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Автор: Grafiati
Опубліковано: 4 травня 2022
Оновлено: 5 травня 2022

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Статті в журналах з теми "Disturbance method":

1

Peng, Cong, and Jinji Sun. "Disturbance observer control method in SGMSCMG." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 11 (September 18, 2014): 1998–2006. http://dx.doi.org/10.1177/0954406214552306.

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To restrain disturbances produced by parameter variations and external disturbances in axial magnetic bearing in the application of single-gimbal magnetically suspended control moment gyro (SGMSCMG), a disturbance observer control method is proposed, which integrated [Formula: see text] controller and disturbance observer. This method considers parameter variations of the axial magnetic bearing and the effect of gimbals on axial magnetic bearing. Consequently, the state space equation is changed to include the disturbances. Then the robust controller is designed, which includes the disturbance observer design and robust [Formula: see text] controller design. The stability analysis is given for the proposed controller. Simulation and experiment results on the SGMSCMG verified the correctness of the proposed method.
2

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.
3

Peng, Fei Jin, Xiao Yun Huang, Hong Yuan Huang, and Zhi Wen Xie. "A Novel Power Quality Disturbances Detection and Classification Method." Applied Mechanics and Materials 737 (March 2015): 193–98. http://dx.doi.org/10.4028/www.scientific.net/amm.737.193.

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Power quality disturbance detection and identification is the prerequisite and basis for the power quality management and control. This paper presents a new power quality disturbance detection and classification method. Firstly, the time-time transform is applied to power quality disturbance signal analysis. According to spectrum analysis results of the diagonal elements of time-time transform matrix, a preliminary judge about whether the disturbance signal contains harmonics and inter harmonic was given. For disturbances with non-harmonics, based on time-time transform modulus matrix diagonal sequence, the beginning and ending time of the disturbance is located, and the disturbance amplitude is calculated. For the disturbances which contain harmonics, time-time transform is perform twice to get the row mean value curve and the column mean value curve, which are required by disturbance time location and amplitude measurement. Finally, disturbance classification had realized by using rule tree. Simulation results reveal that this method is very robust and adaptable, which can identify transient power quality disturbance with minor magnitude under noisy environment, and the recognition rate is satisfactory.
4

Zhou, Mei Han. "Urban Rail Traffic Organization Scheduling Adjustment Method." Applied Mechanics and Materials 433-435 (October 2013): 1361–65. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.1361.

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This paper studies on urban rail traffic organization scheduling adjustment method. It describes different kinds of disturbance events that may occur in metro operation, and analyzes how various disturbance affect traffic order. It points out that the essence of disturbance is breaking the balance between transport capacity and demand, and the fundamental purpose of scheduling adjustment is to re-match capacity and demand. Its helpful to choose the most reasonable solution that making various disturbances effects on traffic. Available and matching scheduling adjustment methods for different disturbance scenarios are expounded in the paper.
5

Deng, Jiuqiang, Wenchao Xue, Xi Zhou, and Yao Mao. "On disturbance rejection control for inertial stabilization of long-distance laser positioning with movable platform." Measurement and Control 53, no. 7-8 (July 8, 2020): 1203–17. http://dx.doi.org/10.1177/0020294020935492.

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This paper focuses on the disturbance rejection control problem for inertial stabilization of long-distance laser positioning with the movable platform. Due to various disturbances of the movable platform, the positioning system has significant disturbances that affect the positioning accuracy. Moreover, the nonminimum-phase property of the inertial stabilization system leads to great challenges for designing traditional disturbance-observer-based as well as rejection control methods. In this paper, a dual-compensator disturbance-observer-based control algorithm is proposed to ensure a much stronger rejection of disturbances than those of conventional methods. In particular, it is proven that the two compensators in the proposed method effectively estimate disturbances in different frequency regions. Furthermore, the analytical tuning laws for the proposed dual-compensator disturbance-observer-based control method are presented. The experimental setup including the laser positioning platform demonstrated the validity of the proposed method, which effectively rejected various disturbances.
6

Wu, Zongkai, and Wei Wang. "Adaptive Anti-Disturbance Method for Magnetometer and INS Integration in a Road Vehicle." Journal of Navigation 72, no. 06 (May 23, 2019): 1513–32. http://dx.doi.org/10.1017/s0373463319000389.

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The integration of magnetometers and Inertial Navigation Systems (INS) is widely used in low-cost navigation systems. However, even if the system has been calibrated, random magnetic disturbances still appear in practical applications, which lead to large heading errors. To solve this problem, an adaptive anti-disturbance method to overcome random magnetic disturbance is proposed. First, disturbances are classified and analysed in detail based on actual road vehicle driving data. Then an Adaptive Robust Extend Kalman Filter (AREKF) is designed to resist sudden disturbances. However, an AREKF may accumulate errors slowly when a long-term disturbance exists. Considering this situation, this paper proposes that AREKF is used to maintain accuracy in the early stages, at the same time as the magnetometer is quickly calibrated with a Kalman filter. Then, the new magnetometer parameters are put into the AREKF to suppress long-term disturbances. Finally, cascading these two modules, not only the sudden disturbance can be overcome, but the situation of long-term disturbances can be suppressed. The results of simulation and an actual driving test show that the proposed method can effectively overcome random magnetic disturbances in both the short and long term.
7

Zhang, Huifeng, Xinjiang Wei, Lingyan Zhang, and Jian Han. "Disturbance observer-based control for a class of strict-feedback nonlinear systems with derivative-bounded disturbances." Transactions of the Institute of Measurement and Control 42, no. 14 (June 1, 2020): 2601–10. http://dx.doi.org/10.1177/0142331220922464.

