Academic literature on the topic 'Flatness conditions'

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Journal articles on the topic "Flatness conditions"

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Tandra‡, Haryono, and William Moran. "Flatness Conditions on Finitep-Groups." Communications in Algebra 32, no. 6 (2004): 2215–24. http://dx.doi.org/10.1081/agb-120037215.

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Lévine, J. "On flatness necessary and sufficient conditions." IFAC Proceedings Volumes 37, no. 13 (2004): 123–28. http://dx.doi.org/10.1016/s1474-6670(17)31210-7.

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Chetverikov, V. N. "New Flatness Conditions for Control Systems." IFAC Proceedings Volumes 34, no. 6 (2001): 191–96. http://dx.doi.org/10.1016/s1474-6670(17)35172-8.

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Tran, Thi Hong, Tran Ngoc Giang, Ngoc Vu Ngo, et al. "Optimizing Dressing Conditions for Minimum Flatness Tolerance when Grinding SKD11 Tool Steel." Materials Science Forum 1020 (February 2021): 83–90. http://dx.doi.org/10.4028/www.scientific.net/msf.1020.83.

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This study is to determine effects of the dressing parameters to the flatness tolerance (Fl) when grinding SKD11 steel using HaiDuong grinding wheel and also propose the suitable dressing parameters to obtain the smallest flatness tolerance. In this paper, the effects of the six input parameters including feed rate (S), depth of rough dressing cut (ar), rough dressing times (nr), depth of finish dressing cut (af), finish dressing times (nf) and non-feeding dressing (nnon) to the flatness tolerance were investigated. To find out the influence of each input parameter on output results, the S/N r
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OZTURK, Hakan. "On a-Kenmotsu manifolds satisfying flatness conditions." JOURNAL OF ADVANCES IN MATHEMATICS 11, no. 8 (2015): 5598–608. http://dx.doi.org/10.24297/jam.v11i8.1214.

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The main interest of the present paper is to study α-Kenmotsu manifolds that satisfy some certain tensor conditions where a is a smooth function defined by dα∧η=0 on Mⁿ. In particular, the flatness conditions of a-Kenmotsu manifolds are investigated. We conclude the paper with an example on a-Kenmotsu manifolds depending on a.
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Liang, Xingliang, and Roghaieh Khosravi. "Directed colimits of some flatness properties and purity of epimorphisms in S-posets." Open Mathematics 16, no. 1 (2018): 669–87. http://dx.doi.org/10.1515/math-2018-0061.

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AbstractLet S be a pomonoid. In this paper, we introduce some new types of epimorphisms with certain purity conditions, and obtain equivalent descriptions of various flatness properties of S-posets, such as strong flatness, Conditions (E), (E′), (P), (Pw), (WP), (WP)w, (PWP) and (PWP)w. Thereby, we present other equivalent conditions in the Stenström-Govorov-Lazard theorem for S-posets. Furthermore, we prove that these new epimorphisms are closed under directed colimits. Meantime, this implies that by a new approach we can show that most of flatness properties of S-posets can be transferred to
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Lévine, Jean. "On necessary and sufficient conditions for differential flatness." Applicable Algebra in Engineering, Communication and Computing 22, no. 1 (2010): 47–90. http://dx.doi.org/10.1007/s00200-010-0137-x.

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Wang, Peng Fei, Dian Hua Zhang, Xu Li, and Wen Xue Zhang. "A Robust Model for Work Roll Bending Control Reaching Threshold in Flatness Control of Cold Rolling Mill." Advanced Materials Research 145 (October 2010): 73–79. http://dx.doi.org/10.4028/www.scientific.net/amr.145.73.

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The work roll bending is one of the most effective flatness actuators in flatness control of cold rolled strips, as a result of its characteristics such as high speed response, powerful effects on the elimination of flatness defects such as edge-waves, central waves and so on. The existing research on flatness control mainly focuses on the calculation of optimal adjustment of individual flatness actuator. However, the final output of a flatness actuator is required to be limited firstly for some special cases. If the incoming strip is coming with big symmetrical flatness defects, it happens th
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Hirose, Kenji, and Toshiyuki Enomoto. "Optimization of Double-Sided Polishing Conditions to Achieve High Flatness: Consideration of Relative Motion Direction." International Journal of Automation Technology 3, no. 5 (2009): 581–91. http://dx.doi.org/10.20965/ijat.2009.p0581.

