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Articles 361 - 390 of 710

Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

Multilayer Perceptron With Auto Encoder Enabled Deep Learning Model For Recommender Systems, Subhashini Narayan May 2021

Multilayer Perceptron With Auto Encoder Enabled Deep Learning Model For Recommender Systems, Subhashini Narayan

Future Computing and Informatics Journal

In this modern world of ever-increasing one-click purchases, movie bookings, music, health- care, fashion, the need for recommendations have increased the more. Google, Netflix, Spotify, Amazon and other tech giants use recommendations to customize and tailor their search engines to suit the user’s interests. Many of the existing systems are based on older algorithms which although have decent accuracies, require large training and testing datasets and with the emergence of deep learning, the accuracy of algorithms has further improved, and error rates have reduced due to the use of multiple layers. The need for large datasets has declined as well. …

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A Study Of Hygrometer Based On The Method Of Intracavity Laser Absorption, Abdulaziz Muminovich Nazarov Prof, Mirkomil Mirhidoyat Ogli Xasanov May 2021

A Study Of Hygrometer Based On The Method Of Intracavity Laser Absorption, Abdulaziz Muminovich Nazarov Prof, Mirkomil Mirhidoyat Ogli Xasanov

Chemical Technology, Control and Management

The article presents the results of experimental studies of a fiber-optic humidity sensor, the principle of operation of which is based on the method of intracavity laser absorption. A method of intracavity laser absorption is described, which makes it possible to dramatically increase the sensitivity of the fiber humidity sensor by switching to it. A schematic diagram of a fiber optical humidity sensor using a differential detection scheme and a design of an active ring laser fiber consisting of a diode pump laser, a fiber pump beam splitter, two directional couplers, a measuring ring laser, a ring comparison laser, two …

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Application Of The Ultrasonic Generator In The Extractor And Determination Of Its Energy Consumption, Shaxnoza Abduvaxitovna Sultanova, Jasur Esirgapovich Safarov, Azamat Usenov, Doston Ishmuhammat Ogli Samandarov May 2021

Application Of The Ultrasonic Generator In The Extractor And Determination Of Its Energy Consumption, Shaxnoza Abduvaxitovna Sultanova, Jasur Esirgapovich Safarov, Azamat Usenov, Doston Ishmuhammat Ogli Samandarov

Chemical Technology, Control and Management

An ultrasonic generator was used in the Soxhlet extractor. To evaluate the process, the solvent flow was examined. The influence of the flow time in the Soxhlet on the process was analyzed. The formula for the residence time of streaming particles in the apparatus is given. A standardized volume curve V was formed. The time required for the solvent to remain in the apparatus is important during the extraction process. The description of the structure of flows of mass metabolic processes also means that it allows you to determine the movement and distribution of substances in these flows. Therefore, we …

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Main Stages Of Automated System Of Processes For Determining And Ensuring Functional And Parametric Compatibility Of Production And Technological Systems, Sarvar Botir Ugli Nabiyev May 2021

Main Stages Of Automated System Of Processes For Determining And Ensuring Functional And Parametric Compatibility Of Production And Technological Systems, Sarvar Botir Ugli Nabiyev

Chemical Technology, Control and Management

This article presents the main stages of the development of an automated system of processes for determining and ensuring functional and parametric compatibility (FPC) of components of production and technological systems (PTS), in particular production and technological modules (PTM) of machine-building production, respectively, based on the analysis and systematization of technological zones of loading of the main technological equipment (MTE) and the construction of coating surfaces, the main parameters of industrial robots and storage systems (SS), determination and mathematical formalization of coating surfaces and guiding planes of MTE loading zones, formation of types of analytical dependences of FPC PTM functions, …

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Errors Of Universal Contactless Converters Of Monitoring And Control Systems From External Magnetic Fields, A.M Plakhtiev, Gayratjon Gaziev, Yahyojon Meliboyev, Odil Doniyorov May 2021

