Journal articles: 'Repetition in iterature'

1

Wen, Xiu Lan, Hong Sheng Li, Dong Xia Wang, and Jia Cai Huang. "Iterative Learning Controller Based on Particle Swarm Optimization." Advanced Materials Research 403-408 (November 2011): 593–600. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.593.

Full text

Abstract:

Iterative Learning Control (ILC) has recently emerged as a powerful control strategy that iteratively achieves a higher accuracy for systems with repetitive tasks. The basic idea of ILC is to construct a compensation signal based on the tracking error in each repetition so as to reduce the tracking error in the next repetition. In this paper, particle swarm optimization (PSO) is proposed to optimize the input of iterative learning controller. The experimental results confirm that the proposed method not only has higher tracking accuracy than that of Improved Genetic Algorithm (IGA) and traditional Genetic Algorithm based elisit strategy (EGA), but also has the advantages of simple algorithm and good flexibility. And compared with conventional iterative learning control methods, it is easy to solve the optimal input for non-linear plant models.

APA, Harvard, Vancouver, ISO, and other styles

2

Owens, David, and Steve Daley. "Iterative Learning Control — Monotonicity and Optimization." International Journal of Applied Mathematics and Computer Science 18, no. 3 (September 1, 2008): 279–93. http://dx.doi.org/10.2478/v10006-008-0026-7.

Full text

Abstract:

Iterative Learning Control — Monotonicity and OptimizationThe area if Iterative Learning Control (ILC) has great potential for applications to systems with a naturally repetitive action where the transfer of data from repetition (trial or iteration) can lead to substantial improvements in tracking performance. There are several serious issues arising from the "2D" structure of ILC and a number of new problems requiring new ways of thinking and design. This paper introduces some of these issues from the point of view of the research group at Sheffield University and concentrates on linear systems and the potential for the use of optimization methods and switching strategies to achieve effective control.

APA, Harvard, Vancouver, ISO, and other styles

3

Rwafa, James, and Farzad Ghayoor. "Implementation of Iterative Learning Control on a Pneumatic Actuator." Actuators 11, no. 8 (August 22, 2022): 240. http://dx.doi.org/10.3390/act11080240.

Full text

Abstract:

Pneumatic actuators demonstrate various nonlinear and uncertain behavior, and as a result, precise control of such actuators with model-based control schemes is challenging. The Iterative Learning Control (ILC) algorithm is a model-free control method usually used for repetitive processes. The ILC uses information from previous repetitions to learn about a system’s dynamics for generating a more suitable control signal. In this paper, an ILC method to overcome the nonlinearities and uncertainties in a pneumatic cylinder-piston actuator is suggested. The actuator is modeled using MATLAB SimScape blocks, and the ILC scheme has been expanded for controlling nonlinear, non-repetitive systems so that it can be used to control the considered pneumatic system. The simulation results show that the designed ILC controller is capable of tracking a non-repetitive reference signal and can overcome the internal and payload uncertainties with the precision of 0.002 m. Therefore, the ILC can be considered as an approach for controlling the pneumatic actuators, which is challenging to obtain their mathematical modeling.

APA, Harvard, Vancouver, ISO, and other styles

4

Solomon, Ty. "Rhythm and Mobilization in International Relations." International Studies Quarterly 63, no. 4 (August 29, 2019): 1001–13. http://dx.doi.org/10.1093/isq/sqz074.

Full text

Abstract:

Abstract International Relations (IR) has rarely considered rhythm as a topic of analytical attention. Yet rhythms permeate many social and political phenomena, and their study contributes to core debates and empirical insights in contemporary IR. Rhythms are similar to but distinct from other forms of repetitive, iterative social action that have garnered increasing interest in IR, such as practices, habits, and routines. Each of these phenomena has rhythmic elements, but not all rhythmic phenomena are practical, habitual, or routine. Rhythm, then, is a distinct category of iterative action that is effectively positioned to unpack a wider array of practices in a broader range of cases. Moreover, contrary to common conceptions as simple repetition, the multiplicity and dynamism of social rhythms hold the potential to produce novel political formations. This article outlines a framework for the study of rhythms in IR by delineating some key features of social rhythms and three kinds of sociopolitical effects that they have in collective contexts. These theoretical developments are empirically applied to understand neglected aspects of mass mobilization during the Arab uprisings of 2011.

APA, Harvard, Vancouver, ISO, and other styles

5

Rabenstein, Rudolf, and Peter Steffen. "Numerical iterative methods and repetitive processes." Multidimensional Systems and Signal Processing 23, no. 1-2 (June 3, 2010): 163–83. http://dx.doi.org/10.1007/s11045-010-0115-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Freeman, Chris, and Ying Tan. "Iterative learning control and repetitive control." International Journal of Control 84, no. 7 (July 2011): 1193–95. http://dx.doi.org/10.1080/00207179.2011.596574.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Smailbegović, Ada. "Iterative Objects: Hauntings of Identity in Poetic Form." American Literary History 34, no. 4 (November 18, 2022): 1447–55. http://dx.doi.org/10.1093/alh/ajac157.

