannot be determined. As for overcutting, the derived stressstrain curves are characterized by high peak strengths. The degree of overestimation of the undrained shear strength may reach 100% for the case of a strain-hardening material. Determin

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15

Yang, Jun, Wen-Hua Chen, Shihua Li, and Xisong Chen. "Static disturbance-to-output decoupling for nonlinear systems with arbitrary disturbance relative degree." International Journal of Robust and Nonlinear Control 23, no. 5 (2011): 562–77. http://dx.doi.org/10.1002/rnc.1850.

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16

Lugo, Ariel E. "Effects of Extreme Disturbance Events: From Ecesis to Social–Ecological–Technological Systems." Ecosystems 23, no. 8 (2020): 1726–47. http://dx.doi.org/10.1007/s10021-020-00491-x.

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AbstractEcologists addressed the effects of disturbances from the onset of the field by focusing on ecesis, which is the process by which organisms migrate and establish under the environmental conditions created by disturbances. Ecesis is the onset of succession, a self-organizing process whose nature, speed, and outcome depend in part on the outcomes of ecesis and the residual legacies remaining after disturbances. A by-product of succession after a disturbance is the reorganization of species dominance, or novelty. The degree of novelty in the outcome increases with the severity of the dist

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17

Mason, Leanda Denise, Grant Wardell-Johnson, and Barbara York Main. "Quality not quantity: conserving species of low mobility and dispersal capacity in south-western Australian urban remnants." Pacific Conservation Biology 22, no. 1 (2016): 37. http://dx.doi.org/10.1071/pc15044.

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Urban remnant vegetation is subject to varying degrees of disturbance that may or may not be proportional to the size of the patch. The impact of disturbance within patches on species with low mobility and dispersal capabilities was investigated in a survey targeting nemesiid species of the mygalomorph spider clade in the Perth metropolitan area, south-western Australia. Nemesiid presence was not influenced by patch size, but presence did negatively correlate with higher degrees of invasive grass and rabbit disturbance. Further, patch size was significantly positively correlated with degree of

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18

Sun, Zhenxing, Yangkun Zhang, Shenghui Li, and Xinghua Zhang. "Decentralized robust tracking control for 2-degree of freedom planar robot manipulator subject to disturbances and uncertainties." Transactions of the Institute of Measurement and Control 41, no. 14 (2019): 3909–20. http://dx.doi.org/10.1177/0142331219841426.

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In this study, a novel decentralized exact tracking control approach for 2-degree of freedom (DOF) planar robot manipulators with disturbances and uncertainties has been proposed. The main idea of the proposed method is to partition the whole robot manipulator into single joint and lumped disturbance. A well designed extended high gain observer (EHGO) is adopted to observe the lumped disturbance of each joint, which includes coupling, load disturbance and uncertainty, and so forth. Rather than coping with the robot manipulator as a whole, the proposed method is locally designed to compensate t

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19

Hamoudi, Ahmed Khalaf, and Suha S. Husain. "Design of Adaptive Synergetic Controller for One Degree of Freedom Robotic ARM Under External Disturbance." Journal of Robotics and Control (JRC) 6, no. 1 (2025): 406–12. https://doi.org/10.18196/jrc.v6i1.25207.

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In order to manage a one-link robot arm, this research proposes a unique control architecture based on the Synergetic Control (SC) principle. The synergetic control design is initially developed using known system parameters and subjected to external disturbances. However, in practical robotic systems, uncertainties are inherent in the system parameters. As a result, an algorithm known as Adaptive Synergetic Control (ASC) is presented and developed for a robot arm that encounters parameters uncertainty. To estimate disturbances and guarantee the asymptotic stability of the monitored system, ad

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20

Ma, Youjie, Luyong Yang, Xuesong Zhou, Xia Yang, Yongliang Zhou, and Bo Zhang. "Linear Active Disturbance Rejection Control for DC Bus Voltage Under Low-Voltage Ride-Through at the Grid-Side of Energy Storage System." Energies 13, no. 5 (2020): 1207. http://dx.doi.org/10.3390/en13051207.

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The energy storage inverter system has the characteristics of nonlinearity, strong coupling, variable parameters, and flexible mode switching between parallel and off grid. In order to improve the control performance of the grid-side inverter of the energy storage system, an improved Linear Active Disturbance Rejection Control (LADRC) based on proportional differentiation is proposed to replace the traditional LADRC in the voltage outer loop control. In this paper, the observation gain coefficient of the sum of the disturbances of the traditional Linear Extended State Observer (LESO) is improv

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21

Talukder, N., J. T. Fulenwider, R. F. Mabon, and D. P. Giddens. "Poststenotic Flow Disturbance in the Dog Aorta as Measured With Pulsed Doppler Ultrasound." Journal of Biomechanical Engineering 108, no. 3 (1986): 259–65. http://dx.doi.org/10.1115/1.3138612.

