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Статті в журналах з теми "Combined axial tool"
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Toh, C. K. "Tool life and tool wear during high-speed rough milling using alternative cutter path strategies." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 217, no. 9 (September 1, 2003): 1295–304. http://dx.doi.org/10.1243/095440503322420223.
Повний текст джерелаАнотація:
The paper is concerned with a feasibility study of tool life and tool wear when employing high depths of cut (between 10 and 20 mm) and different cutter path strategies in the high-speed milling (HSM) of hardened die/mould steel. Following a review of previous work, experimental data are presented on the peripheral milling of hardened AISI H13 steel (HRC 52) using raster, single-direction raster and offset machining strategies. Coated carbide corner-radius end mills with a diameter of 10mm were employed with a fixed cutting speed of 314m/min and a feed per tooth of 0.067mm. From the experimental results it was realized that a raster cutter path strategy (combination of up and down milling) combined with high-depth roughing achieved the lowest tool wear. The offset strategy achieved the lowest tool life at all axial depths of cut within the range investigated. The experimental results clearly show that cutter path strategies and axial depths of cut have a significant effect on the tool life and tool wear for the cutters employed.
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Srichok, Thanatkij, Rapeepan Pitakaso, Kanchana Sethanan, Worapot Sirirak, and Parama Kwangmuang. "Combined Response Surface Method and Modified Differential Evolution for Parameter Optimization of Friction Stir Welding." Processes 8, no. 9 (September 1, 2020): 1080. http://dx.doi.org/10.3390/pr8091080.
Повний текст джерелаАнотація:
In this study, we constructed a new algorithm to determine the optimal parameters for friction stir welding including rotational speed, welding speed, axial force, tool pin profile, and tool material. The objective of welding is to maximize the ultimate tensile strength of the welded aluminum. The proposed method combines the response surface method and the modified differential evolution algorithm (RSM-MDE). RSM-MDE is a method that involves both experimental and simulation procedures. It is composed of four steps: (1) finding the number of parameters and their levels that affect the efficiency of the friction stir welding, (2) using RSM to formulate the regression model, (3) using the MDE algorithm to find the optimal parameter of the regression model obtained from (2), and (4) verifying the results obtained from step (3). The optimal parameters generated by the RSM-MDE method were a rotation speed of 1417.68 rpm, a welding speed of 60.21 mm/min, an axial force of 8.44 kN, a hexagon-tapered tool pin profile, and the SKD 11 tool material. The ultimate tensile strength obtained from this set of parameters was 294.84 MPa, which was better than that of the RSM by 1.48%.
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Wang, Wei, and Jian Guo Yang. "A Combined Error Model for Thermal Error Compensation of Machine Tools." Advanced Materials Research 820 (September 2013): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amr.820.147.
Повний текст джерелаАнотація:
In this paper, a combined error model for thermal error compensation of machine tools is presented. Through the analysis of thermal error data of machine spindle at different temperatures, the error variation law is obtained. Experiments on the axial directional spindle deformation on a CNC machine center are conducted to build and validate the proposed models. The experimental validations show that the thermal errors of the machine tool are reduced effectively after applying the error compensation approach. The combined error model performs better than the traditional time series and neural network model in terms of prediction accuracy and robustness, which means that the new model is more suitable for complex working conditions in industrial applications.
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Tsagkir Dereli, Tountzer, Nils Schmidt, Tim Furlan, Raphael Holtermann, Dirk Biermann, and Andreas Menzel. "Simulation Based Prediction of Compliance Induced Shape Deviations in Internal Traverse Grinding." Journal of Manufacturing and Materials Processing 5, no. 2 (June 8, 2021): 60. http://dx.doi.org/10.3390/jmmp5020060.
Повний текст джерелаАнотація:
Internal traverse grinding (ITG) using electroplated cBN tools in high-speed grinding conditions is a highly efficient manufacturing process for bore machining in a single axial stroke. However, process control is difficult. Due to the axial direction of feed, changes in process normal force and thus radial deflection of the tool and workpiece spindle system, lead to deviations in the workpiece contour along the length of the bore, especially at tool exit. Simulations including this effect could provide a tool to design processes which enhance shape accuracy of components. A geometrical physically-based simulation is herein developed to model the influence of system compliance on the resulting workpiece contour. Realistic tool topographies, obtained from measurements, are combined with an FE-calibrated surrogate model for process forces and with an empirical compliance model. In quasistatic experimental investigations, the spindle deflection is determined in relation to the acting normal forces by using piezoelectric force measuring elements and eddy current sensors. In grinding tests with in-process force measurement technology and followed by measurement of the resulting workpiece contours, the simulation system is validated. The process forces and the resulting characteristic shape deviations are predicted in good qualitative accordance with the experimental results.
