Bibliografie tematiche / Rotary shoe

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Letteratura scientifica selezionata sul tema "Rotary shoe"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 1 febbraio 2022

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Articoli di riviste sul tema "Rotary shoe"

1

Huang, Wen Kang, Xing Mei Huang, Hua Yang, Dong Sheng Liang e Ya Jun Zhou. "Innovative Design of a New Household Multi-Functional Shoe Cabinet". Advanced Materials Research 823 (ottobre 2013): 121–26. http://dx.doi.org/10.4028/www.scientific.net/amr.823.121.

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Abstract (sommario):
A new household multi-functional shoe cabinet was designed and prototyped. This shoe cabinet not only maintained the features of multi-function and intelligent control of the traditional one, but also made an innovation in its shortages. Through geometric space analysis and computation, selected rotary shoe rack for shoe storage for its space utilization rate is 1.6 times larger than the traditional one. A fully automatic shoe-cleaning device was designed and prototyped by using profiling mechanism, electronic timers and cam mechanism. Ozone disinfection and PTC dryer were used in shoes maintenance. The results in the performance test demonstrates that this shoe cabinet can accommodated 18 pairs of shoes in common use and clean and maintain shoes of size 34 ~ 45.
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Gui, Wei, Zhi Chu Huang e Hong Chang. "The Design of the Rolling-Shoe Bearing Device Based on Rotary Cylinder". Advanced Materials Research 1037 (ottobre 2014): 95–98. http://dx.doi.org/10.4028/www.scientific.net/amr.1037.95.

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In this paper ,design a kind of rolling-shoe bearing device for supporting rotary cylinder, compare the characteristics of sliding shoe, roller, Rolling-Shoe Bearing, introduce the work principle of r Rolling-Shoe Bearing device, describe the overall structure of Rolling-Shoe Bearing device, the roller arrangement scheme, the design scheme of the raceway cover and structure of the main parts of the device. Research shows Rolling-Shoe Bearing device improves the stability, the reliability of the equipment operation, reduces the cost, and prolongs the service life of equipment.
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3

Lin, Li Zong, Cheng Bing Cao, Hua Tao Cui e Sai Fei Wang. "Measurement Data Restoring Method of Shoe Last Based on Numerical Cutting Technology". Advanced Materials Research 472-475 (febbraio 2012): 1771–76. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.1771.

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From the perspective of Analytic Geometry, the spatial equation of milling cutter rotary surface is obtained. According to the measurement and machining of shoe last, a new measurement data restoring technology that is named Numerical Cutting is presented, and the Numerical Blade is defined. The working principle of Numerical Cutting Technology is introduced in detail, and it is used to restore the measurement data of shoe last. Then the discrete model of shoe last is gotten by shoe last CAD software. Finally, an application example of Numerical Cutting Technology is presented.
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Mitka, Monika, Maciej Gawlik, Mariusz Bigaj e Wojciech Szymanski. "Continuous Rotary Extrusion (CRE) of Flat Sections from 6063 Alloy". Key Engineering Materials 641 (aprile 2015): 183–89. http://dx.doi.org/10.4028/www.scientific.net/kem.641.183.

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The study relates to a process of continuous rotary extrusion (CRE), also known under the name of a Conform Process. This method is used more and more extensively for the plastic working of metals and alloys. In CRE, the feedstock is fed into a profiled groove on the rotating extrusion wheel and is pressed by the pressing wheel. The friction of the extruded material against the rotating wheel generates a force that is pushing the material into the deformation chamber followed by extrusion through the die orifice. The extrusion by CRE was performed on an MC-260 device supplied by Meltech-Confex and installed at IMN - OML for processing of the 6063 aluminium alloy. The feedstock was composed of annealed rods. Two parameters were controlled during extrusion: the temperature of the shoe (element of the housing pressing the extruded material to the wheel) and the speed of the driving wheel. The 6063 alloy was extruded using the wheel speed of 2, 5, 10 and 15 rpm and the shoe temperature of 90°C and 105°C. The extruded flat sections were examined visually for continuity and quality of the resulting surface. In the feedstock rod and in the extruded flat sections (before and after heat treatment), the microstructure and grains were examined by light microscopy. Mechanical properties were also determined (static tensile test and hardness measurement). The study shows how the structure and the mechanical properties of the extruded flat sections are changing depending on the extrusion parameters applied. From the 6063 alloy rods extruded by CRE, flat sections of satisfactory quality were obtained. It was found that CRE yields the highest mechanical properties combined with the correct structure and high surface quality when the feedstock is extruded with the wheel rotational speed of 10 rpm and the shoe temperature of 105°C.
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Chen, Lan, Lu Zhen Chen, Xiao Juan Yang e Ya Ping Yu. "Effects of Feed Shoe Wheel Speed on Tablet Weight Variability". Key Engineering Materials 492 (settembre 2011): 497–500. http://dx.doi.org/10.4028/www.scientific.net/kem.492.497.

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In many manufacturing industries, e.g. powder metallurgy, pharmaceuticals, ceramics and foodstuff, die compaction is widely applied. Although die filling has attracted increasing attention recently, very few published studies are available to predict powder flow rate from a moving feed shoe to dies. In this research, a feed shoe with three wheels of a high-speed rotary tablet press was studied. The powder discharge rates from the feed shoe and the tablet weight variability at different feeding wheel paddle speeds were investigated experimentally and numerically. The results of the two methods were in good agreement. According to the experimental results, the minimum deviation of tablet weight was obtained at the speed of 60 rpm. However, the wheel speed of 55 rpm was likely to be the better one on account of the calculations, which will be studied in the future experiments.
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Lindenberg, Kelly M., e Christopher R. Carcia. "Muscle response times between shoe and no-shoe conditions following a weight-bearing rotary perturbation are similar in females". Journal of Electromyography and Kinesiology 19, n. 5 (ottobre 2009): e329-e333. http://dx.doi.org/10.1016/j.jelekin.2008.06.004.