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Silicon (Si) wafers are the most commonly used substrates of semiconductor devices. The device design rule is miniaturization, and the device chip size is being increased to improve device integration, requiring that Si wafers be manufactured with higher flatness and larger diameters. The polishing used as a finishing process of Si wafers, however, has a serious problem; it is very difficult to set the appropriate conditions for polishing the Si wafer while wearing the polishing pad stably to high flatness. In our previous work, a method of optimizing polishing conditions based on kinematical
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Shiromizu, Tetsuya, and Maki Sugai. "Relaxation of local energy conditions due to asymptotic flatness." Physical Review D 51, no. 2 (1995): 472–76. http://dx.doi.org/10.1103/physrevd.51.472.

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Dissertations / Theses on the topic "Flatness conditions"

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Knoll, Carsten. "Regelungstheoretische Analyse- und Entwurfsansätze für unteraktuierte mechanische Systeme." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-209765.

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Die Arbeit ist der regelungstheoretischen Betrachtung von mechanischen Systemen mit mehr Freiheitsgraden als Stellgrößen gewidmet. Dabei werden Aspekte aus den Teilgebieten Modellbildung, Systemanalyse, Steuerungsentwurf und Reglerentwurf behandelt. Den Ausgangspunkt bilden die aus dem Lagrange-Formalismus resultierenden Bewegungsgleichungen, für welche neben verschiedene partiell linearisierten Zustandsdarstellungen auch eine spezielle Byrnes-Isidori-Normalform eingeführt wird. Im Unterschied zu einer früher vorgeschlagenen ähnliche Normalform existiert diese "Lagrange-Byrnes-Isidori-Normalf
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Kozhevnikov, Artem. "Propriétés métriques des ensembles de niveau des applications différentiables sur les groupes de Carnot." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112073/document.

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Nous étudions les propriétés métriques locales des ensembles de niveau des applicationshorizontalement différentiables entre des groupes de Carnot, c'est-à-dire différentiable par rapport à la structure sous-riemannienne intrinsèque.Nous considérons des applications dont la différentielle horizontale est surjective,et notre étude peut être vue comme une généralisation du théorème des fonctions implicites pour les groupes de Carnot.Tout d'abord, nous présentons deux notions de tangence dans les groupes de Carnot:la première basée sur la condition de platitude au sens de Reifenberg et la deuxièm
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Knoll, Carsten. "Regelungstheoretische Analyse- und Entwurfsansätze für unteraktuierte mechanische Systeme." Doctoral thesis, 2016. https://tud.qucosa.de/id/qucosa%3A29777.

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Die Arbeit ist der regelungstheoretischen Betrachtung von mechanischen Systemen mit mehr Freiheitsgraden als Stellgrößen gewidmet. Dabei werden Aspekte aus den Teilgebieten Modellbildung, Systemanalyse, Steuerungsentwurf und Reglerentwurf behandelt. Den Ausgangspunkt bilden die aus dem Lagrange-Formalismus resultierenden Bewegungsgleichungen, für welche neben verschiedene partiell linearisierten Zustandsdarstellungen auch eine spezielle Byrnes-Isidori-Normalform eingeführt wird. Im Unterschied zu einer früher vorgeschlagenen ähnliche Normalform existiert diese "Lagrange-Byrnes-Isidori-Normalf
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(8300103), Shams R. Rahmani. "Digital Soil Mapping of the Purdue Agronomy Center for Research and Education." Thesis, 2020.

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This research work concentrate on developing digital soil maps to support field based plant phenotyping research. We have developed soil organic matter content (OM), cation exchange capacity (CEC), natural soil drainage class, and tile drainage line maps using topographic indices and aerial imagery. Various prediction models (universal kriging, cubist, random forest, C5.0, artificial neural network, and multinomial logistic regression) were used to estimate the soil properties of interest.
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Books on the topic "Flatness conditions"

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Deruelle, Nathalie, and Jean-Philippe Uzan. Inflationary models of the primordial universe. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198786399.003.0060.