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Pa, Pai Shan. "Grinding Finishing Merging Electropolishing on Hole-Wall Surfaces." Advanced Materials Research 97-101 (March 2010): 4071–74. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.4071.
Повний текст джерелаАнотація:
The current study presents a method for finishing hole-wall surfaces, superior to that obtainable by traditional boring, using a simultaneous grinding and electropolishing process. A specially designed finishing tool, that includes a nonconductive grinding wheel and an electrode is employed in the process. The form of the tool and the machining process are different from those used in electrochemical grinding (ECG). A high power electrical supply is not required with this design of finishing tool because the axial feed allows for the use of a smaller interactive area between the electrode and the hole wall surface. The experimental results show that a high current flow combined with a fast axial feed rate for the tool is an important advantage to the finishing process. The finishing effect is better with high rotational tool speeds because discharge of the electropolishing dregs and grinding cuttings becomes more efficient and this is also advantageous to the grinding finishing process. Pulsed direct current can slightly improve the electrochemical finishing effect, but machining takes longer and this raises costs. A small edge radius on the electrode also provides more than sufficient discharge and gives a better finish. We intend to make a complete evaluation of the processing parameter data so that the use of this method for hole-wall surface finishing may be extended in the future. The combined application of grinding and electropolishing is crucial to this method and the specially designed tool and the new finishing process are highly efficient and inexpensive.
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Степанов, Михаил Сергеевич, and Марина Сергеевна Иванова. "Development of the mathematical model for the choice of the optimal cutting condition with combined axial tool." Technology audit and production reserves 4, no. 1(24) (July 23, 2015): 69. http://dx.doi.org/10.15587/2312-8372.2015.47795.
Повний текст джерела
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Ganapathy, T., K. Lenin, and K. Pannerselvam. "Process Parameters Optimization of Friction Stir Welding in Aluminium Alloy 6063-T6 by Taguchi Method." Applied Mechanics and Materials 867 (July 2017): 97–104. http://dx.doi.org/10.4028/www.scientific.net/amm.867.97.
Повний текст джерелаАнотація:
This paper deals with the effective application of friction stir welding similar to butt joining technique.AL6063 T-6 alloys prepared in 125x 100 x 7mm thickness plate and FSW tool setup were H13 of diameter 25mm rotary tool with straight cylindrical pin profile. The maximum strength was considered for selection of combined process parameter. The process parameters were optimized using Taguchi method. The Rotational speed, welding speed, and axial speed are the main process parameter which taken into our consideration. The optimum process parameters are determined with reference to tensile strength of the joint. From the experiments, it was found the effects of welding parameter are the axial force is highest substantial parameter to determining the tensile strength of the joint. The paper which revealed the optimal values of process parameter are to acquire a maximum tensile strength of friction stir welded AL6063-T6 plates is 101.6Mpa with the combination level of rotational speed, welding speed and axial force are found to be 1100 RPM, 60 mm/min and 12.5 KN. validation test was carried out and results were nearer to the optimized results confirmed by the optimum results.
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Zhu, Lin, and De Ming Xiao. "The Monitoring and Analysis on the State of Deep Hole Drilling Based on Multi-Sensor Combined Detection Technology." Key Engineering Materials 392-394 (October 2008): 645–49. http://dx.doi.org/10.4028/www.scientific.net/kem.392-394.645.
Повний текст джерелаАнотація:
A kind of multi-sensor detection device was designed by using multi-sensor combined detection technology. The signal of axial force, torque and vibration in vertical and horizontal direction in deep hole drilling were collected respectively, and delivered to computer for processing by using data collection device. And then the feature parameters that can reflect the cutting tool wear were abstracted by means of the method of time-domain analysis and frequency-domain analysis. Finally, the state was classified by mode identification method and the judgment samples are also obtained.
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Variola, Angela, Maria Elisabetta Zanolin, Giovanni Cipriano, Pierluigi Macchioni, Federica Martinis, Annalisa Pasetti, Mario Grassi, et al. "The IBIS-Q [IBd Identification of Spondyloarthritis Questionnaire]: A Novel Tool to Detect Both Axial and Peripheral Arthritis in Inflammatory Bowel Disease Patients." Journal of Crohn's and Colitis 14, no. 12 (May 15, 2020): 1680–86. http://dx.doi.org/10.1093/ecco-jcc/jjaa096.
Повний текст джерелаАнотація:
Abstract Background and Aims Both peripheral and axial spondyloarthritis [SpA] occur in inflammatory bowel disease [IBD] and represent the commonest extra-intestinal manifestation. We aimed to develop an easy and quick questionnaire through psychometric analysis, to identify peripheral and axial SpA in IBD patients within an integrated combined multidisciplinary rheumatological-gastroenterology clinic. Methods Initially, SpA-IBD experts generated a 42-item list covering SpA manifestations including spinal, articular, and entheseal involvement. The new questionnaire was administered before routine clinical IBD assessment. On the same day, rheumatological assessment, blinded to both history and questionnaire results, was performed to explore the presence of the Assessment of SpondyloArthritis International Society [ASAS] criteria for SpA, diagnostic criteria for fibromyalgia [FM], and non-specific low back pain [NSLB]. Factorial analysis of questionnaire items to identify the main factors—receiver operating characteristic [ROC] curves for sensitivity/specificity and Youden index for cut-off—were performed. Results Of the 181 consecutive patients, 56 met the ASAS SpA criteria [prevalence of 30%] with 10 new cases detected [5.5%: seven peripheral and three axial]. Through the psychometric and factorial analysis, we selected 14 items for the final questionnaire [named IBIS-Q]. The IBIS-Q was quick and performed well for detection of axial SpA and peripheral SpA (area under the curve [AUC] 0.88 with 95% confidence interval [CI] 0.830.93). A cut-off of three positive questions had a sensitivity 93% and specificity 77% for SpA patient identification. Conclusions The IBIS-Q is a useful and simple tool to use in IBD clinics for SpA detection, with a good statistical performance. Further studies are needed to validate it.
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Benuzzi, E., and F. Soavi. "A Theoretical Investigation for High-Speed Cold Forging of Short Metal Cylinders Between Two Large Elastic Tools." Journal of Engineering for Industry 107, no. 3 (August 1, 1985): 266–74. http://dx.doi.org/10.1115/1.3185997.
Повний текст джерелаАнотація:
A theoretical solution is obtained for the pressure distribution at the die-material interface during a high-speed cold forging operation of a short metal cylinder workpiece, taking into account the elastic deformation of the tool considered as a half-space. The influence of the combined effects of axial and radial inertia forces, impact velocity, frictional conditions, plastic resistance of material, and radius to height ratio on pressure distribution and die surface deflection, are numerically evaluated. An illustrative example of dynamic compression with a gravity drop hammer is presented.
Дисертації з теми "Combined axial tool"
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Иванова, Марина Сергеевна. "Технологическое обеспечение производительности и качества обработки отверстий деталей гидропневмосистем комбинированным осевым инструментом". Thesis, НТУ "ХПИ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/20285.
Повний текст джерелаАнотація:
Диссертация на соискание ученой степени кандидата технических наук по специальности 05.02.08 – технология машиностроения. – Национальный технический университет "Харьковский политехнический институт", Харьков, 2016.
Диссертация посвящена решению важной научно-технической задачи повышения производительности и качества обработки отверстий в деталях элементов гидропневмосистем за счет выбора оптимальной структуры и назначения параметров ТП обработки, который осуществляется КОИ. Рассмотрены технологические факторы, влияющие на показатели точности и качества обрабатываемого отверстия. Разработана математическая модель формирования структуры ТП с использованием КОИ и выбора оптимального варианта на основе статистического анализа конструктивно-технологических характеристик заданной номенклатуры отверстий и рекомендаций к конструированию КОИ. Разработана математическая модель, описывающая порядок компоновки ступеней КОИ и принцип их работы в зависимости от концентрации технологических переходов на основе математического аппарата булевой алгебры. Разработана математическая модель для многокритериального выбора рациональных режимов резания, которые позволяют повысить производительность обработки. В результате исследования суммарной осевой силы и суммарного крутящего момента, действующих на КОИ, определенны соотношения диаметров ступеней, которые позволяют уменьшить нагрузку на инструмент и снизить энергозатраты. Предложены рекомендации по уменьшению влияния погрешностей предварительной обработки на точность отверстия за счет разбиения припуска по заданному закону. Теоретически и экспериментально исследована зависимость направления действия неуравновешенной радиальной силы резания на точность обработки отверстий КОИ. Разработана инженерная методика построения рационального технологического процесса обработки заданной номенклатуры отверстий, основанная на предварительном анализе конструктивно-технологических характеристик заданной номенклатуры отверстий и выборе наиболее часто встречающихся путем построения точечных диаграмм. Для повышения эффективности технологического процесса обработки отверстий за счет сокращения номенклатуры применяемых инструментов, а также уменьшения временных и материальных затрат на изготовление комплекта КОИ, разработан модульный КОИ (патент Украины на полезную модель № 49356).Thesis for granting the Degree of Candidate of Technical Sciences on a specialty 05.02.08 – Manufacturing engineering. – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2016. The thesis is dedicated to solving the important scientific and technical problem of efficiency and quality increase of hole-making operations in parts of hydropneu-matic systems by choice of optimal manufacturing process structure and its parame-ters which are realized by combined axial tool. Mathematical model of forming manufacturing process structure based on combined axial tool using and optimum alternative choice which is based on statistical analysis of design and technological parameters of given holes range and guidelines for combined axial tool design is developed. Mathematical model describing the order of assembly combined axial tool steps and principle of their operation subject to concentration of manufacturing steps and based on mathematical apparatus of Boolean algebra is developed. Mathematical model of multicriteria choice of rational cutting conditions which allows increasing the machining efficiency is proposed. Based on results of research of total axial force and total torque operating on combined axial tool diameters and lengths ratios of combined axial tool are determined. Recommendations of decreasing of errors influence from preprocess machining on hole accuracy due to decomposition of excess material under the given principle. The dependence of action direction of unbalanced radial cutting force on accuracy of hole-making operations by combined axial tool is investigated theoretically and experimentally.
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Іванова, Марина Сергіївна. "Технологічне забезпечення продуктивності та якості обробки отворів деталей гідропневмосистем комбінованим осьовим інструментом". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/20281.
Повний текст джерелаАнотація:
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.02.08 – технологія машинобудування. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2016.
Дисертація присвячена вирішенню важливої науково-технічної задачі підвищення продуктивності та забезпечення якості обробки отворів в деталях елементів гідропневмосистем за рахунок вибору оптимальної структури і призначення параметрів технологічного процесу обробки, що здійснюється КОІ. Розроблено математичну модель формування структури технологічного процесу з використанням КОІ та вибору оптимального варіанта на основі статистичного аналізу конструктивно-технологічних характеристик заданої номенклатури отворів та рекомендацій до конструювання КОІ. Розроблено математичну модель, яка описує порядок компонування ступенів КОІ та принцип їх роботи в залежності від концентрації технологічних переходів на основі математичного апарата булевої алгебри. Розроблено математичну модель для багатокритеріального вибору раціональних режимів різання, яка дозволяє підвищити продуктивність обробки. В результаті дослідження сумарної осьової сили та сумарного крутного моменту, що діють на КОІ, визначені співвідношення діаметрів ступенів, що дозволяють зменшити навантаження на інструмент та знизити енерговитрати. Запропоновано рекомендації щодо зменшення впливу похибок попередньої обробки на точність отвору за рахунок розбиття припуску за заданим законом. Теоретично та експериментально досліджена залежність напрямку дії неврівноваженої радіальної сили різання на точність обробки отворів КОІ.Thesis for granting the Degree of Candidate of Technical Sciences on a specialty 05.02.08 – Manufacturing engineering. – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2016. The thesis is dedicated to solving the important scientific and technical problem of efficiency and quality increase of hole-making operations in parts of hydropneu-matic systems by choice of optimal manufacturing process structure and its parame-ters which are realized by combined axial tool. Mathematical model of forming manufacturing process structure based on combined axial tool using and optimum alternative choice which is based on statistical analysis of design and technological parameters of given holes range and guidelines for combined axial tool design is developed. Mathematical model describing the order of assembly combined axial tool steps and principle of their operation subject to concentration of manufacturing steps and based on mathematical apparatus of Boolean algebra is developed. Mathematical model of multicriteria choice of rational cutting conditions which allows increasing the machining efficiency is proposed. Based on results of research of total axial force and total torque operating on combined axial tool diameters and lengths ratios of combined axial tool are determined. Recommendations of decreasing of errors influence from preprocess machining on hole accuracy due to decomposition of excess material under the given principle. The dependence of action direction of unbalanced radial cutting force on accuracy of hole-making operations by combined axial tool is investigated theoretically and experimentally.
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Карпусь, В. Є., та М. С. Іванова. "Конструктивно-технологічний аналіз обробки отворів комбінованими осьовими інструментами". Thesis, Видавництво СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/11394.
Повний текст джерелаЧастини книг з теми "Combined axial tool"
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Fechtner, Robert D., and Albert S. Khouri. "Early Vision Loss After Trabeculectomy." In Complications of Glaucoma Surgery. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780195382365.003.0027.
Повний текст джерелаАнотація:
“This surgery is designed to help you preserve the vision you have. If we are completely successful, you will not see worse once we are done.” Hardly an encouraging message we give to patients needing glaucoma surgery. An experienced glaucoma surgeon knows that aqueous diversion procedures are fraught with complications, including the ever terrifying loss of vision. Early complications of trabeculectomy that can lead to vision loss can be categorized as refractive, inflammatory/infectious, hemorrhagic, and other. It is important to recognize these complications promptly and understand the appropriate time to intervene. Thoughtful preoperative planning, meticulous technique, and a dose of good luck can help prevent these complications. It is the ability to anticipate, avoid, and manage complications that distinguishes the successful and satisfied glaucoma surgeon from a frustrated one. Trabeculectomy may induce new spherical and cylindrical aberrations. When intraocular pressure (IOP) is reduced, and particularly if there is overfiltration, the lens-iris diaphragm moves forward, and the anterior chamber shallows. These combined actions usually induce a spherical refractive error (myopic shift). The clinical signs of a myopic shift will be a shallow anterior chamber and visual acuity that will improve with a pinhole occluder or refraction. Interestingly, should the overfiltration be accompanied by macular edema, the myopic effect may be counteracted by a hyperopic shift due to macular elevation and shortening of axial length, and the patient may not have any change in refraction or may even have a hyperopic shift. For more information about axial length and changes in refraction, including after trabeculectomy, see Chapter 41. Astigmatic shift can have several origins. If a trabeculectomy flap is dissected too far anteriorly into the peripheral cornea and not sutured securely back to its origin, “against the rule” astigmatism can be induced. If a superiorly located flap is sutured with too much tension, astigmatism can be induced along the axis of the tightest suture(s), usually “with the rule.” (See Chapter 26.) Additionally, uneven suture tension in the conjunctival closure (whether limbus- or fornix-based) can affect the degree of postoperative astigmatism.
Тези доповідей конференцій з теми "Combined axial tool"
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Bui, Son, Hai Ngo, Nam Nguyen, Geoff Blackwell, and Jake Trethewey. "Axial Oscillation Tool Combined with Optimized Bent Motor BHA's Successfully Drills Record 3D Horizontal Granitic Basement Section in Vietnam." In SPE Asia Pacific Oil and Gas Conference and Exhibition. Society of Petroleum Engineers, 2018. http://dx.doi.org/10.2118/191872-ms.
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Fehrenbacher, Axel, Christopher B. Smith, Neil A. Duffie, Nicola J. Ferrier, Frank E. Pfefferkorn, and Michael R. Zinn. "Combined Temperature and Force Control for Robotic Friction Stir Welding." In ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1161.
Повний текст джерелаАнотація:
The objective of this research is to develop a closed-loop control system for robotic friction stir welding (FSW) that simultaneously controls force and temperature in order to maintain weld quality under various process disturbances. FSW is a solid-state joining process enabling welds with excellent metallurgical and mechanical properties, as well as significant energy consumption and cost savings compared to traditional fusion welding processes. During FSW, several process parameter and condition variations (thermal constraints, material properties, geometry, etc.) are present. The FSW process can be sensitive to these variations, which are commonly present in a production environment; hence, there is a significant need to control the process to assure high weld quality. Reliable FSW for a wide range of applications will require closed-loop control of certain process parameters. A linear multi-input-multi-output process model has been developed that captures the dynamic relations between two process inputs (commanded spindle speed and commanded vertical tool position) and two process outputs (interface temperature and axial force). A closed-loop controller was implemented that combines temperature and force control on an industrial robotic FSW system. The performance of the combined control system was demonstrated with successful command tracking and disturbance rejection. Within a certain range, desired axial forces and interface temperatures are achieved by automatically adjusting the spindle speed and the vertical tool position at the same time. The axial force and interface temperature is maintained during both thermal and geometric disturbances and thus weld quality can be maintained for a variety of conditions in which each control strategy applied independently could fail.
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Willems, Herbert, Hans Petter Bjørgen, Thor-Ståle Kristiansen, and Guus Wieme. "Qualification of a Combined Ultrasonic Inspection Tool for Detection and Sizing of Circumferential Weld Cracks in Offshore Pipelines." In 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/ipc2014-33537.
Повний текст джерелаАнотація:
The target of inline crack inspection is normally related to the detection of axial cracks (weld cracks, SCC etc.) as axial cracks are usually expected under typical loading conditions in pressurized pipe. Ultrasonic crack inspection tools for this type of cracks have been available for over 20 years and have become a standard application in the ILI business. However, under certain conditions circumferential cracking may occur and the inspection technique needs to be modified accordingly. Especially under offshore conditions with limited pipeline accessibility not only the early detection of crack-like defects is required but also a precise depth sizing is important in order to minimize the risk of crack-related pipeline failure. In order to ensure a high probability of detection together with state-of-the-art depth sizing, a 10″ inline inspection tool was developed for the detection of circumferentially orientated weld cracks. The tool combines the advantages of the pulse-echo technique on the detection side with the excellent capabilities of the TOFD (time-of-flight-diffraction) technique for accurate sizing. Both techniques are implemented into a tethered tool where the pulse-echo unit serves for fast screening while the relatively slow TOFD-unit is used for sizing of any detected crack-like features. In order to qualify the new tool for a special offshore application (inspection of circumferential cracking at welded anode pads) extensive testing was performed using a 10″ test pipeline prepared by Statoil. The test line contained 64 artificial weld defects for reference purposes as well as an unknown number of fatigue cracks in the weld area which were generated by fatigue testing of the corresponding pipes. The tests were full blind tests with no advance knowledge on locations and sizes of the cracks. The sizes of the fatigue cracks (length, depth) were determined by destructive examinations carried out after inline testing. The subsequent comparison of the destructive results with the non-destructive results showed that the specification of the tool with regard to detection and sizing was fully met. In the paper, the inspection concept and the setup of the new tool are described, and the results of the qualification tests are presented.
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Sanli, T. Volkan, Ercan Gürses, Demirkan Çöker, and Altan Kayran. "Development of Artificial Neural Network Based Design Tool for Aircraft Engine Bolted Flange Connection Subject to Combined Axial and Moment Load." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70448.
Повний текст джерелаАнотація:
Bolted flange connections are one of the most commonly used joint types in aircraft structures. Typically, bolted flange connections are used in aircraft engines. The main duty of a bolted flange connection in an aircraft engine is to serve as the load transfer interface from one part of the engine to the other part of the engine. In aircraft structures, weight is a very critical parameter which has to be minimized while having the required margin of safety for the structural integrity. Therefore, optimum design of the bolted flange connection is crucial to minimize the weight. In the preliminary design stage of the bolted flange connection, many repetitive analyses have to be made in order to decide on the optimum design parameters of the bolted flange connection. Two main methods used for analyzing bolted flange connections are the hand calculations based on simplified approaches and finite element analysis (FEA). While hand calculations lack achieving optimum weight as they tend to give over safe results, finite element analysis is computationally expensive because of the non-linear feature of the problem due to contact definitions between the mating parts. In this study, a fast but very accurate design tool based on artificial neural network (ANN) is developed for the cylindrical bolted flange connection of a typical aircraft engine under combined axial and bending moment load. ANN uses the FEA database generated by taking permutations of the parametric design variables of the bolted flange connection. The selected parameters are the number of bolts, the bolt size, the flange thickness, the web thickness, the preload level of the bolt and the external combined loads of bending moment and axial force. The bolt reaction force and the average flange stress are taken as the output variables and the results of 12000 different finite element analyses are gathered to form a database for the training of the ANN. Results of the trained ANN are then compared with the finite element analysis results and it is shown that an excellent agreement exists between the ANN and the non-linear finite element analysis results within the training limits of the artificial neural network. We believe that the ANN established can be a very robust and accurate approximate model replacing the non-linear finite element solver in the optimization of the bolted flange connection of the aircraft engine to achieve weight reduction.
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Choquette, Jeremie J., Sylvain Cornu, Mohamed ElSeify, and Raymond Karé. "Understanding Pipeline Strain Conditions: Case Studies Between ILI Axial and ILI Bending Measurement Techniques." In 2018 12th International Pipeline Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ipc2018-78577.
Повний текст джерелаАнотація:
In-Line inspection (ILI) tools consisting of combined sensor technologies provide a unique opportunity for operators to understand the conditions of pipelines. There is also an additional opportunity to contrast and validate individual sensing techniques against each other when their functionalities and purposes overlap. By using multi-technologies ILI measurements for strain, a pipeline operator can gain further insight into the pipeline strain behavior at any point along the length of the inspection. This paper establishes the relationship between ILI axial strain measurement tool data and conventional geometric strain data obtained from inertial measurement unit (IMU) based on data collected during in-service inspection of a 12″ liquid pipeline. Within any pipeline section, the tool configuration with circumferentially spaced strain sensors allows the use of appropriate analysis techniques to decompose the longitudinal strain into its primary components (axial, bending and out of roundness). The axial strain measurement tool sensing system provides an indirect measurement of bending strain that can be compared to the geometric measurement of bending strain determined from the pipeline trajectory as determined from the IMU analysis. Flexural bending strain resulting from horizontal directional drilling (HDD) is investigated in this paper. Convergences and divergences between the measurement techniques are presented. Data available from different strain technologies mounted on ILI tools offers an opportunity to conduct a comparative study and to provide a better understanding of a pipeline’s strain condition. This paper will present the framework for understanding the different strain measurement technologies and an investigation into the pipeline prior strain history (effects from fabrication, hydrostatic testing and external loads) and their corresponding impact on the material state at the time of inspection.
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Hirschmann, A., M. Casey, and M. Montgomery. "A Zonal Calculation Method for Axial Gas Turbine Diffusers." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94117.
Повний текст джерелаАнотація:
The axial exhaust downstream of a gas turbine in a combined cycle plant includes an annular diffuser with struts and a closed hub carrying the turbine rotor bearing. Flow separation occurs at the blunt end of the hub and can also occur on the casing wall and on the struts. A zonal method for the computation of the flow in such diffusers is described. A throughflow code is used for the axisymmetric core flow, a lag-entrainment-integral-method for the blockage of the boundary layers and the wake of the hub. For cases with separated flow a semi-inverse procedure for the coupling is needed. Additional empirical information is required such as a term related to the closing of the hub separation, correlations for the skin friction and the form factor and an estimate of the losses based on a dissipation coefficient. Experimental data from annular diffuser test cases from the literature and from a typical turbine diffuser are used to validate the method. The location of the separation in the diffuser is calculated correctly and the prediction of the pressure recovery is promising, suggesting that this is a useful tool for the preliminary design of highly loaded annular configurations.
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Tu, Qiuye, Xianzhong Huang, Yang Shi, Kun Yang, and Li Zhou. "An Optimizing Method to Balance Aerodynamic Loading for Gas Turbine Engine Preliminary Design." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94044.
Повний текст джерелаАнотація:
This paper presents a method to balance aerodynamic loading by optimizing the combined efficiencies of co-axial compressors and turbines for engine preliminary design. Relationships between the aerodynamic and dimensional parameters for co-axial compressors and turbines were set up by nonlinear equations. And the boundary conditions of the equations are thermodynamic parameters and Smith Charts of compressors and turbines. The process of the method includes the initial value guess, reference point determination and aerodynamic optimization. The first step solves approximate stage numbers for co-axial compressors and turbines, and other initial values used in the second step. In the second step, an appropriate solution of the equations determines a reference point on the Smith Chart. The first step is required for a better convergence in the second step due to the nature of the Newton-Raphson solver. In the third step, the combined efficiencies of co-axial compressors and turbines are optimized under the specified constraints. An optimizing tool was developed based on the proposed method. An example of a core engine was analyzed by using this tool. The results showed the reliability and high fidelity of the method.
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Younus, Ahmed, Haider Hekmet, and Abeer Al-Shami. "Torque – Twist Behavior of RC Columns Retrofitted with GFRP Laminates Under Combined Torque & Axial Loads: A Parametric Study." In INTERNATIONAL CONFERENCE ON ARCHITECTURAL AND CIVIL ENGINEERING 2020. Cihan University-Erbil, 2021. http://dx.doi.org/10.24086/aces2020/paper.351.
Повний текст джерелаАнотація:
As one of the most important topics that have not been sufficiently studied to investigate the structural behavior of concrete columns is the mechanical properties of concrete members resulting from the torsional effects that caused mainly from the exposure of buildings to earthquakes, especially the cracks resulting in the structural members and overall torque-twist behavior. However, concrete columns are elements that are difficult to replace when exposed to earthquakes, so the role of developing applicable and useful methods for maintaining and strengthening columns has emerged after exposure to torsion. FRP laminates like CFRP and GFRP are one of the most successful and widespread of these methods nowadays. To achieve the goal of this paper, a finite element 3D model suitable for analyzing square RC columns strengthened with GFRP under combined torsional moment and axial loads has been adopted and a reasonable method for calculating angles of twist for square concrete columns using the finite element method has been developed. [ANSYS] software as a useful tool is used to solve the problem and to predict the Torque – Twist relationships of the columns under investigation. The results are compared and verified with an experimental study and the numerical results showed acceptable agreement with the experimental results. Several important parameters affecting the torsional capacity of square columns strengthened with GFRP and subjected to combined torque & axial load are studied in parametric study. These parameters include, GFRP distribution, GFRP thickness, and GFRP schemes (orientation). The results showed the efficiency of finite element software to estimate the torque twist relationships after developing modified formulas to calculate the angles of twist, on the other hand, the fixing of GFRP sheets in 45 degree opposite to the cracks orientation is the best way to increase the torsional capacity of RC columns.
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Seto, Laura, Thomas Hennig, and Thorsten Sickinger. "Development and Validation of a Combined UM/UC In-Line Inspection Tool for a 36/48″ Pipeline System." In 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/ipc2014-33296.
Повний текст джерелаАнотація:
Within the global integrity program of Enbridge a 36/48″ dual diameter pipeline with a total length of approximately1800 km needs to be inspected for wall thickness and axial cracking in a single run. The line consists of 29 sections, each of an approximate length of 60 km. A challenging characteristic of the line is the 36″ launcher and 48″ receiver in 28 of the sections. Thus, the resulting outer diameter change is about 305mm or 33%. From an intelligent inspection perspective additional boundary conditions had to be taken into account, e.g. tight 1.5D bends and a medium with high attenuation — which is especially important for the crack inspection technology. Pipeline operator and in-line inspection (ILI) vendor agreed on an extensive testing and qualification program including small scale tests (200 anomalies) and field verifications. Therefore, the operator witnessed pull tests of the 36/48″ UCM tool at the test facility in Stutensee, Germany during the development phase in 2012. The first inspection in an operating pipeline system, as part of the validation process, was made in July 2012 after only 12 months of development and construction. Some shortcomings of the tool concept were observed within the first inspection, which led to an unsuccessful run. Both parties worked closely together to implement some modifications to the tool. In 2012 and 2013 the modified tool was run a total of 29 times, with further runs planned for 2014. The first excavations have been completed, and show an excellent correlation between tool performance and specification. Further excavations are scheduled for early 2014 that will provide additional feedback to assess and validate the tool. At the time of writing, the 36/48″ tool is fully validated for metal loss defects, and validated for cracks only up to 2.5mm in depth. The authors will present in detail the development of the tool and the definition of the validation process. Mechanical and operational conditions are discussed. The predefined validation process of the tool is briefly presented and the test results are discussed in detail. Furthermore, field verification results are presented.
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Chen, Tie, John Rogerson, and Kush Patel. "Effects of Both Axial Gap and Blade Count Ratio on the Forced Response of a Steam Turbine Stage." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94714.
Повний текст джерелаАнотація:
Rotating blades of steam turbines are subjected to unsteady forces due to the presence of both wake and potential field from the adjacent stationary blade rows. The combined effects of both axial gap and blade count ratio on the unsteady forces have been demonstrated on a steam turbine stage. This study shows their effects on the forced response. Further investigations show their effects on stimulus, aero damping and frequency shift. This study uses a one-way coupling dynamic stress prediction tool, which integrates an in-house Computational Fluid Dynamic solver TF3D-VIB with a commercial Finite Element solver ABAQUS.