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Wahyono, Wahyono, Eko Nugroho, Sulis Dri Handono e Eko Budiyanto. "Analisa uji ketahanan fatigue Aluminium scrap hasil remelting sepatu rem (brake shoe) terhadap variasi beban menggunakan tipe rotary bending". ARMATUR : Artikel Teknik Mesin & Manufaktur 1, n. 2 (18 settembre 2020): 96–107. http://dx.doi.org/10.24127/armatur.v1i2.340.

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Used brake shoes are a component of a two-wheeled vehicle that has a type of aluminum material. Therefore, we can do remelting aluminum from brake shoes that can no longer be used for advanced application use and utilization of brake shoe waste which still has a sale value. This study aims to determine the best value or the one that approximates the fatigue limit endurance value of each loading variation given to the specimen and to determine the characteristics of the fracture surface from the differences in given loading. The research method used for fatigue testing is by using a literature study and direct observation or observation. Before doing the fatigue testing, first, do the tensile test to get the yield strength value where this value is used for the loading that will be given to the fatigue test, the loading variations are given for the fatigue test are 40%, 50%, and 60 % of the yield strength value. From the results of fatigue testing at a load of 60% with the stress of 100.2 MPa and a given load of 3.81 kg, it can be seen that the value of material fracture at 27,421 cycles and in the timeframe 00:18:16. Then at 50% loading with the stress of 83.5 MPa and a given load of 3.18 g, it can be seen that the fracture value of the material in the 51,659 cycles in the fracture period is 00:34:35. Then in the next test with a load of 40% and given the stress of 66.8 MPa and a load of 2.5 kg, it is known that the fracture value of the material in the 106,930 cycles in the fracture period reaches 01:11:17. From the test data, it can be concluded that the ratio between cycle and time with voltage is inversely proportional, that is, the smaller the voltage the greater the cycle and time obtained, and vice versa, the greater the voltage, the smaller the cycle and time will be obtained. Keywords: Used brake shoes, Aluminum, Remelting, load variation, fatigue test.
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Vermeulen, G. D., J. J. Klooster, M. C. Sprong e B. R. Verwijs. "Soil Tare and Relative Soil Adherence after uprooting Sugar Beet by a Share Lifter, a Driven Rotary-shoe Lifter and a Grab Lifter". Biosystems Engineering 86, n. 2 (ottobre 2003): 167–78. http://dx.doi.org/10.1016/s1537-5110(03)00117-x.

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Gębura, Andrzej, e Tomasz Radoń. "Failures of avionic generators and contactors operated under harsh ambient conditions". Research Works of Air Force Institute of Technology 30, n. 1 (1 ottobre 2012): 153–76. http://dx.doi.org/10.2478/v10041-012-0010-4.

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The paper outlines failures of selected avionic electric power devices operated onboard of combat helicopters in Iraq and Afghanistan. While the authors were examining the electric power system of aircrafts in order to prolong their operation life they paid attention to numerous symptoms of wear demonstrated by some units of aircrafts. It was peculiar that such symptoms have never appeared during similar examinations of aircrafts operated in our country. By all accounts, the weird wear of components results from high intensity of flights and specific features of operating missions, but harsh climatic conditions seem to be the crucial factor. The authors believe that many of spotted failures experienced by electric power equipment may also happen to aircrafts operated in Poland but obviously, due to much lower intensity of operation and mild impact of environmental factors, such failures shall occur much later. The authors focused their attention on two groups of electric devices and associated destructive factors: 1. Air-cooled electric rotary machines. Fine-grained sand sucked together with air leads to very quick abrasion of protective paint coatings inside the machines. Not frequent but intense rainfalls are the reason for appearance of corrosion pits that lead to such effects as increase of pole shoe volumes. This, in turn, results in shearing of winding insulations with breakdowns (shorts) to ground and, as a final consequence, considerable drop of power demonstrated by an electric machine. 2. Contactors and electromagnets, which are allegedly tight. However, dust penetrates anyway via microfissures and disables operation of moving parts.
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Wibowo, Dwi Basuki, e Ismoyo Haryanto. "KEGAGALAN FUNGSI PENGEREMAN BIS DAN TRUK AKIBAT RUSAKNYA KOMPONEN RAKITAN KAMPAS REM". ROTASI 17, n. 1 (1 gennaio 2015): 19. http://dx.doi.org/10.14710/rotasi.17.1.19-28.