Full text

Abstract:

Abstract Channeling Gertrude Stein’s assertion from her lecture “Portraits and Repetition” that there is no such thing as repetition because both language and other entities that compose the world are continuously undergoing change, this essay explores the question of iteration or recursion in two recent critical books, Brian Kim Stefans’s Word Toys: Poetry and Technics (2017) and Jacob Edmond’s Make it the Same: Poetry in the Age of Global Media (2019). Stefans develops a critical practice that considers poems to be autonomous, dynamic entities, akin to machines or living organisms, thus connecting to longstanding traditions in twentieth-century poetry, which have imagined words as objects that populate the open field of the poem. However, much as Stein suggests, such linguistic objects are not self-same or stable. This opens the question of the role of iteration with a difference in the constitution of such entities, and in the context of Edmond’s book Make It the Same this question is extended to poetic techniques, such as copying, in their variously mediated forms, ranging from the use of a tape recorder to digital media.[L]iving entities, which for Stein as for Stefans, can be defined as forms of subjectivity—as poems, roses or frogs—are not self-same and are, instead, iteratively created in each recursion or repetition.

APA, Harvard, Vancouver, ISO, and other styles

8

Cao, Zhixing, Jingyi Lu, Ridong Zhang, and Furong Gao. "Iterative learning Kalman filter for repetitive processes." Journal of Process Control 46 (October 2016): 92–104. http://dx.doi.org/10.1016/j.jprocont.2016.08.003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Qiao, Jian Zhong, Hao Wu, Yukai Zhu, Jianwei Xu, and Wenshuo Li. "Anti-disturbance iterative learning tracking control for space manipulators with repetitive reference trajectory." Assembly Automation 39, no. 3 (August 5, 2019): 401–9. http://dx.doi.org/10.1108/aa-12-2017-176.

Full text

Abstract:

Purpose This paper is concerned with the repetitive trajectory tracking control for space manipulators under model uncertainties and vibration disturbances. Design/methodology/approach The model uncertainties and link vibration of manipulators will degrade the tracking performance of space manipulators; in this paper, a new hybrid control scheme that consists of a composite hierarchical anti-disturbance controller and an iterative learning controller is developed to solve this problem. Findings The composite hierarchical controller can effectively attenuate model uncertainties and reject vibration disturbances, whereas the iterative learning controller is able to improve the tracking accuracy for repetitive reference trajectory. Originality/value The proposed scheme compensates for the shortcomings of iterative learning control which can only deal with repetitive disturbances, ensuring the accuracy and repeatability of space manipulators under model uncertainties and random disturbances.

APA, Harvard, Vancouver, ISO, and other styles

10

Nagaya, Naonori. "Reduplication and repetition from a constructionist perspective." Belgian Journal of Linguistics, Volume 34 (2020) 34 (December 31, 2020): 259–72. http://dx.doi.org/10.1075/bjl.00051.nag.

Full text

Abstract:

Abstract In the typological literature, a distinction is often drawn between reduplication (as a morphological process) and repetition (as a syntactic process) (Gil 2005). This squib reconsiders this distinction from the perspective of Construction Morphology (Booij 2010, 2018; Masini and Audring 2019). Drawing upon previously understudied phenomena in Tagalog, an Austronesian language of the Philippines, this paper demonstrates that the Construction Morphology approach provides a suitable framework for analyzing reduplication and repetition. It makes it possible to account for both similarities and differences between reduplication and repetition: both processes create a lexical unit with an iterative form and a conventionalized meaning, although they differ in the size and complexity of the lexical unit they create. Furthermore, this paper makes a strong case for the basic tenets of constructionist approaches, including a hierarchical lexicon and a lexicon-grammar continuum.

APA, Harvard, Vancouver, ISO, and other styles

11

Dridi, Jamel, Selma Ben attia, Salah Salhi, and Mekki Ksouri. "Repetitive Processes Based Iterative Learning Control Designed by LMIs." ISRN Applied Mathematics 2012 (December 22, 2012): 1–18. http://dx.doi.org/10.5402/2012/365927.

Full text

Abstract:

This paper addressed the stability analysis along the pass and the synthesis problem of linear 2D/repetitive systems. The algorithms for control law design are developed using a strong form of stability for discrete and differential linear repetitive processes known as stability along the pass. In particular, recent work on the use of linear matrix inequalities- (LMIs-) based methods in the design of control schemes for discrete and differential linear repetitive processes will be highlighted by the application of the resulting theory of linear model. The resulting design computations are in terms of linear matrix inequalities (LMIs). Simulation results demonstrate the good performance of the theoretical scheme.

APA, Harvard, Vancouver, ISO, and other styles

12

Tüfekçi, Tolga, and Refik Güllü. "An iterative approximation scheme for repetitive Markov processes." Journal of Applied Probability 36, no. 3 (September 1999): 654–67. http://dx.doi.org/10.1239/jap/1032374624.

Full text

Abstract:

Repetitive Markov processes form a class of processes where the generator matrix has a particular repeating form. Many queueing models fall in this category such as M/M/1 queues, quasi-birth-and-death processes, and processes with M/G/1 or GI/M/1 generator matrices. In this paper, a new iterative scheme is proposed for computing the stationary probabilities of such processes. An infinite state process is approximated by a finite state process by lumping an infinite number of states into a super-state. What we call the feedback rate, the conditional expected rate of flow from the super-state to the remaining states, given the process is in the super-state, is approximated simultaneously with the steady state probabilities. The method is theoretically developed and numerically tested for quasi-birth-and-death processes. It turns out that the new concept of the feedback rate can be effectively used in computing the stationary probabilities.