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An anti-disturbance control problem is investigated in this paper. The disturbance observer plus back-stepping (DOPBS) control scheme is proposed for a class of strict-feedback nonlinear systems with derivative-bounded disturbances. A nonlinear disturbance observer is designed to estimate the derivative-bounded disturbances. By combining the disturbance observer with back-stepping method, the DOPBS controller is designed to reject and attenuate the disturbances. Stability analysis proves that all the signals in the the closed-loop system are uniformly ultimately bounded (UUB). Finally, simulation examples demonstrate the feasibility and effectiveness of the proposed approach compared with existing methods.
8

Song, Yan Li, Ran Tao, and An Na Wang. "Detection and Localization Method of Power Quality Disturbance Based on Improved TT-Transform." Applied Mechanics and Materials 433-435 (October 2013): 1276–81. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.1276.

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Towards the problem of power quality disturbance detecting and localization in the power system, this paper proposed a new method based on improved TT-transform. Amplitude’s mutation in maximum element sequence of the TT- module matrix’s row is detected to locate beginning and ending time of power quality disturbances. This method can not only detect single power quality disturbance, but also detect composite disturbance accurately. The simulation results show that the method proposed can accurately detect the common power quality disturbance signal.
9

Hagiwara, Takaaki, Kou Yamada, Iwanori Murakami, Yoshinori Ando, and Shun Matsuura. "A Design Method for Modified PID Control Systems to Attenuate Unknown Disturbances." Key Engineering Materials 459 (December 2010): 211–20. http://dx.doi.org/10.4028/www.scientific.net/kem.459.211.

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PID(Proportional-Integral-Derivative) controller structure is the most widely used one in industrial applications. Yamada and Hagiwara proposed a design method for modified PID controllers such that modified PID controllers make the control system for unstable plants stable and the admissible sets of P-parameter, I-parameter and D-parameter are independent from each other. When modified PID control systems are applied to real plants, the influence of disturbance in the plant must be considered. In many cases, disturbance in the plant is unknown. It is comparatively easy to attenuate known disturbance, but it is difficult to attenuate unknown disturbances. From a practical viewpoint, it is desirable to design a modified PID control system to attenuate unknown disturbances. However, no paper examines a design method for modified PID control systems to attenuate unknown disturbances. In this paper, we propose a design method for modified PID control systems to attenuate unknown disturbances.
10

Wang, Guohui, Yanan Yang, and Shuxin Wang. "Adaptive Digital Disturbance Rejection Controller Design for Underwater Thermal Vehicles." Journal of Marine Science and Engineering 9, no. 4 (April 11, 2021): 406. http://dx.doi.org/10.3390/jmse9040406.

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Underwater thermal vehicles, as ocean observation tools, are frequently affected by environment disturbances such as waves and currents, which may cause degradation of the observation accuracy of the vehicles. Consequently, it is important to design a controller for a vehicle that can resist ocean disturbance. In this study, an underwater thermal vehicle principle is introduced, and the mathematical model is established in the vertical plane motion. On this basis, an adaptive digital disturbance suppression control method is proposed. For known disturbance parameters, this controller could compensate for external disturbances by pre-setting control parameters using the internal model principle and parameterizations method. For the case where the disturbance parameters are unknown, disturbance parameter estimation method based on forgetting factor least-squares method is proposed to transform the unknown parameter disturbance into a disturbance with known parameters, which is then suppressed by the adaptive digital disturbance rejection control approach. This solution could effectively solve the challenges caused by parameter uncertainty and unknown time-varying ocean external disturbances. Finally, simulations are carried out for the Petrel underwater thermal glider as an example. The simulation results show the proposed control method’s superiority and inherent robustness.
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Статті в журналах Дисертації Книги

Дисертації з теми "Disturbance method":

1

Udoff, Geoffrey. "An Alternate Trawling Method: Reduced Bycatch and Benthic Disturbance Achieved with the Wing Trawling System." ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2217.