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Federal Motor Vehicle Safety Standard (FMVSS) mengklasifikasikan kendaraan bis dan truk (trailer dan container) sebagai heavy duty vehicle dimana rem, kopling, dan ban adalah komponen-komponen yang harus diperiksa secara rutin karena berkaitan dengan keamanan dan umur pemakaiannya yang relatif pendek. Sebagai komponen utama material gesek kampas rem memang harus bagus dan harus lolos serangkaian test sebagaimana diatur dalam berbagai standard yaitu SNI 09-0143-1987, ASTM G0115-04, ASTM D3359-02. Tetapi menurut The American Public Transportation Association (APTA BTS-SS-RP-003-07), kinerja sistim pengereman bis dan truk tidak semata-mata ditentukan oleh kualitas material kampas rem saja tetapi juga oleh kondisi brake shoe dan prosedur pemasangan (rebuild) kampas pada brake shoe. Dari hasil survey banyak pengusaha transportasi bis di Indonesia yang mengabaikan prosedur rebuild kampas rem yang telah distandarkan oleh APTA BTS-SS-RP-003-07 tersebut. Akibatnya kampas rem cepat aus, rem terkunci, dan yang paling parah adalah rem blong (rem tidak berfungsi). Fokus utama penelitian ini adalah mengkaji kemungkinan kerusakan brake shoe assembly (komponen rakitan kampas rem) saat pengereman yang berpotensi menyebabkan terjadinya kegagalan fungsi pengereman pada bis/truk.
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Più fonti

Tesi sul tema "Rotary shoe"

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Subramanian, Ananthanarayanan K. "Cell Loading and Scheduling in a Shoe Manufacturing Company". Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1108477506.

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Hoher, Junior Alberto. "Design de uma peneira rotativa para colheitadeira de grãos". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2011. http://hdl.handle.net/10183/39034.

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A ênfase deste trabalho está voltada ao desenvolvimento de um novo sistema de limpeza para a colheitadeira de grãos visando, principalmente, a utilização de uma nova geometria. O design de um sistema com peneiras rotativas vem de encontro a todos os sistemas conhecidos até o momento, este sistema visa eliminar sistemas eletrônicos cada vez mais complexos e caros. Uma descrição sobre os sistemas de colheita e máquinas agrícolas, principalmente colheitadeiras, é apresentada neste trabalho, já que a bibliografia sobre este assunto é bastante restrita. A utilização de métodos computacionais, voltados à análise de fluídos foi utilizada com o intuito de nortear o desenvolvimento de protótipos reais. O método computacional dos fluídos dinâmicos simula diversas hipóteses de maneira mais rápida e mais barata até que sejam alcançados resultados suficientemente bons que compensem a fabricação de um protótipo real. Com o protótipo real os resultados virtuais podem ser validados e comparados com outros sistemas. Os resultados obtidos foram bons, a peneira rotativa tem um ótimo desempenho em testes realizados no plano, com perdas inferiores comparativamente às peneiras planas. Nos testes realizados com inclinação o desempenho não foi bom, devido a alguns problemas no duto de ar. Com relação à qualidade dos grãos separados, não foram detectadas quaisquer avarias que pudessem ter sido resultadas da peneira.
The emphasis of this work is dedicated to the development of a new cleaning system for grain harvester aiming mainly to use a new geometry in this part of the machine. The design of a system with rotary sieves comes against all systems known at this time; this system seeks to eliminate electronic systems increasingly complex and expensive. A description of the harvesting systems and agricultural machinery, harvesters mainly, is been presented in this work, since the literature on this subject is very limited. The use of computational methods, focused on the analysis of fluid was used in order to guide the development of prototypes. The method of computational fluid dynamic simulates scenarios faster and cheaper to achieve results that are good enough to compensate the fabrication of a real prototype. With the real prototype, virtual results can be validated and compared with other systems. The results achieved were good. The rotary sieve cleaning system shows excellent performance when testing on level ground with lower losses than a flat sieve system. In tests on slopes, the performance was not as good due to some problems in the air duct. With regard to grain quality, no mechanical damage that could have been produced by the screens was detected in either test.
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Wennberg-Jansson, Jana. "The Rotary Floor Stand : Development of shop fitting for H&M". Thesis, KTH, Maskinkonstruktion (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182830.

