Relevant bibliographies by topics / Roller support

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Roller support'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Roller support"

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DeBruyne, Danielle M., Marina M. Dewhurst, Katelyn M. Fischer, Michael S. Wojtanowski, and Chris Durall. "Self-Mobilization Using a Foam Roller Versus a Roller Massager: Which Is More Effective for Increasing Hamstrings Flexibility?" Journal of Sport Rehabilitation 26, no. 1 (January 2017): 94–100. http://dx.doi.org/10.1123/jsr.2015-0035.

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Clinical Scenario:Increasing the length of the muscle–tendon unit may prevent musculotendinous injury. Various methods have been proposed to increase muscle–tendon flexibility, including self-mobilization using foam rollers or roller massagers, although the effectiveness of these devices is uncertain. This review was conducted to determine if the use of foam rollers or roller massagers to improve hamstrings flexibility is supported by moderate- to high-quality evidence.Clinical Question:Are foam rollers or roller massagers effective for increasing hamstrings flexibility in asymptomatic physically active adults?Summary of Key Findings:The literature was searched for studies on the effects of using foam rollers or roller massagers to increase hamstrings flexibility in asymptomatic physically active adults. Four randomized controlled trials were included; 2 studies provided level 2 or 3 evidence regarding foam rollers and 2 studies provided level 2 or 3 evidence regarding roller massagers. Both roller-massager studies reported increases in hamstrings flexibility after treatment. Data from the foam-roller studies did not demonstrate a statistically significant increase in hamstrings flexibility, but 1 study did demonstrate a strong effect size.Clinical Bottom Line:The reviewed moderate-quality studies support the use of roller massagers but provide limited evidence on the effectiveness of foam rolling to increase hamstrings flexibility in asymptomatic physically active adults. Flexibility gains may be improved by a longer duration of treatment and administration by a trained therapist. Gains appear to decline rapidly postrolling. Neither device has been shown to confer a therapeutic benefit superior to static stretching, and the effectiveness of these devices for preventing injury is unknown.Strength of Recommendation:Grade B evidence supports the use of roller massagers to increase hamstrings flexibility in asymptomatic physically active adults.
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Danilin, Oleksandr, Stefan Zaichenko, Stepan Shevchuk, Natalia Jukova, and Ivan Pasichniuk. "DETERMINATION OF THE CHANGE OF THE DESIGN POSITION OF THE PROFILE OF THE BELT CONVEYOR ON THE LOAD OF THE ROLLER BEARINGS." Geoengineering, no. 3 (December 14, 2020): 20–25. http://dx.doi.org/10.20535/2707-2096.3.2020.219324.

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The article attempts to establish the basic patterns in the formation of loads in the structure of the conveyor frame due to changes in the design position of the constituent elements based on analytical calculations. The amortization replacement of rollers and the establishment of a change in the projected resource caused the change in the design position.The aim of the work is to study the interaction of the elements of the belt conveyor on the convex region of the profile when the design position changes and to determine the change in the resource of the roller support elements. The purpose of the work is formulated from the analysis of unplanned stops and premature replacement of conveyor elements, in particular conveyor rollers, on the convex region of the profile.To achieve this goal the influence of the geometric parameters of the convex section of the belt conveyor profile on the force interaction of the belt and roller supports was considered, and the change in the resource of the roller bearings was determined.To characterize the geometric parameters of the convex section of the belt conveyor, the following were selected: the number of roller supports, the distance between the roller supports, the radius of curvature of the conveyor profile, the angle of the curved section. The mathematical model is based on the belt equilibrium equation, which contains the tension forces of the conveyor belt and the forces from the action of roller supports. Particular attention is paid to establishing the effect of changing the geometric parameters of the convex section on the roller bearing life. It has been established that a decrease in the radius of the transitional convex section as a result of a change in the initial design position by 2.4 times leads to an increase in the force acting on the roller support by 161%. It was found that the increase in force is the reason for the rapid exit from the operational state of the rolling bearings of the roller bearings, as evidenced by the intensive drop in the resource of the rollers (18 times).The proposed algorithm for determining the main parameters of the force interaction of the elements of the belt conveyor on the convex region of the profile will make it possible to predict the resource and prevent the conveyor from leaving the premature operational state.
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Park, Cheol Hoon, Tae Gwang Yoon, Dongwoo Kang, and Hugo Rodrigue. "High-Precision Roller Supported by Active Magnetic Bearings." Applied Sciences 9, no. 20 (October 17, 2019): 4389. http://dx.doi.org/10.3390/app9204389.

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Magnetic bearings support rotors in a non-contact way using magnetic force. Therefore, there is no friction and it is possible to measure and control the position of a rotor in the air gap. In this study, the rotational vibration of a roller was minimized using magnetic bearings, and a precision roller capable of automatic alignment using the position control function of magnetic bearings was proposed. A rotation accuracy of approximately 4.6 μm (peak-to-peak) was observed, even under a rotation of 30 rev/min and a radial force load of 300 N. The rotor position control experiment for magnetic bearings showed that 1-μm resolution position control is possible. To further improve the accuracy, the automatic alignment algorithm was proposed using magnetic bearings for the roller misalignment condition, and it was confirmed that alignment is possible at a level that the pressing force difference between both ends of the roller is within 0.3 N. Through this study, it was confirmed that rollers with magnetic bearings can be applied to precision equipment. It is expected that the implementation of the automatic alignment function will simplify the equipment configuration and maintenance compared to conventional rollers with ball bearings.
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Wang, Xiao Gang, Xiang Nan Li, and Qing Xue Huang. "Research on Force Simulation of Rolls' Deformation in the Rolling Process of Medium and Heavy Plate Leveler." Applied Mechanics and Materials 143-144 (December 2011): 517–21. http://dx.doi.org/10.4028/www.scientific.net/amm.143-144.517.