Errors Of Universal Contactless Converters Of Monitoring And Control Systems From External Magnetic Fields, A.M Plakhtiev, Gayratjon Gaziev, Yahyojon Meliboyev, Odil Doniyorov

Chemical Technology, Control and Management

In communication and communication devices, power equipment, relay protection and automation terminals, in the electric power industry of "smart" cities and homes, in industry, in railway transport, microprocessor-based relay protection and automation devices, distributed generation installations, including renewable energy sources, and electricity storage, as well as "intelligent" automated information and measurement systems are beginning to be used. Contactless converters of direct and alternating currents of control and control systems are widely used in them. Their disadvantages are a narrow range of controlled currents, large dimensions and weight. Therefore, it is important to eliminate them. The paper discusses the general principles …

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Development And Implementation Of Two-Dimensional Fault-Tolerant Programmable Logical Controllers, Azizbek Nodirbekovich Yusupbekov, Nodirjon Turgunboy Ugli Tulaganov, Khurshid Salim Ugli Turaev May 2021

Development And Implementation Of Two-Dimensional Fault-Tolerant Programmable Logical Controllers, Azizbek Nodirbekovich Yusupbekov, Nodirjon Turgunboy Ugli Tulaganov, Khurshid Salim Ugli Turaev

Chemical Technology, Control and Management

It has been revealed that a significant part of industrial control systems designed for technological facilities with more than one input and one output and the most widespread are objects with two inputs and two outputs.The article describes the programming environment for fault-tolerant two-dimensional control systems using PID controller, which software is implemented in an environment for programmable logic controllers (PLC).An experimental testing system has been implemented and software settings and regulator settings have been considered. Real-time PID controllers and filters have been implemented. It has been implemented a variation of the control system software with object imitation.

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Production Of Lime-Ammonium Nitrate Based On Chalk, Nitrate And Ammonium Sulfate, O.X. Rasulov, Abdurasul Mamataliyev, M.X. Dadaxodjaeva, Sh.S. Namazov, B.M. Beglov May 2021

Production Of Lime-Ammonium Nitrate Based On Chalk, Nitrate And Ammonium Sulfate, O.X. Rasulov, Abdurasul Mamataliyev, M.X. Dadaxodjaeva, Sh.S. Namazov, B.M. Beglov

Chemical Technology, Control and Management

The article studies the process of obtaining carbonate-ammonium nitrate (CAN) based on the mixing of melt ammonium nitrate (NH4NO3) with chalk (СаСО3) and ammonium sulfate (NH4)2SO4). For the granulation of nitrate-sulfate-carbonate melt the prilling method is applied using a granulation tower. Determined the composition and properties of new types of fertilizers. It is shown that with the ratio NH4NO3 : СаСО3 : (NH4)2SO4 = 100 : 24 : 1 the product contains 28,03% N, SO3 – 0,50%, 10% …

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Selection Of Mineral Raw Material Fields For Glauconite Sorption Materials, Diyor Xadjibayev, Furkat Ilyasovich Erkabaev May 2021

Selection Of Mineral Raw Material Fields For Glauconite Sorption Materials, Diyor Xadjibayev, Furkat Ilyasovich Erkabaev

Chemical Technology, Control and Management

Natural minerals, such as bentonite, kaolinite, biotite, vermiculite, and glauconite, which have sufficiently high performance properties in the softening of industrial and waste water, softening and cleaning of heavy metals, are promising. To study the physical and chemical properties of glauconites from various deposits of the country, samples of glauconite mineral were brought from the Parkent, Bukhara, and Karakalpak mountain reserves, their physical and chemical properties were studied, compared with each other, and the optimal reserve was selected. The reserves of these deposits are sufficient and have the potential for industrial development. The purpose of this study is to compare …

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Mathematic Simulation Of Glass Melting Process In Glass Production, Shuhrat Manapovich Gulyamov, Azamat Toirovich Rajabov, Utkir Uktam Ugli Kholmanov May 2021