APA, Harvard, Vancouver, ISO, and other styles

13

Muthumari, S., V. Gomathi, R. Srimathi, Kishore Eswaran, and V. Kamatchi Kannan. "Iterative Learning Control for a Repetitive 2D Process." IOP Conference Series: Materials Science and Engineering 995 (December 15, 2020): 012003. http://dx.doi.org/10.1088/1757-899x/995/1/012003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Tüfekçi, Tolga, and Refik Güllü. "An iterative approximation scheme for repetitive Markov processes." Journal of Applied Probability 36, no. 03 (September 1999): 654–67. http://dx.doi.org/10.1017/s0021900200017472.

Full text

Abstract:

Repetitive Markov processes form a class of processes where the generator matrix has a particular repeating form. Many queueing models fall in this category such as M/M/1 queues, quasi-birth-and-death processes, and processes with M/G/1 or GI/M/1 generator matrices. In this paper, a new iterative scheme is proposed for computing the stationary probabilities of such processes. An infinite state process is approximated by a finite state process by lumping an infinite number of states into a super-state. What we call the feedback rate, the conditional expected rate of flow from the super-state to the remaining states, given the process is in the super-state, is approximated simultaneously with the steady state probabilities. The method is theoretically developed and numerically tested for quasi-birth-and-death processes. It turns out that the new concept of the feedback rate can be effectively used in computing the stationary probabilities.

APA, Harvard, Vancouver, ISO, and other styles

15

Huang, Jing, Zhenxiang Xu, Guoxiu Li, Cheng Qiu, and Haitao Huang. "An iterative learning control algorithm based on time varying pilot factor." Journal of Vibration and Control 25, no. 8 (February 2, 2019): 1484–91. http://dx.doi.org/10.1177/1077546318822369.

Full text

Abstract:

Owing to the control system being repetitive and nonlinear, a time-varying pilot factor control algorithm based on iterative learning control is proposed. The convergence of the TPF-ILC control algorithm is mathematically proven and the sufficient conditions are given. Thereafter, the initial state issue of iterative learning is explored, which is the critical issue of iterative learning control. The convergence of the system’s control error and the initial state of every single period have been mathematically proved by using continuous and repetitive properties of the system, even if the initial states of every single iterative learning period are not strictly the same. At the end of this paper, the TPF-ILC algorithm is applied in a hydraulic servo control system, and experimental results indicate the effectiveness and practicability of the TPF-ILC algorithm.

APA, Harvard, Vancouver, ISO, and other styles

16

Xu, Fengqiu, Kaiyang Zhang, and Xianze Xu. "Development of Magnetically Levitated Rotary Table for Repetitive Trajectory Tracking." Sensors 22, no. 11 (June 3, 2022): 4270. http://dx.doi.org/10.3390/s22114270.

Full text

Abstract:

The magnetic levitation system has been considered as a promising actuator in micromachining areas of study. In order to improve the tracking performance and disturbance rejection of the magnetically levitated rotary table, an iterative learning PID control strategy with disturbance compensation is proposed. The estimated disturbance compensates for the control signals to enhance the active disturbance rejection ability. The iterative learning control is used as a feed-forward unit to further reduce the trajectory tracking error. The convergence and stability of the iterative learning PID with disturbance compensation are analysed. A series of comparative experiments are carried out on the in-house, custom-made, magnetically levitated rotary table, and the experimental results highlight the superiority of the proposed control strategy. The iterative learning PID with disturbance compensation enables the magnetically levitated rotary table to realize good tracking performance with complex external disturbance. The proposed control strategy strengthens the applicability of magnetically levitated systems in the mechanism manufacturing area.

APA, Harvard, Vancouver, ISO, and other styles

17

Ruano, M. V., J. Ribes, J. Ferrer, and G. Sin. "Application of the Morris method for screening the influential parameters of fuzzy controllers applied to wastewater treatment plants." Water Science and Technology 63, no. 10 (May 1, 2011): 2199–206. http://dx.doi.org/10.2166/wst.2011.442.

Full text

Abstract:

In this paper, we evaluate the application of a sensitivity analysis to help fine-tuning a fuzzy controller for a biological nitrogen and phosphorus removal (BNPR) plant. The Morris Screening method is proposed and evaluated as a prior step to obtain the parameter significance ranking. First, an iterative procedure has been performed in order to find out the proper repetition number of the elementary effects (r) of the method. The optimal repetition number found in this study (r = 60) is in direct contrast to previous applications of the Morris method, which usually use low repetition number, e.g. r = 10 ∼ 20. Working with a non-proper repetition number (r) could lead to Type I error (identifying a not-important factor as significant (false positive)) as well as Type II error (identifying an important factor as not significant (false negative)), hence emphasizing the importance of finding the optimal repetition number for each study in question. With the proper r found, the Morris Screening helped identify the parameter significance ranking, thereby facilitating the calibration of fuzzy controllers, which contain many parameters that need to be adjusted for different wastewater treatment plant (WWTP) applications.