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Blood flow velocity was measured in the dog aorta distal to mechanically induced constrictions of various degrees of severity employing an 8-MHz pulsed Doppler ultrasound velocimeter and a phase-lock loop frequency tracking method for extracting velocity from the Doppler quadrature signals. The data were analyzed to construct ensemble average velocity waveforms and random velocity disturbances. In any individual animal the effect of increasing the degree of stenosis beyond approximately 25 percent area reduction was to produce increasing levels of random velocity disturbance. However, variabil

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22

Kuroe, Yasuaki, and Hsin-Nan Lin. "Variable-Structure Disturbance Observer for Decoupling Control of Robot Manipulators." Journal of Robotics and Mechatronics 8, no. 3 (1996): 259–65. http://dx.doi.org/10.20965/jrm.1996.p0259.

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In recent years, disturbance observers have been used extensively for decoupling control of robot manipulators. But the conventional disturbance observers are sometimes useless for decoupling control because they are usually constructed under the assumption that the disturbance is constant during the sampling period. Therefore the trade-off between decay rate of the estimation error and the sensitivity to sensor noise becomes inevitable problem. In this paper we propose a variable-structure disturbance observer for decoupling and linearizing control of robot manipulators. The proposed observer

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23

Toscano, Pietro, Maurizio Cutini, Alex Filisetti, et al. "Workability Assessment of Different Stony Soils by Soil–Planter Interface Noise and Acceleration Measurement." AgriEngineering 4, no. 4 (2022): 1139–52. http://dx.doi.org/10.3390/agriengineering4040070.

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Sowing is critical for successful crop establishment and productivity, particularly in precision agriculture management strategies. However, topsoil characteristics directly affect agribusiness maximization (i.e., crop-yield increase, machinery efficiency, operating-cost reduction) even in the most advanced farming management techniques. The excessive presence of coarse fractions or stones in arable soil layers prevents modern machinery from reaching optimal efficiency. This work focuses on sowing to verify whether the vibration and noise arising during this operation significantly change with

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24

Napit, R., and P. K. Paudel. "Response of natural forest regeneration to human disturbance in Banke National Park." Banko Janakari 25, no. 1 (2015): 39–49. http://dx.doi.org/10.3126/banko.v25i1.13470.

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Tropical forest continues to decline in Nepal’s lowlands, with a serious negative consequence for biodiversity conservation. Even a strict natural reserve is subjected to have some degree of human disturbances. The newly established Banke National Park of Nepal provides an excellent context to evaluate effects of human disturbances on the forest regeneration status. This article assesses the regeneration status of the park. A total of 1,067 plots were laid out within the park area. In each plot, three concentric rings of radii of 10 m, 5 m, and 1 m were established. Data of seedling/sapling an

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25

Malinnikova, Olga, Dmitry Uchaev, Denis Uchaev, Vasiliy Malinnikov, and Catherine Ulyanova. "“Complexity–entropy” diagrams and their application to the study of coal tectonic disturbance." E3S Web of Conferences 129 (2019): 01016. http://dx.doi.org/10.1051/e3sconf/201912901016.

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It is investigated the possibility of using so–called "complexity–entropy" diagrams for the quantitative description of the degree of coal disturbance using coal images obtained by means of scanning electron microscope (SEM). These diagrams plot structural complexity measure (vertical axis) versus entropy measure (horizontal axis) for distribution of probability given in some way on the image. In this paper, the values of both measures were calculated on the basis of the shearlet transform, and the Jensen divergence was used as the basic divergence for calculating the complexity measure. All c

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26

Huang, Chunwen, and Gang Ji. "The research of vibration localization under strong disturbances using modal analysis methods." Journal of Physics: Conference Series 2790, no. 1 (2024): 012010. http://dx.doi.org/10.1088/1742-6596/2790/1/012010.