Mathematic Simulation Of Glass Melting Process In Glass Production, Shuhrat Manapovich Gulyamov, Azamat Toirovich Rajabov, Utkir Uktam Ugli Kholmanov

Chemical Technology, Control and Management

A systematic analysis of the technological process of glass melting as an object of automatic control and management has been carried out. As an object of automatic control with distributed parameters, the mathematical description of the glassmaking furnace operation has been developed (considering the main phenomenological features of the technological mode of glassmaking).In this paper, a mathematical description of charge melting process, additional heating by electric current, bubbling, thermal conductivity and heat fluxes during the processing of molten glass have been generated. Initial conditions and simplifying assumptions have been derived. The model is based on the equations of continuity, momentum …

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Algorithms Of System Synthesis For Stabilizing Uncertain Dynamic Objects, Uktam Farkhodovich Mamirov May 2021

Algorithms Of System Synthesis For Stabilizing Uncertain Dynamic Objects, Uktam Farkhodovich Mamirov

Chemical Technology, Control and Management

The article deals with the formation of stable algorithms for the system synthesis for the stabilizing uncertain dynamic objects based on the method of local optimization in the presence of approximate mathematical models. The article analyzes the issues of building adaptive control systems using the concept of roughness, taking into account the assessment of the maximum allowable discrepancy between the object and its model. Some of the most constructive algorithms for determining pseudo-inverse matrices are given. When calculating the pseudo-inverse matrix of the control object, modified QR decomposition algorithms are used, obtained by deleting or assigning a column. The obtained …

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Algorithms For Synthesis Of Discrete Controllers In Nonlinear Control Systems With Delay, Alisher Rajabaliyevich Mallayev, Suban Nurullayevich Xusanov May 2021

Algorithms For Synthesis Of Discrete Controllers In Nonlinear Control Systems With Delay, Alisher Rajabaliyevich Mallayev, Suban Nurullayevich Xusanov

Chemical Technology, Control and Management

Algorithms for the synthesis of discrete controllers in nonlinear control systems, taking into account the delay, have been proposed. The synthesized vector controller provides a solution to the control problem, for example, the translation of the image point of a closed system from arbitrary initial conditions to the origin of the phase space coordinates. Built on the basis of a series-parallel set of invariant manifolds, the dynamic discrete controller ensures the fulfillment of the specified technological requirements, the asymptotic stability of a closed discrete-continuous system, and has the property of predicting the behavior of the system after sampling. These algorithms …

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Principles Of Eliminating The Impact Of Disturbances On Integrated Information And Analytical Systems, Orifjon Olimovich Zaripov, Umidjon Sharabidinovich Hamrakulov, Fatima Faxritdinovna Isxakova May 2021

Principles Of Eliminating The Impact Of Disturbances On Integrated Information And Analytical Systems, Orifjon Olimovich Zaripov, Umidjon Sharabidinovich Hamrakulov, Fatima Faxritdinovna Isxakova

Chemical Technology, Control and Management

Today, production management using integrated information and analytical systems and their integration with the elements of Industry 4.0 is considered one of the most pressing problems in all areas of production. The correct formation of the structure of information systems in their development contributes to the formation of elements of Industry 4.0 and their further full and high-quality integration into other areas. When implementing these processes, one of the most important steps is to reduce the impact of disturbances on integrated information and analytical systems. Taking into account the above, the article considers mathematical models of the principles of eliminating …

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An Examination Of Grid Stability As It Relates To The Increased Integration Of Inverter-Based Resources, Daniel Voss May 2021

An Examination Of Grid Stability As It Relates To The Increased Integration Of Inverter-Based Resources, Daniel Voss

Electrical Engineering Undergraduate Honors Theses

There is currently a growing interest in increasing the amount of renewable energy resources connected to the bulk electric system (BES) that stems from various environmental, political, and social concerns. However, the differences between conventional generation resources and inverter-based resources (IBR)—namely wind and solar—pose new issues that make this increased integration a larger problem. In other studies, the increased penetration of renewable energy resources has resulted in weak-grid systems that are more susceptible to collapse. This comes as a result from the inability for IBRs to effectively provide enough reactive power, an effect especially apparent during fault conditions, which the …

