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Статті в журналах з теми "Clamping structure"
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Chou, Bai Ge, Heng Zhi Cai, Gang Zhou, Ya Jun Zhang, and Jian Zhuang. "Design and Motion Simulation of the Clamping Mechanism of Micro-Structure Injection Molding Machine." Advanced Materials Research 945-949 (June 2014): 670–75. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.670.
Повний текст джерелаАнотація:
Micro-structure injection molding machine is mainly used for processing the plastic products in micron-size or with micro-structures. This paper focuses on the design and control of the clamping mechanism of micro-structure injection molding machine. Firstly, the deformation of the clamping mechanism was analyzed. The simulation results shows that the clamping force is 5.0051×105N, and it’s bigger than the design value 500kN. Secondly, the kinetic characteristic of the clamping was simulated by ADAMS software. The curves of the displacement, velocity, clamping force of moving platen were analyzed. Thirdly, the control model of clamping mechanism was established. And the LQR controller was designed and simulated by Matlab. The rise time is 0.010s, the settling time is 0.026s and the steady-state is 0.307m.
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Xu, Xun, Haidong Yu, Yunyong Li, and Xinmin Lai. "Compliant assembly deviation analysis of large-scale thin-walled structures in different clamping schemes via ANCF." Assembly Automation 40, no. 2 (November 3, 2019): 305–17. http://dx.doi.org/10.1108/aa-01-2019-0018.
Повний текст джерелаАнотація:
Purpose The structure stiffness is greatly affected by the fixture constraints during assembly due to the flexibility of large-scale thin-walled structures. The compliant deformation of structures is usually not consistent for the non-uniform stiffness in various clamping schemes. The purpose of this paper is to investigate the correlation between the assembly quality and the clamping schemes of structures with various initial deviations and geometrical parameters, which is based on the proposed irregular quadrilateral plate element via absolute nodal coordinate formulation (ANCF). Design/methodology/approach Two typical clamping schemes are specified for the large-scale thin-walled structures. Two typical deviation modes are defined in both free and clamping states in the corresponding clamping schemes. The new irregular quadrilateral plate element via ANCF is validated to analyze the compliant deformation of assembled structures. The quasi-static force equilibrium equations are extended considering the factors of clamping constraints and geometric deviations. Findings The initial deviations and geometrical parameters strongly affect the assembly deviations of structures in two clamping schemes. The variation tendencies of assembly deviations are demonstrated in details with the circumferential clamping position and axial clamping position in two clamping schemes, providing guidance to optimize the fixture configuration. The assembly quality of structures with deviations can be improved by configuration synthesis of the clamping schemes. Originality/value Typical over-constraint clamping schemes and deviation modes in clamping states are defined for large-scale thin-walled structures. The plate element via ANCF is extended to analyze the assembly deviations of thin-walled structures in various clamping schemes. Based on the proposed theoretical model, the effects of clamping schemes and initial deviations on the deformation and assembly deviation propagation of structures are investigated.
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Van Doan, Do, Adam Szeleziński, Lech Murawski, and Adam Muc. "Modelling Method of Dynamic Characteristics of Marine Thin-Walled Structure." Journal of KONES 26, no. 4 (December 1, 2019): 39–46. http://dx.doi.org/10.2478/kones-2019-0087.
Повний текст джерелаАнотація:
AbstractThin-walled structures are very popular in industries, especially in the field of shipbuilding. There are many types of equipment and structures of ships, which are made up of thin-walled structures such as hull, deck and superstructure. Therefore, the analysis and understanding of the static and dynamic characteristics of a thin-walled structure are very important. In this article, we focus on vibration analysis of a typical thin-walled structure-rectangular plate, a basic structure of the hull. Vibration analysis of a rectangular thin plate is conducted by two methods: numerical modelling method of the finite element on Patran-Nastran software platform and experimental method implemented in the laboratory of Gdynia Maritime University. Thin rectangular plate is fixed one end by four clamping plates and is modelled with finite elements and different meshing densities. The numerical model of thin rectangular plate is divided into four cases. Case 1, thin rectangular plate, and clamping plates are modelled with two-dimensional elements. Case 2, the rectangular thin plate is modelled with two-dimensional elements; the clamping plates are modelled with three-dimensional elements. Case 3, both the rectangular thin plate and clamping plates are modelled with three-dimensional elements. Case 4, the rectangular thin plate, and clamping plates are modelled with three-dimensional elements with larger mesh density to increase the accuracy of the calculation results. After that, the results of vibration analysis according to the numerical modelling method on Patran-Nastran software platform for these cases were compared with the measurement results. From there, assess the accuracy of analysis results of selected numerical model methods and the ability to widely apply this numerical model method to other marine structures.