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H&M are making their own store interior in-house. They are continuously updating their interior products in order to achieve better quality, design and function in the stores. One of H&M’s key interior products is the Roundrail, which is seen in all H&M stores all around the world. Quality controls showed that current Roundrail could not meet the requirements of quality and function and that an improvement was needed in these areas. A new design was also requested since the current one does not correspond to the desired store expression. The goal of the thesis project was to develop an interior product for H&M that should replace the Roundrail. The overall objective of the development was to secure the quality, improve the features and to create a design that matches desired store expression. This has been conducted by using methods of design and product development. A theoretical study was done within stakeholders and how to involve them in the process, in order to develop a product that fulfills its purpose. This study served as a basis for a comprehensive data collection, which was conducted to find out the stakeholders and their opinion about the current product and requests for the new one. The findings were the foundation for the entire development work. The stakeholders were also involved in the concept generation process, which resulted in a large number of ideas. The concept that was considered to have the greatest potential and credibility was further developed and the product’s design, functions, detailed construction, manufacturing methods and material were defined. The development work focused on creating a durable product that gives a sense of quality and that enables a great presentation of the clothes. The product should also be contemporary, inviting and synchronized with the other interior. This has been achieved by improving selected functions and by creating a new design. This degree project has resulted in complete material for producing a prototype of the Rotary Floor Stand, with two different suggestions of top shapes. H&M had the definitive decision in which of the two tops they will proceed with. A prototype of this product will be produced to be able to evaluate it. The Rotary Floor Stand will possibly be further improved to achieve the final goal: launching the product in H&M’s stores in 2017.
H&M gör sin egen butiksinredning internt. De uppdaterar ständigt sina inredningsprodukter i syfte att uppnå bättre kvalitet, design och funktion i butikerna. En av H&M:s viktigaste inredningsprodukter är Rundringen, som används i alla H&M-butiker världen över. Kvalitetskontroller visade att nuvarande Rundring inte uppfyller kraven för kvalitet och funktionoch att en förbättring i dessa områden behövs. Även en ny design efterfrågades då den nuvarande inte överensstämmer med det önskade butiksuttrycket. Målet med examensarbetet var att utveckla en inredningsprodukt för H&M som ska ersätta Rundringen. Det övergripande målet för utvecklingen var för att säkerställa kvalitén, förbättra funktionerna samt att skapa en design som matchar önskat butiksuttryck. Detta har gjorts med hjälp av metoder för design och produktutveckling. En teoretisk studie gjordes inom berörda parter och hur man involverar dem i processen. Dettaför att utveckla en produkt som uppfyller sitt syfte. Denna studie låg till grund för en omfattande insamling av data, som genomfördes för att definiera de berörda parterna och deras uppfattning om den nuvarande produkten samt önskemål för den nya. Resultatet låg till grunden för hela utvecklingsarbetet. Intressenterna var också inblandade i konceptgenereringsprocessen, vilket resulterade i ett stort antal idéer. Konceptet som ansågs ha störst potential och trovärdighet har vidareutvecklats och produktens design, funktioner, detaljerade konstruktion, tillverkningsmetoder och material definierades. Utvecklingsarbetet fokuserade på att skapa en hållbar produkt som ger den upplevda känslan av kvalité och som möjliggör en bra presentation av kläderna. Produkten ska kännas nutida, inbjudande och vara synkroniserad med övrig inredning. Detta har åstadkommits genom att förbättra de önskade funktionerna samt genom att skapa en ny design. Examensarbetet har resulterat i komplett underlag för att skapa en prototyp av det roterande golvstället, med två olika förslag på toppens form. H&M hade det slutgiltiga beslutet om vilken av produktens två olika toppar som de vill gå vidare med. En prototyp av produkten kommer då att tillverkas för att vidare kunna utvärdera den. Golvstället kommer möjligen förbättras ytterligare för att nå det slutgiltiga målet: att lanseras i H&M:s butiker under 2017.
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Steiner, Vanha Ralph. "Rotary switch and current monitor by hall-based microsystems /". [S.l.] : [s.n.], 1999. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13135.

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Szczygielski, Wojciech Marian. "Dynamisches Verhalten eines schnell drehenden Rotors bei Anstreifvorgängen /". [S.l.] : [s.n.], 1986. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=8094.

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Studer, Martin. "Ablauf schneller Reaktionen in Rotor-Stator-Mischern verschiedener Grösse /". [S.l.] : [s.n.], 1990. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=9037.

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Colombo, Francesco. "Service-like thermo-mechanical fatigue characteristics of 1CrMoV rotor steel /". Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17070.

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Mischo, Bob. "Axial turbine rotor aero-thermal blade tip performance improvement through flow control /". Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17813.

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Behr, Thomas. "Control of rotor tip leakage and secondary flow by casing air injection in unshrouded axial turbines /". Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17283.

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Vorburger, Thomas. "Sodium translocating subcomplexes in bacterial rotary engines : the interface of subunits a and c in the F₁F₀ATP synthase of Ilyobacter tartaricus defined by disulfide cross-linking and characterisation of PomA and PomB, the sodium driven components of the flagellar motor of Vibrio cholerae /". Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17563.

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Libri sul tema "Rotary shoe"

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Pinna, Baingio. On the Pinna Illusion. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780199794607.003.0074.

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The Pinna illusion is the first case of visual illusion showing a rotating motion phenomenon. Squares, arranged in two concentric rings, show a strong counter-rotation effect. The inner ring of the squares appears to rotate counterclockwise and the outer ring clockwise when the observer’s head is slowly moved toward the figure while the gaze is kept fixed in the center of the stimulus pattern. The direction of rotation is reversed when the observer’s head moves away from the stimulus. The speed of the illusory rotation is proportional to the one of the motion imparted by the observer. While the way each individual check receives a local illusory motion signal can be explained by the response of direction-selective neurons at the earliest cortical stage of visual processing, the whole illusory rotational motion can be thought to be sensed by the higher cortical area, which collates all the signals provided by the local motion checks.
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Capitoli di libri sul tema "Rotary shoe"

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Do Luu, Duc, e Luu Minh Hai. "Multi-variable Regressive Models for Diagnostics of the Unbalances on Rapid Rotor in Shop Dynamic Balance". In Proceedings of the 2nd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2020), 267–72. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69610-8_37.

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"rotary shot boring". In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1146. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_183547.

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DeGeare, Joe, David Haughton e Mark McGurk. "Mills and Rotary Shoes". In The Guide to Oilwell Fishing Operations, 84–88. Elsevier, 2003. http://dx.doi.org/10.1016/b978-075067702-8/50013-x.

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Saito, Ken, Minami Kaneko e Fumio Uchikoba. "Ant-Like Walking Behavior of MEMS Microrobot With Artificial Neural Networks IC". In Handbook of Research on Biomimetics and Biomedical Robotics, 228–45. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-2993-4.ch010.