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Specification, Control, And Applications Of Z-Source Circuit Breakers For The Protection Of Dc Power Networks, Sagar Bhatta Apr 2021

Specification, Control, And Applications Of Z-Source Circuit Breakers For The Protection Of Dc Power Networks, Sagar Bhatta

Electrical & Computer Engineering Theses & Dissertations

There is a highly-increasing demand for the DC power transmission and distribution in modern power systems for the integration of newly-installed renewable energy resources and storage systems to the existing utilities. Application of DC power systems in electric ships, battery energy devices, high-voltage DC networks, smart grids, electric vehicles, microgrids, and wind farms is a recent trend that is being highly investigated. The fault protection of DC systems is an essential but challenging issue that needs careful attention to maintain system operation reliability and device safety. In this research, the specification, control, and application of Z-source breakers (ZCBs) are investigated …

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Synthesis Of Control Systems For Multidimensional Dynamic Objects Under Parametric Uncertainty Based On The Invariance Theory, U.F Mamirov Mar 2021

Synthesis Of Control Systems For Multidimensional Dynamic Objects Under Parametric Uncertainty Based On The Invariance Theory, U.F Mamirov

Chemical Technology, Control and Management

The problems of synthesis of control systems for multidimensional dynamic objects in the conditions of parametric uncertainty which are based on invariance theory are considered. When constructing stable synthesis algorithms, a recurrent method for determining pseudo-solutions of linear algebraic systems of equations is used. Computational algorithms for the solution based on singular matrix expansions are given. These computational procedures allow us to regularize the problem of synthesis of the considered algorithms for the synthesis of control systems for multidimensional dynamic objects under conditions of parametric uncertainty and improve the quality indicators of control processes.

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Intellectual Educational Technologies Of Coherent Maintenance Of Digital Transformations, Igor Ivanovich Gancherenok, Ulugbek Mannanov, A.G. Davydovsky, Yu.A. Chernyavsky Mar 2021

Intellectual Educational Technologies Of Coherent Maintenance Of Digital Transformations, Igor Ivanovich Gancherenok, Ulugbek Mannanov, A.G. Davydovsky, Yu.A. Chernyavsky

Chemical Technology, Control and Management

The problems of forming adequate educational technologies and supporting digital transformations for the formation and development of relevant professional competencies as innovative receptivity are interpreted. The fundamental principles of educational technologies that act as a catalyst for educational innovations in the context of digital transformation of economic and social processes are described. The main modern educational platforms of educational support of professional activity are analyzed. The author's interpretation of the synergetic effects in the education system, as well as loans as an educational cryptocurrency is suggested.

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Estimating The Bubbling Process Of Ozone-Containing Gases In The Water, M.P. Parpiev, А.А. Simonov, Aleksey Kamardin, Abdulaziz M. Nazarov Mar 2021

Estimating The Bubbling Process Of Ozone-Containing Gases In The Water, M.P. Parpiev, А.А. Simonov, Aleksey Kamardin, Abdulaziz M. Nazarov

Chemical Technology, Control and Management

Theoretical estimates were made and significant factors of dissolution of ozone-containing gases in water during bubbling in tanks were determined. The expediency of using microbubbles for more efficient saturation of water and aqueous solutions with ozone and generation of ozone with maximum concentration is shown. It is shown that when bubbling gas in water, including ozone-containing gas, the most important indicator is the volume gas content, which determines the ratio of the volume of the gas phase to the volume of the gas-liquid mixture in the contact apparatus. In the presence of a set of bubbles in the water, the …

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Study Of The Rheological Properties Of The Suspension Formed During The Production Of Caustic Soda By The Lime Method, Aktam Ulashovich Erkaev, Dildora Tursunova Mar 2021