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Deng, Jie, Shijing Zhang, Yiqing Li, Xuefeng Ma, Xiang Gao, Hui Xie, and Yingxiang Liu. "Development and experiment evaluation of a compact inchworm piezoelectric actuator using three-jaw type clamping mechanism." Smart Materials and Structures 31, no. 4 (March 11, 2022): 045020. http://dx.doi.org/10.1088/1361-665x/ac59da.
Повний текст джерелаАнотація:
Abstract A compact inchworm piezoelectric actuator using three-jaw type clamping mechanism is developed in this study. Different from the previous inchworm piezoelectric actuators constructed with guiding structures, the proposed actuator can drive an output shaft to realize linear motion without other auxiliary structures based on the automatic centering and guidance functions of the designed three-jaw type clamping mechanism, and a compact structure is obtained. The configuration of the actuator is presented to describe the operating principle in detail. Then the structures of the clamping and actuating units are designed by the assistance of finite element simulations. A prototype is fabricated and a compact structure is achieved with outer diameter of 34 mm and length of 40 mm. The experiments are performed to investigate the characteristics, a maximum speed of 155.5 μm s−1 and a thrust force of 12.3 N are achieved. The experimental results confirm that the proposed inchworm actuator can achieve a compact structure by adopting the designed three-jaw type clamping mechanisms, it has great potential in integration with precision equipment, which is conductive to apply in the fields of biological manipulation robots and aerospace devices.
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Srikanta Murthy, Avinash, Norhafiz Azis, Salem Al-Ameri, Mohd Mohd Yousof, Jasronita Jasni, and Mohd Talib. "Investigation of the Effect of Winding Clamping Structure on Frequency Response Signature of 11 kV Distribution Transformer." Energies 11, no. 9 (September 2, 2018): 2307. http://dx.doi.org/10.3390/en11092307.
Повний текст джерелаАнотація:
This paper presents an investigation on the sensitivity of frequency response of a 500 kVA, 11/0.433 kV distribution transformer with and without the presence of a winding clamping structure. Frequency response analysis (FRA) measurements of multiple test configurations were carried out with and without the presence of a winding clamping structure. Statistical analyses based on Pearson’s correlation coefficient (PCC), Spearman’s correlation coefficient (SCC), Kendall’s correlation coefficient (KCC), cross-correlation coefficient (CCF), root mean square error (RMSE), absolute sum of logarithmic error (ASLE), hypothesis test (F-test) and relative factor (RF) were applied to determine the effect of the winding clamping structure. It was found that the removal of the winding clamping structure has an impact on the frequency response signature at the frequency less than 2 kHz during offline measurement. It was found that ASLE and F-test are suitable methods that can be used to indicate the variation of frequency response caused by clamping structure removal of the distribution transformer under study.
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Baek, Soo-Whang, and Keun-Young Yoon. "Improving the Hybrid Electromagnetic Clamping System by Reducing the Leakage Flux and Enhancing the Effective Flux." Energies 12, no. 19 (October 1, 2019): 3762. http://dx.doi.org/10.3390/en12193762.
Повний текст джерелаАнотація:
In most industrial fields, mechanical clamping methods are traditionally used to transport heavy loads such as steel structures by fastening the load using bolts and nuts. However, this method can lead to industrial accidents during load transfer and does not consider the weight of the load. Recently, permanent magnet clamping methods have been proposed to prevent such accidents; for example, hybrid electromagnetic clamping systems (H-EMCSs), which combine permanent magnets and electromagnets and can adjust the clamping force according to the load weight. However, few studies have attempted to improve the electromagnetic structure and effective magnetic flux of H-EMCS. Specifically, H-EMCSs control the clamping force using several hybrid electromagnetic modules (H-EMMs); however, the leakage magnetic flux increases with an increasing number of H-EMMs. Therefore, the clamping force should be improved to avoid increasing the leakage magnetic flux. In this study, we propose a novel H-EMM structure and improve its electromagnetic force characteristics by changing the core shape and dimension effect in order to reduce the leakage flux and maximize the effective magnetic flux. Furthermore, we verify the improved electromagnetic force properties by experimentally validating the proposed model. This research can improve the safe and effective transfer of industrial loads.
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Sutcliffe, Brian T., and R. Guy Woolley. "Molecular structure calculations without clamping the nuclei." Physical Chemistry Chemical Physics 7, no. 21 (2005): 3664. http://dx.doi.org/10.1039/b509723c.