APA, Harvard, Vancouver, ISO, and other styles

18

Enjalbert, Patrice. "Sémantique des énoncés itératifs." Lingvisticæ Investigationes. International Journal of Linguistics and Language Resources 38, no. 1 (September 18, 2015): 133–82. http://dx.doi.org/10.1075/li.38.1.05enj.

Full text

Abstract:

This article is about the semantics of iterative statements, expressing repetition in time of a type-eventuality. With these statements are associated frequency properties, quantified by iterative adverbs (often, sometimes, sporadically, n times out of p…). Our purpose is to design a formal representation, with a method allowing to compute it from the text. The interpretation of an iterative statement closely relies on its information structure so that we first study precisely the topic-focus partition for a significant range of configurations. In the formal model, the occurrences of iterative eventualities or circumstants are represented by sequences of intervals. The temporal semantic of a sentence is then formalised as an instanciation of generic formulas using two types of generalised quantifiers.

APA, Harvard, Vancouver, ISO, and other styles

19

Wang, Lei, Mu Li, and Huizhong Yang. "Robust PD-Type Iterative Learning Control of Discrete Linear Repetitive Processes in the Finite Frequency Domain." Mathematics 8, no. 6 (June 18, 2020): 1004. http://dx.doi.org/10.3390/math8061004.

Full text

Abstract:

This paper studies a robust iterative learning control design for discrete linear repetitive processes in the finite frequency domain. Firstly, the state-space model of the iterative learning process is deduced. Then the dynamic performance condition of the control system in the finite frequency domain is derived by combining it with the stability theory of discrete linear repetitive processes. The system performances in the finite frequency domain are then transformed into the corresponding solutions of the linear matrix inequality by using the generalised KYP lemma. Finally, an integrated state feedback PD-type iterative learning control strategy is proposed. The robust control problem with norm-bounded uncertainty and convex polyhedral uncertainty are also considered in this paper. The simulation of the injection velocity in injection molding verified that the proposed methods in this paper are more effective than the P-type state feedback iterative learning control algorithm.

APA, Harvard, Vancouver, ISO, and other styles

20

Jia, Bingxi, Shan Liu, and Yi Liu. "Vision-Based Iterative Trajectory Tracking for Industrial Manipulators." Unmanned Systems 03, no. 04 (October 2015): 291–98. http://dx.doi.org/10.1142/s2301385015400051.

Full text

Abstract:

In industrial applications, industrial manipulators are generally used for repetitive tasks, and hence teach-playback strategy is generally used. However, classical teach-playback strategy needs the engineer directly operate the robot to do a demonstration, which takes great effort. In this paper, the task is formulated into a trajectory tracking problem, which uses teach-by-showing strategy, i.e., the engineer grasps the object with a camera on it to do a demonstration, during which a series of images are recorded as the desired trajectory. A vision-based iterative learning controller is proposed for the repetitive trajectory tracking task. System convergence is analyzed and simulation results are given to demonstrate the effectiveness, i.e., fairly accurate trajectory tracking is achieved.

APA, Harvard, Vancouver, ISO, and other styles

21

Ahmed, Hameeza, and Muhammad Ali Ismail. "REDUCER: Elimination of Repetitive Codes for Accelerated Iterative Compilation." Computing and Informatics 40, no. 3 (2021): 543–74. http://dx.doi.org/10.31577/cai_2021_3_543.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Longman, Richard W. "Iterative learning control and repetitive control for engineering practice." International Journal of Control 73, no. 10 (January 2000): 930–54. http://dx.doi.org/10.1080/002071700405905.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Trondhjem, Naja Blytmann. "Repetitive, iterative and habitual aspectual affixes in West Greenlandic." Acta Linguistica Hafniensia 44, no. 1 (May 2012): 64–76. http://dx.doi.org/10.1080/03740463.2011.735475.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Kimura, Harumi. "A case for iterative practice: Learner voices." Language Teacher 37, no. 5 (July 1, 2013): 32. http://dx.doi.org/10.37546/jalttlt37.5-10.

Full text

Abstract:

The term “practice” has not been popular in language classrooms since behaviourism went out of fashion. In this paper, however, I examined learners’ feedback on task repetition in order to promote the idea as an aid while learning to communicate in another language. Sixty Japanese students of English reflected on their classroom practice of oral interaction and produced focused essays on it. In the subsequent main study, to investigate further one of the most common themes identified in the students’ essays, task repetition, I interviewed three students and asked them what they thought of the iterative, interactive tasks I regularly employed in class. Their interview data provided support for repeated practice with more enjoyment, higher involvement, higher self-esteem, and lower anxiety. Repeated practice was supported not just by learning gains, as past research had demonstrated, but also by affective gains as this group of learners made a case for it. 「練習」は行動主義の衰退に伴って語学の授業では人気を失ってしまったようだが、学習者は繰り返すことをどのように考えているだろうか。本論では、まず60人の学習者にオーラル・コミュニケーションの授業で行う「繰り返し練習」について意見を求め、その後3人にインタビューを行った。学習者は、繰り返して練習することの楽しさ、参加度・自尊心の向上、逆に不安感の軽減などを挙げ、気持ちの面でも繰り返しが効果を持つことを語った。

APA, Harvard, Vancouver, ISO, and other styles

25

Jia, Jie, Khurram Shabbir, Khushdil Ahmad, Nehad Ali Shah, and Thongchai Botmart. "Strong Convergence of a New Hybrid Iterative Scheme for Nonexpensive Mappings and Applications." Journal of Function Spaces 2022 (March 19, 2022): 1–11. http://dx.doi.org/10.1155/2022/4855173.