Study Of The Rheological Properties Of The Suspension Formed During The Production Of Caustic Soda By The Lime Method, Aktam Ulashovich Erkaev, Dildora Tursunova

Chemical Technology, Control and Management

The process of obtaining sodium hydroxide - caustic soda by conversion of soda ash with lime milk in the presence of natural mirabilite - has been investigated. The influence of temperature, Na2CO3: Na2SO4 ratio, concentration of lime milk and duration of the conversion process on this process was studied by identifying their optimal values. The study of the rheological properties of the reaction pulp showed that it is mobile and well filtered, which makes it possible to obtain rapidly settling large crystals of Na2CO3·2Na2SO4, Na …

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Mathematical Models Of New Magnetoelastic Sensor For Measure Of Power And Vibration Parameters, Javhar Sulton Ugli Fayzullayev Mar 2021

Mathematical Models Of New Magnetoelastic Sensor For Measure Of Power And Vibration Parameters, Javhar Sulton Ugli Fayzullayev

Chemical Technology, Control and Management

In the paper, the mathematical models of the new magnetoelastic sensor for measuring power and vibration parameters are developed taking into account the aggregation or scattering of the parameters of electromagnetic chains and the characteristics of the magnetization curve of the magnetic conductor material. The analysis of the generated mathematical models and graphs based on them showed that the magnetic chain in which the coils are assembled does not take into account the nonlinearity of the magnetization curve of the magnetic conductive material (electrotechnical steel), the result is 12 ÷ 15% of the experimental results. It varies by 6 ÷ …

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To Increasing The Absorption Area Of Column Apparatus With Tubular Lattice Nozzles, Nurmukhamedov Habibulla Sagdullaevich, Batir Babatulaev, Elbek Mavlanov, Samukdjan Nigmadjanov Mar 2021

To Increasing The Absorption Area Of Column Apparatus With Tubular Lattice Nozzles, Nurmukhamedov Habibulla Sagdullaevich, Batir Babatulaev, Elbek Mavlanov, Samukdjan Nigmadjanov

Chemical Technology, Control and Management

The problem of creating a compact refrigeration zone for absorbers with tubular-lattice nozzles made of pipes with spiral turbulators is discussed. Research has been carried out on the influence of the groove depth h/D and α/αгл of the step of their placement t/D on the degree of heat transfer intensification α/αо in the transition region of the gas-liquid flow. An intensification of heat transfer has been achieved only by increasing the groove depth from h/D = 0,003 to 0,095 and the optimal pitch of the grooves, the intensity of heat transfer is 2 or more times. Research has …

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Development Of A New Technology For Obtaining The Substance Of The Drug Acetamizole, Sarvar Saidov, Asqar Abdurazakov, Rixsibay Karimov, Mavluda Baltabayeva Mar 2021

Development Of A New Technology For Obtaining The Substance Of The Drug Acetamizole, Sarvar Saidov, Asqar Abdurazakov, Rixsibay Karimov, Mavluda Baltabayeva

Chemical Technology, Control and Management

The main goal of this work is to obtain a preparation of acetamizole based on local raw materials by a more convenient method of acylation of 2-methoxycarbonylaminobenzimidazole with glacial acetic acid, this synthesis method is proposed for the first time. On the basis of the conducted experiments, favorable conditions for the reaction were found, the influence of the nature of the acid, the temperature, the duration of the reaction and other factors on the course of the reaction was studied, the technology was developed and implemented at the experimental production of "IHRV AN RUz". Based on experiments conducted by scientists …

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Mathematical Model Of A System For Controlling And Diagnosing The Safety State Of Oil And Gas Territory, Erkin Uljaev, Utkirjon Murodillaevich Ubaydullaev, Gayrat Bakhtiyarovich Tadzhitdinov, Sherzod Kholmuminovich Eshkuvatov Mar 2021