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During many factors affect the straightening precision, the shape of roller gap affect directly the flatness and the distribution of residual stress; At the same time, roll system's stiffness, as an important part of the roller leveler's whole stiffness, affect directly the design of leveling production process. In order to draw the conclusion of deformation characteristics and rules, the equivalent FEM Model on upper rolls and its support structure and investigates on the features of stress and strain after the rollers' deformation is established, based on the structural analysis of hot roller leveler for 3800mm plate steel.
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Safronov, Ye V., and A. L. Nosko. "Experimental evaluation of the load capacity of the rollers of gravity conveyors for pallets." Izvestia MGTU MAMI 1, no. 3 (2020): 59–64. http://dx.doi.org/10.31992/2074-0530-2020-45-3-59-64.

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The main approaches to calculating the load capacity of the carrying rollers of gravity conveyors are presented. It is shown that in practice, in the designs of modern non-driven conveyors for pal-lets, the priority when choosing the pitch of the carrier rollers is the stability of the movement of the load, rather than minimizing the number of rollers. In connection with the urgent task of reducing the metal consumption and the cost of gravity roller conveyors for pallets, the purpose of the work is to experimentally determine the load capacity of the rollers of gravity conveyors for pallets with plastic bearing housings. The experimental studies were carried out in the laboratory of the Depart-ment of Applied Mechanics on a Galdabini Quasar 50 universal testing machine using a special roller support for two roller designs - with a solid axis and on half-axles. The test results showed that the stiffness of a roller with a solid axis in the load range up to 670 N is about 1358.4 N / mm, and in the load range from 670 to 1500 N - 2229.9 N / mm. The rigidity of the roller on the axle shafts in the entire load range is 2048.0 N / mm. The analysis of the obtained results showed that for loads over 670N the use of the axle slightly increases the stiffness coefficient, and, on the contrary, it decreases in the load range up to 670N. In order to reduce the cost of carrying rollers with plastic bearing housings, it is advisable to use a design on semi-axles.
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Listova, M. A., V. V. Dmitrieva, and P. E. Sizin. "Reliability of the belt conveyor bed when restoring failed roller supports." IOP Conference Series: Earth and Environmental Science 942, no. 1 (November 1, 2021): 012002. http://dx.doi.org/10.1088/1755-1315/942/1/012002.

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Abstract The reliability of modern belt conveyors, whose length reaches tens of kilometers, is primarily determined by the reliability of the roller supports that support the belt and ensure its movement. As they wear out, some roller bearings fail and need to be repaired or replaced. The dynamics of the number of working roller supports is determined by the system of Kolmogorov equations. Their solution allows us to find the probabilities of finding the system in states with a different number of working elements. The article finds probabilities for two cases. In the first case, when restoring, only one roller support is repaired each time. In the second case, all roller supports are repaired or replaced. In the case of sequential recovery, the mathematical expectation of the number of properly working roller supports may be less than the total number by several units. There are always elements that need to be repaired. If the recovery rate of the elements is many times higher than the failure rate, the mathematical expectation of the number of properly operating roller supports is less than the total number of roller supports by less than one, during most of the time all roller supports are serviceable. In the case of simultaneous recovery of elements, an equally high level of reliability is achieved even with comparable failure and recovery rates. The results obtained can be used to determine the necessary reserve of spare structural elements and to plan the maintenance of conveyors.
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Zheng, Jingyang, Jinchen Ji, Shan Yin, and Van-Canh Tong. "Fatigue life analysis of double-row tapered roller bearing in a modern wind turbine under oscillating external load and speed." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 15 (March 17, 2020): 3116–30. http://dx.doi.org/10.1177/0954406220911966.

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Fatigue life analysis of roller bearing is usually performed for bearings under constant rotating speed and invariant loading conditions. For the bearings used in offshore floating direct-drive wind turbines, they often experience oscillating motions with varying loading patterns, for which the standard fatigue life analysis is not valid due to the presence of fluctuating loads. This paper presents the fatigue life analysis of a double-row tapered roller bearing under oscillating external load and speed conditions, which is used to support the main shaft of a large modern direct-drive wind turbine. First, a comprehensive quasi-static model of the double-row tapered roller bearing is developed for determining the internal load distribution of rollers. The contact pressure of rollers is then studied using an iterative scheme based on the elastic contact model. After that, the formulation of basic rating life of the double-row tapered roller bearing with oscillating external load and speed is given to calculate the fatigue life. Numerical simulations are carried out to investigate the effects of the oscillating load and speed, angular misalignment, and internal clearance on the fatigue life of the bearing.
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Cao, Shunxin, Ruijun Zhang, Shuohua Zhang, Shuai Qiao, Dongsheng Cong, and Mingxiao Dong. "Roller–rail parameters on the transverse vibration characteristics of super-high-speed elevators." Transactions of the Canadian Society for Mechanical Engineering 43, no. 4 (December 1, 2019): 535–43. http://dx.doi.org/10.1139/tcsme-2018-0083.