Full text

Abstract:

In the article, we have proposed a new type of hybrid iterative scheme which is a hybrid of Picard and Thakur et al. repetitive schemes. This new hybrid iterative scheme converges faster than all leading schemes like Picard-S∗ hybrid, Picard-S, Picard-Ishikawa hybrid, Picard-Mann hybrid, Thakur et al. and Abbas and Nazir, S-iterative, Ishikawa and Mann iterative schemes for contraction mapping. By using the Picard-Thakur hybrid iterative scheme, we can find the solution of delay differential equations and also prove some convergence results for nonexpansive mapping in a uniformly convex Banach space.

APA, Harvard, Vancouver, ISO, and other styles

26

Wang, Lei, Liangxin Dong, Ruitian Yang, and Yiyang Chen. "Dynamic ILC for Linear Repetitive Processes Based on Different Relative Degrees." Mathematics 10, no. 24 (December 19, 2022): 4824. http://dx.doi.org/10.3390/math10244824.

Full text

Abstract:

The current research on iterative learning control focuses on the condition where the system relative degree is equal to 1, while the condition where the system relative degree is equal to 0 or greater than 1 is not considered. Therefore, this paper studies the monotonic convergence of the corresponding dynamic iterative learning controller systematically for discrete linear repetitive processes with different relative degrees. First, a 2D discrete Roesser model of the iterative learning control system is presented by means of 2D systems theory. Then, the monotonic convergence condition of the controlled system is analyzed according to the stability theory of linear repetitive process. Furthermore, the sufficient conditions of the controller existence are given in linear matrix inequality format under different relative degrees, which guarantees the system dynamic performance. Finally, through comparison with static controllers under different relative degrees, the simulation results show that the designed schemes are effective and feasible.

APA, Harvard, Vancouver, ISO, and other styles

27

op de Beke, Laura. "Premediating climate change in videogames: Repetition, mastery, and failure." Nordic Journal of Media Studies 3, no. 1 (June 1, 2021): 184–99. http://dx.doi.org/10.2478/njms-2021-0010.

Full text

Abstract:

Abstract This article starts with the observation that growth-oriented, techno-futurist narratives are predominant in climate change videogames. It then accounts for the lack of variety by arguing that these videogames are privileged expressions of premediation. Premediation cultivates a multiplicity of future scenarios, while at the same time delimiting them to suit presentist concerns, evoking a sense of inevitability and predictability strengthened by repetition. The iterative, branching temporality at work in this logic is deeply ingrained in videogames, as the trope of mastery through repetition and its analysis requires attentiveness to the affective dimensions of gameplay. If videogames are to engage with the climate crisis more productively, they must develop different temporalities in which the potentiality of the future is preserved. In this article, I analyse the games Fate of the World and The Stillness of the Wind to demonstrate how videogames premediate climate change and how they can explore other temporalities latent in the present.

APA, Harvard, Vancouver, ISO, and other styles

28

AL-ansari, Tahreer Moneer Sahib, and Asmaa Mohamed AL-Moqaram. "Iterative systems in sold structures and filigree structures / study in structural surface strategy." Association of Arab Universities Journal of Engineering Sciences 28, no. 2 (June 30, 2021): 69–85. http://dx.doi.org/10.33261/jaaru.2021.28.2.008.

Full text

Abstract:

The relationship between the structure and the shape in contemporary architecture has different formatsaccording to design and structural requirements. The integration is important formulas among these relationship, asthey form one unit in architecture, where the integration is characteristic by the important property which is theiterative system. One of the strategies to find iterative systems in contemporary architecture over traditional is calledstructural surface. Previous knowledge has been differed in explaining the functional of systems and it’smechanisms, especially in the relationship among the form and structure, so the problem has surfaced “the necessityto know the difference of the properties and types of iterative systems among solid and perforated structures withinthe structural surface strategy, and it’s role between the form and the structure”. to achieve the research’s goal “whatare the repetition and iterative systems in contemporary architectural structure and it’s role to determine the shape ofthe relationship among the structure and the form for building of different heights “, which has depended ondescriptive analytical method in three stage after defining the repetition in general, iterative system in particular andprevious knowledge criticism. First stage has focused on building a theoretical framework (characteristics and typesof the iterative systems in contemporary architectural structure and structural surface strategy). Second stage hasfocused on knowing the levels of the relationship among the form and the structure, By studying selected sampleswithin building of different height In addition to determine the important basic assumption of the research ,which is(iterative systems is differ in architectural structure (solid and perforated) , through characteristics of the iterativesystems with the system and the relationship of the surrounding environment according to it’s height (high ,medium)and it’s formation method (orthogonal ,free) ) . Third stage has focused on analyzing the results and conclusions as inthe role of the iterative systems (structural surface strategy) in producing the solid structures by adopting therepetition of the structural elements and generative rules in perforated structures, and use it to achieve a fusionamong the form and the structure to produce structures with efficiency and aesthetic appearance and structures thatreflect movement and dynamism. The level of this relationship are :( first: the compositionl, through theorganizational depth of the architectural structure. Second: the expressive, by finding three types of the relationshipare (the merging, the discrete, and the hybrid).