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This chapter addresses the problem of fine-tuning the initial conditions of the previous chapter’s hot Big Bang model, so that the universe has the observed properties, as well as the problem of the origin of large-scale structure. It shows that these problems are related to each other, and can be solved by assuming a period of accelerated expansion in the earliest history of the universe. Since the 1980s, the general acceptance of this idea of a primordial inflationary phase can be considered as the third phase in the history of the development of relativistic cosmology. The chapter first out
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Book chapters on the topic "Flatness conditions"

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Tsybulskyi, Vitalii. "IMPROVEMENT OF CALCULATION METHOD OF ROAD PAVEMENT EMBANKMENT ON THE APPROACHES TO ROAD BRIDGES." In Integration of traditional and innovation processes of development of modern science. Publishing House “Baltija Publishing”, 2020. http://dx.doi.org/10.30525/978-9934-26-021-6-41.

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The laws of unsaturated and capillary movement of water in soils are analyzed, which are complex and insufficiently studied, but significantly affect the condition of the ground. Experience in the design and construction of the subsoil has shown that during the excavation works can significantly change the conditions of soils and their water-thermal regime. Therefore, the characteristics of soils used in stability calculations should be determined taking into account the subsequent condition of the soil in the conditions of occurrence, as well as the possible change of these conditions during construction and maintenance. One of the urgent tasks is to improve the methods of regulating the water-thermal regime of roads. By changing the conditions of its course or the type of water-thermal regime itself, significant successes can be achieved in improving the maintenance of roads, engineering and transport facilities. Dangerous effect of these factors on the embankment of the ground is manifested in the formation of wetting, wetting of the soil and layers of pavement, resulting in reduced density, strength of soils, subsidence, swelling and loss of continuity due to cracking. As a result, the strength of the road structure, the flatness of the carriageway, the durability of the pavement and the adhesion of the wheels to the roadway are reduced. The most dangerous for roads are moisture accumulation, freezing, thawing of the ground, intensive heating and intensive cooling of the layers of pavement. The analysis of regularities of formation of a water-thermal regime of a ground and its regulation at the expense of the device of optimum capillary-interrupting layers is carried out. The laws of soil moisture when raising capillary water showed that when the layer of the embankment with a high coefficient of impregnation is dehydrated over the layer with a lower coefficient, the speed of moving capillary water into the upper soil layers drops sharply. This fall occurs as a result of changes in the relationship between the driving forces of the menisci and the forces of resistance of capillary water in the soil. The process of unsaturated movement of water in the soil is determined by the combination of many factors that characterize the capillary system of the soil. The calculation uses complex indicators of soil water movement conditions, which are established experimentally for each variety and soil density at optimal humidity, as well as water filtration coefficients in the soil. To establish the relationship between these experimental data and the required values that determine the capillary system of the soil, the filtration of water in the soil was considered. Determining the optimal capillary system of the soil and establishing the unstable distribution of own capillary water in the structures of high embankments will ensure the strength of approaches to road bridges. The method of calculating the determination of the optimal composition of the road layers taking into account the processes of water-thermal regime and capillary movement of water has been improved. The algorithm of calculation in the program Microsoft Excel for selection of optimum structure of a ground cloth of a high embankment on approaches to automobile bridges is offered.
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Millérioux, Gilles, and José Maria Amigó. "Control-theoretical Concepts in the Design of Symmetric Cryptosystems." In Chaos Synchronization and Cryptography for Secure Communications. IGI Global, 2011. http://dx.doi.org/10.4018/978-1-61520-737-4.ch016.

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In this chapter, it is shown how control-theoretical concepts can be useful in the design of symmetric cryptosystems. The authors first provide some background on cryptography with special emphasis on symmetric ciphering and, more specifically, on stream ciphers. It is explained how some permutation or substitution primitives can be derived from chaotic dynamical systems for cryptographic purposes. After a review of the most popular synchronization-based cryptosystems, a comparative study between these chaotic cryptosystems and the conventional symmetric ciphers, specifically stream ciphers, is carried out. In particular, it is shown that message-embedded chaotic ciphers and conventional self-synchronizing stream ciphers are structurally equivalent under the so-called flatness condition, a condition borrowed from control theory.
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De Blij, Harm. "Globals, Locals, and Mobals." In The Power of Place. Oxford University Press, 2008. http://dx.doi.org/10.1093/oso/9780195367706.003.0005.

