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Dissertations / Theses on the topic 'Machine control system'
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1
Kanburoglu, Furkan A. "Distributed Control System For Cnc Machine Tools." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610599/index.pdf.
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&ldquo<br>Numerically Controlled&rdquo<br>(NC) machine tools, which are automatically operated by encoded (digital) commands, are capable of machining components with quality and quantity. Manufacturing industry heavily depends on these machines. Many different control architectures have been adapted in today&rsquo<br>s CNC technology. Centralized control system is quite popular in industry due to its ease of implementation. If the number of controlled axes on a CNC machine tool (><br>3), increases so does the computational burden on the central processors. Hence, more powerful processors are needed. An alternative architecture, which is not commonly used in CNC technology, is the decentralized (distributed) control. In this topology, the tasks handled by the distributed controllers that are interconnected to each other by a communication network. As the need arises, a new controller can be added easily to the network without augmenting the physical configuration. Despite its attractive features, this architecture has not been fully embraced by the CNC industry. Synchronization among the axes in the coordinated motion is proven to be quite challenging.
In this thesis, alternative distributed controller architecture was proposed for CNC machine tools. It was implemented on a 3-axis CNC milling machine. Open-loop control performance was investigated under various conditions. Different communication protocols along with different physical communication interfaces and a number of controller hardware were devised. An industry-standard network (RS-485) was set up by interconnecting these distributed controllers. Different data transmission protocols were devised in order to establish appropriate communication methods. Also, computer software (a.k.a. graphical user interface), which can coordinate the interconnected controllers, interpret NC part programs and generate reference position data for each axis, was designed within the scope of this thesis.
2
Lee, Kwangduk Douglas 1970. "Axiomatic development of a machine control system." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/8821.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.<br>Includes bibliographical references (leaf 140).<br>Axiomatic Design is presented as a scientific methodology in designing a complex machine control system. As an example, the CMP a machine control system is developed using the Axiomatic Design framework. The machine is a type of semiconductor processing equipment, which requires numerous actuators and sensors and the intelligent control of them to planarize thin layers of wafers. Signal processing modules, control algorithms, sequential process steps, graphical user interface, process recipe editor and the overall control system structure are all designed by the Axiomatic decomposition. Axiomatic Design is proved to be a very effective tool in control system development. It took less than six months to develop the system and the control system is fully functional without any major error or mistake. The resulting system is clear to understand, easy to maintain and upgrade, and flexible for further development and integration. Although the development has been specific to the CMP cc machine, the control system structure and the design methodologies presented in this thesis are universally applicable to the development of any type of machine control system.<br>by Kwangduk Douglas Lee.<br>S.M.
3
Chen, Xi. "Component-based control system development for agile manufacturing machine systems." Thesis, De Montfort University, 2003. http://hdl.handle.net/2086/13263.
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It is now a common sense that manufactures including machine suppliers and system integrators of the 21 st century will need to compete on global marketplaces, which are frequently shifting and fragmenting, with new technologies continuously emerging. Future production machines and manufacturing systems need to offer the "agility" required in providing responsiveness to product changes and the ability to reconfigure. The primary aim for this research is to advance studies in machine control system design, in the context of the European project VIR-ENG - "Integrated Design, Simulation and Distributed Control of Agile Modular Machinery".
4
Yang, Xue Jiao. "Supervisory wide-area control for multi-machine power system." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/supervisory-widearea-control-for-multimachine-power-system(6c0575f9-7b20-4751-9d67-276aaaa4c7b2).html.
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With the increasing demand for electrical power and the growing need for the restructuring of the power industry, electric power systems have become highly complex with inherent complicated dynamics. Therefore, the study of power system stability has continued to receive significant attention from both academic researchers and industrial practitioners. This thesis focuses on supervisory wide-area control for rotor angle stability of multi-machine power systems using Linear Quadratic Gaussian/Loop Transfer Recovery (LQG/LTR) control theory with guaranteed robustness. The supervisory controllers are developed in both continuous-time and discrete-time framework and their performances and robustness are assessed using both frequency-domain tools, and time-domain simulation results. The impact of the communication time-delays that commonly exist in wide-area power system control on the performance and robustness of the closed-loop system is investigated. In particular, different methods of incorporating such time-delays into the design of the supervisory LQG controller are considered. This thesis proposes a modified supervisory LQG controller that utilizes the Extended Kalman Filter to estimate the unknown/varying time-delays. Simulation results obtained using numerical examples involving non-linear power system models demonstrate the benefits of the proposed scheme for both time-invariant and time-varying delays. The resulting supervisory control scheme is well suited for maintaining power system stability in the presence of communication time-delays.
5
Parsons, Erin M. "Control system design for a continuous passive motion machine." Connect to resource, 2010. http://hdl.handle.net/1811/45477.
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Abdulkareem, Alaa Adnan. "Modelling, simulation and control of a PTC machine hall." Thesis, University West, Department of Technology, Mathematics and Computer Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-1347.
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<p>In this master thesis a flexible manufacturing system for a PTC machine hall has been modelled and simulated using RobCad. This system includes several equipments and machines which have been modelled and arranged to come up with three possible layouts. The machine hall in UW will be moved to a new place in Innovatum (a research area in Trollhättan). The machines were chosen from the existing machine hall according to UW requirements in order not to buy new machines because of economic reasons. The number of cells was also set by UW. The machines and equipments that will be moved are; two CNC machines, three ABB robots, a 4-axis gantry robot which transport the materials between the cells and a conveyor or a flex link which has been proposed in this project for the loading/unloading station use. The purposes of moving the machine hall to Innovatum are: - More people will be able to use the machine hall (i.e. UW, other schools and costumers from other companies for training purposes). - The environment will be more available to do more production operations using the robots and machines. - It will be a good opportunity to develop the programs and software, for that will let UW be able to hire a whole automation package to the costumers. - Students will be nearby to the industries'9 environment and may have more contact with different companies. - Since the new machine hall will attract costumers it will gain incomes to UW. Three layouts have been proposed in this thesis work, and these layouts fulfil all or most of the requirements of the costumers and users.</p>
7
Mattie-Suleiman, Eman A. "Instrumentation and control of an industrial sewing machine." Thesis, De Montfort University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391336.
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曾坤明 and Kwan-ming Tsang. "Decoupling and stabilizing control of multi-machine power systems withstatic VAr compensators." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31211008.
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Thomas, David Andrew. "An adaptive control system for precision cylindrical grinding." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243279.
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Gao, Liliang. "Control of three-level 5-phase induction machine drive system." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510860.
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Chen, M. "Graphical man-machine interface for computer-aided control system design." Thesis, Swansea University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636241.
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The demands from control engineers for more user-friendly, reliable and powerful design tools led to the necessity for a computer-aided control system design environment, which incorporates a general purpose graphical man-machine interface, a common database and a toolbox for modelling, analysis and simulation of control systems in pictorial representations as well as numerical ones. The work presented herein is mainly concerned with the development of such an environment, particularly the computer-aided design techniques used for modelling and manipulating pictorial representations of control systems. The infrastructure and major components of an environment have been studied. A general graphical man-machine interface and a set of graphical editors have been developed, allowing control engineers to interact graphically with the computer to construct pictorial representations of control systems such as block diagrams and signal flow graphs. In order to handle objects efficiently in the graphical editors, point inclusion algorithms, a classic problem in computer graphics and computational geometry, has been studied. Efficient and consistent point-in-polygon and point-in-polyhedron algorithms have been designed and developed. Artificial intelligence techniques have been applied to the problems in manipulating the pictorial representations of control systems, most of which would be found rather difficult to be solved using conventional programming techniques. The problems which have been studied include the methods for representing and manipulating diagraphs in an artificial intelligence oriented programming environment, structural controllability and observability, digraph numbering, algorithms for transformation between block diagrams and signal flow graphs, and automatic layout of block diagrams and signal flow graphs. This work is closely linked with the implementation of CES (ControlEngineering workStation) - a computer-aided control system design environment developed in the University College of Swansea.
12
Dunkler, Olaf. "Human aided control of a flexible machining system." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/25663.
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Yu, Xing. "Control aspects of a high performance induction machine drive with parameter identification." Thesis, Heriot-Watt University, 2000. http://hdl.handle.net/10399/1229.
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Baxter, Michael Scott. "An Open Architecture for Versatile Machine and Actuator Control." BYU ScholarsArchive, 2004. https://scholarsarchive.byu.edu/etd/793.
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Automatic control technology increases usability, reliability and productivity in manufacturing, transportation, and climate control. There are many additional areas of modern life that could benefit through automatic control; however, current automation components are too expensive or aren't sufficiently flexible. For example, the cost of current commercial motion control components precludes their use in an average home. This thesis describes an automatic control methodology that is low cost and is flexible enough for a wide variety of control applications. Typical applications could include:
- Home lighting, security and appliances
- Commercial building heating, ventilation and air conditioning
- Industrial machine tool and process control
This automation methodology eliminates several expensive and inflexible aspects of present-day industrial automation. This is accomplished by implementing application-specific control algorithms in software run on a generic computer rather than on purpose-built hardware. This computer calculates control values for each control application connected to it via real-time communication network. This technique is similar to that of a desktop PC. When using a peripheral device, such as a printer or scanner, the PC executes device driver software to calculate control values for the devices. These values are communicated to the device over a shared bus. The automation methodology described here seeks to emulate this software-based control paradigm. This methodology reduces cost and increases flexibility in two ways. First, it eliminates application-specific control hardware and replaces it with software. This reduces the cost by eliminating the need for unique, proprietary control hardware for each product or system. Second, the software approach increases flexibility. For example, one could download a new clothes washing machine cycle via the Internet. Software control provides considerable freedom in designing and implementing control systems by allowing the designer to change system functionality without having to replace or modify hardware or even be present at the location where the control system is used. This thesis describes the development of this new control methodology. To validate its performance a home automation system is implemented. This implementation included control of laundry appliances, lighting, TV and other common household devices.
15
Brander, Pär. "Inventory control and scheduling problems in a single-machine multi-item system/." Luleå : Luleå tekniska universitet/Industriell ekonomi och samhällsvetenskap/Industriell logistik, 2006. http://epubl.ltu.se/1402-1544/2005/55/.
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Aykac, Emel Sinem. "Development Of A Scada Control System For A Weighing And Bagging Machine." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611857/index.pdf.
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In this thesis study, a prototype is designed in order to improve the weighing
accuracy of the weighing and packaging machine that used in sugar factories. The
unavoidable factory conditions cause weighing and packaging machine to do
weighing errors. In order to correct these errors, the prototype produced in this study
was designed as a quality control unit which will take the excess sugar and fill the
deficient sugar in the sacks. Because of being small and having an easy installation,
the application of the prototype was done considering 1-kilogram bags rather than
available 50-kilogram ones.
So as to correct the faulty weighing, sugar extraction and filling processes are
provided from a bunker which is designed on the basis of data obtained by statistical
analysis. For suction, vacuum is used and filling is realized by a ball valve. Upwards
and downwards movement of the bunker is carried out with a pneumatic cylinder.
Weighing information is received via a load cell and an indicator. Control of all these
devices is provided by PLC hardware and SCADA interface.
17
Mu, Bin. "System modelling, identification and coordinated control design for an articulated forestry machine." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27245.
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This thesis describes the modelling of electrohydraulic actuation systems of a prototype forestry vehicle, the experimental identification of the dynamic models parameters and control strategies for forestry operations.<br>The linear graph method is selected to derive comprehensive models of three electrohydraulic actuation subsystems, i.e. the swing, boom and stick subsystems, on the vehicle based on modelling of individual components. A new approach is proposed, then, to integrate rigid-body dynamic models with the actuator dynamic models to result in a complete machine model.<br>Off-line parameter identification procedures are used, including the least-square method. A series of experiments is performed to obtain numerical values for the parameters involved in the system models. The experimental setups are described in detail and new procedures are explained. The model validation studies show that the mathematical models closely represent the dynamic characteristics of the forestry machine.<br>The concept of coordinated control in teleoperation is studied. The resolved motion rate control strategy shows superiority over conventional joint-based control in heavy-duty forestry machines. Two inverse Jacobian manipulator control schemes, based on velocity and on position servo schemes, are introduced and evaluated under various operating conditions. The results provide guidelines for the design and implementation of manipulator controllers on a forestry machine.
18
Mu, Bin. "System modelling, identification and coordinated control design for an articulated forestry machine." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29618.pdf.
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Brunnerby, Erik. "Android Machine Interface : Integrating anAndroid Mobile Device into an Industrial Control System." Thesis, Linköpings universitet, Programvara och system, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-126952.
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The interaction between humans and industrial machinery have long been dominated by purpose-built hardware made to withstand the tough environment of the factory floor. Advances in hardware and software in the recent decade has made mobile and powerful devices common place, which has prompted this study to evaluate an Android tablet as an interface to control and monitor industrial machinery. This has been done through the implementation of an application used to control a braiding machine. Using this application as a proof of concept and a practical assessment, the study has concluded that an Android device is feasible to use to control and monitor industrial machinery. The study has also evaluated the network performance and security through testing, where it has compared the transport layer protocols TCP and UDP as well as the use of encryption for this implementation.
20
Johnson, Christopher William. "A principled approach to the integration of human factors and systems engineering for interactive control system design." Thesis, University of York, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306489.
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Wu, Jaichun. "The development and implementation of an intelligent, semantic machine control system with specific reference to human-machine interface design." Thesis, Cape Peninsula University of Technology, 2005. http://hdl.handle.net/20.500.11838/2292.
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Thesis (MTech (Information Technology))--Cape Peninsula University of Technology, 2005.<br>This thesis explores the design and implementation of an intelligent semantic machine
control system with specific reference to human-machine interface design. The term
"intelligent" refers to machines that can execute some level of decision taking in
context. The term "semantic" refers to a structured language that allows user and
machine to communicate.
This study will explore all the key concepts about an intelligent semantic machine
control system with human-machine interface. The key concepts to be investigated
will include Artificial Intelligence, Intelligent Control, Semantics, Intelligent Machine
Architecture, Human-Machine Interaction, Information systems and Graphical User
Interface. The primary purpose of this study is to develop a methodology for
designing a machine control system and its related human-machine interface.
22
Liang, Jiangang. "Development of logical models for CNC machine tool motion control system with application to virtual machine tool design /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.
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Wilson, Jarod(Jarod C. ). "Machine learning for nuclear fission systems : preliminary investigation of an autonomous control system for the MGEP." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123363.
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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Thesis: S.B., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 69-70).<br>Commercial nuclear technology today is facing challenges due to both economic viability and concerns over safety. Next-generation reactors could potentially improve with respect to both concerns through recent advancements in computation and machine learning, through autonomous control systems which minimize human error. The MIT Graphite Exponential Pile (MGEP) has been selected as the basis of a realworld demonstration of such a system, because of its simple properties and inherent safety. This study evaluated the preliminary feasibility of an autonomous control system for the MGEP through two parallel avenues; a practical investigation of various machine learning algorithms applied to fission systems, as well as the design and fabrication of a control rod for the pile. It was found that Convolutional Neural Networks (CNNs) outperform Support Vector Regression (SVR) in predicting the MITR power-shape. Additionally, acceptable results were achieved when applying the CNN algorithm to the MGEP to predict the flux distribution of its fuel elements. Finally, it was verified that neutron detectors in the pile respond predictably to control rod insertions. Taken together, the groundwork for the further development of an autonomous control system has been laid, and the path forward is promising.<br>by Jarod Wilson.<br>S.B.<br>S.B. Massachusetts Institute of Technology, Department of Nuclear Science and Engineering
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Tomasevic, Leo. "Non invasive investigation of sensorimotor control for future development of brain-machine-interface (BMI)." Thesis, University of Plymouth, 2014. http://hdl.handle.net/10026.1/3161.
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My thesis focuses on describing novel functional connectivity properties of the sensorimotor system that are of potential interest in the field of brain-machine interface. In particular, I have investigated how the connectivity changes as a consequence of either pathologic conditions or spontaneous fluctuations of the brain's internal state. An ad-hoc electronic device has been developed to implement the appropriate experimental settings. First, the functional communication among sensorimotor primary nodes was investigated in multiple sclerosis patients afflicted by persistent fatigue. I selected this condition, for which there is no effective pharmacological treatment, since existing literature links this type of fatigue to the motor control system. In this study, electroencephalographic (EEG) and electromyographic (EMG) traces were acquired together with the pressure exerted on a bulb during an isometric hand grip. The results showed a higher frequency connection between central and peripheral nervous systems (CMC) and an overcorrection of the exerted movement in fatigued multiple sclerosis patients. In fact, even though any fatigue-dependent brain and muscular oscillatory activity alterations were absent, their connectivity worked at higher frequencies as fatigue increased, explaining 67% of the fatigue scale (MFIS) variance (p=.002). In other terms, the functional communication within the central-peripheral nervous systems, namely involving primary sensorimotor areas, was sensitive to tiny alterations in neural connectivity leading to fatigue, well before the appearance of impairments in single nodes of the network. The second study was about connectivity intended as propagation of information and studied in dependence on spontaneous fluctuations of the sensorimotor system triggered by an external stimulus. Knowledge of the propagation mechanisms and of their changes is essential to extract significant information from single trials. The EEG traces were acquired during transcranial magnetic stimulation (TMS) to yield to a deeper knowledge about the response to an external stimulation while the cortico-spinal system passes through different states. The results showed that spontaneous increases of the excitation of the node originating the transmission within the hand control network gave rise to dynamic recruitment patterns with opposite behaviors, weaker in homotopic and parietal circuits, stronger in frontal ones. As probed by TMS, this behavior indicates that the effective connectivity within bilateral circuits orchestrating hand control are dynamically modulated in time even in resting state. The third investigation assessed the plastic changes in the sensorimotor system after stroke induced by 3 months of robotic rehabilitation in chronic phase. A functional source extraction procedure was applied on the acquired EEG data, enabling the investigation of the functional connectivity between homologous areas in the resting state. The most significant result was that the clinical ameliorations were associated to a ‘normalization’ of the functional connectivity between homologous areas. In fact, the brain connectivity did not necessarily increase or decrease, but it settled within a ‘physiological’ range of connectivity. These studies strengthen our knowledge about the behavioral role of the functional connectivity among neuronal networks’ nodes, which will be essential in future developments of enhanced rehabilitative interventions, including brain-machine interfaces. The presented research also moves the definition of new indices of clinical state evaluation relevant for compensating interventions, a step forward.
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Sanders, Robert W. "System identification and robust control of a high-precision computer numerical controlled machine." Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1603105.
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<p> Modeling a feed axis of a Computer Numerical Controlled (CNC) machine is a challenging problem due to its time-varying dynamics and parametric uncertainties. A simple but practical system identification method was proposed in this thesis and combined with the H∞ technique to design a robust controller for a high-precision CNC milling machine. The ballscrew driven worktable of a Southwestern Industries 2<sup>OP</sup> Mill was modeled by means of a standard frequency response test. The model was linearized around the first axial resonance, and then used to synthesize an H∞ controller based on the linear matrix inequality approach. The simulated closed-loop system was subjected to disturbances and to a reference tool path to test its disturbance rejection and command following capabilities. Another simulated closed-loop system based on the machine’s actual Proportional-Integral-Derivative (PID) controller was created and subjected to the same tests in order to compare the performance of the two controllers. In all simulations, the H∞ controller displayed better performance than the PID controller.</p>
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Rhee, Sokwoo. "Development of a Windows NT real-time operating system for NC machine control." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/45474.
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Ahmed, Adeeb. "Maximum Torque per Ampere (MTPA) Control for Permanent Magnet Synchronous Machine Drive System." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1375726072.
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Yang, Ruochen. "Diagnosis of Evaporative Emissions Control System Using Physics-based and Machine Learning Methods." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587651390226087.
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Podivín, Ladislav. "Design and implementation of control software libraries for fiber characterization." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218304.
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Tato práce se zabývá návrhem a implementací dvou konkrétních softwarových modulů, které jsou částí distribuovaného řídícího systému CoSMic. Tento systém je určen pro řízení speciálního zařízení pro charakterizaci papírových vláken. Prvním vyvinutým modulem je HapticFiber, ten má poskytovat rozhraní mezi řídícím systémem a speciálním vstupním zařízením - haptic device. Druhým modulem je ViCo, jehož účelem je poskytnout softwarovou obálku pro uživatelem definovaný algoritmus zpracovaní obrazu. Tento modul musí být připraven splnit určitá časová omezení, proto je nutné, aby běžel v rámci operačním systému reálného času.
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Josefsson, Alexandra. "Modeling an Embedded Climate System Using Machine Learning." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290676.
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Recent advancements in processing power, storage capabilities, and availability of data, has led to improvements in many applications through the use of machine learning. Using machine learning in control systems was first suggested in the 1990s, but is more recently being implemented. In this thesis, an embedded climate system, which is a type of control system, will be looked at. The ways in which machine learning can be used to replicate portions of the climate system is looked at. Deep Belief Networks are the machine learning models of choice. Firstly, the functionality of a PID controller is replicated using a Deep Belief Network. Then, the functionality of a more complex control path is replicated. The performance of the Deep Belief Networks are evaluated at how they compare to the original control portions, and the performance in hardware. It is found that the Deep Belief Network can quite accurately replicate the behaviour of a PID controller, whilst the performance is worse for the more complex control path. It was seen that the use of delays in input features gave better results than without. A climate system with a Deep Belief Network was also loaded onto hardware. The minimum requirements of memory usage and CPU usage were met. However, the CPU usage was greatly affected, and if this was to be used in practice, work should be done to decrease it.<br>Många applikationer har förbättras genom användningen av maskininlärning. Maskininlärning för reglersystem föreslogs redan på 1990-talet och har nu börjat tillämpas, eftersom processorkraft, lagringsmöjligheter och tillgänglighet till rådata ökat. I detta examensarbete användes ett inbäddat klimatsystem, som är en typ av reglersystem. Maskininlärningsmodellen Deep Belief Network användes för att undersöka hur delar av klimatsystemet skulle kunna återskapas. Först återskapades funktionaliteten hos en PID-regulator och sedan funktionaliteten av en mer komplex del av reglersystemet Prestandan hos nätverken utvärderades i jämförelse med prestandan i de ursprungliga kontrolldelarna och hårdvaran. Det visade sig att Deep Belief Network utmärkt kunde replikera PID-regulatorns beteende, medan prestandan var lägre för den komplexa delen av reglersystemet. Användningen av fördröjningar i indata till nätverken gav bättre resultat än utan. Ett klimatsystem med ett Deep Belief Network laddades också över på hårdvaran. Minimikrav för minnesanvändning och CPU- användning var uppfyllda, men CPU- användningen påverkades kraftigt. Detta gör, att om maskininlärning ska kunna användas i verkligheten, bör CPU-användningen minskas.
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Peng, Jie. "Design and analysis of a CNC system for machining and monitoring." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29730.
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The development of unmanned machining systems has been a recent focus of manufacturing
research. Computer Numerical Control (CNC) units, which monitor and control many tightly coupled machining tasks, are inseparable parts of the unmanned manufacturing
system. This thesis addresses the detailed design and analysis of a modular CNC system for a milling machine. The feed drive control system of the machine tool is thoroughly studied. The mathematical model for the feed drive control system, which consists of a motion controller, power amplifiers and DC-servo motors, is developed and experimentally verified. A method of estimating cutting forces from current drawn by feed drive motors is developed. The viability of the current sensor as a feeding-force sensing component is illustrated and experimentally tested on the milling machine. Successful
application of the current sensor to tool breakage detection in milling operation is presented. The performance of the multi-axis contouring system in precision machining is discussed. The contouring errors induced by feed drive positioning systems in CNC machine tools is investigated using the state space model of the CNC system. The influence
of the cutting force on the accuracy of machining is shown to be negligible for feed drives driven by ball leadscrews. Various control strategies for the improvement of machining accuracy are tested in the simulation studies.<br>Applied Science, Faculty of<br>Mechanical Engineering, Department of<br>Graduate
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Adams, Azeez Olawale. "Control of reconfigurable assembly system." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5368.
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Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: This work considers the control of reconfigurable assembly systems using a welding
assembly system as a case study. The assembly system consists of a pallet magazine, a
feeding system, an inspection and removal system, a welding system and a conveyor. The
aim of the work is to compare PC and PLC as controllers, as well as to compare two
different approaches to reconfigurable control.
The control system of the pallet magazine was developed using a PC and a PLC. The PC
control was programmed using Visual C#, while the PLC was programmed in Ladder Logic
using Siemens S-300 STEP7. The two controllers were compared based on the attributes
that measure the quality of a controller's software, which include its capability,
availability, usability and adaptability.
The approaches to reconfigurable control considered were the agent-based
methodology and the IEC 61499 distributed control methodology, both of which were
applied to the feeding system. The agent-based control system was implemented using
the JADE agent platform, while the IEC 61499 distributed control system was
implemented using the FBDK software kit. These two methods were compared based on
the characteristics of a reconfigurable system, which include the system's modularity,
integrability, convertibility, diagnosability, customization and scalability.
The result obtained in comparing the PC to the PLC shows that the PLC performs better
in terms of capability, availability and usability, while the PC performs better in terms of
adaptability. Also, the result of the comparison between the agent-based control system
and the IEC 61499 distributed control system shows that the agent-based control system
performs better in terms of integrability, diagnosability and scalability, while the IEC
61499 distributed control system performs better in terms of modularity and
customization. They are, however, on a par in terms of convertibility.<br>AFRIKAANSE OPSOMMING: Hierdie werk beskou die beheer van herkonfigureerbare monteringstelsels met 'n
sweismonteringstelsel as gevallestudie. Die monteringstelsel bestaan uit 'n paletmagasyn, 'n
voerstelsel, 'n inspeksie-en- verwyderingstelsel, 'n sweisstelsel en 'n voerband. Die mikpunt
van die werk is om persoonlike rekenaars (PCs) en programmeerbare-logikabeheerders
(PLCs) as beheerders te vergelyk, asook om twee verskillende benaderings tot
herkonfigureerbare beheer te vergelyk.
Die beheerstelsel van die paletmagasyn is ontwikkel met 'n PC en 'n PLC. Die PC-beheer is in
Visual C# geprogrammeer, terwyl die PLC in leerlogika met Siemens S-300 STEP7
geprogrammeer is. Die twee beheerders is vergelyk in terme van die eienskappe wat die
kwaliteit van 'n beheerder se sagteware meet en sluit in vermoë, beskikbaarheid,
bruikbaarheid en aanpasbaarheid.
Die benaderings tot herkonfigureerbare beheer wat oorweeg is, is die agent-gebaseerde
metodologie en die IEC 61499 verspreide-beheermetodologie. Beide is op die voerstelsel
toegepas. Die agent-gebaseerde beheerstelsel is geïmplementeer met behulp van die JADE
agent-platform, terwyl die IEC 61499 verspreide stelsel geïmplementeer is met behulp van
die FBDK sagteware-stel. Hierdie twee metodes se vergelyking is gebaseer op die eienskappe
van 'n herkonfigureerbare stelsel, waarby die stelsel se modulariteit, integreerbaarheid,
diagnoseerbaarheid, pasmaakbaarheid en skaleerbaarheid ingesluit is.
Die resultate wat in die vergelyking tussen die PC en PLC verkry is, toon dat die PLC beter
vaar in terme van vermoë, beskikbaarheid en bruikbaarheid, terwyl die PC beter vaar in
terme van aanpasbaarheid. Die resultaat van die vergelyking tussen die agent-gebaseerde
beheerstelsel en die IEC 61499 verspreide beheerstelsel wys dat die agent-gebaseerde
beheerstelsel beter vaar in terme van integreerbaarheid, diagnoseerbaarheid en
skaleerbaarheid, terwyl die IEC 61499 verspreide beheerstelsel beter vaar in terme van
modulariteit en pasmaakbaarheid. Hulle is egter vergelykbaar in terme van omskepbaarheid.
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Stackhouse, Christian Paul 1960. "AN ADAPTIVE RULE-BASED SYSTEM." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276534.
Full textAbstract:
Adaptive systems are systems whose characteristics evolve over time to improve their performance at a task. A fairly new area of study is that of adaptive rule-based systems. The system studied for this thesis uses meta-knowledge about rules, rulesets, rule performance, and system performance in order to improve its overall performance in a problem domain. An interesting and potentially important phenomenon which emerged is that the performance the system learns while solving a problem appears to be limited by an inherent break-even level of complexity. That is, the cost to the system of acquiring complexity does not exceed its benefit for that problem. If the problem is made more difficult, however, more complexity is required, the benefit of complexity becomes greater than its cost, and the system complexity begins increasing, ultimately to the new break-even point. There is no apparent ultimate limit to the complexity attainable.
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CHUANG, TSUNG-TA, and 莊宗達. "Revamping Torch Cutting Machine Electrical Control System of Continous Casting Machine." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/aw5zf6.
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Silva, Ana Eduarda de Sá. "Collaborative human-machine quality control system: steps towards automatic machine vision inspection." Tese, 2014. https://repositorio-aberto.up.pt/handle/10216/91322.
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Silva, Ana Eduarda de Sá. "Collaborative human-machine quality control system: steps towards automatic machine vision inspection." Doctoral thesis, 2014. https://repositorio-aberto.up.pt/handle/10216/91322.
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Qiu, Zhen-Xuan, and 邱振軒. "The Intelligent Control System for Cloth Spreader Machine." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/a29sfn.
Full textAbstract:
碩士<br>明志科技大學<br>電機工程系碩士班<br>105<br>Recent years have seen growing interest in In INDUSTRY 4.0 technologies and INTERNET of THINGS (IoT). A number of companies in Taiwan are already researching and developing INDUSTRY 4.0 technologies for use. In this thesis, we propose a system that combines Embedded System and Web Server to replace Programmable Logic Controller system in the Cloth Spreader Machine by Embedded System which is widely used in IoT. We also provide statistical analysis of sensor data of and graphical analysis of production so as to make system smart and intelligent.
In this thesis, using webapp as the User Interface and webserver as the cloud platform system. To implementation cloud computing and cloud data storage. Both of System are built in Raspberry Pi 3. The webapp can point out the necessary working information of machine to enable data analysis for manager to promote better productivity. It can bring in its term unlimited economic opportunities.
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Huang, Po-Yuan, and 黃柏源. "System Identification and Control of a Paper Machine." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/23784732543500151524.
Full textAbstract:
碩士<br>國立屏東科技大學<br>機械工程系所<br>95<br>This thesis use system identification control theory get a paper machine industry control to the manufacture process, the purpose is to make standard deviation of dry basis weight of paper make the system tend towards stability in process of production in the rational range, avoid breaking the situation of the paper and taking place.The problem of controlling the mill during normal operation is essentially a regulation problem.To solve the system is unstable to cause to the paper break problem we need accurate systematic mathematics model.Set up the paper machine at first in the thesis to control the datas of the input parameter （thick stock flow）and control the datas which output the parameter（dry basis weight of paper）, use system identification control theory come mathematics model of person who sets up first then. The discussion system identification that controls the application of the method , use the equation error model , prediction error model , output error model etc. to carry out simulation, find out a kind of systematic mathematics model that relatively approaches the real paper mill.The system identifications that the simulation result shows that is for being relatively good up to 75.31% with its similar degree of simulation result of ARX parameter model (three steps ) in the equation error model,the system disperses the degree smaller, and finally cooperate with the design of PID controller , improve the phenomenon of dispersing with unstable system.
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Wu, Kai-Chang, and 吳凱彰. "Using Human Machine Interface of Press Machines for the Monitoring and Control System." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/t5q64e.
Full textAbstract:
碩士<br>國立虎尾科技大學<br>創意工程與精密科技研究所<br>99<br>This thesis aims to design a data acquisition and dynamic monitoring and control system for high speed press machines. A PLC is used to control the actions of the machine and the states are transmitted to the database via the communication interface of the embedded human machine interface system. These data are then output to a terminal PC. We hope that the proposed system can shorten the mean time to repair. At the same time, the supervisor can know the operations of the machine and the situation of the productions. The monitoring and control system shows the failure status on the HMI. Therefore, the operator can easily execute the troubleshooting for the simple extraordinariness. It does not need the professional engineers to do the troubleshooting. Hence the cost and the mean time to repair can be effectively reduced. Furthermore, the system also shows the amount of the machining. When the amount reaching the setting quantity, the machine will stop automatically and send a finishing signal to the HMI. This method let the operators know to prepare the workpieces for the next machining, change the die and molds, or execute the parameter adjustment. By this monitoring approach, operator effort can be reduced. The payload and the cost of machines also can be decreased. Thus, this system improves the market competitiveness of companies.
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HSIEN, KU CHENG, and 古鎮賢. "Remote PLC, servo integration machine control system with HMI." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/96811042158255446419.
Full textAbstract:
碩士<br>明新科技大學<br>電機工程研究所碩士在職專班<br>101<br>For "Remote PLC, servo integration machine control system with HMI " for research, primarily machine and PLC program minimized, by PLC, servo machine KV-5000 Series control with HMI VT3 servo motor the X-Y Table, to achieve in the entire servo control system and through the internet network link can be fault status and control commands transmitted to a remote wireless PC, to conduct remote server monitoring and maintenance.
In digital systems concept, requires KV STUDIO and VT STUDIO programming software to apply in the KV-5000 and VT3-Q5S, implement logic digital operator functions in program development design for hardware planning, analysis of each component with the parameters, each function cutting program, program synthesis and protection mechanisms steps such.
Citation KV-5000 platform oversized, high-speed processing performance and complete peripheral, and do a systematic minimization, experimental results confirm effectively reduce equipment costs and improve equipment performance and multi-functional.
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Tai, Au-Zou, and 戴傲儒. "Study on Intelligent Vending Machine for Visual Control System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/mz5396.
Full textAbstract:
碩士<br>逢甲大學<br>機械與電腦輔助工程學系<br>105<br>In order to improve the lack of systematic management of traditional vending machines, and a lot of idle time and poor sales situation, this paper will try to develop a new type of intelligent vending machine and with real-time face recognition use the facial features the collection of consumer spending Habits, become intelligent self-service store. In order to verify the shortcomings of this new type of vending machine to improve the old machine, the difference between the two will be measured experimentally. The experimental results show that the new type of intelligent vending machine does achieve the purpose of increasing the sales of goods and saving the cost. Can be used as a reference for vending machine design, it is expected that there will be commercialization.
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Adenuga, Olukorede Tijani. "A control system for a reconfigurable bending press machine (RBPM)." 2014. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001518.
Full textAbstract:
M. Tech. Industrial Engineering<br>In industrial manufacturing systems, one often encounters situations in which motion in two, three or more hydraulic cylinders actuators need to be synchronized. The need for the design of a reconfigurable bending press machine (RBPM) control system prompted the research in the development of an automatic and synchronized system, suitable for the press tool operations, versatile in raising and thrusting of multiple- cylinders with odd numbers. The aim of this research is to design and develop a controller that will control all the modules of a reconfigurable bending press machine for bending box-type sheet metal components.
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Thompson, Eric William. "Development of a control system for a walking machine leg." Thesis, 1992. http://hdl.handle.net/1957/37272.
Full textAbstract:
This thesis presents a control system for a walking
machine leg. The leg is representative of one of the six
legs required for a proposed walking machine based on the
geometry of the darkling beetle.
Each of the three joints is controlled by a DC servo
motor mounted to the base of the leg. The speed of the
motors is controlled with pulse width modulation. Feedback
of joint positions is accomplished with potentiometers
mounted on the actual joints.
A five-point path, forming a rectangle in the global
coordinate system, is used as a skeleton of the path of
movement. Desired times and accelerations from point to
point are used to develop the path of movement, which
smoothes corners and velocity transitions along the path.
To create a model of the dynamics of each joint, a
constant motor speed is output and the joint velocity and
joint angle are recorded. From several trials at several
different motor speeds, relationships between the joint
velocity, joint angle, and motor speed can be found. This
data is then least squares fit in two dimensions to give two
second order functions. The first function uses the desired
joint angle to calculate the variance from the mean joint
velocity. This variance is then added to the desired joint
velocity and is used in the second function to calculate the
needed motor signal.
Feedback control is accomplished using a PID control
system. Because of the high level of noise in the feedback
signal, a digital noise filter is used. Both moving average
and linear regression techniques are examined.
Performance of the system is measured by comparing the
actual path in Cartesian coordinates to the desired path of
movement. The RMS error is taken along the path, during the
time frame of the ideal system. The maximum Cartesian error
along the path is also used in evaluation.
To determine suitable feedback gain combinations,
several experiments are run and evaluated. Data is plotted
and suitable values are chosen for the feedback gains based
on their performance and sensitivity to change in
performance.
The performance of the leg is measured for a basic
rectangular path, the basic path with a variation in step
angle, and the basic path with a constant body velocity.<br>Graduation date: 1992
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Gurrala, Gurunath. "Power System Stabilizing Controllers - Multi-Machine Systems." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/1986.
Full textAbstract:
Electrical Power System is one of the most complex real time operating systems. It is probably one of the best examples of a large interconnected nonlinear system of varying nature. The system needs to be operated and controlled with component or system problems, often with combinatorial complexity. In addition, time scales of operation and control can vary from milliseconds to minutes to hours. It is difficult to maintain such a system at constant operating condition due to both small and large disturbances such as sudden change in loads, change in network configuration, fluctuations in turbine output, and various types of faults etc. The system is therefore affected by a variety of instability problems. Among all these instability problems one of the important modes of instability is related to dynamic instability or more precisely the small perturbation oscillatory instability. Oscillations of small magnitude and low frequency (in the range of 0.1Hz to 2.5Hz) could persist for long periods, limiting the power transfer capability of the transmission lines. Power System Stabilizers (PSS) were developed as auxiliary controllers on the excitation system to improve the system damping performance by modulating the generator excitation voltage. However, the synthesis of an effective PSS for all operating conditions still remains a difficult and challenging task.
The design and tuning of PSS for robust operation is a laborious process. The existing PSS design techniques require considerable expertise, the complete system information and extensive eigenvalue calculations which increases the computational burden as the system size increases. Conventional automatic voltage regulator (AVR) and PSS designs are based on linearized models of power systems which fail to stabilize the system over a wide range of operating conditions. In the last decade or so, a variety of nonlinear control techniques have become available. In this thesis, an attempt is made to explore the suitability of some of these design techniques for designing excitation controllers to enhance small perturbation stability of power systems over a wide range of operating and system conditions.
This thesis first proposes a method of designing power system stabilizers based on local measurements alone, in multi-machine systems. Next, a method has been developed to analyze and quantify the small signal performance benefits of replacing the existing AVR+PSS structure with nonlinear voltage regulators. A number of new nonlinear controller designs have been proposed subsequently. These include, (a) a new decentralized nonlinear voltage regulator for multi machine power systems with a single tunable parameter that can achieve effective trade of between both the voltage regulation and small signal objectives, (b) a decentralized Interconnection and Damping Assignment Passivity Based Controller in addition to a proportional controller that can achieve all the requirements of an excitation system and (c) a Nonlinear Quadratic Regulator PSS using Single Network Adaptive Critic architecture in the frame work of approximate dynamic programming. Performance of all the proposed controllers has been analyzed using a number of multi machine test systems over a range of operating conditions.
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ZHANG, QIN-ZHI, and 張欽智. "Study on the control system for multi-media vendor machine." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/41295126627731773538.
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Tsai, Tsung-Ring, and 蔡宗穎. "Machine vision based servo control of a robotic sewing system." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/80740447948879979791.
