Dynamic And Control Of Air-Bearing Spacecraft Simulator,
2020
Embry-Riddle Aeronautical University
Dynamic And Control Of Air-Bearing Spacecraft Simulator, Jacob Joseph Korczyk
Doctoral Dissertations and Master's Theses
An air bearing is being designed as a spacecraft rotational motion simulator, featuring the Sawyer Robot and its control box. The objective is to maneuver the robot as desired, performing operations specific to on-orbit servicing operations while maintaining stability of the system. Before the control can be designed, the dynamics of the platform and the robot must be modeled. The dynamics of the robot can be derived utilizing a Newton-Euler recursive approach. By beginning with a simple pendulum, then adding links (degrees of freedom) to more closely resemble the Sawyer arm, the equations of motion for the robot can be …
Fatigue Damage Assessment Of Reinforced Concrete Slabs Using Integrated Dynamic Testing And Simulation,
2020
Universiti Malaya
Fatigue Damage Assessment Of Reinforced Concrete Slabs Using Integrated Dynamic Testing And Simulation, Jamadin Adiza
Student Works (2020-2029)
Assessment of existing fatigued structures is an important aspect of civil engineering infrastructure. This is critical in most loaded civil engineering structures such as bridges that are constantly subjected to dynamic loading, causing fatigue in the materials over time. Bridge deck slabs are one of the most structural elements susceptible to different cyclic loads, requiring regular checks for damage to fatigue. In order to understand the deterioration, fatigue carrying capacity and residual strength, the serviceability of the slab under the fatigue loads was not fully explored. Therefore, this research is designed to use vibration-based techniques to investigate the integrity of …
Hybrid Non-Destructive Assessment For Flow Induced Vibration Piping Systems Using Coupled Fluid-Structure Interaction,
2020
Universiti Malaya
Hybrid Non-Destructive Assessment For Flow Induced Vibration Piping Systems Using Coupled Fluid-Structure Interaction, Keen Kuan Kong
Student Works (2020-2029)
Pipelines and piping systems are of great importance in many industries such as water supply, petroleum and petrochemicals and nuclear power generation. They provide transport for high-velocity pressurized fluids operating under time-varying conditions. They are required to operate non-stop for a schedule of 24 hours a day, 7 days a week. Piping vibration failures have been one of the major causes of downtime, fires and explosions in industrial plant over the past 30 years. Failure of piping systems can have disastrous effects, leading to injuries and fatalities as well as to substantial cost to industry and the environment. Flow-induced vibration …
Modeling Nonlinear Heat Transfer For A Pin-On-Disc Sliding System,
2020
Air Force Institute of Technology
Modeling Nonlinear Heat Transfer For A Pin-On-Disc Sliding System, Brian A. Boardman
Theses and Dissertations
The objective of this research is to develop a numerical method to characterize heat transfer and wear rates for samples of Vascomax® 300, or Maraging 300, steel. A pin-on-disc experiment was conducted in which samples were exposed to a high-pressure, high-speed, sliding contact environment. This sliding contact generates frictional heating that influences the temperature distribution and wear characteristics of the test samples. A two-dimensional nonlinear heat transfer equation is discretized and solved via a second-order explicit finite difference scheme to predict the transient temperature distribution of the pin. This schematic is used to predict the removal of material from the …
Focused Beam System Biaxial Material Characterization,
2020
Air Force Institute of Technology
Focused Beam System Biaxial Material Characterization, Nicholas A. O'Gorman
Theses and Dissertations