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Earth may be a planet of shrinking functional distances, but it remains a world of staggering situational differences. From the uneven distribution of natural resources to the unequal availability of opportunity, place remains a powerful arbitrator. Many hundreds of millions of farmers in river basins of Asia and Africa live their lives much as their distant ancestors did, still remote from the forces of globalization, children as well as adults still at high personal risk and great material disadvantage. Tens of millions of habitants of isolated mountain valleys from the Andes to the Balkans and from the Caucasus to Kashmir are as bound to their isolated abodes as their forebears were. Of the seven billion current passengers on Cruiseship Earth, the overwhelming majority (the myth of mass migration notwithstanding) will die very near the cabin in which they were born. In their lifetimes, this vast majority will have worn the garb, spoken the language, professed the faith, shared the health conditions, absorbed the education, acquired the attitudes, and inherited the legacy that constitutes the power of place: the accumulated geography whose formative imprint still dominates the planet. The regional impress of poverty continues to trap countless millions who are and will be born into it and who, globalization notwithstanding, cannot escape it. The “wealth gap” between the fortunate and the less fortunate, still largely a matter of chance and destiny, evinces a widening range resulting from the perpetuation of privilege and power in the so-called global “core” and its international tentacles. Those disparities, represented at all levels of scale, will entail increasing risk in a world of rising anger and weapons of growing destructive efficiency. At the same time, the notion that the world, if not “flat,” is flattening under the impress of globalization is gaining traction. As noted in the preface, the idea that diversities of place continue to play a key role in shaping humanity’s variegated mosaic tends to be dismissed by globalizers who see an increasingly homogenized and borderless world. “Flatness” is becoming an assumption, not merely a prospect, as implied by the titles of numerous books and articles of recent vintage (Fung et al., 2008).
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Rigatos, Gerasimos, and Argyris Soldatos. "Structural Condition Monitoring with the Use of the Derivative-Free Nonlinear Kalman Filter." In Advances in Computational Intelligence and Robotics. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-7387-8.ch013.

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The chapter proposes structural condition monitoring for buildings and mechanical structures using a new nonlinear filtering method under the name Derivative-Free Nonlinear Kalman Filtering. The filter makes use of exact linearization of the structure's dynamical model in accordance to differential flatness theory and of an inverse transformation that enables one to obtain estimates for the state vector elements of the initial model. The response of the structure is compared to the response generated by the filter under the assumption of a damage-free model. Moreover, the filter provides estimates of the state vector elements of the structure, which cannot be directly measured, while it can also give estimates of unknown excitation inputs. By comparing the two signals, residuals sequences are generated. The statistical processing of the residuals provides an indication about the existence of parametric changes (damages) in the structure that otherwise could not have been detected.
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Conference papers on the topic "Flatness conditions"

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Cagan, Jonathan, and Brian C. Williams. "First-Order Necessary Conditions for Robust Optimality." In ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0344.

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Abstract The first-order necessary conditions of optimality are extended to include information about robust design — cost insensitivity to model inaccuracies and changes in design specification, as well as the manufacturing tolerances treated in more traditional approaches. In these extended conditions, the Lagrangian is formulated as a tradeoff between cost and cost variability, where variability is measured as the flatness and curvature of the objective relative to local variations in design variables and constraints. During optimization these conditions allow cost and robustness to be cons
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Hirose, Kenji, and Toshiyuki Enomoto. "Achievement of High Flatness of Large Diameter Silicon Wafer in Double-Sided Polishing: Optimization of Polishing Conditions Considering Relative Motion Direction." In ASME 2009 International Manufacturing Science and Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/msec2009-84055.

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Silicon (Si) wafers are the most commonly used substrates for manufacturing semiconductor devices. The design rule is miniaturized, and the chip size is increasing to improve the degree of the device integration. Then Si wafer is required to be manufactured with the higher flatness and larger diameter to meet above demands. The double-sided polishing is widely adopted as the finishing process of the wafer manufacturing, because the wafers with the good surface quality and flatness can be obtained economically. However, the polishing technology has serious problems: It is very difficult to set
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Villagra, J., D. Herrero-Perez, and M. Abderrahim. "Robust flatness-based control of an AGV under varying load and friction conditions." In 2009 IEEE International Conference on Control and Automation (ICCA 2009). IEEE, 2009. http://dx.doi.org/10.1109/icca.2009.5410339.