Mathematical Model Of A System For Controlling And Diagnosing The Safety State Of Oil And Gas Territory, Erkin Uljaev, Utkirjon Murodillaevich Ubaydullaev, Gayrat Bakhtiyarovich Tadzhitdinov, Sherzod Kholmuminovich Eshkuvatov

Chemical Technology, Control and Management

In this article, the way of creation mathematical model of a control system and diagnostics of the security status of the oil and gas territory is considered. For performing diagnostics of the safety of a status of the oil and gas territory as a mathematical apparatus it is suggested to use a boolean algebra. The main controlled objects and their technological parameters which define safety, integrity of saving, operational carrying out monitoring status as separate objects and all oil and gas territory, prediction of the expected threats, economic social, and economic damage are selected. For the creation of a mathematical …

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Methodology For Determination And Assessment Of Uncertainty Sources Of Textile Materials Total Thermal Resistance, Abdurauf Abdurashidovich Abdukayumov, Ortagoli Sharipovich Hakimov Mar 2021

Methodology For Determination And Assessment Of Uncertainty Sources Of Textile Materials Total Thermal Resistance, Abdurauf Abdurashidovich Abdukayumov, Ortagoli Sharipovich Hakimov

Chemical Technology, Control and Management

The problems of improving of methods for determination of the total thermal resistance of textile materials are considered. A comparative analysis of the applied methods based on stationary and non-stationary heat exchange is performed. A higher accuracy of non-stationary methods based on measuring the cooling time of a heat cell with subsequent determination of the cooling rate and the total thermal resistance of the material under study is noted. A method is proposed for estimating the variance of the main values required for calculating the total thermal resistance of materials. The results of the study of the relationship between sources …

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Analysis Of Consistency Of Similarity Predicates To Measures Of Similarity And Advantages Of Their Application In Digital Systems For Solving Intellectual Problems, Makhmudjon Abdullaev, Nodira Batirdjanovna Alimova Mar 2021

Analysis Of Consistency Of Similarity Predicates To Measures Of Similarity And Advantages Of Their Application In Digital Systems For Solving Intellectual Problems, Makhmudjon Abdullaev, Nodira Batirdjanovna Alimova

Chemical Technology, Control and Management

The results of the analysis of the correspondence of similarity predicates to similarity measures used in various metric methods used for signal classification and the feasibility of using similarity predicates in the construction of digital systems for solving intellectual problems, for which the simplification of computational operations is of no small importance, are presented. Some general and distinctive features of the similarity predicate are considered in comparison with the euclidean metric in relation to one-dimensional and two-dimensional spaces, and generalized to the case of n-dimensional metric spaces. The expediency of using methods based on the calculation of similarity predicates, which …

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Integrated Cyberattack Detection And Handling For Nonlinear Systems With Evolving Process Dynamics Under Lyapunov-Based Economic Model Predictive Control, Keshav Kasturi Rangan, Henrique Oyama, Helen Durand Mar 2021

Integrated Cyberattack Detection And Handling For Nonlinear Systems With Evolving Process Dynamics Under Lyapunov-Based Economic Model Predictive Control, Keshav Kasturi Rangan, Henrique Oyama, Helen Durand

Chemical Engineering and Materials Science Faculty Research Publications

Safety-critical processes are becoming increasingly automated and connected. While automation can increase effciency, it brings new challenges associated with guaranteeing safety in the presence of uncertainty especially in the presence of control system cyberattacks. One of the challenges for developing control strategies with guaranteed safety and cybersecurity properties under suffcient conditions is the development of appropriate detection strategies that work with control laws to prevent undetected attacks that have immediate closed-loop stability consequences. Achieving this, in the presence of uncertainty brought about by plant/model mismatch and process dynamics that can change with time, requires a fundamental understanding of the characteristics …

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Risk Management Decision Making For Security And Trust In Hardware Supply Chains, Zachary A. Collier, Thomas L. Polmateer, James H. Lambert Feb 2021

Risk Management Decision Making For Security And Trust In Hardware Supply Chains, Zachary A. Collier, Thomas L. Polmateer, James H. Lambert