Electromagnetic material characterization is the process of determining the constitutive parameters (complex permittivity and permeability) of given a sample. Due to the large number of unknowns involved, multiple unique measurements are required for material property extraction. Many measurement methods, such as waveguides and striplines, possess a rigid internal structure that the sample being measured must adhere to. This rigidity limits these methods to samples that fit within the device and inhibits oblique sample orientations, limiting the number of independent measurements that can be obtained. A focus beam system, due to being an open system with greater freedom in sample size …
A Wirelessly Controlled Smart Bandage With 3d-Printed
Miniaturized Needle Arrays,
2020
University of Nebraska - Lincoln
A Wirelessly Controlled Smart Bandage With 3d-Printed Miniaturized Needle Arrays, Hossein Derakhshandeh, Fariba Aghabaglou, Alec Mccarthy, Azadeh Mostafavi, Chris Wiseman, Zack Bonick, Ian Ghanavati, Seth Harris, Craig Kreikemeier-Bower, Seyed Masoud Moosavi Basri, Jordan Rosenbohm, Ruiguo Yang, Pooria Mostafalu, Dennis Orgill, Ali Tamayol
Department of Mechanical and Materials Engineering: Faculty Publications
PUBLIC ACCESS
Results Of Improvement Of The Technological Process Of Sorting Of Draged Seeds,
2020
“Pakhtasanoat Ilmiy Markazi” JSC
Results Of Improvement Of The Technological Process Of Sorting Of Draged Seeds, R.K. Djamolov, E.T. Maksudov, K. Djamolov
Irrigation and Melioration
The article presents the results of experiments conducted to justify the parameters of the seed selection unit to improve the process of sorting seeds. The experiments were carried out by changing the angle of inclination of the seed tray to the horizontal plane from α = 390 to α = 540 and the radius of the lower part of the tray in the aisle R = 140-180 mm. The experimental results show that the bottom of the tray, made in the form of a semicircle, allows the seeds to move up the pipe when the seeds fall from the tray …
A Novel Self-Healing System: Towards A Sustainable Porous Asphalt,
2020
Delft University of Technology
A Novel Self-Healing System: Towards A Sustainable Porous Asphalt, Shi Xu, Xueyan Liu, Amir Tabakovic, Erik Schlangen
Articles
Self-healing asphalt, aimed to produce a sustainable asphalt pavement using green technology, has been studied in the past two decades. Technologies including encapsulated rejuvenator and induction heating have been proposed, demonstrated in the laboratory, and gradually evaluated in field application. This paper looks into the synergy effect of the above two technologies, where induction heating serves as the asphalt damage repair mechanism, requiring just 2 min heating time and encapsulated rejuvenator will replenish (rejuvenate) aged asphalt binder and reinstate bitumen’s healing ability. Moreover, the increased temperature from induction heating could in turn accelerate the diffusion process of rejuvenator into aged …
Energy Saving Issues In Pumping Units,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Energy Saving Issues In Pumping Units, A.I. Anarbaev, D.B. Kodirov, R.A. Zakhidov, B. Usmanov
Irrigation and Melioration
The article presents the issues of energy saving, which are becoming increasingly relevant due to the constant increase in tariffs and the introduction of the demands on energy efficiency and energy conversation. To save energy at pumping units, the characteristics of controlling the electric drive of pumping stations with frequency-controlled control are considered. For adequate adjustment by the technological process of water movement and power supply, corresponding analytical dependencies are obtained. An analysis of the physical expressions of water pumping processes allowed us to determine energy-saving modes of operation and technologies for improving the efficiency of equipment.
Importance Of Creating A System Of Land And Cadastral Data For Subjects Of Agriculture,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Importance Of Creating A System Of Land And Cadastral Data For Subjects Of Agriculture, К. Rakhmonov, M.O. Abdurakhimova
Irrigation and Melioration
A separate model and model were developed for compiling cadastral maps used by the authors for agricultural organizations. The model is intended for enterprises operating in the Tashkent region. The article is based on the scientific and methodological order and the system of destruction of irrigated lands. Based on the experience of leading foreign countries in this area, the possibilities of introducing modern electronic computers in Uzbekistan are presented. The procedure for converting data into a specific algorithm is recommended for the formation of a system of land cadastral data in agricultural entities. It is necessary to create an information …
Apple Orchard Drip Irrigation Conditions Of The Tashkent Region Of Uzbekistan,
2020
TIIAME
Apple Orchard Drip Irrigation Conditions Of The Tashkent Region Of Uzbekistan, Sardor Gulyamov, Bakir Serikbaev, Anvar Sherov
Irrigation and Melioration
The article presents the results of many years of theoretical experimental field research on drip irrigation of the apple orchard of the Golden variety in the conditions of the Tashkent region. Based on the analysis of climatic, soil, hydrogeological, geological, hydrological and economic conditions of the experimental plot, as well as biological features of the garden, the values of total water consumption, water consumption deficit, irrigation, irrigation rate and the number of irrigation by the bioclimatic method are determined.
Calculation Of The Placement Of Vertical Drainage Wells Near An Open Water Source In The Conditions Of Waterlogging Of Built-Up Areas,
2020
The is executed at Research institute of irrigation and water problems
Calculation Of The Placement Of Vertical Drainage Wells Near An Open Water Source In The Conditions Of Waterlogging Of Built-Up Areas, B.K. Saliev
Irrigation and Melioration
The article discusses the methodology for calculating the intercepting drainage well that reveals the upper layer of the multilayer horizon, and presents analytical dependencies based on the hydrodynamic theory and formulas for approximate calculation of the location of the axial line of the blocking drainage between the source of flooding and the protected built-up area from flooding. In particular, mathematical methods have been improved to solve the forecast problems of flooding in conditions of different pressure, based on the relationship between the depressions and the incoming flow of pressure water into the drainage well. The presence of underground pressure water …
Multisector Water Consumption Database: Surkhandarya Region Of The Republic Of Uzbekistan,
2020
Scientific Research Institute of Irrigation
Multisector Water Consumption Database: Surkhandarya Region Of The Republic Of Uzbekistan, М. Ikramova, С. Batishev, О. Ikramov, H. Kabilov, D. Nazaraliev, А. Khodjiev, I. Akhmedkhodjaeva
Irrigation and Melioration
The available water resources in the country are used by the different sectors of economy as industry, agriculture, energy, communal service and etc. In this case the water distribution within the river basin requires perfect information service and data exchange facilities. In the paper the developed unified multi-sector on-line database is presented aimed to monitor the water distribution among sectors of economy, database structure, and data exchange tools. The software works at operative mood, allows evaluating the combined water use efficiency by water users.
Field Research Methods And Some Results For Distribution Of Suspended Sediment In Flow Constrained By Transverse Dams,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Field Research Methods And Some Results For Distribution Of Suspended Sediment In Flow Constrained By Transverse Dams, M.R. Bakiev, K.T. Yakubov, O.M. Matkarimov, Z.B. Dovlatov
Irrigation and Melioration
The article presents methods for determining the main parameters of flow of medium hydraulic size sediment, turbidity, sampling methods in field and the instruments used for sampling, methods of processing the samples in laboratory. Methods for setting sections and gage points and conducting field and laboratory research have been developed for flow deformed by blank and through flow transverse dams, water surface longitudinal and transverse slope takes place in the flow constrained by transverse dams, changes in suspended sediment distribution occur inversely. Location of sections for sampling is determined in the article: in the headrace –beyond dam influence zone, maximal …
Hydromechanical Parameters Of River Sediment,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Hydromechanical Parameters Of River Sediment, A.M. Arifjanov, D.Sh. Allayorov
Irrigation and Melioration
The main problem today in irrigation canals is the danger of siltation, in this process it is important to correctly assess the factors affecting the throughput (hydromechanical parameters of sediment) and using their justification of the hydraulic elements of the flow. The article presents the results of theoretical studies of the main hydromechanical parameters (hydraulic fineness) of river sediments, in hydraulic structures, in particular in irrigation canals, which currently increasingly affect adversely moving water. It has been established that the hydraulic size entering the right bank irrigation sump of the Kokand hydropower complex varies in the range of 189-429 mm/s, …
Minimizing Control Circuits Using Logic Elements,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Minimizing Control Circuits Using Logic Elements, R.T. Gaziyeva, A.M. Nigmatov, E.O. Ozodov
Irrigation and Melioration
In this article considered information about contact and non-contact automation. In most cases, contact automation is used in many pumping stations. These phenomena are a power surge or voltage drop. And also the use of contact automation occupies a large place and inconvenience in operation. Non- contactless automation solves these problems. Pumping stations are usually designed with the calculation of their operation without permanent duty personnel. At large stations, a small staff is provided, which primarily carries out control functions. Set the automatic operation of pumping units. Often, automatic selection of switched-on units is carried out, reserve is withdrawn, station …
Importance Of Creating A System Of Land And Cadastral Data For Subjects Of Agriculture,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Importance Of Creating A System Of Land And Cadastral Data For Subjects Of Agriculture, К. Rakhmonov
Irrigation and Melioration
The generation of electronic data using the land plot scheme while maintaining the land cadastre provides significant convenience for users. Based on this concept, the author explains the conditions, factors and elements of the formation of the contours of land within the land, which plays an important role in the land cadastral work. In particular, the elements of the contour of the earth, that is, the conditions and composition of the border, the area and the order of formation of numbers, are reflected in a separate figure. It is known that the composition of agricultural land plays an important role …
Method Of Determining The Parameters Of The Working Bodies Of The Centrifugal Fan Installed To The Sprayer,
2020
Karshi Engineering and Economics Institute
Method Of Determining The Parameters Of The Working Bodies Of The Centrifugal Fan Installed To The Sprayer, D. Dzhuraev, M.S. Halilov, I.Zh. Toirov, A.E. Urishev
Irrigation and Melioration
The article presents the data of scientists who conducted theoretical and experimental research on centrifugal fans, they refined the calculations, improved technical characteristics and aerodynamic designs of centrifugal fans. Aerodynamic and technological schemes of centrifugal fans installed to the sprayer have been developed. The theoretical and experimental studies conducted by scientists are described: Nevelson MI, Cherkassky VM, Kalinushkin MP, Ivanov O. P., Turbin B. G., on the basis of which the authors developed a method for calculating the main parameters of the working bodies centrifugal fan. Based on the developed calculation methodology, the main parameters of the working bodies of …
Experience Of Creation The Combined Power Complexes On The Basis Of Renewable Energy Sources,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Experience Of Creation The Combined Power Complexes On The Basis Of Renewable Energy Sources, R.A. Zakhidov, A.I. Anarbaev, D.B. Kodirov, F.H. Mukhtarov
Irrigation and Melioration
At the article the combined energy complexes based on renewable energy sources implemented in various countries is analyzed. The regime issues of the most efficient use of maximum generation of electrical energy from solar, wind, biogas sources at reserved diesel station are given. Designs of generator modules based on a kinetic energy buffer storage device for preserving the quality of electricity from renewable energy sources with frequent changes in electrical loads of consumers are considered.
Analysis Of Results Of Researches Of Electrotechnological Treatment Of The Cotton Trouble Up To The First Crop Collection,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Analysis Of Results Of Researches Of Electrotechnological Treatment Of The Cotton Trouble Up To The First Crop Collection, A. Muhammadiev, A.I. Pardaev
Irrigation and Melioration
This article discusses the electrophysical characteristics of plants, more precisely the disclosure of the mechanism of electrical action on the plant through the study of the specific electrical resistance, as well as the task of developing the technological parameters of the electro-technological processing of crops. Knowledge of current value is given, passing through the minted and the rest of the cotton, determination of the negative impact of electrotechnological stamping of cotton on growth and development, yield, by electrotechnological method, including studies of the minted part of cotton, the death of the leaves, the seeds of the pests, the absence of …