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This chapter explains how the MEMS microrobot system could perform the walking behavior of ants. MEMS microrobot system consists of micro-mechanical systems and micro-electro systems. The micro-mechanical systems mimic the alternating tripod gait of an ant by the shape memory alloy-type rotary actuator and the link mechanism. The micro-electro systems mimic the electrical activity of biological neural networks using the artificial neural networks IC. The artificial neural networks IC generates the driving pulses of shape memory alloy-type rotary actuator without using software programs. The micro-mechanical systems and micro-electro systems are integrated as a robot system. As a result, the authors show that the MEMS microrobot system could perform the ant-like walking behavior with a speed of 20 mm/min. The MEMS microrobot system was 0.079 g in weight, 4 mm width, 4 mm length, and 5 mm height in size. The robot system needs only the electrical power source as an external device.
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Meziane, Salima, Riad Toufouti e Loubna Atarsia. "Non-Linear Adaptive Control of Induction Motor Drive for Standalone Photovoltaic Water Pumping System". In Advances in Systems Analysis, Software Engineering, and High Performance Computing, 450–76. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-5788-4.ch018.

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The integration in the isolated areas and rural sectors is a better solution for producing the electrical energy needed for applications such as pumping systems. The rural water demand for crop irrigation and domestic water supplies is increasing. For this, one of the most conceived solutions is the photovoltaic water pumping technology which has the advantage of being sustainable and respectful of the environment to supply water to rural areas. This chapter describes a robust control of a standalone photovoltaic water pumping system using induction motor drive coupled with a centrifugal hydraulic pump. The induction motor is controlled by algorithm called an adaptive nonlinear control uses a combination of the adaptive observer for rotor flux and nonlinear control technique. The variables to be controlled are the rotor speed and the rotor flux norm required to implement the nonlinear control algorithm is estimated by adaptive flux observer. Simulations are carried out in order to show the effectiveness of the drive and the robustness to parameters variations.
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Thomas, George, Timothy Wilmot, Steve Szatmary, Dan Simon e William Smith. "Evolutionary Optimization of Artificial Neural Networks for Prosthetic Knee Control". In Efficiency and Scalability Methods for Computational Intellect, 142–61. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-3942-3.ch007.

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This chapter discusses closed-loop control development and simulation results for a semi-active above-knee prosthesis. This closed-loop control is a delta control that is added to previously developed open-loop control. The control signal consists of two hydraulic valve settings. These valves control a rotary actuator that provides torque to the prosthetic knee. Closed-loop control using artificial neural networks (ANNs) are developed, which is an intelligent control method. The ANNs are trained with biogeography-based optimization (BBO), which is a recently developed evolutionary algorithm. This research contributes to the field of evolutionary algorithms by demonstrating that BBO is successful at finding optimal solutions to real-world, nonlinear, time varying control problems. The research contributes to the field of prosthetics by showing that it is possible to find effective closed-loop control signals for a newly proposed semi-active hydraulic knee prosthesis. The research also contributes to the field of ANNs; it shows that they are able to mitigate some of the effects of noise and disturbances that will be common in normal operation of a prosthesis and that they can provide better robustness and safer operation with less risk of stumbles and falls. It is demonstrated that ANNs are able to improve average performance over open-loop control by up to 8% and that they show the greatest improvement in performance when there is high risk of stumbles.
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7

K. Zezatti Flores, Mayra, Laura Castro Gómez e Gustavo Urquiza. "Fluid Structure Interaction Analysis of Wind Turbine Rotor Blades Considering Different Temperatures and Rotation Velocities". In Computational Overview of Fluid Structure Interaction. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96495.

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Wind energy is the clean energy source that has had the highest installation growth worldwide. This energy uses the kinetic energy in the airflow currents to transform it into electrical energy through wind turbines. In this chapter, a rotor of a 2 MW of power wind turbine installed in Mexico is analyzed considering the wind velocity data and temperatures at each season of the year on the zone for the analysis in Computational Fluid Dynamics (CFD); subsequently, a Fluid–Structure Interaction (FSI) analysis was carried out to know the stress of the blades. The results show a relationship between temperature, air density, and power.
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8

"Indirect Power Control (IDPC) of DFIG Using Classical & Adaptive Controllers Under MPPT Strategy". In Improved Indirect Power Control (IDPC) of Wind Energy Conversion Systems (WECS), a cura di Fayssal Amrane e Azeddine Chaiba, 26–85. BENTHAM SCIENCE PUBLISHERS, 2019. http://dx.doi.org/10.2174/9789811412677119010005.

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In this chapter, we present a comparative study of conventional Indirect Power Control (IDPC) algorithm of DFIG-Wind turbine in grid-connection mode, using PI and PID controllers via Maximum power point tracking (MPPT) strategy. Firstly, the conventional IDPC based on PI controllers will be described using simplified model of DFIG through stator flux orientation and wind-turbine model. The MPPT strategy is developed using Matlab/Simulink® with two wind speed profiles in order to ensure the robustness of wind-system by maintaining the Power coefficient (Cp) at maximum value and reactive power at zero level; regardless unexpectedF wind speed variation. Secondly, the rotor side converter (RSC) and Grid side converter (GSC) are illustrated and developed using Space vector modulation (SVM) in order to minimize the stress and the harmonics and to have a fixed switching frequency. In this context, the switching frequency generated by IDPC to control the six IGBTs of the inverter (RSC), and this control algorithm works under both Sub- and Supersynchronous operation modes and depending to the wind speed profiles. The quadrants operation modes of the DFIG are described in details using real DFIG to show the power flow under both modes (motor and generator in the four (04) quadrants. Finally, the conventional IDPC have several drawbacks as: response time, power error and overshoot. In this context, the PID and MRAC (adaptive regulator) controllers are proposed instead of the PI to improve the wind-system performances via MPPT strategy with/without robustness tests. The obtained simulation results under Matlab/Simulink® show high performances (in terms of power error, power tracking and response time) in steady and transient states despite sudden wind speed variation, whereas big power error and remarkable overshoot are noted using robustness tests, so the proposed IDPC can not offer big improvement under parameter variation.
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Bouchiba, Nouha, Souhir Sallem, Mohamed Ben Ali Kammoun, Larbi Chrifi-Alaoui e Saïd Drid. "Nonlinear Control Strategies of an Autonomous Double Fed Induction Generator Based Wind Energy Conversion Systems". In Entropy and Exergy in Renewable Energy [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.94757.