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The Wing Trawling System (WTS) was tested as an alternative to traditional shrimp capture methods in the Gulf. Compared to an otter trawl, this trawl was conceived to reduce bycatch, retain shrimp catch, and minimize seafloor disturbance. Through seventy-one paired tows, the WTS was assessed against a standard otter trawl. The WTS was found to reduce bycatch by 63-65% and reduce shrimp catch by 30-35%. Additionally, I measured the depth of the scars produced by both trawls and quantified the turbidity of the plumes behind them. The scars left by the WTS and the otter trawl were between 9.9 cm-13.6 cm. The turbidity behind the WTS was 18.6 NTU, while the turbidity behind the otter trawl was 206.8 NTU. In conclusion, the WTS offers an alternative to an otter trawl that reduces bycatch and the impact trawling has on the seafloor but results in a significant amount of shrimp loss.
2

Chee, Pui Shan. "Ammonium and Acetate Ion Uptake on Stationary Phases in Hydrophilic Interaction Chromatography by the Minor Disturbance Method." Thesis, Umeå universitet, Kemiska institutionen, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-103379.

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3

Elias, Laila Mireille 1977. "A structurally coupled disturbance analysis method using dynamic mass measurement techniques, with application to spacecraft-reaction wheel systems." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/81563.

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4

Yamada, Keitaro. "Reconstruction of high-resolution geological records and development of a method to identify sedimentary disturbance using Quaternary sedimentary cores from Beppu Bay and Lake Suigetsu, Japan." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225413.

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5

Comber, Carolyn Anne. "Reducing Human Disturbance to Atlantic Flyway Shorebirds Using Social Science Methods." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/102749.

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Human disturbance is a significant threat to shorebirds in North America. Disturbance can result in direct mortality or have long-term impacts on the survival of shorebirds. Land managers employ a variety of management techniques to minimize anthropogenic impacts on shorebirds, but because the Atlantic Flyway is ecologically and recreationally diverse, management can vary among sites. This thesis used social science methods to understand the extent to which human disturbance is managed and how human disturbance is managed. Specifically, we surveyed land managers and biologists in the U.S. and Canada portions of the Atlantic Flyway to examine potential disturbances, types of activities that are restricted, when restrictions occur, the perceived effectiveness of management techniques, public compliance with restrictions, and resource needs of managers. With the findings from this research, agencies and organizations that manage shorebirds can assess where to invest time, effort, and resources to reduce disturbance. We also used a survey of dog walkers to ascertain the benefits and constraints to leashing dogs near shorebirds because dog walking is one of the top-rated potential disturbances to shorebirds. Additionally, we sought to understand the personal and social norms related to dog walking and evaluated if a community-based social marketing (CBSM) approach would be enhanced by the addition of norms. Using a CBSM approach, we provided insights on strategies to promote voluntarily leashing of dogs near shorebirds. Through this thesis, we aimed to bridge the needs of people and the needs of shorebirds, in an effort to produce effective conservation outcomes.
Master of Science
Shorebird populations have declined in the past four decades. Declines are due in part to human use of coastal areas, which can result in harm to shorebirds. To reduce human impacts on shorebirds and help land managers make decisions about management, this thesis used social science methods. Using a survey of managers, we found that management primarily occurs during the spring and summer and is less frequently during the fall and winter. Of the human activities that could disturb shorebirds, walking dogs off leash is the most commonly regulated. But people are also least commonly compliant with these regulations. Managers believe that the best ways to reduce disturbance to shorebirds included fencing, informal outreach, and signage. More staff and volunteers are also needed to help reduce disturbance. In a subsequent survey of dog walkers, we learned why people leash (or do not leash) dogs near shorebirds. We found that people leash to protect shorebirds, keep dogs safe, control dogs, and keep dogs from bothering people. People choose not to leash because leashing prevents dogs from exercising and socializing, and people believe dogs respond to commands. People who leash dogs generally believe others expect them to leash their dogs near shorebirds. Knowing why people leash or do not leash can help predict leashing behavior and encourage dog walkers to voluntarily leash dogs near shorebirds. This thesis considers the needs of people and the needs of shorebirds as way to achieve effective conservation solutions.
6

Comber, Carolyn. "Reducing Human Disturbance to Atlantic Flyway Shorebirds Using Social Science Methods." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/102749.

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Human disturbance is a significant threat to shorebirds in North America. Disturbance can result in direct mortality or have long-term impacts on the survival of shorebirds. Land managers employ a variety of management techniques to minimize anthropogenic impacts on shorebirds, but because the Atlantic Flyway is ecologically and recreationally diverse, management can vary among sites. This thesis used social science methods to understand the extent to which human disturbance is managed and how human disturbance is managed. Specifically, we surveyed land managers and biologists in the U.S. and Canada portions of the Atlantic Flyway to examine potential disturbances, types of activities that are restricted, when restrictions occur, the perceived effectiveness of management techniques, public compliance with restrictions, and resource needs of managers. With the findings from this research, agencies and organizations that manage shorebirds can assess where to invest time, effort, and resources to reduce disturbance. We also used a survey of dog walkers to ascertain the benefits and constraints to leashing dogs near shorebirds because dog walking is one of the top-rated potential disturbances to shorebirds. Additionally, we sought to understand the personal and social norms related to dog walking and evaluated if a community-based social marketing (CBSM) approach would be enhanced by the addition of norms. Using a CBSM approach, we provided insights on strategies to promote voluntarily leashing of dogs near shorebirds. Through this thesis, we aimed to bridge the needs of people and the needs of shorebirds, in an effort to produce effective conservation outcomes.
Master of Science
Shorebird populations have declined in the past four decades. Declines are due in part to human use of coastal areas, which can result in harm to shorebirds. To reduce human impacts on shorebirds and help land managers make decisions about management, this thesis used social science methods. Using a survey of managers, we found that management primarily occurs during the spring and summer and is less frequently during the fall and winter. Of the human activities that could disturb shorebirds, walking dogs off leash is the most commonly regulated. But people are also least commonly compliant with these regulations. Managers believe that the best ways to reduce disturbance to shorebirds included fencing, informal outreach, and signage. More staff and volunteers are also needed to help reduce disturbance. In a subsequent survey of dog walkers, we learned why people leash (or do not leash) dogs near shorebirds. We found that people leash to protect shorebirds, keep dogs safe, control dogs, and keep dogs from bothering people. People choose not to leash because leashing prevents dogs from exercising and socializing, and people believe dogs respond to commands. People who leash dogs generally believe others expect them to leash their dogs near shorebirds. Knowing why people leash or do not leash can help predict leashing behavior and encourage dog walkers to voluntarily leash dogs near shorebirds. This thesis considers the needs of people and the needs of shorebirds as way to achieve effective conservation solutions.
7