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Abstract Vibration localization is a typical feature of aperiodic structures. This work investigates the vibration localization of framed cylindrical shells with a high disturbance degree. First, the spring oscillator system is considered an example to reveal the general law governing how high disturbance degree influences the vibration transmission in a structure. Then the strong localization coefficient is calculated using the modal analysis method. Finally, the conclusions of the one-dimensional systems are applied to the two-dimensional structures based on the passband approximation equiva

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27

V., B. Rodrigues F. M. Jesus R. I. Campos. "Local habitat disturbance increases bird nest predation in the Brazilian Atlantic rainforest." Animal Biodiversity and Conservation 41, no. 1 (2017): 117–20. https://doi.org/10.5281/zenodo.1230505.

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<strong>Abstract</strong> Local habitat disturbance increases bird nest predation in the Brazilian Atlantic rainforest. We evaluated the effectof  anthropogenic disturbance on nest predation in Brazilian Atlantic forest. Artificial nests were distributed in fragments with distinct degrees of anthropogenic disturbance. We found a higher proportion of egg predation on the ground and in the fragments classified as 'high' and 'medium' disturbance than in the fragments classified as 'low' degree of disturbance. The higher egg predation is probably linked to low structur

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28

Duan, Rong, Siqi Wang, Ya Liu, Wei Yan, Zhigang Jiang, and Zhiqiang Pan. "A Multi-Trigger Mechanism Design for Rescheduling Decision Assistance in Smart Job Shops Based on Machine Learning." Sustainability 17, no. 5 (2025): 2198. https://doi.org/10.3390/su17052198.

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The empowerment of lean intelligent manufacturing technologies has provided a solid foundation for enterprises to achieve a balance between economic benefits and sustainable development. In production workshops, various disruptive factors, especially in multi-variety small-batch production environments, often lead to deviations from the planned schedule. This creates an urgent need to enhance the workshop’s dynamic responsiveness and self-regulation capabilities. Existing single-trigger mechanisms in job shops focus on changes in overall performance or deviations from production goals but lack

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29

Wang, Ziqiang, and Jian Hu. "Adaptive RBF iterative learning tracking control of multi-degree-of-freedom manipulators." Journal of Physics: Conference Series 2902, no. 1 (2024): 012046. https://doi.org/10.1088/1742-6596/2902/1/012046.

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Abstract Targeting on the issue of poor dynamic performance of multi-degree-of-freedom manipulator system under disturbance environment and model parameter uncertainty, this paper designs an adaptive iterative learning tracking control method utilizing a radial basis function (RBF) neural network observer, aiming at realizing stable control and disturbance suppression of closed-loop system. The controller consists of the proportional-differential term based on the backstepping method, the sign function robust term of adaptive sliding mode, and the disturbance observation term of the RBF neural

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30

Vázquez, Diego P., and Daniel Simberloff. "Ecological Specialization and Susceptibility to Disturbance: Conjectures and Refutations." American Naturalist 159, no. 6 (2002): 606–23. https://doi.org/10.5281/zenodo.13509059.

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Анотація:

(Uploaded by Plazi for the Bat Literature Project) Niche breadth of species has been hypothesized to be associated with species' responses to disturbance. Disturbance is usually believed to affect specialists negatively, while generalists are believed to benefit from disturbance; we call this the "specializationdisturbance" hypothesis. We also propose an associated hypothesis (the "specialization-asymmetry-disturbance" hypothesis) under which both specialization and asymmetry of interactions would explain species' responses to disturbance. We test these hypotheses using data from a plant-polli

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31

Vázquez, Diego P., and Daniel Simberloff. "Ecological Specialization and Susceptibility to Disturbance: Conjectures and Refutations." American Naturalist 159, no. 6 (2002): 606–23. https://doi.org/10.5281/zenodo.13509059.

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Анотація:

(Uploaded by Plazi for the Bat Literature Project) Niche breadth of species has been hypothesized to be associated with species' responses to disturbance. Disturbance is usually believed to affect specialists negatively, while generalists are believed to benefit from disturbance; we call this the "specializationdisturbance" hypothesis. We also propose an associated hypothesis (the "specialization-asymmetry-disturbance" hypothesis) under which both specialization and asymmetry of interactions would explain species' responses to disturbance. We test these hypotheses using data from a plant-polli

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32

Vázquez, Diego P., and Daniel Simberloff. "Ecological Specialization and Susceptibility to Disturbance: Conjectures and Refutations." American Naturalist 159, no. 6 (2002): 606–23. https://doi.org/10.5281/zenodo.13509059.