APA, Harvard, Vancouver, ISO, and other styles

29

Liu, Chang Rong, and Jin Xue Xu. "A Series Connection Scheme of Iterative Learning Control Based on Disturbance Observer." Applied Mechanics and Materials 182-183 (June 2012): 1041–45. http://dx.doi.org/10.4028/www.scientific.net/amm.182-183.1041.

Full text

Abstract:

In order to reject non-repetitive disturbance and improve the performance of iterative learning control, a series connection of feedback controller and ILC system with disturbance observer is presented. The random disturbance and uncertain model in ILC are studied. The simulation experiments indicate that DOB can reject non-disturbance and decrease the affect of uncertain model in ILC. The system is verified to be effective for promoting tracking performance and rejecting the non-repetitive disturbance in ILC.

APA, Harvard, Vancouver, ISO, and other styles

30

Cao, Zhixing, Ridong Zhang, Yi Yang, Jingyi Lu, and Furong Gao. "Discrete-Time Robust Iterative Learning Kalman Filtering for Repetitive Processes." IEEE Transactions on Automatic Control 61, no. 1 (January 2016): 270–75. http://dx.doi.org/10.1109/tac.2015.2434073.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Cao, Zhixing, Hans-Bernd Durr, Christian Ebenbauer, Frank Allgower, and Furong Gao. "Iterative Learning and Extremum Seeking for Repetitive Time-Varying Mappings." IEEE Transactions on Automatic Control 62, no. 7 (July 2017): 3339–53. http://dx.doi.org/10.1109/tac.2016.2633724.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Phan, Minh Q., Richard W. Longman, Benjamas Panomruttanarug, and Soo Cheol Lee. "Robustification of iterative learning control and repetitive control by averaging." International Journal of Control 86, no. 5 (May 2013): 855–68. http://dx.doi.org/10.1080/00207179.2013.764576.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Huang, Yi Cheng, Shu Ting Li, and Kuan Heng Peng. "Precision Motion of Iterative Learning Controller Using Adaptive Filter Bandwidth Tuning by Improved Particle Swarm Optimization Technique." Applied Mechanics and Materials 376 (August 2013): 349–53. http://dx.doi.org/10.4028/www.scientific.net/amm.376.349.

Full text

Abstract:

This paper utilized the Improved Particle Swarm Optimization (IPSO) technique for adjusting the gains of PID and the bandwidth of zero-phase Butterworth Filter of an Iterative Learning Controller (ILC) for precision motion. Simulation results show that IPSO-ILC-PID controller without adaptive bandwidth filter tuning have the chance of producing high frequencies in the error signals when the filter bandwidth is fixed for every repetition. However the learnable and unlearnable error signals should be separated for bettering control process. Thus the adaptive bandwidth of a zero phase filter in ILC-PID controller with IPSO tuning is applied to one single motion axis of a CNC table machine. Simulation results show that the developed controller can cancel the errors efficiently as repetition goes. The frequency response of the error signals is analyzed by the empirical mode decomposition (EMD) and the Hilbert-Huang Transform (HHT) method. Errors are reduced and validated by ILC with adaptive bandwidth filtering design.

APA, Harvard, Vancouver, ISO, and other styles

34

Zhou, Longhui, Hongfeng Tao, Wojciech Paszke, Vladimir Stojanovic, and Huizhong Yang. "PD-Type Iterative Learning Control for Uncertain Spatially Interconnected Systems." Mathematics 8, no. 9 (September 7, 2020): 1528. http://dx.doi.org/10.3390/math8091528.

Full text

Abstract:

This paper puts forward a PD-type iterative learning control algorithm for a class of discrete spatially interconnected systems with unstructured uncertainty. By lifting and changing the variable of discrete space model, the uncertain spatially interconnected systems is converted into equivalent singular system, and the general state space model is derived in view of singular system theory. Then, the state error and output error information are used to design the iterative learning control law, transforming the controlled system into an equivalent repetitive process model. Based on the stability theory of repetitive process, sufficient condition for the stability of the system along the trial is given in the form of linear matrix inequalities (LMIs). Finally, the effectiveness of the proposed algorithm is verified by the simulation of ladder circuits.

APA, Harvard, Vancouver, ISO, and other styles

35

Jiang, Wei, Gang Zhu, and Ying Zheng. "Iterative Learning Control for AGV Drive Motor Based on Linear Extended State Observer." Machines 9, no. 12 (November 29, 2021): 324. http://dx.doi.org/10.3390/machines9120324.

Full text

Abstract:

In order to solve the problems of repetitive and non-repetitive interference in the workflow of Automated Guided Vehicle (AGV), Iterative Learning Control (ILC) combined with linear extended state observer (LESO) is utilized to improve the control accuracy of AGV drive motor. Considering the working conditions of AGV, the load characteristics of the drive motor are analyzed with which the mathematical model of motor system is established. Then the third-order extended state space equations of the system approximate model is obtained, in which LESO is designed to estimate the system states and the total disturbance. For the repeatability of AGV workflow, ILC is designed to improve the control accuracy. As the goods mass transported each time is not same, the LESO is utilized to estimate the non-repetitive load disturbance in real time and compensate the disturbance of the system to improve the position precision. The convergence of the combined algorithm is also verified. Simulation and experimental results show that the proposed iterative learning control strategy based on LESO can reduce the positioning error in AGV workflow and improve the system performance.