Niu, Yang. "Investigation of applying normal mode initialization method to planetary stationary wave disturbances." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/54987.

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8

Nesslar, Richard William. "EXAMINING METHODS TO RESTORE AND REHABILITATE NATIVE CANEBRAKE HABITAT IN SOUTHERN ILLINOIS." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2382.

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Giant cane (Arundinaria gigantea) is a native bamboo that forms large monodominant stands called canebrakes in bottomlands in the southeastern US. Canebrakes are valuable habitat for wildlife and function as riparian buffers to protect soils and water quality. Currently, only 2% of canebrake ecosystems remain. Thus there is interest in establishing new canebrakes as well as maintaining and expanding existing canebrakes. For field restoration, using cane rhizomes to produce transplants is possible but it is unknown when propagules should be collected and grown. For rehabilitation of existing canebrakes, preliminary studies suggest that fertilization and disturbance such as fire can be beneficial but additional broader-ranging studies are warranted. This research reports on three giant cane studies involving producing transplants from rhizomes and involving managing existing canebrakes with disturbance in southern Illinois. The main objectives of study 1 were to ascertain a) if collection season influences the proportion of rhizome propagules that grow at least one culm (culm production success) and the resultant culm growth when transplanted in a greenhouse b) if specific rhizome characteristics influence an individual rhizome’s ability to produce a culm c) if aboveground biomass could be a predictor of the amount of belowground propagules and d) if aboveground biomass, total rhizome length, number of rhizome nodes, or number of rhizome buds could be a predictor of how many culms could be produced when transplanting. Monthly, for a year, sample plots were randomly selected in the SIUC giant cane nursery. In sample plots aboveground culm measurements were collected included live culm density (#/0.25m2), dead culm density (#/0.25m2), height of the tallest culm (cm), diameter of the tallest culm (mm), and total aboveground biomass (g). Each month rhizomes were dug from the sample plots, measured (length (cm), diameter (mm), # nodes, and # live buds), and transplanted into pots and placed in the greenhouse for approximately 94 days. At that time, measurements were taken of the number of live and dead culms produced per pot and the height of the tallest culm (cm). Results indicate that rhizomes collected and transplanted in the greenhouse during winter and spring months (December-May), had significantly greater culm production success and produced significantly taller culms. Also, rhizomes intermediate in length (18-30 cm) that contained 5 to 12 nodes and 4 to 9 live buds tended to have higher than average culm production. Finally, a positive correlation existed between the amount of aboveground biomass and the number of rhizome nodes, the number of live rhizome buds, and the length of rhizomes found in sample plots. Aboveground biomass can predict the amount of belowground rhizome propagules that can be used for canebrake restoration. Study 2 is a two year continuation of work initiated in 2011 and reported on by Margaret Anderson in 2014 on the effects of fire, fertilization, and fire and fertilization combined on the growth and expansion (culm density, height and diameter) of canebrakes within the Cache River Watershed in southern Illinois. Results showed considerable year to year variability among treatments within the canebrake for some growth parameters. However, three years after disturbance, all treatments tended to have similar culm density and growth values and canebrake expansion occurred for all treatments into exterior plots. Fire alone was similar to controls in growth parameters and did not produce any long-term negative effects. Thus, fire can be used as an effective tool to reduce competition from other species, allowing managed canebrakes to persist longer than those that remain undisturbed. Fertilization used alone and in combination with fire, produced slight growth and density increases, but added costs may not warrant its use in canebrake management. Study 3 compared fire and mowing disturbances on the growth and expansion of remnant canebrakes located in southern Illinois. Eleven replications in remnant canebrakes were established throughout the Cache River watershed. Each replication contained a fire only treatment, a mowing only treatment, and a control. Measurements were taken in the dormant season early in 2012 prior to a single mowing and a single fire in March, and after each growing season thru 2014. Measurements including live and dead culm density (#m2), culm height (cm), and culm diameter (0.01 mm), were taken within subplots in the canebrake interior and exterior. Results from this study showed that mowing can be used as an effective alternative to fire for the management of remnant canebrakes through reductions in competition. Neither fire nor mowing produced negative effects of growth within the measured canebrakes or in adjacent areas. Like the previous study, all treatments including the control experienced an outward expansion of cane culms throughout the course of the study. This study shows that both fire and mowing can be used as effective tools to reduce competition within canebrakes to aid in their continued vigor.
9

Odemark, Ylva. "Wind-turbine wake flows - Effects of boundary layers and periodic disturbances." Doctoral thesis, KTH, Strömningsfysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-144475.

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The increased fatigue loads and decreased power output of a wind turbine placed in the wake of another turbine is a well-known problem when building new wind-power farms and a subject of intensive research. These problems are caused by the velocity gradients and high turbulence levels present in the wake of a turbine. In order to better estimate the total power output and life time of a wind-power farm, knowledge about the development and stability of wind-turbine wakes is crucial. In the present thesis, the flow field around small-scale model wind turbines has been investigated experimentally in two wind tunnels. The flow velocity was measured with both hot-wire anemometry and particle image velocimetry. To monitor the turbine performance, the rotational frequency, the power output and the total drag force on the turbine were also measured. The power and thrust coefficients for different tip-speed ratios were calculated and compared to the blade element momentum method, with a reasonable agreement. The same method was also used to design and manufacture new turbine blades, which gave an estimate of the distribution of the lift and drag forces along the blades. The influence of the inlet conditions on the turbine and the wake properties was studied by subjecting the turbine to both uniform in flow and different types of boundary layer in flows. In order to study the stability and development of the tip vortices shed from the turbine blades, a new experimental setup for phase-locked measurements was constructed. The setup made it possible to introduce perturbations of different frequencies and amplitudes, located in the rear part of the nacelle. With a newly developed method, it was possible to characterize the vortices and follow their development downstream, using only the streamwise velocity component. Measurements were also performed on porous discs placed in different configurations. The results highlighted the importance of turbine spacings. Both the measurements on the turbine and the discs were also used to compare with large eddy simulations using the actuator disc method. The simulations managed to predict the mean velocity fairly well in both cases, while larger discrepancies were seen in the turbulence intensity.

QC 20140424

10

Parsons, Monika. "Developing Methods to Monitor Seabird Response to Disturbance on a Coastal Maine Island." Fogler Library, University of Maine, 2011. http://www.library.umaine.edu/theses/pdf/ParsonsM2011.pdf.

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Книги з теми "Disturbance method":

1

Barclay, R. J. Disturbance index method for assessing severity of procedures on rodents. Wheathampstead, Herts: Universities Federation for Animal Welfare, 1988.

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2

Richling, Andrzej, and Michał Osowiec. Landscape ecological methods for strongly transformed areas. Warsaw: Warsaw University, Faculty of Geography and Regional Studies, 2001.

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3

Miller, Nicholas P., David Cantor, Sharon Lohr, Eric Jodts, Pam Boene, Doug Williams, James Fields, Monty Gettys, Mathias Basner, and Ken Hume. Research Methods for Understanding Aircraft Noise Annoyances and Sleep Disturbance. Washington, D.C.: Transportation Research Board, 2014. http://dx.doi.org/10.17226/22352.

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4

Aasaraai, A. Geometric methods in linear control theory: On disturbance decoupling in descriptor systems. Salford: Universityof Salford, 1988.

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5

Bland, Samuel R. Personal computer study of finite-difference methods for the transonic small disturbance equation. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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6

Bland, Samuel R. Personal computer study of finite-difference methods for the transonic small disturbance equation. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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7

D, Henderson James. Causes, preventive measures, and methods of controlling riots & disturbances in correctional institutions. Edited by Phillips Richard L and American Correctional Association. 3rd ed. Laurel, MD: American Correctional Association, 1990.

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8

Henderson, James D. Causes, preventive measures, and methods of controlling riots & disturbances in correctional institutions. 5th ed. Lanham, Md: American Correctional Association, 1998.

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9

Severinghaus, W. D. Standard methods for ecological surveys of Army training lands: Site selection, disturbance index, bird, and mammal data collection. Champaign, Ill: US Army Corps of Engineers, Construction Engineering Research Laboratory, 1986.

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10

Herr, Stefan. Experimental investigation of airfoil boundary-layer receptivity and a method for the characterization of the relevant free-stream disturbances. München: Verlag Dr. Hut, 2004.

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Частини книг з теми "Disturbance method":

1

Li, Qi, Jun Fang, and Jia Sheng. "Data-Driven Power Quality Disturbance Sources Identification Method." In Web Information Systems and Applications, 569–74. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30952-7_57.

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2

Truong, Thanh Nguyen, Hee-Jun Kang, and Anh Tuan Vo. "An Active Disturbance Rejection Control Method for Robot Manipulators." In Intelligent Computing Methodologies, 190–201. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60796-8_16.

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3

Kassymkanova, Khaini-Kamal, Gulnara Jangulova, Gulnura Issanova, Venera Turekhanova, and Yermek Zhalgasbekov. "Ultrasonic Method of Express Evaluation of the Rock Massif Disturbance." In Geomechanical Processes and Their Assessment in the Rock Massifs in Central Kazakhstan, 33–62. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33993-7_5.

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4

Jatiningrum, D., C. C. de Visser, M. M. van Paassen, E. van Kampen, and M. Mulder. "Characterising Angular Accelerometer Calibration Setup Disturbance Using Box–Jenkins Method." In Advances in Aerospace Guidance, Navigation and Control, 279–94. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65283-2_15.

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5

Yang, Genghuang, Xin Su, Feifei Wang, Shigang Cui, and Li Zhao. "Correlation Processing Based De-noising Method for Power Quality Disturbance." In Lecture Notes in Electrical Engineering, 181–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25541-0_24.

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6

Wang, Xudong, Tao Geng, Zuopeng Chen, and Jin Zhao. "A Zone Control Method for Ship Heading Under Wave Disturbance." In Intelligent Robotics and Applications, 246–54. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97589-4_21.

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7

Chen, Yongqi, and Xiangsheng Yang. "A Novel Fault Diagnosis Method for the Plant with Min-Disturbance." In Future Control and Automation, 271–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31003-4_34.

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8

Zhang, Tianxu, Yuehuan Wang, and Sheng Zhong. "Disturbance Reducing Method for Target Imaging and Detection on Moving Platform." In Guidance Information Processing Methods in Airborne Optical Imaging Seeker, 73–97. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6994-0_4.

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9

Wen, Xin, Junhong Wang, Yixin Luo, and Dizhi Long. "An Actuator Fault Diagnosis Combined Method Based on Intelligent Disturbance Observer." In Lecture Notes in Electrical Engineering, 813–24. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8155-7_68.

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10

Xia, Rongsheng, Qingxian Wu, and Xiaohui Yan. "Disturbance Observer Based Optimal Attitude Control of NSV Using $$\theta -D$$ Method." In Neural Information Processing, 219–27. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-70136-3_24.

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Тези доповідей конференцій з теми "Disturbance method":

1

Kim, Jaeho. "On a Disturbance Rejection Method." In 1991 American Control Conference. IEEE, 1991. http://dx.doi.org/10.23919/acc.1991.4791385.

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2

Jinhua, She, and Xin Xin. "Equivalent-Input-Disturbance Method Improves Disturbance Rejection Performance: The MIMO Case." In 2007 Chinese Control Conference. IEEE, 2006. http://dx.doi.org/10.1109/chicc.2006.4347219.

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3

Cao, Y. "Input screening method for disturbance rejection." In UKACC International Conference on Control. Control '96. IEE, 1996. http://dx.doi.org/10.1049/cp:19960602.

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4

Wu, Tiezhou, Jinlong Xiong, Xiaomin Wu, and Meng Luo. "A novel active current disturbance method." In Next Generation Computer and Information Technology 2015. Science & Engineering Research Support soCiety, 2015. http://dx.doi.org/10.14257/astl.2015.111.12.

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5

Liu, Na, Chunyang Wang, and Jing Sun. "Gyro stabilized pod disturbance suppression method based on fractional order disturbance observer." In 2019 Chinese Control Conference (CCC). IEEE, 2019. http://dx.doi.org/10.23919/chicc.2019.8865310.

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6

Sato, Masayuki, Nobuhiro Yokoyama, and Atsushi Satoh. "Disturbance suppression via robust MPC using prior disturbance data: Low computational complexity method." In 2009 IEEE International Conference on Control and Automation (ICCA). IEEE, 2009. http://dx.doi.org/10.1109/icca.2009.5410203.

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7

Zielinska, Teresa, Zhingiang Gao, Magdalena Zurawska, Qinling Zheng, Thomas Mergner, and Vittorio Lippi. "Postural balance using a disturbance rejection method." In 2017 11th International Workshop on Robot Motion and Control (RoMoCo). IEEE, 2017. http://dx.doi.org/10.1109/romoco.2017.8003888.

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8

Wang, Jidong, and Chengshan Wang. "Bayes Method of Power Quality Disturbance Classification." In TENCON 2005 - 2005 IEEE Region 10 Conference. IEEE, 2005. http://dx.doi.org/10.1109/tencon.2005.300847.

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9

Zhao, Hui, Fuxue Zhang, Qingwen Yan, and Xing Gao. "Anti-acceleration Disturbance Method for Pendulum Tiltmeter." In 2nd International Conference on Electronic and Mechanical Engineering and Information Technology. Paris, France: Atlantis Press, 2012. http://dx.doi.org/10.2991/emeit.2012.25.

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10

Zhang, Jingyue. "Disturbance and detection method based power quality." In XVI INTERNATIONAL CONFERENCE ON LUMINESCENCE AND LASER PHYSICS DEVOTED TO THE 100TH ANNIVERSARY OF IRKUTSK STATE UNIVERSITY. Author(s), 2019. http://dx.doi.org/10.1063/1.5089055.

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Звіти організацій з теми "Disturbance method":

1

Conrady, Morgan, Markus Bauer, Kyoo Jo, Donald Cropek, and Ryan Busby. Solid-phase microextraction (SPME) for determination of geosmin and 2-methylisoborneol in volatile emissions from soil disturbance. Engineer Research and Development Center (U.S.), October 2021. http://dx.doi.org/10.21079/11681/42289.

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Анотація:
A method is described here for the concentration and determination of geosmin and 2-methylisoborneol (2-MIB) from the gaseous phase, with translation to field collection and quantification from soil disturbances in situ. The method is based on the use of solid-phase microextraction (SPME) fibers for adsorption of volatile chemicals from the vapor phase, followed by desorption into a gas chromatograph-mass spectrometer (GC-MS) for analysis. The use of a SPME fiber allows simple introduction to the GC-MS without further sample preparation. Several fiber sorbent types were studied and the 50/30 μm DVB/CAR/PDMS was the best performer to maximize the detected peak areas of both analytes combined. Factors such as extraction temperature and time along with desorption temperature and time were explored with respect to analyte recovery. An extraction temperature of 30 ◦C for 10 min, with a desorption temperature of 230 ◦C for 4 min was best for the simultaneous analysis of both geosmin and 2-MIB without complete loss of either one. The developed method was used successfully to measure geosmin and 2-MIB emission from just above disturbed and undisturbed soils, indicating that this method detects both compounds readily from atmospheric samples. Both geosmin and 2-MIB were present as background concentrations in the open air, while disturbed soils emitted much higher concentrations of both compounds. Surprisingly, 2-MIB was always detected at higher concentrations than geosmin, indicating that a focus on its detection may be more useful for soil emission monitoring and more sensitive to low levels of soil disturbance.
2

Johnson, Sarah, Michael Sinclair, Emily Leonard, and Forrest Rosenbower. Development of strategies for monitoring and managing sandscape vegetation, with an assessment of declining vegetation in the Apostle Islands National Lakeshore. National Park Service, April 2022. http://dx.doi.org/10.36967/nrr-2293187.

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Coastal dune habitats such as those of the Apostle Islands National Lakeshore (APIS) are regionally rare habitats of global and state-wide concern. Their dynamic, sandy landforms provide habitat for unique species specifically adapted to frequent disturbance, drought, and other stresses. Despite having disturbance-driven life histories, these species are at risk due to increased visitor use of sandscape habitats and environmental change. Resource managers at APIS have long understood the values of these sandscapes and threats presented by recreational trampling, but more recently they have recognized the precarious position that these coastal habitats are in due to their proximity to the lake and exposure to weather-related phenomena linked with long-term climate change. In recognition of emerging threats and the need to track impacts of these threats, park managers initiated a revision of their methods for monitoring sandscape vegetation. We applied these methods to 15 sandscape locations within the national lakeshore in 2014. Here, we outline what these revisions to the methods were, assess the current status of sandscape structure and composition, assess the utility of data collected with these methods, provide suggestions for further revisions of the sampling method, outline a two-tiered sampling approach for future monitoring, and we provide management recommendations. In a second section of the report, we provide a focused assessment of the size and health of Juniperus communis (common juniper), a target species of concern in these sandscape communities after it was observed by park managers to be dying or stressed on Michigan Island. Our assessments include the status of J. communis across all sandscapes monitored in 2014, and an analysis of change over time since 2012 in the health of J. communis on Michigan, Outer, and Stockton Islands. We provide evidence of impacts by rodents on foliar dieback, primarily on Michigan Island, and we discuss possible interactions with the non-native pale juniper web-worm (Aethes rutilana) and with climate change.
3

Johnson, Sarah, Michael Sinclair, Emily Leonard, and Forrest Rosenbower. Development of strategies for monitoring and managing sandscape vegetation, with an assessment of declining vegetation in the Apostle Islands National Lakeshore. National Park Service, April 2022. http://dx.doi.org/10.36967/nrr-2293187.

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Coastal dune habitats such as those of the Apostle Islands National Lakeshore (APIS) are regionally rare habitats of global and state-wide concern. Their dynamic, sandy landforms provide habitat for unique species specifically adapted to frequent disturbance, drought, and other stresses. Despite having disturbance-driven life histories, these species are at risk due to increased visitor use of sandscape habitats and environmental change. Resource managers at APIS have long understood the values of these sandscapes and threats presented by recreational trampling, but more recently they have recognized the precarious position that these coastal habitats are in due to their proximity to the lake and exposure to weather-related phenomena linked with long-term climate change. In recognition of emerging threats and the need to track impacts of these threats, park managers initiated a revision of their methods for monitoring sandscape vegetation. We applied these methods to 15 sandscape locations within the national lakeshore in 2014. Here, we outline what these revisions to the methods were, assess the current status of sandscape structure and composition, assess the utility of data collected with these methods, provide suggestions for further revisions of the sampling method, outline a two-tiered sampling approach for future monitoring, and we provide management recommendations. In a second section of the report, we provide a focused assessment of the size and health of Juniperus communis (common juniper), a target species of concern in these sandscape communities after it was observed by park managers to be dying or stressed on Michigan Island. Our assessments include the status of J. communis across all sandscapes monitored in 2014, and an analysis of change over time since 2012 in the health of J. communis on Michigan, Outer, and Stockton Islands. We provide evidence of impacts by rodents on foliar dieback, primarily on Michigan Island, and we discuss possible interactions with the non-native pale juniper web-worm (Aethes rutilana) and with climate change.
4