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Victor, Stephane, Pierre Melchior, and Alain Oustaloup. "Flatness necessary and sufficient conditions for nonlinear fractional systems using fractional differential forms." In 2009 European Control Conference (ECC). IEEE, 2009. http://dx.doi.org/10.23919/ecc.2009.7074518.

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Paiva, Fabricio Mazola da Silva, Antonio Adel dos Santos, Vicente Tadeu Lopes Buono, and Carmos Antonio Gandra. "INFLUENCE OF ACCELERATED COOLING CONDITIONS ON MICROSTRUCTURE AND FLATNESS OF API STEEL HEAVY PLATES." In 56° Seminário de Laminação e Conformação de Metais. Editora Blucher, 2019. http://dx.doi.org/10.5151/2594-5297-32315.

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Manna, Marcello, and Raffaele Tuccillo. "Optimum Aero-Thermal Design of Turbomachinery Blading Systems Accounting for Variable Operating Conditions." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38629.

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The paper presents further developments to a recently proposed innovative procedure specifically conceived for the aero-thermal design of high performance turbomachinery cascades. The method, applied to an existing nozzle guide vane for which extensive and detailed experimental data are available, is demonstrated capable of increasing in an integral sense the overall blade performance. The latter are generalized to account for part and over load flow conditions. This is accomplished by formulating the design objectives in terms of a multiple point minimization procedure whose associated cost f
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Tang, Chin Pei, Patrick T. Miller, Venkat N. Krovi, Ji-Chul Ryu, and Sunil K. Agrawal. "Kinematic Control of Nonholonomic Wheeled Mobile Manipulator: A Differential Flatness Approach." In ASME 2008 Dynamic Systems and Control Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/dscc2008-2253.

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This paper presents an integrated motion planning and control framework for a nonholonomic wheeled mobile manipulator (WMM) system taking advantage of the (differential) flatness property. We first develop the kinematic model of the system and analyze its flatness properties. Subsequently, a statically feedback linearizable system description is developed by appropriately choosing the flat outputs. Motion-planning can now be achieved by polynomial curve fitting to satisfying the terminal conditions in the flat output space while control design reduces to a pole-placement problem for a linear s
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Park, D. S., V. Singh, B. H. You, et al. "Control of Internal Stress for High Quality Nickel Large Area Mold Inserts." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11639.

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Metallic large area mold inserts (LAMIs) are essential for the replication of polymer microfluidic devices. Successful molding of micro- or nanoscale features over large areas is dependent on improving the dimensional control of the mold inserts, particularly those fabricated by electrodeposition using the LIGA or UV-LIGA processes. A systematic approach to controlling the internal stress of the nickel deposits, which was essential for predicting the final flatness of the LAMIs prior to electroplating, was carried out. The internal stress of the nickel deposits from a nickel sulfamate solution
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Kumar, Rumit, Alireza Nemati, Manish Kumar, Rajnikant Sharma, Kelly Cohen, and Franck Cazaurang. "Tilting-Rotor Quadcopter for Aggressive Flight Maneuvers Using Differential Flatness Based Flight Controller." In ASME 2017 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dscc2017-5241.

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In this paper, we present a feed-forward control approach for complex trajectory tracking by a tilting-rotor quadcopter during autonomous flight. Tilting-rotor quadcopter is a more agile version of conventional quadcopter as the propeller motors are actuated to tilt about the quadcopter arm. The tilt-rotor quad-copter is capable of following complex trajectories with ease. In this paper, we employ differential flatness based feed-forward position control by utilizing a combination of propeller rotational speeds along with rotor tilts. The rotational motion of propellers work simultaneously in
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Abootorabi Zarchi, M. Mahdi, M. R. Razfar, and A. Abdullah. "Experimental Investigation of Chip Formation and Surface Topology in Ultrasonic-Assisted Milling of X20Cr13 Stainless Steel." In ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1115.

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In the present paper, by using longitudinal one dimensional ultrasonic vibrations, characteristics of side milling of X20Cr13 martensitic stainless steel has been investigated. In order to experimentally investigate the chip formation and machined surface topology of workpiece, conventional milling (CM) and ultrasonic-assisted milling (UAM) processes have been applied and compared in certain cutting conditions. Imaging by digital microscope shows that applying ultrasonic vibrations on milling process leads to thinner and smaller formed chips and it also makes machined surface of workpece flatt
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