APA, Harvard, Vancouver, ISO, and other styles

36

Riaz, Saleem, Hui Lin, Farkhanda Afzal, and Ayesha Maqbool. "Design and Implementation of Novel LMI-Based Iterative Learning Robust Nonlinear Controller." Complexity 2021 (April 15, 2021): 1–13. http://dx.doi.org/10.1155/2021/5577241.

Full text

Abstract:

An iterative learning robust fault-tolerant control algorithm is proposed for a class of uncertain discrete systems with repeated action with nonlinear and actuator faults. First, by defining an actuator fault coefficient matrix, we convert the iterative learning control system into an equivalent unknown nonlinear repetitive process model. Then, based on the mixed Lyapunov function approach, we describe the stability of the nonlinear repetitive mechanism on time and trial indices and have appropriate conditions for the repeated control system’s stability in terms of linear matrix inequality theory. Through LMI techniques, we have obtained satisfactory results and controller stability, and robustness against fault tolerance is also discussed in detail. Finally, the simulation results of the output tracking control of the two exemplary models verify the effectiveness of the proposed algorithm.

APA, Harvard, Vancouver, ISO, and other styles

37

Yu, Wenchao, Weimin Su, Hong Gu, Jianchao Yang, and Xingyu Lu. "Coherent integration algorithm for random pulse repetition interval radar based on iterative adaptive approach." Electronics Letters 56, no. 22 (October 29, 2020): 1208–10. http://dx.doi.org/10.1049/el.2020.2197.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Wang, Ying Chung, Chiang Ju Chien, and Chi Nan Chuang. "Backstepping Adaptive Iterative Learning Control for Robotic Systems." Applied Mechanics and Materials 284-287 (January 2013): 1759–63. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.1759.

Full text

Abstract:

A backstepping adaptive iterative learning control for robotic systems with repetitive tasks is proposed in this paper. The backstepping-like procedure is introduced to design the AILC. A fuzzy neural network is applied for compensation of the unknown certainty equivalent controller. Using a Lyapunov like analysis, we show that the adjustable parameters and internal signals remain bounded, the tracking error will asymptotically converge to zero as iteration goes to infinity.

APA, Harvard, Vancouver, ISO, and other styles

39

Tescari Neto, Aquiles. "Advps habituais e advps frequentativos: ambos aspectuais quantificadores; modalizadores, só os habituais." Cadernos de Estudos Lingüísticos 51, no. 2 (July 14, 2011): 253–72. http://dx.doi.org/10.20396/cel.v51i2.8637215.

Full text

Abstract:

Comrie (1975) had already noticed that habitual and iterative/frequentative aspects used to be treated as instances of the same aspectual subtype by some papers available in general Linguistics literature. The author distinguishes such instances of the aspectual category by recognizing that habitual aspect expresses the occurrence of an event or state as characteristic of a period of time while iterative expresses the mere repetition of an event or state. Cinque (1999) takes the fact that the iterative aspect is under the scope of the habitual aspect to keep them in different functional projections in the split IP. In our paper, we take the inherently modal nature of habitual aspect (a possibility not available to the iteratives) to show that these instances of aspect must be treated as different manifestations of the aspect category, either on Semantics or on Syntactic grounds. In order to capture the modal nature of the habitual aspect adverbs, we base our analysis on Tescari Neto (2008)’s Tau Condition.

APA, Harvard, Vancouver, ISO, and other styles

40

Wang, Rongrong, Yangchun Wei, and Ronghu Chi. "Enhanced data-driven optimal iterative learning control for nonlinear non-affine discrete-time systems with iterative sliding-mode surface." Transactions of the Institute of Measurement and Control 42, no. 11 (January 28, 2020): 1923–34. http://dx.doi.org/10.1177/0142331219900593.

Full text

Abstract:

In this work, an enhanced data-driven optimal iterative learning control (eDDOILC) is proposed for nonlinear nonaffine systems where a new iterative sliding mode surface (ISMS) is designed to replace the traditional tracking error in the controller design and analysis. It is the first time to extend the sliding mode surface to the iteration domain for systems operate repetitively over a finite time interval. By virtual of the new designed ISMS, the control design becomes more flexible where both the time and the iteration dynamics can be taken into account. Before proceeding to the controller design, an iterative dynamic linear data model is built between two consecutive iterations to formulate the linear input-output data relationship of the repetitive nonlinear nonaffine discrete-time system. The linear data model is virtual and does not have any physical meanings, which is very different to the traditional mechanism mathematical model. In the sequel, the eDDOILC is proposed by designing an objective function with respect to the proposed two-dimensional ISMS. Rigorous proof is provided to show the convergence of the proposed eDDOILC method. Furthermore, the results have been extended to a multiple-input multiple-output (MIMO) nonaffine nonlinear discrete-time repetitive system. In general, the proposed eDDOILC is data-driven where no explicit model information is included. It is illustrated that the presented eDDOILC is effective when applied to the nonlinear nonaffine uncertain systems.