Page-Dumroese, Deborah S., Ann M. Abbott, and Thomas M. Rice. Forest Soil Disturbance Monitoring Protocol: Volume II: Supplementary methods, statistics, and data collection. Washington, DC: U.S. Department of Agriculture, Forest Service, 2009. http://dx.doi.org/10.2737/wo-gtr-82b.

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5

Hammermeister, D. P., D. O. Blout, and J. C. McDaniel. Drilling and coring methods that minimize the disturbance of cuttings, core, and rock formation in the unsaturated zone, Yucca Mountain, Nevada. Office of Scientific and Technical Information (OSTI), December 1985. http://dx.doi.org/10.2172/59845.

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6

Seginer, Ido, Louis D. Albright, and Robert W. Langhans. On-line Fault Detection and Diagnosis for Greenhouse Environmental Control. United States Department of Agriculture, February 2001. http://dx.doi.org/10.32747/2001.7575271.bard.

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Background Early detection and identification of faulty greenhouse operation is essential, if losses are to be minimized by taking immediate corrective actions. Automatic detection and identification would also free the greenhouse manager to tend to his other business. Original objectives The general objective was to develop a method, or methods, for the detection, identification and accommodation of faults in the greenhouse. More specific objectives were as follows: 1. Develop accurate systems models, which will enable the detection of small deviations from normal behavior (of sensors, control, structure and crop). 2. Using these models, develop algorithms for an early detection of deviations from the normal. 3. Develop identifying procedures for the most important faults. 4. Develop accommodation procedures while awaiting a repair. The Technion team focused on the shoot environment and the Cornell University team focused on the root environment. Achievements Models: Accurate models were developed for both shoot and root environment in the greenhouse, utilizing neural networks, sometimes combined with robust physical models (hybrid models). Suitable adaptation methods were also successfully developed. The accuracy was sufficient to allow detection of frequently occurring sensor and equipment faults from common measurements. A large data base, covering a wide range of weather conditions, is required for best results. This data base can be created from in-situ routine measurements. Detection and isolation: A robust detection and isolation (formerly referred to as 'identification') method has been developed, which is capable of separating the effect of faults from model inaccuracies and disturbance effects. Sensor and equipment faults: Good detection capabilities have been demonstrated for sensor and equipment failures in both the shoot and root environment. Water stress detection: An excitation method of the shoot environment has been developed, which successfully detected water stress, as soon as the transpiration rate dropped from its normal level. Due to unavailability of suitable monitoring equipment for the root environment, crop faults could not be detected from measurements in the root zone. Dust: The effect of screen clogging by dust has been quantified. Implications Sensor and equipment fault detection and isolation is at a stage where it could be introduced into well equipped and maintained commercial greenhouses on a trial basis. Detection of crop problems requires further work. Dr. Peleg was primarily responsible for developing and implementing the innovative data analysis tools. The cooperation was particularly enhanced by Dr. Peleg's three summer sabbaticals at the ARS, Northem Plains Agricultural Research Laboratory, in Sidney, Montana. Switching from multi-band to hyperspectral remote sensing technology during the last 2 years of the project was advantageous by expanding the scope of detected plant growth attributes e.g. Yield, Leaf Nitrate, Biomass and Sugar Content of sugar beets. However, it disrupted the continuity of the project which was originally planned on a 2 year crop rotation cycle of sugar beets and multiple crops (com and wheat), as commonly planted in eastern Montana. Consequently, at the end of the second year we submitted a continuation BARD proposal which was turned down for funding. This severely hampered our ability to validate our findings as originally planned in a 4-year crop rotation cycle. Thankfully, BARD consented to our request for a one year extension of the project without additional funding. This enabled us to develop most of the methodology for implementing and running the hyperspectral remote sensing system and develop the new analytical tools for solving the non-repeatability problem and analyzing the huge hyperspectral image cube datasets. However, without validation of these tools over a ful14-year crop rotation cycle this project shall remain essentially unfinished. Should the findings of this report prompt the BARD management to encourage us to resubmit our continuation research proposal, we shall be happy to do so.
7

Hessburg, Paul F., Bradley G. Smith, Craig A. Miller, Scott D. Kreiter, and R. Brion Salter. Modeling change in potential landscape vulnerability to forest insect and pathogen disturbances: methods for forested subwatersheds sampled in the midscale interior Columbia River basin assessment. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1999. http://dx.doi.org/10.2737/pnw-gtr-454.

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