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Анотація:

(Uploaded by Plazi for the Bat Literature Project) Niche breadth of species has been hypothesized to be associated with species' responses to disturbance. Disturbance is usually believed to affect specialists negatively, while generalists are believed to benefit from disturbance; we call this the "specializationdisturbance" hypothesis. We also propose an associated hypothesis (the "specialization-asymmetry-disturbance" hypothesis) under which both specialization and asymmetry of interactions would explain species' responses to disturbance. We test these hypotheses using data from a plant-polli

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33

Vázquez, Diego P., and Daniel Simberloff. "Ecological Specialization and Susceptibility to Disturbance: Conjectures and Refutations." American Naturalist 159, no. 6 (2002): 606–23. https://doi.org/10.5281/zenodo.13509059.

Повний текст джерела

Анотація:

(Uploaded by Plazi for the Bat Literature Project) Niche breadth of species has been hypothesized to be associated with species' responses to disturbance. Disturbance is usually believed to affect specialists negatively, while generalists are believed to benefit from disturbance; we call this the "specializationdisturbance" hypothesis. We also propose an associated hypothesis (the "specialization-asymmetry-disturbance" hypothesis) under which both specialization and asymmetry of interactions would explain species' responses to disturbance. We test these hypotheses using data from a plant-polli

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TIE, Junbo, Meiping WU, Juliang Cao, Junxiang Lian, Shaokun Cai, and Lin Wang. "The Optimal Degree of Gravity Spherical Harmonic Model Calculation for Gravity Disturbance Compensation in Inertial Navigation." MATEC Web of Conferences 160 (2018): 07004. http://dx.doi.org/10.1051/matecconf/201816007004.

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In recent years, the significant improvement of inertial navigation, leaves the gravity disturbance as the important factor which affects the accuracy of inertial navigation. This paper focus on the compensation for gravity disturbance with gravity spherical harmonic model, especially the optimal degree of gravity spherical harmonic model with which to calculate the gravity disturbance. The effect of gravity disturbance on inertial navigation is analysed based on the amplitude-frequency response characteristics of inertial navigation error differential equation, then the dominantly influential

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Zarnaghsh, Amirreza, and Admin Husic. "Degree of Anthropogenic Land Disturbance Controls Fluvial Sediment Hysteresis." Environmental Science & Technology 55, no. 20 (2021): 13737–48. http://dx.doi.org/10.1021/acs.est.1c00740.

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Kang, O., Y. Park, Y. S. Park, and M. Suh. "New Measure Representing Degree of Controllability for Disturbance Rejection." Journal of Guidance, Control, and Dynamics 32, no. 5 (2009): 1658–61. http://dx.doi.org/10.2514/1.43864.

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Thom, Dominik, Werner Rammer, Rita Garstenauer, and Rupert Seidl. "Legacies of past land use have a stronger effect on forest carbon exchange than future climate change in a temperate forest landscape." Biogeosciences 15, no. 18 (2018): 5699–713. http://dx.doi.org/10.5194/bg-15-5699-2018.

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Abstract. Forest ecosystems play an important role in the global climate system and are thus intensively discussed in the context of climate change mitigation. Over the past decades temperate forests were a carbon (C) sink to the atmosphere. However, it remains unclear to which degree this C uptake is driven by a recovery from past land use and natural disturbances or ongoing climate change, inducing high uncertainty regarding the future temperate forest C sink. Here our objectives were (i) to investigate legacies within the natural disturbance regime by empirically analyzing two disturbance e

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Przybyła, M., M. Kordasz, R. Madoński, P. Herman, and P. Sauer. "Active Disturbance Rejection Control of a 2DOF manipulator with significant modeling uncertainty." Bulletin of the Polish Academy of Sciences: Technical Sciences 60, no. 3 (2012): 509–20. http://dx.doi.org/10.2478/v10175-012-0064-z.

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Анотація:

Abstract This paper presents a practical verification of an Active Disturbance Rejection Control (ADRC) method in governing a multidimensional system. The experiments were conducted on a two degrees of a freedom planar manipulator with only partial knowledge about the mathematical model of the plant. This multi input multi output system was controlled with a set of two, independent, single input single output ADRC controllers, each regulating one of the manipulator degree of freedom. Modeling uncertainty (nonlinearities, cross-coupling effects, etc.) and external disturbances were assumed to b

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Qin, Wu, Wen-Bin Shangguan, and Kegang Zhao. "A research of sliding mode control method with disturbance observer combining skyhook model for active suspension systems." Journal of Vibration and Control 26, no. 11-12 (2019): 952–64. http://dx.doi.org/10.1177/1077546319890747.

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Based on a nonlinear two-degree-of-freedom model of active suspension systems, an approach of the sliding mode control with disturbance observer combining skyhook model sliding mode control with disturbance observer combining is proposed for improving the performance of active suspension systems, and the effectiveness of the proposed approach is validated by the active suspension system plant. Two problems of active suspension systems are solved by using the proposed approach when the tire is excited by the step displacement. One problem is that the suspension deflection of active suspension s

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40

Makarov, Georgy. "Offsets in the geomagnetic indices of the magnetospheric ring current." Solar-Terrestrial Physics 7, no. 3 (2021): 29–35. http://dx.doi.org/10.12737/stp-73202103.

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Анотація:

The paper considers changes in the daily average values of the Dst, SYM-H, ASY-H, and ASY-D indices and their dependence on the level of magnetic disturbance for the period 1981–2016. These indices are geomagnetic characteristics of the magnetospheric ring current. It has been established that the indices of the asymmetric component of the ring current ASY-H and ASY-D during relatively magnetically quiet periods are not equal to zero. The values of the offsets in the dependences of the ASY-H and ASY-D indices on the level of magnetic disturbance have been determined. The behavior of the index

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Makarov, Georgy. "Offsets in the geomagnetic indices of the magnetospheric ring current." Solnechno-Zemnaya Fizika 7, no. 3 (2021): 31–38. http://dx.doi.org/10.12737/szf-73202103.

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Анотація:

The paper considers changes in the daily average values of the Dst, SYM-H, ASY-H, and ASY-D indices and their dependence on the level of magnetic disturbance for the period 1981–2016. These indices are geomagnetic characteristics of the magnetospheric ring current. It has been established that the indices of the asymmetric component of the ring current ASY-H and ASY-D during relatively magnetically quiet periods are not equal to zero. The values of the offsets in the dependences of the ASY-H and ASY-D indices on the level of magnetic disturbance have been determined. The behavior of the index

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Wang, Jingyue, Haotian Wang, and Lixin Guo. "Analysis of Stochastic Nonlinear Dynamics in the Gear Transmission System with Backlash." International Journal of Nonlinear Sciences and Numerical Simulation 16, no. 2 (2015): 111–21. http://dx.doi.org/10.1515/ijnsns-2014-0089.

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AbstractIn order to study the different backlash, gear damping ratio and random disturbance on dynamic behavior of gear transmission system, stochastic dynamic equations of the three-degree-of-freedom spur gear transmission system are established considering random disturbances of a low-frequency external excitation induced by torque fluctuation, gear damping ratio, gear backlash, excitation frequency and meshing stiffness. Using bifurcation diagram, phase diagram, time course diagram, Poincaré map and power spectrum of the system, the dynamic characteristics of the gear transmission system wi

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Zhou, Chen-Yang, and Yan-Xia Shen. "A 2-DOF-IMC method for suppressing transmission chain vibration of wind power generation system with a clearance." Advances in Mechanical Engineering 14, no. 10 (2022): 168781322211323. http://dx.doi.org/10.1177/16878132221132387.

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To address the vibration problem caused by gear clearance in the wind drivetrain, a two-degree-of-freedom internal model control (2-DOF-IMC) method was proposed to suppress the clearance’s nonlinear vibration. The two-mass wind drivetrain with clearance is the object of this paper’s research. First, we discuss the nonlinear characteristics of gear clearance and the mechanism by which vibration occurs. The nonlinear clearance unit is then decomposed into a linear unit and a nonlinear bounded disturbance unit. A suppression disturbance method based on 2-DOF-IMC was proposed to address nonlinear

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Al-Khanini, Mona bint AbdulAziz. "Strategies to Confront the Marital Adjustment Disturbance as Practiced by Saudi Wives." Journal of Educational and Social Research 12, no. 3 (2022): 148. http://dx.doi.org/10.36941/jesr-2022-0074.

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The study aimed to explore the strategies practiced by Saudi wives to confront the marital adjustment disturbance. The study applied a three-part questionnaire that includes the degree of the marital adjustment disturbance, its causes, ramifications and strategies to confront it. Using the personal interview, data were collected from 230 wives in Riyadh city within three months. The study used the descriptive and analytical approach to analyze the collected data. The results indicated that there was a high degree of disturbance in the relationship between the couples. This is because of the we

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van der Woude, Sietse, Johannes Reiche, Frank Sterck, Gert-Jan Nabuurs, Marleen Vos, and Martin Herold. "Sensitivity of Sentinel-1 Backscatter to Management-Related Disturbances in Temperate Forests." Remote Sensing 16, no. 9 (2024): 1553. http://dx.doi.org/10.3390/rs16091553.