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In the last few decades, among the wide range of renewable energy sources, wind energy is widely used. Variable speed wind energy conversion systems based on double fed induction generator have a considerable interest mostly in case of islanded networks and/or isolated applications. In this paper, as a means to supply remote areas, an investigation of a wind energy conversion system (WECS) based on a double fed induction generator (DFIG) is carried out. The presence of both wind turbine aerodynamics and DFIG coupled dynamics causes strong nonlinearities in the studied system. Wind speed and demanded power variations have a major impact on the quality of the produced energy. In order to control and maintain the stator output voltage and frequency at their nominal values (220 V/50 Hz) under wind speed and load variations, this work presents a study of three kinds of controllers: PI, Back-Stepping and Sliding Mode controllers. These controllers are integrated in the studied system and a comparison of their dynamic performances has been developed. Moreover, in order to ensure the rotor side converter safety on the one hand and to guarantee an optimal operation of the DFIG on the other hand, a management strategy is proposed in this work. Simulation results are performed using Matlab/Simulink environment and show the effectiveness and the accuracy of each controller compared to others mainly with the presence of wind speed and load demand variations.
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Dondero, Franco, Loredana Gandini, Francesco Lombardo e Andrea Lenzi. "Immunological infertility". In Oxford Textbook of Endocrinology and Diabetes, 1429–32. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780199235292.003.9100.

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Immunological infertility is the presence, in one or both partners, of an antisperm immune reaction capable of interfering with fertility variables. In about 8–10% of these couples the immunological phenomenon is on the male side, causing ‘male immunological infertility’ (1). Since the first demonstration that a significant number of infertile men show an autoimmunity to sperm, experiments have suggested that antisperm antibodies (ASA) can interfere with the fertilizing ability of spermatozoa (2). ASA can act negatively on the motility of spermatozoa in semen, on their ability to pass through female genital secretions, or on the penetration of the oocyte. In particular, owing to in vitro fertilization techniques, it has been possible to demonstrate the effects of antibody-bound sperm directly, at the level of in vitro gamete interaction (3). ASA can reduce the motility and concentration of spermatozoa, and can induce sperm agglutination. However, normozoospermia can be accompanied by a high percentage of antibodies bound to the sperm surface, or a high ASA titre in serum or seminal plasma. In addition, ASA can affect sperm penetration of cervical mucus. When ASA are present in cervical mucus or bound to the sperm surface, impaired sperm penetration of cervical mucus, and abnormal swimming behaviour within cervical mucus—ranging from complete immobilization of sperm, to vibratory motion with limited progression (‘shaking reaction’), to restricted tail beat frequency and loss of rotatory motion—may be observed during the post-coital test (PCT). The shaking reaction in these cases is presumably due to cross-linking of motile, antibody-coated spermatozoa to the cervical mucus gel via the Fc part of the antibody (4). ASA may also inhibit fertilization by binding specifically to membrane antigens involved in sperm–oocyte interaction. They can additionally impair the fertilization process at the levels of the acrosome reaction, of zona pellucida recognition and penetration, and of sperm–vitellus interaction (5).
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Atti di convegni sul tema "Rotary shoe"

1

Heisig, Gerald, James Albert Hood, Olusola Okewunmi e Edward W. Robnett. "Achieving Shoe to Shoe Drilling Performance in Hole Opening Applications with Rotary Steerable Systems". In SPE/IADC Drilling Conference. Society of Petroleum Engineers, 2007. http://dx.doi.org/10.2118/105578-ms.

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Rogers, Henry Eugene, Earl Don Webb, Jim D. Tilley e Brett Fears. "Costly Shoe-Track Drilling Practices Using Conventional and Rotary-Steerable Systems Evaluated: A Summary of Lessons Learned, Proposed Best Practices, and Software-Driven Recommendations". In Middle East Drilling Technology Conference & Exhibition. Society of Petroleum Engineers, 2009. http://dx.doi.org/10.2118/124368-ms.

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3

Rogers, Henry, Earl Webb e Brett Fears. "Costly Shoe-Track Drilling Practices Using Conventional-and Rotary-Steerable Systems Evaluated: A Summary of Lessons Learned, Proposed Best Practices and Software-Driven Recommendations". In SPE Asia Pacific Oil and Gas Conference and Exhibition. Society of Petroleum Engineers, 2008. http://dx.doi.org/10.2118/116184-ms.

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4

Grade, John D., Kevin Y. Yasumura e Hal Jerman. "Mechanical Brakes for Electrostatic Actuators". In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60788.

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New DRIE actuator systems have been developed which use a high-force, linear actuator to wrap a flexible brake band around the rigid brake shoe of a large-deflection, rotary actuator. The brake can hold the rotary actuator at any arbitrary location within its full range of travel. A third actuator may be used to engage a pair of locking pins in order to keep the brake motor extended in the event of a power failure. The 100x increase in rotational stiffness after the brake is applied raises the fundamental resonant frequency by more than an order of magnitude, enabling precision optical adjustments over a large tuning range in the presence of external shock and vibration. Consistent braking accuracies of 1 mdeg, or 0.025% of the full-scale deflection, have been demonstrated across the entire rotational range
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5

Frederic Antoine Champain, Louis, Syed Zahoor Ullah e Alexey Ruzhnikov. "Successful CWD Campaign in Turnkey Project with Potential Utilisation for Well Construction Optimisation". In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21355-ms.

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Abstract Drilling and completion of the surface and intermediate sections in some fields is extremely challenging due to wellbore instability, especially accomplished with complete losses. Such circumstances lead to several time-consuming stuck pipe events, when existing standard ways of drilling did not lead to a permanent resolution of the problems. After exhausting the available conventional techniques without sustainable success, unorthodox solutions were required to justify the well delivery time and cost. Here comes the Casing While Drilling (CwD), being the most time and cost-effective solution to wellbore instability. CwD is introduced at full throttle aiming at the well cost reduction and well quality improvement. The implementation plan was divided in three phases. The first phase was a remedial solution to surface and intermediate sections drilling and casing off to prevent stuck pipe events and provide smooth well delivery performances. After successful implementation of CwD first phase, CwD was taken to the next level by shifting it from a mitigation to an optimization measure. Each step of CwD shoe-to-shoe operations was analysed to improve its performances: drill-out (D/O) of 18⅝-in shoe track with CwD, optimum drilling parameters per formation and CwD bit design. Implemented in 19 wells, CwD shoe-to-shoe performances have been brought up or even above standard rotary bottom hole assembly (BHA) benchmark. Planning for third phase is undergoing whereby CwD is aiming to optimize a well construction to reduce well delivery time, by combining surface and intermediate sections thus eliminating one casing string. Numerous challenges are being worked on including open hole (OH) isolation packer which conform to and seal with the borehole uneven surface. Special "for purpose built" expandable steel packer and stage tool have been manufactured and qualified for the specific application. A candidate well has been chosen and agreed for first trial. The key areas of improvement include, drilling and casing off the surface and intermediate sections while competing with standard rotary BHA performances and slimming down the well profile towards tremendous time and costs savings. This paper encompasses details of constructions of various wells with sufficient contingencies to combat any expected hole problems without compromising the well quality while keeping the well within budget and planned time. It also provides an analysis of the well trials that were executed during the implementation of first and second phases of CwD implementation and the captured lessons learnt which are being carried forward to the next phase. This paper provides the technique on how CwD can be used to help with three aspects of drilling, successfully mitigating holes problems by reducing OH exposure time and to eliminate drill string tripping and modifying conventional casing design to reduce well time and cost by eliminating one casing string.
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Hussain, Sajjad, Mohamed Saher Dahroug, Belinda Mikalsen, Karianne Holen Christensen, Daniel Ndubuisi Nketah, Leida Monterrosa, Mark Van Aerssen et al. "Enabling Technologies Help Drilling an Extreme ERD Well on Brage Field, North Sea". In SPE/IADC International Drilling Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/204134-ms.

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Abstract Drilling a nine km (Kilometers) extreme ERD (Extended Reach Drilling) well by a rig which was initially designed for six km and on a platform that did not provide any empty well slot posed a challenge to the Brage asset team. The well (A-36 A/B) was planned with an ambitious slot recovery operation removing all casing strings to surface to allow for a 24-inch sidetrack. Due to unexpected challenges during the slot recovery only a 19-m window between the 28-in conductor shoe (at 315-m MD) and the old 13 3/8-in casing stump was available. A very successful kick-off using a mud motor and Gyro-While-Drilling bottomhole assembly (BHA) was performed. An RSS (Rotary Steerable System) BHA was used to drill the rest of the section Both "push the bit" and "point the bit" RSS technologies were the key enablers in drilling long sections and helping to deploy casing strings. The well was successfully geosteered through two reservoirs, including a new reservoir landing strategy, adding valuable extra reservoir meters. The reservoir Mapping-While-Drilling and Magnetic Resonance-While-Drilling service helped to navigate in challenging reservoirs maximizing reservoir exposure. Advanced polyglycol Water-Based Mud system was utilized in 24-in section followed by advanced Oil-Based Mud (OBM), and Low Solids OBM systems enabled drilling this extreme ERD well. An upgraded Cuttings collection and transportation system meeting ERD requirements and offshore slop water treatment system also played key role in drilling optimization. Real-time monitoring of critical well construction operations was performed using specialized technologies. Optimized Viscous Reactive Pill (VRP) was successfully used for the first time in North Sea to provide cement plug base at deeper depths (7200-m MD) resulting in a successful kick-off using "point the bit" RSS systems. An ERD specialist subsidiary of the service company was involved in ERD design verification and training of offshore personnel. Outstanding equipment reliability of surface equipment and downhole tools enabled shoe-to shoe drilling of these sections. The OneTeam culture combined with the main service provider integrated solutions, and an open-minded and brave approach led to drilling longest well in this brownfield ever. It was completed 32-days ahead of plan with all objectives met. The deep lower screen completion was successfully deployed, and the well is producing as expected. This 9,023-m MD well is the longest Offshore well drilled by the Operator and 2nd longest drilled by the Operator ever.
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7

Salman, Moh'd, e H. El Raggal. "Rotary Drilling US-Khuff Formation with PDC Bits". In Middle East Oil Show and Conference. Society of Petroleum Engineers, 1999. http://dx.doi.org/10.2118/53341-ms.

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Alqassab, M. H., e M. Fathalla. "Drilling Performance in Turbodrilled and Rotary-Drilled Khuff and Pre-Khuff Wells in Bahrain Field". In Middle East Oil Show. Society of Petroleum Engineers, 1987. http://dx.doi.org/10.2118/15693-ms.

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Durfee, William, Saeed Hashemi e Andrew Ries. "Hydraulic Ankle Foot Orthosis Emulator for Children With Cerebral Palsy". In BATH/ASME 2020 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fpmc2020-2791.

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Abstract Objective: Ankle foot orthoses (AFOs) are used by nearly 50% of children with cerebral palsy (CP) to ameliorate gait impairments. The methods used to prescribe and tune the mechanical properties of an AFO, including its angular stiffness about the ankle, are based on the intuition and experience of the practitioner. The long-term goal of this research is to develop and deploy a technology-based solution to prescribing passive AFOs that uses an AFO emulator to be used in the clinic that can, under computer control, vary its stiffness in real-time to determine the best stiffness for walking. The objective of this project was to design and bench-test a first-generation wearable hydraulic ankle exoskeleton, and to conduct a small clinical trial to determine whether walking in a conventional plastic AFO was the same as walking in the hydraulic exoskeleton whose stiffness was programmed to match that of the conventional AFO. Methods: The hydraulic ankle exoskeleton was comprised of a wearable ankle exoskeleton tethered by small-diameter hydraulic hose to a push-behind cart that contained the hydraulic power supply and control components. The ankle component contained a novel double-ended cylinder with a cable anchored to the piston. The system was controlled to emulate a rotary spring. Bench top tests were performed to validate the performance of the system. In addition, an early feasibility clinical trial was conducted with five children with cerebral palsy who walked in three conventional AFOs (flexible, medium and stiff) and the hydraulic AFO controlled to match each stiffness. Kinematics and dynamics of gait were measured with a 12-camera motion capture system and a force plate. Results: The weight of the wearable exoskeleton plus shoe was 1.5 kg, 60% over the design goal. The system, running at a rail pressure of 141 bar (2,050 psi), could produce 62 Nm of torque and could emulate springs from 1 to 4.6 Nm/deg, the stiffness range of most conventional AFOs. Once calibrated, the torque-displacement properties were similar to the matched conventional AFO. Walking metrics were the same for hydraulic and conventional AFOs. Interpretation: Small-scale hydraulics are effective for a wearable exoskeleton that is designed to mimic a passive AFO and hydraulics can be used to emulate a rotary stiffness. While heavier than the design target, the added weight of the hydraulic system did not seem to impact walking in a significant way. The metrics used to evaluate walking were not sensitive enough to detect any subtle differences between walking with the hydraulic system and walking in a normal AFO.
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10

Jiang, Xiaojun, Yi Li, Zhaohui He, Cui Baoling e Wenlong Dong. "Numerical Investigation of Positive Displacement Rotary Lobe Pump With Twisted Rotors". In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21844.

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The three-dimensional flow field characteristics are obtained by performing numerical simulation of flow in a lobe pump with twisted rotors. The relationship between the dynamic flow structure and the flow fluctuation is explored. Actually, the viscous incompressible Navier-Stokes equations are solved within an unsteady flow model. The dynamic mesh technique is applied to obtain the dynamic flow structure. By comparing the simulated results of straight rotor with those of twisted rotor, the effect of rotor shape on the flow fluctuation was revealed. Finally, the impact of the lobes number of rotors on flow pulsations is discussed. The results show that there is an intrinsic relationship between the flow fluctuation and the vortex in the lobe pump. The use of twisted rotors can effectively improve the internal flow characteristics of lobe pump and reduce flow fluctuation. With the increase of the number of lobes, the lobe pump output is more stable and capacity has been improved.
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Rapporti di organizzazioni sul tema "Rotary shoe"

1

Allen, Luke, Joon Lim, Robert Haehnel e Ian Dettwiller. Helicopter rotor blade multiple-section optimization with performance. Engineer Research and Development Center (U.S.), giugno 2021. http://dx.doi.org/10.21079/11681/41031.

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This paper presents advancements in a surrogate-based, rotor blade design optimization framework for improved helicopter performance. The framework builds on previous successes by allowing multiple airfoil sections to designed simultaneously to minimize required rotor power in multiple flight conditions. Rotor power in hover and forward flight, at advance ratio 𝜇 = 0.3, are used as objective functions in a multi-objective genetic algorithm. The framework is constructed using Galaxy Simulation Builder with optimization provided through integration with Dakota. Three independent airfoil sections are morphed using ParFoil and aerodynamic coefficients for the updated airfoil shapes (i.e., lift, drag, moment) are calculated using linear interpolation from a database generated using C81Gen/ARC2D. Final rotor performance is then calculated using RCAS. Several demonstrative optimization case studies were conducted using the UH-60A main rotor. The degrees of freedom for this case are limited to the airfoil camber, camber crest position, thickness, and thickness crest position for each of the sections. The results of the three-segment case study show improvements in rotor power of 4.3% and 0.8% in forward flight and hover, respectively. This configuration also yields greater reductions in rotor power for high advance ratios, e.g., 6.0% reduction at 𝜇 = 0.35, and 8.8% reduction at 𝜇 = 0.4.
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2

Rotary peening with captive shot. Office of Scientific and Technical Information (OSTI), febbraio 1998. http://dx.doi.org/10.2172/629434.

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