APA, Harvard, Vancouver, ISO, and other styles

41

Tao, Hongfeng, Yan Liu, and Huizhong Yang. "Output Information Based Fault-Tolerant Iterative Learning Control for Dual-Rate Sampling Process with Disturbances and Output Delay." Mathematical Problems in Engineering 2018 (2018): 1–15. http://dx.doi.org/10.1155/2018/7072032.

Full text

Abstract:

For a class of single-input single-output (SISO) dual-rate sampling processes with disturbances and output delay, this paper presents a robust fault-tolerant iterative learning control algorithm based on output information. Firstly, the dual-rate sampling process with output delay is transformed into discrete system in state-space model form with slow sampling rate without time delay by using lifting technology; then output information based fault-tolerant iterative learning control scheme is designed and the control process is turned into an equivalent two-dimensional (2D) repetitive process. Moreover, based on the repetitive process stability theory, the sufficient conditions for the stability of system and the design method of robust controller are given in terms of linear matrix inequalities (LMIs) technique. Finally, the flow control simulations of two flow tanks in series demonstrate the feasibility and effectiveness of the proposed method.

APA, Harvard, Vancouver, ISO, and other styles

42

Vermeulen, J. J. C. "A note on iterative arguments in a topos." Mathematical Proceedings of the Cambridge Philosophical Society 111, no. 1 (January 1992): 57–62. http://dx.doi.org/10.1017/s0305004100075150.

Full text

Abstract:

Intuitively, transfinite iteration is a repetitive process, which eventually reaches completion, but might need to progress through an infinite chain of steps before finally doing so. But whereas such a chain is always readily at hand in classical set theory in the form of ordinals, iterative arguments involving sets (i.e. objects) in a general topos have to depend on some intrinsic or naturally available inductive structure, say algebraic, which might not be associated with a (well-ordered) chain.

APA, Harvard, Vancouver, ISO, and other styles

43

Emelianova, Julia, Pavel Pakshin, and Mikhail Emelianov. "Stability of Switched Differential Repetitive Processes and Iterative Learning Control Design." IFAC-PapersOnLine 53, no. 2 (2020): 1456–61. http://dx.doi.org/10.1016/j.ifacol.2020.12.1931.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Alsubaie, Muhammad Ali, Zhonglun Cai, Chris T. Freeman, Paul L. Lewin, and Eric Rogers. "Repetitive and Iterative Learning Controllers Designed by Duality with Experimental Verification." IFAC Proceedings Volumes 41, no. 2 (2008): 3562–67. http://dx.doi.org/10.3182/20080706-5-kr-1001.00602.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Pipeleers, Goele, and Kevin L. Moore. "Unified Analysis of Iterative Learning and Repetitive Controllers in Trial Domain." IEEE Transactions on Automatic Control 59, no. 4 (April 2014): 953–65. http://dx.doi.org/10.1109/tac.2014.2298142.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Scheel, Mathias, Andreas Berndt, and Olaf Simanski. "Application of Iterative Learning Control for Repetitive Processes in Breathing Therapy." Current Directions in Biomedical Engineering 4, no. 1 (September 1, 2018): 21–24. http://dx.doi.org/10.1515/cdbme-2018-0006.

Full text

Abstract:

AbstractThe continuous positive airway pressure (CPAP) therapy is the gold standard to treat the obstructive sleep apnoea syndrome. This continuous pressure splints the upper respiratory tracts and prevents a collapse of the pharynx. If not being treated a collapse of the upper respiratory tracts reduces the blood oxygen concentration and increases the CO2 concentration leading to repeated sleep disruptions. Many CPAP-devices cannot maintain the reference pressure, which can lead to an uncomfortable perception for the patient. To reduce the pressure deviation in the mask we want to apply the Iterative Learning Control (ILC) method, because the breathing of the patient is a repetitive process - and at night the breathing patterns are even and recurring from breath to breath.

APA, Harvard, Vancouver, ISO, and other styles

47

Pakshin, Pavel, Julia Emelianova, Mikhail Emelianov, Krzysztof Galkowski, and Eric Rogers. "Passivity based stabilization of repetitive processes and iterative learning control design." Systems & Control Letters 122 (December 2018): 101–8. http://dx.doi.org/10.1016/j.sysconle.2018.09.003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Pakshin, Pavel, Julia Emelianova, Eric Rogers, and Krzysztof Gałkowski. "Repetitive process based stochastic iterative learning control design for linear dynamics." Systems & Control Letters 137 (March 2020): 104625. http://dx.doi.org/10.1016/j.sysconle.2020.104625.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Feng, Li, Meng Deng, Ke Zhang, and Shuiqing Xu. "Iterative Learning Scheme Based Sensor Fault Estimation for Nonlinear Repetitive System." IEEE Access 7 (2019): 110227–34. http://dx.doi.org/10.1109/access.2019.2927884.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Owens, D. H., E. Rogers, and K. L. Moore. "Analysis Of Linear Iterative Learning Control Schemes Using Repetitive Process Theory." Asian Journal of Control 4, no. 1 (October 22, 2008): 68–89. http://dx.doi.org/10.1111/j.1934-6093.2002.tb00334.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Repetition in iterature'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles