Dissertations / Theses on the topic 'Data Acquisition Device'
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Byun, Albert Joon-Soo. "Analog signal conditioning design for a wireless data acquisition device." Connect to this title online, 2005. http://hdl.handle.net/1811/368.
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Thesis (Honors)--Ohio State University, 2005.Title from first page of PDF file. Document formattted into pages: contains v, 28 p.; also includes graphics. Includes bibliographical references (p. 21-22). Available online via Ohio State University's Knowledge Bank.
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Davey, Neil P., and n/a. "Acquisition and Analysis of Aquatic Stroke Data From an Accelerometer Based System." Griffith University. School of Microelectronic Engineering, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20061003.153043.
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The aim of this work was to develop devices for elite athletes to record performance related parameters during their training. A device was initially designed and built for rowing to record the motion of the boat. This was to gain understanding of motion signals in a one dimensional plane. The device uses a iPAQ handheld computer for recording and display of data to the user. Using the knowledge obtained from the accelerometer data of the rowing system an initial prototype device was designed and constructed for use in swimming. This device was required to be wearable whilst the swimmer was training, thus it had to record the data onboard. A second version of the swimming device was constructed to improve the usability of the device. The swimming device has fully sealed electronics, wireless charging and infrared communications. The device records three dimensional acceleration patterns at 150Hz, and can store over 6 hours of data using the internal memory. The device can operate for greater than 12 hours before needing to be recharged. The data collected from the swimming device was used to develop processing algorithms to extract when the swimmers push off from the wall, the type of stroke they are swimming, and for freestyle the stroke count. The results of the wall push off algorithm were compared against manual hand timing with 90% algorithm results being with ±1 second of the hand timing data. The stroke type identification algorithm determines which stroke is being swum and presently has an accuracy of 95%. The results of the freestyle stroke count algorithm were compared against manual stroke counts from raw accelerometers data and underwater video. Of the 164 data sets analysed over 90% of the algorithm results were within ±1 strokes of the manual recorded stroke counts.
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Ren, Xiaoran. "A Wearable Fitness Device System for Multiple Biological Information Data Acquisition for Physically Active Persons." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1505209479365329.
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Pellegrino, Gregory S. "Design of a Low-Cost Data Acquisition System for Rotordynamic Data Collection." DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/1978.
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A data acquisition system (DAQ) was designed based on the use of a STM32 microcontroller. Its purpose is to provide a transparent and low-cost alternative to commercially available DAQs, providing educators a means to teach students about the process through which data are collected as well as the uses of collected data. The DAQ was designed to collect data from rotating machinery spinning at a speed up to 10,000 RPM and send this data to a computer through a USB 2.0 full-speed connection. Multitasking code was written for the DAQ to allow for data to be simultaneously collected and transferred over USB. Additionally, a console application was created to control the DAQ and read data, and MATLAB code written to analyze the data. The DAQ was compared against a custom assembled National Instruments CompactDAQ system. Using a Bentley-Nevada RK 4 Rotor Kit, data was simultaneously collected using both DAQs. Analysis of this data shows the capabilities and limitations of the low cost DAQ compared to the custom CompactDAQ.
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Hansen, Sinclair D. "An intrusion detection system for supervisory control and data acquisition systems." Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/16636/1/Sinclair_Hansen_Thesis.pdf.
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Despite increased awareness of threats against Critical Infrastructure (CI), securing of Supervisory Control and Data Acquisition (SCADA) systems remains incomplete. The majority of research focuses on preventative measures such as improving communication protocols and implementing security policies. New attempts are being made to use commercial Intrusion Detection System (IDS) software to protect SCADA systems. These have limited effectiveness because the ability to detect specific threats requires the context of the SCADA system. SCADA context is defined as any information that can be used to characterise the current status and function of the SCADA system. In this thesis the standard IDS model will be used with the varying SCADA data sources to provide SCADA context to a signature and anomaly detection engine. A novel addition to enhance the IDS model will be to use the SCADA data sources to simulate the remote SCADA site. The data resulting from the simulation is used by the IDS to make behavioural comparison between the real and simulated SCADA site. To evaluate the enhanced IDS model the specific context of a water and wastewater system is used to develop a prototype. Using this context it was found that the inflow between sites has similar diurnal characteristic to network traffic. This introduced the idea of using inflow data to detect abnormal behaviour for a remote wastewater site. Several experiments are proposed to validate the prototype using data from a real SCADA site. Initial results show good promise for detecting abnormal behaviour and specific threats against water and wastewater SCADA systems.
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Hansen, Sinclair D. "An intrusion detection system for supervisory control and data acquisition systems." Queensland University of Technology, 2008. http://eprints.qut.edu.au/16636/.
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Despite increased awareness of threats against Critical Infrastructure (CI), securing of Supervisory Control and Data Acquisition (SCADA) systems remains incomplete. The majority of research focuses on preventative measures such as improving communication protocols and implementing security policies. New attempts are being made to use commercial Intrusion Detection System (IDS) software to protect SCADA systems. These have limited effectiveness because the ability to detect specific threats requires the context of the SCADA system. SCADA context is defined as any information that can be used to characterise the current status and function of the SCADA system. In this thesis the standard IDS model will be used with the varying SCADA data sources to provide SCADA context to a signature and anomaly detection engine. A novel addition to enhance the IDS model will be to use the SCADA data sources to simulate the remote SCADA site. The data resulting from the simulation is used by the IDS to make behavioural comparison between the real and simulated SCADA site. To evaluate the enhanced IDS model the specific context of a water and wastewater system is used to develop a prototype. Using this context it was found that the inflow between sites has similar diurnal characteristic to network traffic. This introduced the idea of using inflow data to detect abnormal behaviour for a remote wastewater site. Several experiments are proposed to validate the prototype using data from a real SCADA site. Initial results show good promise for detecting abnormal behaviour and specific threats against water and wastewater SCADA systems.
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Pradhan, Ninad. "Software development for mechatronics systems simulation of multiple UAV navigation and device driver interface for the Q4 data acquisition card /." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1181250594/.
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Cintura, Manuel. "An Embedded Data Logger for In-Vehicle Testing." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23841/.
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This thesis describes an embedded data logger project, composed of software part (in C++ language) and hardware part (Raspberry Pi). It is illustrated the whole procedure from the start of the project with requirements to the end with the experimental results and validation phase. The device is able to acquire, in a synchronous way, videos, CAN and Serial logs from the vehicle under test.
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Marshall, Graham Dean. "Sequential-injection analysis." Thesis, Pretoria : [s.n.], 1994. http://upetd.up.ac.za/thesis/available/etd-03252010-140204/.
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Luiro, V. (Vesa). "Acquisition and analysis of performance data for mobile devices." Doctoral thesis, University of Oulu, 2003. http://urn.fi/urn:isbn:9514271319.
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Abstract
Electronic industry is developing advanced and versatile products to satisfy customers' needs. It is also creating new needs, which expand the market further. This highly competitive field forces companies to produce continuously better, and hence more complex, products at an increasingly fast rate. This is particularly true of the mobile phone industry, which pursues higher volumes and penetration rates throughout the world. Very high volumes and extreme complexity require intensive research and a commitment to high product quality. Mobile phone manufacturers must commit themselves to strict quality standards and programs, which ultimately enable high customer satisfaction.
Both quality assessment and product management generally need a method of feedback to be able to react to the manufactured output. This thesis concentrates on this aspect of feedback. A preliminary customer survey revealed that the information received directly from customers
might not be accurate enough to be used as primary feedback data. The quality of the information varies notably and depends entirely on the customers' ability to perceive the relevant parameters. This also affects greatly their ability to communicate the information to the customer interface and then all the way back to the manufacturer. Based on the findings, end customers' average level of knowledge of mobile phone technology is fair [C]. Therefore, it is recommended that more accurate means should be developed for acquiring feedback data. Also, based on other research findings, it would be important to minimize human intervention and to make the flow of information as direct as possible.
Based on previous research and the present findings, a concept was designed which satisfies the specific need for accurate feedback from the performance of mobile phones in the field. The interfaces providing data throughout the whole product life cycle were also analyzed in detail. And finally, the concept was implemented and piloted with a mobile phone manufacturer. The pilot studies showed that an improved feedback capability would benefit not only product quality, but also various functions of the company producing mobile devices. The increased knowledge of device performance obtained from the system can be utilized in, for example, testing, design, marketing, and management and also at all customer interfaces in the field.
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Mastrippolito, Luigi. "NETWORKED DATA ACQUISITION DEVICES AS APPLIED TO AUTOMOTIVE TESTING." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/606740.
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International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, NevadaThe US Army Aberdeen Test Center (ATC) is acquiring, transferring, and databasing data during all phases of automotive testing using networked data acquisition devices. The devices are small ruggedized computer-based systems programmed with specific data acquisition tasks and then networked together with other devices in order to share information within a test item or vehicle. One of the devices is also networked to a ground-station for monitor, control and data transfer of any of the devices on the net. Application of these devices has varied from single vehicle tests in a single geographical location up to a 100-vehicle nationwide test. Each device has a primary task such as acquiring data from vehicular data busses (MIL-STD-1553, SAE J1708 bus, SAE J1939 bus, RS-422 serial bus, etc.), GPS (time and position), analog sensors and video with audio. Each device has programmable options, maintained in a configuration file, that define the specific recording methods, real-time algorithms to be performed, data rates, and triggering parameters. The programmability of the system and bi-directional communications allow the configuration file to be modified remotely after the system is fielded. The primary data storage media of each device is onboard solid-state flash disk; therefore, a continuous communication link is not critical to data gathering. Data are gathered, quality checked and loaded into a database for analysis. The configuration file, as an integral part of the database, ensures configuration identity and management. A web based graphical user interface provides preprogrammed query options for viewing, summarizing, graphing, and consolidating data. The database can also be queried for more detailed analyses. The architecture for this network approach to field data acquisition was under the Aberdeen Test Center program Versatile Information System Integrated On-Line (VISION). This paper will describe how the merging of data acquisition systems to network communications and information management tools provides a powerful resource for system engineers, analysts, evaluators and acquisition personnel.
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Cevikbas, Orcun. "Data Acquisition And Processing Interface Development For 3d Laser Rangefinder." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607514/index.pdf.
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In this study, it is aimed to improve the previously developed data acquisition program which was run under DOS and 2D surface reconstruction program under Windows. A new system is set up and both data acquisition and processing software are developed to collect and process data within just one application, running under Windows.
The main goal of the thesis is to acquire and process the range data taken from the laser rangefinder in order to construct the 3D image map of simple objects in different positions for indoor environments.
The data acquisition program collects data in helical way. To do this, appropriate parameters for the data acquisition interface are determined. In the data processing step, it is aimed to use basic triangulation algorithms and threshold conditions to calculate resolutions, detect noisy points and segment objects from the environment for line fitting.
The developed and implemented data acquisition and processing interfaces in the thesis are capable of creating 3D image map and obtaining the view of scanned environment in a short time with high accuracy.
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Epps, Brian W. "A comparison of cursor control devices on target acquisition, text editing, and graphics tasks." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/50013.
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The current study compared the performance of six commonly used cursor devices (absolute touchpad, mouse, trackball, relative touchpad, force joystick, and displacement joystick) on three types of tasks (target acquisition, text editing, and graphics). Prior to these comparisons, each of the devices was optimized for display/control dynamics in independent experiments.
A total of 30 subjects were used in the five optimization studies. For each device, the optimization experiment compared a range of control dynamics using a target acquisition task (i.e., positioning a cross-hair cursor over square targets of varying sizes and screen distances). An analysis of variance procedure was used to determine the best control dynamics, of the range studied, for each device. Performance was based on a time-to-target (TT) measure.
A comparison of the six optimized devices was then performed on the three task environments. For the target acquisition, text editing, and graphics tasks, a total of 12, seven, and six subjects were required, respectively. For the target acquisition study, the six devices were compared on a task identical to the optimization task; that is, cursor positioning performance for various target sizes and distances. In addition to the TT dependent measure, bipolar scale and subjective rank data were also collected. The text editing task required subjects to perform document correction on the computer using each of the six devices, with cursor keys added as a baseline device. Task completion time (TCT), bipolar scale response, and subjective rank data were collected. For the graphics task, subjects were required to perform basic graphics editing tasks with the six devices. As with the text editing task, TCT, bipolar scale, and rank data were collected.
Results indicated a wide variation in the cursor positioning performance of the devices on the three tasks. Without exception, the mouse and trackball performed the best of the six devices, across all tasks. In addition, these devices were most preferred. In general, the two joysticks performed worse on the target acquisition and graphics tasks than the two touchpads. On the text editing task, however, the rate—controlled joysticks performed better than the touchpads.Ph. D.
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Balieiro, Ricardo Luis. "Desenvolvimento de uma ferramenta computacional para aquisição via internet de dados de dispositivo de campo em ambiente Fieldbus." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18149/tde-19012011-132802/.
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A crescente utilização de equipamentos inteligentes na área de automação industrial tem assegurado eficiência e qualidade na produção. Em conseqüência deste crescimento, existe uma grande quantidade de equipamentos interligados abrangendo áreas geográficas distantes. Este cenário criou a demanda de sistemas que permitissem o acesso às informações geradas no chão de fábrica a partir de qualquer computador localizado na área industrial ou em qualquer outro ponto do planeta. A Internet propiciou uma nova opção para gerenciamento e monitoramento de equipamentos inteligentes a longa distância. Assim, este trabalho propõe um algoritmo para monitorar, via Internet, os eventos gerados por equipamentos inteligentes instalados em plantas industriais. Com o monitoramento contínuo, é possível analisar o desempenho dos equipamentos, detectar problemas e tomar decisões de forma a garantir que toda uma malha de controle não venha a parar inesperadamente.The increasing usage of smart field devices in the industrial automation area has assured efficiency and quality of production. Thanks to this expansion, a large number of devices can be interconnected through distant geographical areas. This scenario created the need of computational systems that would make the information from the plant floor accessible to any computer in the local industrial area or any other earth wide location. The Internet has created a new possibility of remote managing and monitoring of smart devices. This work proposes an algorithm to monitor, via Internet, the events generated by smart devices installed in industrial plants. The continuous monitoring makes it possible to analyze the performance of the devices, detect problems and make decisions to ensure that an entire control loop does not come to an unexpected halt.
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Cheung, Anthony Hing-lam. "Design and implementation of an Arabic optical character recognition system." Thesis, Queensland University of Technology, 1998. https://eprints.qut.edu.au/36073/1/36073_Cheung_1998.pdf.
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Character recognition is not a difficult task for humans who repeat the process thousands of times every day as they read papers or books. However, after more than 40 years of intensive investigation, there is still no machine that can recognize alphabetic characters as well as humans. Optical Character Recognition (OCR) is the process of converting a raster image representation of a document into a format that a computer can process.
It involves many sub-disciplines of computer science including digital image processing, pattern recognition, natural language processing, artificial intelligence,
and database systems. Applications of OCR systems are broad and
include postal code recognition in postal departments, automatic document entries in companies and government departments, cheque sorting in banks, machine translation, etc. The objective of this thesis is to design an optical character recognition system
which can recognize Arabic script. This system has to be: 1) accurate: with a recognition accuracy of 953; 2) robust: able to recognize two different Arabic fonts; and 3) efficient: it should be a real time system.
This proposed system is composed of five image processing processes: 1) Image Acquisition; 2) Preprocessing; 3) Segmentation; 4) Feature Extraction; and 5) Classification. The recognized results are presented to
users via a window-based user-interface. Thus, they can control the system, recognize and edit documents by a click on the mouse button. A thinning algorithm, a word segmentation algorithm and a recognition based
character segmentation algorithm for Arabic script have been proposed to increase the recognition accuracy of the system. The Arabic word segmentation algorithm successfully segments the horizontally overlapped Arabic words, whereas the recognition-based character segmentation algorithm replaces the classical character segmentation method and raises the level of accuracy of recognition of the proposed system. These blocks have been integrated. Results to test the requirements of accuracy, robustness and efficiency are presented. Finally, some extensions to the system have also been proposed.
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Lin, Chun-Han, and 林君翰. "A general power meter reading data acquisition device using Arduino with OCR functionality." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/83234361416667024853.
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碩士國立中央大學
土木工程學系
104
The purpose of this research is to design an Arduino-based device that can receive a power meter's usage data for further analysis. By using the Arduino Uno Rev3 development board and the JPEG camera, users can add customized features such as the ones for this research and integrate them into a single device. One significant feature of our device is that it can recognize regular text or numbers that are displayed on any power meter because of reusing the OCR (optical character reader) library. Currently, similar devices on the market are more expensive and do not allow users to develop new functions. Hence, if users want to add more functions, they need to pay for the extension components or plugins, which undoubtedly increase the overall cost. Various font types and characters, which were displayed on power meters and captured by the JPEG camera, were used to test the correctness of our device functionality. The results showed that it can continuously send actual meter readings to a computer for further analysis.
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Chou, Ming-Hsiao, and 周明孝. "Design and Application of Real-Time Data Acquisition and Analysis System Using Device Network." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/92577414823826663951.
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碩士國立交通大學
機械工程系
89
The integration of the distributed control system and the network interface is the new trend of the next-generation industrial control system. Due to the compatibility between products developed by different vendors, the products based on open protocols have replaced proprietary design and become very popular in the market. The object of this thesis is to design a distributed real-time data acquisition and analysis system, which is based on CAN protocol and conformed to DeviceNet protocol. The central unit of this system is a PC, whose operating system is Windows NT. Under Windows NT operating environment, the system utilizes a real-time multitasking program and a DeviceNet scanner card to build a real-time data acquisition system based on DeviceNet protocol.
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Pranjoto, Hartono. "Digital/analog data acquisition and signal processing for the Superconductive Quantum Interference Device (SQUID)." 1987. http://catalog.hathitrust.org/api/volumes/oclc/15730050.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 1987.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 5/1-5/3).
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LI, QI-HAN, and 李啟漢. "Studies on developing a single-chip device for environmental data acquisition and control, and its application in horticulture." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/19757712529456708385.
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Hong-LinLin and 林弘霖. "Electrical Characteristics Data Acquisition of Microelectronic Devices and Fiber Optics Alignment System." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3p7bhs.
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Yeh, Kung-Tsan, and 葉公贊. "Comparison of Power Saving Schemes for Wireless Acquisition Data Devices in cdma2000 Systems." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/59067588622001729835.
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碩士國立臺灣科技大學
電子工程系
90
Abstract Next-generation wireless networks are to accommodate more users accessing a wide array of information with portable battery-powered devices. Thus, minimizing the average power consumption at individual node becomes especially important. This thesis considers three uplink channel setup schemes to reduce power consumption of individual node for wireless sensor network applications in cdma2000. The backlog counter threshold scheme transits to active state when the number of packets in transmission queue exceeds the counter threshold value. The vacation timer threshold scheme transits to active state when vacation timer expires. The counter-timer hybrid scheme transits to active state either when the number of packets in queue exceeds the threshold value or when time-out occurs. All the three set-up schemes are under consideration of release scheme used to go back to inactive state when release timer expires. The objective of our study is to evaluate the performances of the three power saving schemes using simple two-state (active state and inactive state) Markov chain model with accurately improved non-exponential distributed transition time in wireless data device for different needs of applications. Under these models, we take insights of threshold selection for reducing power consumption while satisfying the QoS requirements in terms of packet blocking probability and the mean packet delay in system. Furthermore, the performance evaluation of the tradeoffs among channel connection rate, mean packet delay and packet blocking probability, and the tradeoffs between resource (bandwidth) cost and channel connection rate are revealed.
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Liu, Po-Chun, and 劉柏均. "Silicon-based Devices for the Study of Molecular Conductance:Issues on Lithographic Fabrication and Data Acquisition." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/51563912599789953014.
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碩士國立臺灣大學
化學研究所
101
The understanding of the electron-transporting mechanism through the MMM junction (metal-molecule-metal) is important for the improvement of electric properties via molecular design. The I-V curves acquired under low temperature can be transformed into IETS spectra (inelastic tunneling spectroscopy) which are originated from the absorption of electron energy and thus from the excitation of the corresponding vibrational modes. Such an inelastic process is accompanied by an increase of differential conductance (dI/dV) or the appearance of peaks in the derivative of differential conductance (d2I/dV2). The latter offers information equivalent to those of IR or Raman spectra. To prepare devices suitable for the measurements under low temperature, great efforts in photolithography and e-beam lithography have been involved. Lock-in amplification and AC modulation are devised to acquire IETS spectra of our target compounds at 4 K. According to the results of, [Ni3(dpa)4(NCS)2] (dpa‒: dipyridylamido anion), a unique class of molecular wires with features of metal-metal chains distinct from carbon-based p-conjugated molecules, the S/N ratio of differential conductance extracted by lock-in technique is better than the result of numerical derivative from I-V curve. Nevertheless, the resolution of signal still has to be improved in the future, but the comparison with the results extracted by lock-in technique with different frequencies shows the quality of signal at specific frequency is superior to others. Therefore, we rudimentarily predict that the signal at specific frequency originates from the vibrational modes of molecule.
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(11016081), Yang Wang. "DESIGN AND IMPLEMENTATIONS OF OPEN-SOURCE AG IOT DEVICES FOR FARM MACHINERY DATA ACQUISITION AND INTEGRATED ANALYTICS." Thesis, 2021.
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Agricultural machinery is critical in modern farming. With continuous technological advancements in farm machinery, farm machines have evolved from simple mechanical machines to cyberphysical systems that contain rich sources of multimodal sensor data. Effective acquisition and analyses of these data have become essential but challenging tasks in revealing machine-centric and logistical insights to researchers and farmers.
In this dissertation, theses challenge are addressed in two parts. The first part demonstrates successful development and deployment of two open-source telematic devices for collecting machine network, geospatial, and video data. The first, ISOBlue 2.0, was designed to be a logger of both GPS and CAN data with wireless data streaming capabilities. The second, ISOBlue HD, an extension of ISOBlue 2.0, was configured to behave as a network server that interfaced with external cameras for automatic video recording of machine operation contexts. These devices were deployed in a variety of machines in different farming activities. A total of over 1 TB of multimodal machinery data were collected.
The second part presents three problems that focus on analyzing primarily GPS track data collected from past wheat harvests. The first poses an activity classification problem. It involved clustering a 3D feature set generated from both GPS and CAN data from a combine using the Density-Based Spatial Clustering of Applications with Noise algorithm. The
resultant clusters between on-road and in-field data samples as well as normal and anomalous activities. The second problem concentrates on combine unloading event detections using GPS tracks of multiple combines in 16 harvest sessions. The identified events from a novel algorithm that couples Interacting Multiple Models filtering and composite rules were utilized to estimate the total yield for each session. The estimated yields had an overall accuracy of over 90% when comparing to the actual weight ticket records. Lastly, two instantaneous metrics, instantaneous area capacity and swath utilization, were proposed and estimated using GPS tracks of multiple combines in 7 different fields during various harvest years. A novel algorithm was created for estimating instantaneous actual harvested area and swath utilization. This enabled exact computations of instantaneous metrics as oppose to conventional rough estimates of area capacity. Harvest performances were evaluated both temporally and geospatially by machines and years. It was discovered that three contributing factors that lead to high area capacity were wide header attachments, high harvesting speed, and uniform harvesting patterns. Moreover, it was found that the benefit of a wider header might diminish if the harvesting speed was low.
resultant clusters between on-road and in-field data samples as well as normal and anomalous activities. The second problem concentrates on combine unloading event detections using GPS tracks of multiple combines in 16 harvest sessions. The identified events from a novel algorithm that couples Interacting Multiple Models filtering and composite rules were utilized to estimate the total yield for each session. The estimated yields had an overall accuracy of over 90% when comparing to the actual weight ticket records. Lastly, two instantaneous metrics, instantaneous area capacity and swath utilization, were proposed and estimated using GPS tracks of multiple combines in 7 different fields during various harvest years. A novel algorithm was created for estimating instantaneous actual harvested area and swath utilization. This enabled exact computations of instantaneous metrics as oppose to conventional rough estimates of area capacity. Harvest performances were evaluated both temporally and geospatially by machines and years. It was discovered that three contributing factors that lead to high area capacity were wide header attachments, high harvesting speed, and uniform harvesting patterns. Moreover, it was found that the benefit of a wider header might diminish if the harvesting speed was low.
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Njova, Dion. "Evaluating of DNP3 protocol over serial eastern operating unit substations and improving SCADA performance." Diss., 2021. http://hdl.handle.net/10500/27683.
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A thesis which models the DNP3 and IEC 61850 protocol in OPNETSupervisory Control and Data Acquisition (SCADA) is a critical part of monitoring and controlling of the electrical substation. The aim of this dissertation is to investigate the performance of the Distributed Network Protocol Version 3.3 (DNP3) protocol and to compare its performance to that of International Electro-technical Commission (IEC) 61850 protocol in an electrical substation communication network environment. Building an electrical substation control room and installing the network equipment was going to be expensive and take a lot of time. The better option was to build a model of the electrical substation communication network and run simulations. Riverbend modeller academic edition known as Optimized Network Engineering Tool (OPNET) was chosen as a software package to model substation communication network, DNP3 protocol and IEC 61850 Protocol stack. Modelling the IEC 61850 protocol stack on OPNET involved building the used Open System Interconnection (OSI) layers of the IEC 61850 protocol stack onto the application definitions of OPNET. The Transmission Control Protocol/Internet Protocol (TCP/IP) configuration settings of DNP3 protocol were also modelled on the OPNET application definitions. The aim is to compare the two protocols and determine which protocol is the best performing one in terms of throughput, data delay and latency. The substation communication model consists of 10 ethernet nodes which simulate protection Intelligent Electronic Devices (IEDs), 13 ethernet switches, a server which simulates the substation Remote Terminal Unit (RTU) and the DNP3 Protocol over TCP/IP simulated on the model. DNP3 is a protocol that can be used in a power utility computer network to provide communication service for the grid components. DNP3 protocol is currently used at Eskom as the communication protocol because it is widely used by equipment vendors in the energy sector. DNP3 protocol will be modelled before being compared to the new recent robust protocol IEC 61850 in the same model and determine which protocol is the best for Eskom on the network of the power grid. The network load and packet delay parameters were sampled when 10%, 50%, 90% and 100% of devices are online. The IEC 61850 protocol model has three scenarios and they are normal operation of a Substation, maintenance in a Substation and Buszone operation at a Substation. In these scenarios packet end to end delay of Generic Object Oriented Substation Event (GOOSE), vi © University of South Africa 2020 Generic Substation Status Event (GSSE), Sampled Values (SV) and Manufacturing Messaging Specification (MMS) messages are monitored. The throughput from the IED under maintenance and the throughput at the Substation RTU end is monitored in the model. Analysis of the results of the DNP3 protocol simulation showed that with an increase in number of nodes there was an increase in packet delay as well as the network load. The load on the network should be taken into consideration when designing a substation communication network that requires a quick response such as a smart gird. GOOSE, GSSE, SV results on the IEC 61850 model met all the requirements of the IEC 61850 standard and the MMS did not meet all the requirements of the IEC standard. The design of the substation communication network using IEC 61850 will assist when trying to predict the behavior of the network with regards to this specific protocol during maintenance and when there are faults in the communication network or IED’s. After the simulation of the DNP3 protocol and the IEC 61850 the throughput of DNP3 protocol was determined to be in the range (20 – 450) kbps and the throughput of IEC61850 protocol was determined to be in the range (1.6 – 16) Mbps.
College of Engineering, Science and Technology
M. Tech. (Electrical Engineering)