CESUN Conference

Modern cyber-physical systems are enabled by electronic hardware and embedded systems. The security of these sub-components is a concern during the design and operational phases of cyber-physical system life cycles. Compromised electronics can result in mission-critical failures, unauthorized access, and other severe consequences. As systems become more complex and feature greater connectivity, system owners must make decisions regarding how to mitigate risks and ensure resilience and trust. This paper provides an overview of research efforts related to assessing and managing risks, resilience, and trust with an emphasis on electronic hardware and embedded systems. The research takes a decision-oriented perspective, drawing …

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Asset Management Framework For The United States Army Corps Of Engineers Lock And Dam Electrical Equipment, Megan Elizabeth Bates Jan 2021

Asset Management Framework For The United States Army Corps Of Engineers Lock And Dam Electrical Equipment, Megan Elizabeth Bates

Theses, Dissertations and Capstones

The focus of this thesis is to design an efficient and effective preventative maintenance program for the electrical equipment that the United States Army Corps of Engineers (USACE) operates at the locks and dams. This thesis presents the concept of asset management and designs a framework to manage the electrical assets at USACE. The methodology was tested, and the results validated the framework proposed in this thesis. The framework was tested on two separate projects and the results were the same optimized strategies, which shows that the framework is robust and can be implemented into each project and can give …

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In-Situ Process Monitoring For Metal Additive Manufacturing (Am) Through Acoustic Technique, Md Shahjahan Hossain Jan 2021

In-Situ Process Monitoring For Metal Additive Manufacturing (Am) Through Acoustic Technique, Md Shahjahan Hossain

College of Graduate Studies: Theses & Dissertations

Additive Manufacturing (AM) is currently a widely used technology in different industries such as aerospace, medical, and consumer products. Previously it was mainly used for prototyping of the products, but now it is equally valuable for commercial product manufacturing. More profound understanding is still needed to track and identify defects during the AM process to ensure higher quality products with less material waste. Nondestructive testing becomes an essential form of testing for AM parts, where AE is one of the most used methods for in situ process monitoring. The Acoustic Emission (AE) approach has gained a reputation in nondestructive testing …

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Quality Assurance Of Lightweight Structures Via Phase-Based Motion Estimation, Ikenna E. Ifekaonwu Jan 2021

Quality Assurance Of Lightweight Structures Via Phase-Based Motion Estimation, Ikenna E. Ifekaonwu

College of Graduate Studies: Theses & Dissertations

In recent years, lightweight structures have become mature and adopted in various applications. The importance of quality assurance cannot be overemphasized hence extensive research has been conducted to assess the quality of lightweight structures. This study investigates a novel process that exploits motion magnification to investigate the damage characteristics of lightweight mission-critical parts. The goal is to assure the structural integrity of 3D printed structures and composite structures by determining the inherent defects present in the part by exploiting their vibration characteristics. The minuscule vibration of the structure was recorded with the aid of a high-speed digital camera, and the …

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Methods For Weighting Decisions To Assist Modelers And Decision Analysts: A Review Of Ratio Assignment And Approximate Techniques, Barry Ezell, Christopher J. Lynch, Patrick T. Hester Jan 2021

Methods For Weighting Decisions To Assist Modelers And Decision Analysts: A Review Of Ratio Assignment And Approximate Techniques, Barry Ezell, Christopher J. Lynch, Patrick T. Hester

VMASC Publications

Computational models and simulations often involve representations of decision-making processes. Numerous methods exist for representing decision-making at varied resolution levels based on the objectives of the simulation and the desired level of fidelity for validation. Decision making relies on the type of decision and the criteria that is appropriate for making the decision; therefore, decision makers can reach unique decisions that meet their own needs given the same information. Accounting for personalized weighting scales can help to reflect a more realistic state for a modeled system. To this end, this article reviews and summarizes eight multi-criteria decision analysis (MCDA) techniques …

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