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Interaction and wear between wheel and rail become increasingly serious with the increase in elevator speed and load. Uneven roller surface, eccentricity of rollers, and the looseness of rail brackets result in serious vibration problems of high-speed and super-high-speed elevators. Therefore, the forced vibration differential equation representing elevator guide rails is established based on Bernoulli–Euler theory, and the vibration equation of the elevator guide shoes and the car is constructed using the Darren Bell principle. Then, the coupled vibration model of guide rail, guide shoes, and car can be obtained using the relationship of force and relative displacement among these components. The roller–rail parameters are introduced into the established coupled vibration model using the model equivalent method. Then, the influence of roller–rail parameters on the horizontal vibration of super-high-speed elevator cars is investigated. Roller eccentricity and the vibration acceleration of the car present a linear correlation, with the amplitude of the car vibration acceleration increasing with the eccentricity of the roller. A nonlinear relationship exists between the surface roughness of the roller and the vibration acceleration of the car. Increased continuous loosening of the guide rail results in severe vibration of the car at the loose position of the support.
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Bakhshi, Nima, and Mehdi Hojjati. "Effect of compaction roller on layup quality and defects formation in automated fiber placement." Journal of Reinforced Plastics and Composites 39, no. 1-2 (August 6, 2019): 3–20. http://dx.doi.org/10.1177/0731684419868845.

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Application of automated fiber placement is limited by defects formed in the prepreg tows during the layup process. An extensive experimental study is performed to investigate the effect of compaction roller on the quality of the layup. Five different compaction rollers with different stiffness and architectures were manufactured and employed to dispense prepreg tows at various process conditions. Layup quality was examined and different defects including tow buckling and blister were identified. In addition to automated fiber placement trials, static testing and finite element simulations were performed to probe the pressure distribution and contact width of each roller. This data was used to support and understand the results of the automated fiber placement trials. Results indicate the solid elastomer rollers that are compliant enough to produce the same level of contact width under similar levels of compaction forces are superior to the perforated rollers in terms of achievable layup quality.
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Simisinov, D. I., A. I. Afanas’ev, and N. G. Valiev. "Reducing the load on the roller bit support." Mining informational and analytical bulletin, no. 11-1 (2021): 197–208. http://dx.doi.org/10.25018/0236_1493_2021_111_0_197.

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Dissertations / Theses on the topic "Roller support"

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Smith, Douglas H. (Douglas Hession). "Tapered roller bearing ballscrew support system." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/34052.

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Kroona, Marie, and Lina Jacobson. "Mer än support? : -En studie om Human Resources roll i förändringsprocesser." Thesis, Högskolan i Halmstad, Akademin för hälsa och välfärd, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-28721.

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Trots att många menar att Human Resources har en allt viktigare roll i förändringsprocesser råder det brist på studier som undersöker på vilket sätt de i sitt dagliga arbete är involverade i förändringsprocesser och hur de interagerar med andra aktörer inom organisationen under processen. Syftet med denna studie är att undersöka vad HR bidrar med kopplat till processen vid planerade organisationsförändringar. Undersökningens frågeställning inriktades på vilka olika roller HR kan ta vid planerade organisationsförändringar samt vilka faktorer som påverkar HR´s delaktighet i dessa. Studien har en kvalitativ hermeneutisk ansats och baseras på sex semistrukturerade intervjuer med HR-medarbetare på två olika organisationer inom privat sektor. Resultatet visar på att HR framförallt tar två olika typer av roller som vi har benämnt supportrollen och den självständiga rollen. Dessa kopplar vi i analysen sedan till två övergripande roller som HR kan utgå ifrån i sitt agerande. De faktorer vi har sett i vår studie som påverkar HR´s delaktighet i förändringsprocesser är brist på tid, stort avstånd till kärnverksamheten och medarbetarna, vilken relation de har till cheferna samt vilken typ av förändring det handlar om.
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Sundström, Malin. "Första mötet är det bästa egentligen : Ett aktionsforskningsprojekt med syfte att utveckla kontaktmannaskapet inom kommunal äldrevård." Thesis, Kristianstad University College, School of Health and Society, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-1012.

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I ett aktionsforskningsprojekt om kontaktmannaskap deltog en arbetsgrupp på ett vårdboende i tre fokusgruppssamtal. I problemorienteringsfasen klargjordes kontaktpersonens roller. Dessa roller var relationsskaparen, länken och administratören. Rollen som relationsskapare var den mest givande för kontaktpersonen. Rollerna som relationsskapare och länk var sammanflätade då länken var beroende av att relationen fungerade. Med rollerna som grund genomfördes planeringsfasen där arbetsgruppen diskuterade hur kontaktmannaskapet behövde förändras. För att kunna fullfölja de tre rollerna behövdes utrymme i form av tid, särskilt som relationsskapare och länk. Administratören behövde också tid, men var inte på samma sätt beroende av en relation till vårdtagaren. Gruppen identifierade tre förändringsområden det första mötet, information och informationsöverföring. Det första mötet behövde utvecklas då det var grunden för en god relation som byggde på ömsesidighet och förtroende. En sådan utveckling kräver att kontaktpersonen får tid, men också stöd från enhetschef, sjuksköterska och/eller vice kontaktperson. I aktionsfasen utformade gruppen tillsammans en informationsbroschyr för att förbättra informationen. Planerade första möten har genomförts av kontaktperson och sjuksköterska både på korttidsvård och med besök i den äldres hem. Ett gott kontaktmannaskap kräver inre förutsättningar i form av vilja och kompetens hos kontaktpersonen. Det krävs också yttre förutsättningar i form av tid och stöd.


In an action research project about the system of contact persons a working team in a nursing home participated in three focus group sessions. During the reflection phase the roles of the contact person were established. These roles were the creator of relations, the link and the administrator. The role as the creator of relations was the most rewarding to the contact person. The roles as the creator of relations and the link were intertwined as the link was depending on a good relation. On the basis of the roles, the planning phase continued with discussions about how the system of contact persons could be changed. To fulfil the three roles time was needed, especially as the creator of relations and the link. The administrator also needed time, but was not dependent on a relation to the elderly person in the same way. The working team identified three areas to develop; the first meeting, information and transmission of information. The first meeting was an opportunity to start a good relation based on reciprocity and trust. Apart from time the contact person needed support from the manager, the nurse and/or the vice contact person. In the action phase the working team designed an information brochure to improve the information. Arranged first meetings have been conducted by the contact person and the nurse at the municipal transitory care center and by visit the elderly person’s house. A good system of contact persons demands internal conditions such as the will and competence within the contact person. It also demands external conditions such as time and support.

 

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Гривас, Ольга Володимирівна. "Обертова піч для випалу цементу 5х185 з модернізацією опірного вузла." Master's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/45775.

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Магістерською дисертацією наведено вибір та обґрунтування модернізації опори печі, та запропоновано ідею з патенту, що зменшує витрати на ремонт машини та всі супроводжуючі процеси, термін служби бандажів та роликів за рахунок зменшення контактних напружень, що виникають в них. Ідеї модернізації підтверджено результатами розрахунків, які виконані за допомогою сучасного програмного комплексу «ANSYS». Аналіз розрахунків довів можливість та доцільність впровадження модернізованої конструкції у виробництво.
The master's thesis presents the choice and reasoning of the modernization of the furnace support. It proposed the idea of a patent that reduces the machine repairing cost and all the accompanying processes, the life of the braces and rollers by reducing the contact stresses that appears inside them. The ideas of modernization confirmed by the results of calculations made with the help of the modern ANSYS software complex. The analysis of the calculations proved the possibility and advisability of introducing the modernized structure into production. Competitiveness and possibility of modernization implementation analyzed in the startup section.
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Грех, Вадим Олександрович, and Vadym Hrekh. "Проект дільниці ремонтного цеху для відновлення опорного катка гусеничного трактора, з дослідженням зносостійкості роликових електродів машин для контактного шовного зварювання." Master's thesis, ТНТУ, ФМТ, кафедра автомобілів, Тернопіль, Україна, 2021. http://elartu.tntu.edu.ua/handle/lib/36892.

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В кваліфікаційній роботі розроблено дільницю ремонтного цеху для технічного обслуговування та ремонту опорного катка гусеничного трактора з дослідженням зносостійкості роликових електродів машин для контактного шовного зварювання.
Іn this graduation thesis of the repair shop section for maintenance and repair of the support roller of a crawler tractor with research of wear resistance of roller electrodes of machines for contact seam welding was developed.
ВСТУП 1 ЗАГАЛЬНО-ТЕХНІЧНИЙ РОЗДІЛ 1.1. Загальна характеристика робочої машини. Опис її конструкції та принципу роботи. 1.2. Літературний та патентний огляд по аналізу умов роботи вузлів тертя. 1.3. Основні види зношення робочих поверхонь пари тертя, їх якісна оцінка та опис механізму зношення. 1.3.1. Обґрунтування вибору конструкції вузла тертя з метою підвищення його зносостійкості 1.3.2. Силовий розрахунок робочих елементів вузлів тертя. 1.3.3 Аналіз існуючих методів та вибір його оптимального варіанту для відновлення деталей. 1.4 Висновки та постановка задачі на дипломне проектування 2 ТЕХНОЛОГІЧНИЙ РОЗДІЛ 2.1 Технологічний процес розбирання робочого вузла. 2.2 Технологічний процес складання робочого вузла. 2.3 Визначення основних параметрів процесу зношення гусеничних ланцюгів і привідних коліс. 2.4 Основні етапи технічного огляду вузлів робочого агрегату. 2.5 Конструктивні особливості деталі, її експлуатаційне призначення та умови її роботи. Підготовка поверхні деталі під процес відновлення. Вибір методу та режимів відновлення зношеної поверхні 2.5.1 Вибір та обґрунтування методу відновлення поверхні 2.5.2 Розрахунок припусків на механічну обробку поверхні. 2.5.2.1 Розрахунок та вибір режимів обробки і відновлення робочої поверхні. 2.5.2.2 Порядок призначення режимів технологічного процесу відновлення поверхні деталі 2.6 Розрахунок дільниці контактно шовного зварювання 2.6.1 Розрахунок фондів часу 2.6.2 Розробка плану дільниці 2.6.3 Вибір та розрахунок вентиляції 2.6.4 Технологічне планування дільниці 3 КОНСТРУКТОРСЬКИЙ РОЗДІЛ 3.1. Силовий та кінематичний розрахунки пристосувань. 3.1.1. Токарне пристосування 3.1.2. Фрезерне пристосування 3.2 Порядок розрахунку різьбонакатних роликів 4 НАУКОВО-ДОСЛІДНИЙ РОЗДІЛ 4.1 Загальна методика проведення експериментальних досліджень. 4.1.1. Визначення основних параметрів запропонованої моделі зношування ( варіант 1 - ролики виготовлені з міді М1) 4.1.2. Визначення основних параметрів запропонованої моделі зношування ( варіант 2 – ролики виготовленні з бронзи БрХ) 4.2. Розрахунок на зношування досліджуваних роликів 4.2.1. Ролики виготовленні із міді М1 ( варіант 1). 4.2.2. Ролики виготовленні з бронзи БрХ ( варіант 2). 4.2.3 Технологічний метод підвищення надійності роликів 5 ОХОРОНА ПРАЦІ ТА БЕЗПЕКА В НАДЗВИЧАЙНИХ СИТУАЦІЯХ 5. 1 Охорона праці 5.1.1 Виробничі небезпеки на підприємстві 5.1.2 Клас небезпеки шкідливих речовин 5.1.3 Захисне заземлення 5.2 Безпека в надзвичайних ситуаціях. 5.2.1 Основні види і способи захисту населення у надзвичайних ситуаціях ВИСНОВКИ БІБЛІОГРАФІЯ ДОДАТКИ
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Жульов, Олексій Олександрович, Алексей Александрович Жулев, Oleksii Oleksandrovych Zhulov, Василь Анатолійович Смирнов, Василий Анатольевич Смирнов, Vasyl Anatoliiovych Smyrnov, and А. Воронко. "Модель стенда для выяснения характеристик видов колебаний." Thesis, Сумский государственный университет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/40577.

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Breuneval, Romain. "Surveillance de l’état de santé des actionneurs électromécaniques : application à l'aéronautique." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1313.

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L’industrie aéronautique fait face à trois enjeux majeurs : la réduction de son empreinte environnementale, l’absorption de l’augmentation du trafic et le maintien d’un haut niveau de sécurité pour des systèmes de plus en plus complexes, à coûts équivalents. La maintenance prédictive permet de répondre en partie à ces trois enjeux. Les systèmes, dont on peut prédire la durée de vie peuvent être utilisés plus longtemps, ce qui diminue le nombre de composants utilisés sur la vie d’un avion. Prédire les pannes permet également d’augmenter la disponibilité des aéronefs en évitant les arrêts non planifiés. Enfin, le suivi de l’état de vieillissement de l’avion permet d’optimiser la maintenance et ainsi de réduire les coûts. Dans les années 2000, ces méthodologies ont été appliquées sur les moteurs. Elles commencent maintenant à se généraliser aux autres systèmes avioniques. Ainsi cette thèse concerne la mise au point de méthodologies amenant à la maintenance prédictive d’actionneurs électro – mécaniques (EMA) de commande de vol. Les problématiques et les contraintes (temps de calculs, quantités de mémoire…) liées à cette thématique sont détaillées. Dans un premier temps, le calcul de signatures de défauts est abordé. Une méthode pour les systèmes visécrou, basée sur l’identification d’un modèle de frottement, est proposée. Une deuxième méthode, reposant sur l’analyse des courants à partir d’une combinaison de décomposition modale empirique ensembliste complète et d’analyse aveugle de sources, est ensuite introduite. Ces deux méthodes sont testées sur des données issues de profils non opérationnels. Ces données sont issues d’un modèle de simulation représentant finement l’actionneur dans son environnement. L’ensemble des simulations représente des essais virtuels sur une population d’EMA. A partir de ces simulations, les signatures mises au point sont calculées. Puis, afin de valider ces signatures, des métriques de performances sont calculées. Le diagnostic par reconnaissance de formes est ensuite traité. Un algorithme reposant sur une combinaison de machine à vecteur de supports et de fonctions floues d’appartenances est proposé. Celui-ci peut notamment estimer la sévérité d’un défaut. Il permet également de détecter des points ne correspondant pas à la base d’apprentissage, qui peuvent représenter des défauts inconnus ou des points appartenant à plusieurs classes à la fois, pouvant représenter des cas de défauts combinés. L’architecture d’un système de diagnostic complet, basée sur l’algorithme conçu, est détaillée. Des validations expérimentales des méthodes de calcul de signatures et de diagnostic sont ensuite menées. Ces validations reposent sur trois bases issues de trois campagnes d’essais. La première repose sur des essais d’un EMA sain sur un banc représentatif. La deuxième concerne un moteur asynchrone en défaut en régime permanent. La dernière porte sur un moteur synchrone à aimants, de type aéronautique, en défaut de courtcircuit inter-spires en régime permanent. Le respect des contraintes par l’algorithme est vérifié. Enfin, des éléments pour aller vers le pronostic sont avancés. Le processus du pronostic est détaillé. Seule une partie de ce processus est traitée, sur des données issues de vieillissement de roulements. Dans un premier temps, le partitionnement de données de vieillissement pour créer des classes de sévérité de défaut est étudié. Cette tâche a amené à proposer une métrique, dite de cohérence temporelle, permettant de vérifier qu’un résultat de partitionnement satisfait aux contraintes pour le pronostic. Puis l’algorithme de classification proposé est validé sur les données partitionnées. Ceci amène à distinguer deux méthodes de validation, une approche dite diagnostic et une dite pronostic. Une méthode de normalisation, pour l’approche pronostic, est proposée. La prédiction des signatures dans le futur est ensuite traitée. Un algorithme de régression par vecteurs de support est utilisé [etc...]
The aeronautics industry is facing three major challenges: the reduction of its environmental impact, the absorption to the air traffic increase and a high level of safety for increasing complex systems, for equivalent costs. Predictive maintenance allows answering to these issues. Systems, for which the life can be predicted, can be used for a longer time. This reduces the number of components used in the lifetime of an aircraft. To predict failures also allow increasing the availability of aircrafts by avoiding unplanned downtime. Finally, monitoring the ageing of the aircraft allows to optimize maintenance and so to reduce costs. In the 2000s, these methodologies were applied to turbojets. It starts, now, to be generalized to others avionics systems. Therefore, this work deal with predictive maintenance methodologies for electromechanical actuator (EMA) for flight controls systems. Problems and constraints (computation time, memory quantities…) related to this subject are detailed. In a first part, fault feature computation methodologies are investigated. A first method is proposed for screw/nut systems. This method is based on the identification of a friction model. A second method, based on current analysis, is presented. This method uses a combination of empirical mode decomposition and independent component analysis. The two methods are tested on data from a non-operational profile. This data are from a simulation model which represents the EMA in the aircraft environment. The simulations performed represent virtual trials on a population of EMA. From these simulations, fault features are computed. Then, performances metrics are evaluated. Diagnosis by pattern recognition is then studied. An algorithm based on support vector machine and fuzzy membership functions is proposed. This algorithm can estimate the severity of a fault. It can also detect unknown observations, which can represent unknown faults or combined faults. The architecture of a global diagnosis system, based on the proposed algorithm, is detailed. Experimental validation of fault features computation and diagnosis algorithm is performed. These validations are based on three data bases. The first one is based on trials performed on a healthy EMA on a representative bench. The second consists in an induction motor at constant speed for different types of faults. The last one is from trials on a permanent magnet synchronous machine, of aeronautics type, for different kinds of short – circuit fault severities. The respect of the aeronautics constraints is verified. At last, elements for prognosis process are given. This process is detailed. Only a part of this process is treated, on a roller bearings benchmark database. First, the clustering for prognosis is studied. A metric, which allows verifying that the obtained clusters are coherent regarding time, and thus, checks the constraints for prognosis, is given. Then the proposed diagnosis algorithm is validated on the clustered data. This brought to perform two kinds of validation, a diagnosis oriented one and a prognosis oriented one. A method to normalize data for the prognosis oriented validation, based on sigmoid function, is given. The prediction of the features in the future is studied. A regression algorithm based on support vector regression is used. Finally, the diagnosis algorithm is applied to the predicted data. This allows to estimate the end of life, and so the remaining useful life for a given time. These estimations are evaluated regarding different kinds of performance metrics and regarding the constraints of the aeronautics applicative field
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Hosseini, SayedMohammad. "A Statistical Approach to Modeling Wheel-Rail Contact Dynamics." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/101864.

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The wheel-rail contact mechanics and dynamics that are of great importance to the railroad industry are evaluated by applying statistical methods to the large volume of data that is collected on the VT-FRA state-of-the-art roller rig. The intent is to use the statistical principles to highlight the relative importance of various factors that exist in practice to longitudinal and lateral tractions and to develop parametric models that can be used for predicting traction in conditions beyond those tested on the rig. The experiment-based models are intended to be an alternative to the classical traction-creepage models that have been available for decades. Various experiments are conducted in different settings on the VT-FRA Roller Rig at the Center for Vehicle Systems and Safety at Virginia Tech to study the relationship between the traction forces and the wheel-rail contact variables. The experimental data is used to entertain parametric and non-parametric statistical models that efficiently capture this relationship. The study starts with single regression models and investigates the main effects of wheel load, creepage, and the angle of attack on the longitudinal and lateral traction forces. The assumptions of the classical linear regression model are carefully assessed and, in the case of non-linearities, different transformations are applied to the explanatory variables to find the closest functional form that captures the relationship between the response and the explanatory variables. The analysis is then extended to multiple models in which interaction among the explanatory variables is evaluated using model selection approaches. The developed models are then compared with their non-parametric counterparts, such as support vector regression, in terms of "goodness of fit," out-of-sample performance, and the distribution of predictions.
Master of Science
The interaction between the wheel and rail plays an important role in the dynamic behavior of railway vehicles. The wheel-rail contact has been extensively studied through analytical models, and measuring the contact forces is among the most important outcomes of such models. However, these models typically fall short when it comes to addressing the practical problems at hand. With the development of a high-precision test rig—called the VT-FRA Roller Rig, at the Center for Vehicle Systems and Safety (CVeSS)—there is an increased opportunity to tackle the same problems from an entirely different perspective, i.e. through statistical modeling of experimental data. Various experiments are conducted in different settings that represent railroad operating conditions on the VT-FRA Roller Rig, in order to study the relationship between wheel-rail traction and the variables affecting such forces. The experimental data is used to develop parametric and non-parametric statistical models that efficiently capture this relationship. The study starts with single regression models and investigates the main effects of wheel load, creepage, and the angle of attack on the longitudinal and lateral traction forces. The analysis is then extended to multiple models, and the existence of interactions among the explanatory variables is examined using model selection approaches. The developed models are then compared with their non-parametric counterparts, such as support vector regression, in terms of "goodness of fit," out-of-sample performance, and the distribution of the predictions. The study develops regression models that are able to accurately explain the relationship between traction forces, wheel load, creepage, and the angle of attack.
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Hunt, Kristen. "Design Analysis of Roller Coasters." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-theses/250.

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Each year 300 million people ride roller coasters at amusement parks across the United States. Although they are meant for joy and entertainment, the design is very crucial and regulated. Understanding the interaction between components and humans can help create a more thrilling and safer ride. This study researched the design of the course and the structural supports. A unique roller coaster was designed, investigating the relationship between velocity and G forces. With the profile design complete, the corresponding forces resulting from the track and train weight and train movement were calculated to determine the required dimensions of the structural support columns. This work investigated the relationship between the features of the roller coaster and the material properties of the structural supports, determining which are most impactful for the loading conditions. These results can be used to determine the required properties of a roller coaster’s structural system to maximize the material usage to minimize resources and cost.
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Landry-Meyer, Laura. "Grandparents raising grandchildren : an investigation of roles and support /." Connect to resource, 2000. http://rave.ohiolink.edu/etdc/view.cgi?acc%5Fnum=osu1250708748.

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Books on the topic "Roller support"

1

Aymanns, Peter. Krebserkrankung und Familie: Zur Rolle familialer Unterstützung im Prozess der Krankheitsbewältigung. Bern: Huber, 1992.

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Family life and family support: A feminist analysis. Houndmills, Basingstoke, Hampshire: Palgrave Macmillan, 2004.

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Featherstone, Bríd. Family life and family support: A feminist analysis. Basingstoke: Palgrave Macmillan, 2004.

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Woman to woman: From sabotage to support. Far Hills, NJ: New Horizon Press, 1987.

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Office, National Audit. Ministry of Defence: Support information technology. London: H.M.S.O., 1991.

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Office, National Audit. Ministry of Defence: Support for defence exports. London: H.M.S.O., 1989.

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Who supports the family?: Gender and breadwinning in dual-earner marriages. Stanford, Calif: Stanford University Press, 1997.

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Women in panchayats: A study of role conflict. New Delhi: Serials Publications, 2011.

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Len'kov, Roman. Higher education as a resource management socio-cultural modernization of regions. ru: INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/1084388.

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The monograph examines the actual theoretical and applied aspects of institutional and regulatory support for social and cultural modernization of regions, including the specification of higher education as a resource and the conditions of modernization, periodization and content of practice of management reform of higher education, the evolution of the role of forecasting in public administration the graduate school. The analysis of resource and policy support socio-cultural modernization of the regions population with higher education through the explication of the problem of the "Assembly" of the future intelligentsia as a socio-cultural potential of modernization, the role of the Institute of higher education in the solution of problems of modernization. The empirical study support a highly skilled regional population policy of modernization in four regions: Moscow region, Bashkortostan, Belgorod region and the Republic of Kalmykia. Proposals for processing of the array data of the respondents with higher education, complemented by social and cultural portraits and information card regions. For professionals and experts on issues of science, higher education and public administration. Will be sought after by post-graduate students, teachers and scientific employees of educational and academic institutions.
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United States. National Aeronautics and Space Administration., ed. Planetary-gear-support bearing test rig design. King of Prussia, Penn: SKF Industries, 1985.

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Book chapters on the topic "Roller support"

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Xu, Yun-Jie, and Shu-Dong Xiu. "Wavelet Packet Transform and Support Vector Machine Based Discrimination of Roller Bearings Fault." In Communications in Computer and Information Science, 422–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21402-8_67.

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Jia, Guifeng, Shengfa Yuan, and Chengwen Tang. "Fault Diagnosis of Roller Bearing Based on PCA and Multi-class Support Vector Machine." In Computer and Computing Technologies in Agriculture IV, 198–205. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-18369-0_22.

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Maraini, Daniel, and C. Nataraj. "Freight Car Roller Bearing Fault Detection Using Artificial Neural Networks and Support Vector Machines." In Mechanisms and Machine Science, 663–72. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09918-7_59.

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Islam, M. M. Manjurul, Sheraz A. Khan, and Jong-Myon Kim. "Multi-fault Diagnosis of Roller Bearings Using Support Vector Machines with an Improved Decision Strategy." In Lecture Notes in Computer Science, 538–50. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-22053-6_57.

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Fadin, Yu M., S. S. Latyshev, P. A. Khakhalev, and T. A. Khakhaleva. "Study of the Strength Characteristics of the Support Frame of Horizontal Roller Mill in NX CAE." In Lecture Notes in Civil Engineering, 191–99. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-81289-8_25.

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Sanchez, Andres R. "Support Roles and Behaviors." In Technical Support Essentials, 141–59. Berkeley, CA: Apress, 2009. http://dx.doi.org/10.1007/978-1-4302-2548-5_7.

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Yentsch, Clarice M., and Carl J. Sindermann. "Scientific Support Roles." In The Woman Scientist, 111–23. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4899-5976-8_7.

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Zhu, Haibin, Mengchu Zhou, and Ming Hou. "Support Collaboration with Roles." In Contemporary Issues in Systems Science and Engineering, 575–98. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119036821.ch15.

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Tan, Bien-Keem, Weihao Liang, Preetha Madhukumar, and Benita K. T. Tan. "Nipple Reconstruction with Rolled Dermal Graft Support." In Nipple-Areolar Complex Reconstruction, 455–61. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60925-6_57.

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Leyden, Dennis Patrick, and Albert N. Link. "Policy Initiatives to Support Innovation." In Government’s Role in Innovation, 153–70. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2936-7_7.

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Conference papers on the topic "Roller support"

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Xiao, Hang Wan, Wei Dong Zhao, and Yong Liu Sheng. "Study on the Virbration of Slab Mill Support Roller." In 3rd International Conference on Material, Mechanical and Manufacturing Engineering (IC3ME 2015). Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/ic3me-15.2015.135.

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WANG, Qi-li, and Yan LI. "Innovative Design of Belt Conveyor Support Roller Based on TRIZ." In 3rd International Conference on Material Engineering and Application (ICMEA 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icmea-16.2016.14.

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Chen, Shasha, Weihai Chen, Jingmeng Liu, and Wenjie Chen. "A roller support stage with remote center of motion for roll-to-roll printed electronics." In 2017 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO). IEEE, 2017. http://dx.doi.org/10.1109/3m-nano.2017.8286260.

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Khmelev, Vladimir N., Alexey N. Slivin, and Alexey D. Abramov. "Ultrasonic welding with the application of rotating welding tool and roller support." In 2015 16th International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM). IEEE, 2015. http://dx.doi.org/10.1109/edm.2015.7184542.

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Weng, Peng-Yi, and Meng-Kun Liu. "Roller bearing fault diagnosis based on wavelet packet decomposition and support vector machine." In 2017 International Conference on Applied System Innovation (ICASI). IEEE, 2017. http://dx.doi.org/10.1109/icasi.2017.7988338.

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Matsubara, Atsushi, Kotaro Mori, and Daisuke Kono. "Machining Vibration Suppression of a Cylindrical Part by a Point-Contact Support." In JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/lemp2020-8550.

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Abstract Aircraft engine cases employ a thin-walled cylindrical structure for the reduction of fuel consumption. The machining of such parts requires support systems as cutting forces generate shell mode vibrations. There has been much research on the design of vibration suppression devices such as mass dampers, tuned mass dampers, active dampers, and fixturing stretch. Although such devices can offer excellent performance in vibration suppression, cost, and time for manufacturing and setup with tuning are problems. In this paper, the test results of a simple support system that suppresses the vibration modes of a cylindrical part are reported. A support element employs two-contacts in the curved surface. Multiple support elements are arranged according to the number of antinodes of shell modes. Each support has two rollers with a rotating head; the roller contact aligned in the curved surface. For the decision of the number of the support elements, modal analysis was carried out for a cylindrical part. An excitation test was carried out to evaluate the frequency response of a supported cylinder, and several peaks in frequency response were found to be suppressed. A cutting test with an endmill was carried out to evaluate the vibration levels. The experimental results show that the support can suppress forced vibration during machining.
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Shibukawa, Yuichi, Takeshi Yamamoto, and Haruhito Mori. "Improvement of the High Rigidity Power-Roller Support Structure in a Half-Toroidal CVT." In 2004 Powertrain & Fluid Systems Conference & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2004. http://dx.doi.org/10.4271/2004-01-2930.

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Tang, Gang, Guozheng Li, and Huaqing Wang. "Sparse Component Analysis Based on Support Vector Machine for Fault Diagnosis of Roller Bearings." In 2017 International Conference on Sensing, Diagnostics, Prognostics and Control (SDPC). IEEE, 2017. http://dx.doi.org/10.1109/sdpc.2017.85.

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Vennapusa, Pavana K. R., David J. White, and Heath Gieselman. "Influence of Support Conditions on Roller-Integrated Machine Drive Power Measurements for Granular Base." In International Foundation Congress and Equipment Expo 2009. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41023(337)54.

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Banwatt, A. S., and R. G. Sauve´. "Calandria Tube to Tubesheet Roller-Expanded Joint Qualification." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93645.

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The complex calandria tube to calandria tubesheet roller-expanded joint in CANDU nuclear reactors is usually qualified by test. In this paper, a state-of-the-art numerical simulation is undertaken in order to improve the understanding of the behaviour of the joint to support design modifications and provide assurance that the test rig envelopes behaviour of the in-situ reactor assembly. Parameters such as hoop stress, and plastic deformation of the assembly are predicted. The analysis results are also compared with the available test data and in-situ experimental data. The analysis results show that the test performed to qualify the joint using a small plate and single joint is representative of the in-situ reactor configuration.
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Reports on the topic "Roller support"

1

Subrahmanian, Eswaran, Sudarsan Rachuri, Abdelaziz Bouras, Steven J. Fenves, Sebti Foufou, and Ram D. Sriram. The role of standards in product lifecycle management support. Gaithersburg, MD: National Institute of Standards and Technology, 2006. http://dx.doi.org/10.6028/nist.ir.7289.

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Ladner, IV, and Joseph E. The Evolving Role of the Army Field Support Brigade. Fort Belvoir, VA: Defense Technical Information Center, March 2011. http://dx.doi.org/10.21236/ada543692.

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Domingo, Edwin C. U.S. Army Reserves Roles: Consequence Management in Support of Homeland Security. Fort Belvoir, VA: Defense Technical Information Center, March 2002. http://dx.doi.org/10.21236/ada402132.

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Pickering, Isaac D. Enhancing the Strategic Roles of the National Guard: Domestic Support Operations. Fort Belvoir, VA: Defense Technical Information Center, April 1997. http://dx.doi.org/10.21236/ada326775.

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Johnston, Stanley W., and Jr. Domestic Support Operations: Military Roles, Missions, and Interface with Civilian Agencies. Fort Belvoir, VA: Defense Technical Information Center, March 1997. http://dx.doi.org/10.21236/ada326931.

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Seal, Thomas E. Military Support to Foreign Consequence Management Operations: Rethinking Roles, Functions, and Responsibilities. Fort Belvoir, VA: Defense Technical Information Center, May 1998. http://dx.doi.org/10.21236/ada351656.

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Mansfield, Layla. Organizational Calling and Safety: The Role of Workload and Supervisor Support. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6118.

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Low, Pui-Man P. The Role of Veterans Affairs in Support of DOD in Biodefense. Fort Belvoir, VA: Defense Technical Information Center, April 2015. http://dx.doi.org/10.21236/ad1001643.

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Flores, P., L. Griego, and J. Weeks. Production Capability Assurance Program (PCAP) data base support process/procedures and roles/responsibilities. Office of Scientific and Technical Information (OSTI), April 1994. http://dx.doi.org/10.2172/10158011.

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Shaikh, Rashid. Support for Conference Entitled The Role of Neural Plasticity in Chemical Intolerance"". Fort Belvoir, VA: Defense Technical Information Center, October 2000. http://dx.doi.org/10.21236/ada383928.

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