Full textAbstract:
碩士<br>國立雲林科技大學<br>機械工程系碩士班<br>100<br>This work proposes a machine vision based servo controlled of a robotic sewing system. This robotic sewing system can achieve an automatic sewing process, and reduces the manpower requirement for the traditional industrial sewing machine. The robotic sewing system is equipped with a CCD camera, an X-Y table, and a lighting system. The first step, X-Y table will transfer the material components to the CCD field, and guide the material to the sewing zone with correct image measurement. Then, the stitching edge will be clearly illuminated by the lighting system with different angles, and the Harris corner detection algorithm is implemented to identify the characteristics from the CCD images automatically. Finally, the sewing path is planned according to the characteristics sequence points. The visual servo controlled sewing system can perform the sewing process correctly and compensate the deflection, deformation or dynamic movement of the sewn parts in real time. Experimental results in a variety of sewing materials will test the proposed system is capable of automatic sewing reliably.
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Bing-ShiangHsu and 徐彬翔. "DSP Based Control System for High-Frequency Induction Heating Machine." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/20794900159816585491.
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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>99<br>The application of magnetic materials for hyperthermia of biological tissue has been studied for decades. The underlying notion of magnetic nanoparticle (MNP) thermotherapy is to utilize 10- to 50-nm diameter of ferric oxide (Fe3O4) which are heated up to 42 ℃ under AC magnetic field for cancer therapy applications. The size of nanoparticles and the strength and frequency of magnetic field all have influence to the heating efficiency of MNP. In order to achieve the goal of killing cancer cells using the AC magnetic field, we designed a digital controlled heating system to generate magnetic field that is frequency adjustable. The core of the system is based on a high speed microcontroller（TI TMS320F28235）and a full-bridge series resonant circuit for the high frequency induction heater. The heating results show that the system can produce fast and accurate outputs. The experiments show that the MNP produces thermal loss and has maximum temperature increase up to 13 ℃ under a AC magnetic field. Finally, we discuss the heating effect of different density of magnetic nanoparticles under different operating frequency.
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Yang, Yu-Chien, and 楊佑謙. "Development of a Dedicated Motion Control System for Industrial Machine." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/65478470017356383479.
Full textAbstract:
碩士<br>雲林科技大學<br>機械工程系碩士班<br>96<br>It is becoming common practice to employ servo system in industrial machine control, which aims at increasing the reliability and productivity of products. As for the system cost, current products are not as expensive as those in the past, and they tend to be in the middle-low price bracket. As for functionality, general small and medium-sized axis motion control systems usually adopt PLC+Servo Drive configuration. This not only decreases the cost of developing equipment but also obviously increases the functionality. The proposed dedicated numerical control integrates local servo drive and CNC. Besides the mode of P command position servo-control signal, we also developed the mode of V command velocity servo-control signal, so that the system can run faster.
The purpose of this study is to develop a CAM application software with dedicated graphical and user-friendly interface. This software realizes the function of converting DXF files into NC codes. Besides, the electronic circuit design of pressure and temperature sensor was also completed. Moreover, by integrating digital control system and our software into the same X-Y working panel, users can easily edit, design, and implement NC programs within the machine. This not only maximizes functionality of the machine, but also increases convenience of operation; at the same time, product value is also increased.
After V command velocity servo-controller was developed, the dynamic contour error of controller was explored. It was found that the error resulted from simultaneous motor movement of all axes has interesting behavior. Besides, no matter what contour shape was defined, the controller can effectively suppress the geometric error between the command contour in the system and the practical tracking shapes.
Keyword：contour error , tracking error , PC104 Motion Controller , Digital Servo Drive , System Identification
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Cheng, Sun Jen, and 孫仁政. "A Study of Fuzzy Control System for Plasma Cutting Machine." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/67150856335157432088.
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Ming-HungTsai and 蔡明宏. "Pneumatic Counterweight Strategy and Control System of a Machine Tool." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/74402915796972032934.
Full textAbstract:
博士<br>國立成功大學<br>機械工程學系碩博士班<br>98<br>The pneumatic counterweight system enables machine tools to support the weight of the spindle of the machine tool by using air cylinders. The pneumatic counterweight system is a suitable method of counterweight method because of its high speed and force capacity, combined with its low price and clean operations. The pneumatic pressure compensation method applied for the conventional pneumatic counterweight system is designed to connect a large air tank with a pneumatic cylinder. The air tank is connected to the compressed air source, the compressor, and the pressure regulator or the pressure switch is added to achieve the constant pressure. Therefore the pressure change in the pneumatic cylinder can be reduced due to the spindle motion. However, if the spindle of the machine tool travels at a faster rate, a constant pressure cannot be hold using the conventional method. Therefore this study reformed the pneumatic circuit of the conventional pneumatic counterweight system, the pressure regulator and pressure switch was connected to the cylinder directly. The variation of the pressure in the cylinder can be held by using the new pneumatic circuit. In order to increase the performance of the counterweight system and make the volume of the system smaller, the proportional pressure valve controlled circuit and servo valve controlled circuit are designed and developed as an alternative to the pneumatic counterweight system. The self tuning fuzzy controller was designed and implemented for regulating the pressure in the cylinder using the proportional valve. Through the control method, the fluctuation of the pressure can be decreased efficiently without connecting a large air tank if the machine tool travels at a faster rate. The performance of the proportional valve control system can be decreased at the higher speed and acceleration, so that a modified fuzzy sliding mode controller is developed to increase the stability of the pressure in the cylinder. Besides, the pressure of the cylinder can be also adjusted to eliminate the effect of the friction force by using servo valve controlled system. This control method can be reduced the load during machining and moving. The experimental results show that the proposed pneumatic control circuits and control methods have the ability, in practice, to improve the performance and stability of pneumatic counterweight system.