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The rapid and accurate detection of forest disturbances in temperate forests has become increasingly crucial as policy demands and climate pressure on these forests rise. The cloud-penetrating Sentinel-1 radar constellation provides frequent and high-resolution observations with global coverage, but few studies have assessed its potential for mapping disturbances in temperate forests. This study investigated the sensitivity of temporally dense C-band backscatter data from Sentinel-1 to varying management-related disturbance intensities in temperate forests, and the influence of confounding fac

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Ke, Shan, Hui Pan, and Bowen Jin. "Identification of Priority Areas for Ecological Restoration Based on Human Disturbance and Ecological Security Patterns: A Case Study of Fuzhou City, China." Sustainability 15, no. 3 (2023): 2842. http://dx.doi.org/10.3390/su15032842.

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The rapid increase in urbanization has brought about a great deal of ecological problems, and thus the systematic protection of the environment is vital. Ecological security patterns are important for maintaining regional ecological stability and sustainable urban development. Human disturbance is a key factor affecting the stability and sustainable development of ecosystems. This paper constructs an ecological security pattern and evaluates the degree of human disturbance in Fuzhou City. Through a comprehensive analysis of both of these factors, the ecological priority restoration areas in Fu

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47

Chang, Hui, Wen-Qi Ge, Hao-Cheng Wang, Hong Yuan, and Zhong-Wei Fan. "Laser Beam Pointing Stabilization Control through Disturbance Classification." Sensors 21, no. 6 (2021): 1946. http://dx.doi.org/10.3390/s21061946.

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In laser systems, beam pointing usually drifts as a consequence of various disturbances, e.g., inherent drift, airflow, transmission medium variation, mechanical vibration, and elastic deformation. In this paper, we develop a laser beam pointing control system with Fast Steering Mirrors (FSMs) and Position Sensitive Devices (PSDs), which is capable of stabilizing both the position and angle of a laser beam. Specifically, using the ABCD matrix, we analyze the kinematic model governing the relationship between the rotation angles of two FSMs and the four degree-of-freedom (DOF) beam vector. Then

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Ando, Yoshinori, Tatsuya Sakanushi, Kou Yamada, Iwanori Murakami, Takaaki Hagiwara, and Masahiko Kobayashi. "A Design Method for Two-Degree-of-Freedom Simple Multi-Period Repetitive Control Systems." Applied Mechanics and Materials 36 (October 2010): 243–52. http://dx.doi.org/10.4028/www.scientific.net/amm.36.243.

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The multi-period repetitive (MPR) control system is a type of servomechanism for periodic reference inputs. Using MPR controllers, transfer functions from the reference input to the output and from the disturbance to the output of the MPR control system have infinite numbers of poles. To specify the input-output characteristic and the disturbance attenuation characteristic easily, Yamada and Takenaga proposed MPR control systems, named simple multi-period repetitive (simple MPR) control systems, where these transfer functions have finite numbers of poles. In addition, Yamada and Takenaga clari

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Pati, A., V. C. Pal, and R. Negi. "Design of a 2-DOF Control and Disturbance Estimator for a Magnetic Levitation System." Engineering, Technology & Applied Science Research 7, no. 1 (2017): 1369–76. http://dx.doi.org/10.48084/etasr.986.

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This work proposes a systematic two-degree freedom control scheme to improve the reference input tracking and load disturbance rejection for an unstable magnetic levitation system. The proposed control strategy is a two-step design process. Firstly, a proportional derivative controller is introduced purposely to get the desired set-point response of the magnetic levitation system and then, an integral square error (ISE) performance specification is used for designing a set-point tracking controller. Secondly, a disturbance estimator is designed using the desired closed loop complimentary sensi

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Pati, A., V. C. Pal, and R. Negi. "Design of a 2-DOF Control and Disturbance Estimator for a Magnetic Levitation System." Engineering, Technology & Applied Science Research 7, no. 1 (2017): 1369–76. https://doi.org/10.5281/zenodo.291440.

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Анотація:

This work proposes a systematic two-degree freedom control scheme to improve the reference input tracking and load disturbance rejection for an unstable magnetic levitation system. The proposed control strategy is a two-step design process. Firstly, a proportional derivative controller is introduced purposely to get the desired set-point response of the magnetic levitation system and then, an integral square error (ISE) performance specification is used for designing a set-point tracking controller. Secondly, a disturbance estimator is designed using the desired closed loop complimentary sensi

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