Повний текст джерела
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Liu, Ming Zhu, Long Bin, and Ke Kuan Wang. "The Clamping Force of a Deepwater Flange Connecting Tool and the Bearing Capacity of the Pipeline." Advanced Materials Research 466-467 (February 2012): 799–803. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.799.
Повний текст джерелаАнотація:
A clamping mechanism for use in relatively the bearing capacity of the pipneline is described. The force analysis of the clamping mechanism is performed according to the operation of the deepwater flange connecting tool, and the clamping force of the clamping mechanism is determined according to the ultimate working condition of the deepwater flange connecting tool. At the same time, the strength and stability of the pipeline are also calculated using the thin-wall strength theory, and it is proved that the clamping force of the clamping is appropriate. The findings provide a theoretical basis for structure design and optimization of the clamping of the deepwater flange connecting tool.
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He, Qin, Qian Su, Ming Qin Zhang, Rui Jun Zhang, and Sheng Qu. "The Innovative Design of New-Style Clamping Automobile Tires Conveyance Based on TRIZ." Advanced Materials Research 335-336 (September 2011): 69–73. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.69.
Повний текст джерелаАнотація:
Abstract. This part analyzed clamping automobile tires conveyance’s research situation, summarized its failure problem and occurrence cause, and selected the important failure problem by RPN method; and then solved creatively clamping lever roller’s wear, clamping lever’s excessive damage owing to rise and decrease slightly, the automobile conveyance’s excessive damage owing to the car’s rollover and clamping lever’s bearing load unevenly; in the end, proposed the conceptual design of new-style clamping vertically automobile tires conveyance. The conveyance have a simple structure, decrease the clamping lever’s and car tire’s wear, avoid cantilever phenomenon owing to rise and decrease slightly, decrease the clamping lever’s strength and stiffness.
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Wang, Wenming, Shimin Zhang, Deguo Wang, Li Lin, Xiaoxiao Zhu, and Yingchun Chen. "Synchronous clamping control of marine umbilical cable tensioner." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 10 (December 14, 2012): 2328–36. http://dx.doi.org/10.1177/0954406212471104.
Повний текст джерелаАнотація:
The umbilical cable tensioner is a core component of deep-water oil and gas development, and it can lay and recover the umbilical cables to ensure the transmission of communication signals, electric signals or liquid injection. The displacements of tensioner’s clamping hydraulic cylinders, which are not synchronized as the nonlinear electro-hydraulic control system, results in the occurrence of the crawler mechanism’s stuck phenomenon or cause umbilical cable deformation or even cause damage by the extrusion in the umbilical cable’s clamping process. To ensure synchronous clamping, the structure scheme of umbilical cable tensioner, crawler mechanism, clamping mechanism and the hydraulic system of synchronous clamping control is designed in this study. This article also analyzes the function of structure parameters and hydraulic cylinders’ displacement, speed and acceleration, and builds the synchronous clamping mechanical model to reveal crawler mechanism’ clamping law. The study proposes the control strategy including the fast moving stage, the working stage and the pressuring stage based on proportional–integral–derivative control, and analyzes the characteristics of synchronous clamping control by building the synchronous clamping experimental platform in the lab environment. The experimental data shows that the tensioner’s hydraulic cylinders have excellent synchronous clamping performance and the theoretical analysis is feasible. The research has important guiding significance for the tensioner design, and provides theoretical support for the laying of the deep-sea umbilical cables.
Дисертації з теми "Clamping structure"
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Souza, Alexandre Pacheco de. "Simulação numérica da clipagem arterial utilizando interação fluido-estrutura através do método de elementos finitos /." Ilha Solteira : [s.n.], 2010. http://hdl.handle.net/11449/94511.
Повний текст джерелаАнотація:
Resumo: A Bioengenharia está cada vez mais presente em todo o mundo. Ela estuda problemas que tenham dificuldades em análise experimental em laboratório. Este trabalho determina a força exercida por um grampo cirúrgico quando o mesmo é aplicado em determinada região Arterial a fim de ocluir o fluxo sanguíneo. Esta força foi medida utilizado uma simulação computacional. Duas áreas foram consideradas: uma representando a parede Arterial e a outra, representando o sangue. Esta simulação realizou-se em regime de acoplamento entre os dois domínios utilizando interação fluido-estrutura. A modelagem foi feita considerando dois domínios distintos: estrutura e fluido. O fluido é considerado incompressível e Newtoniano e é governado pelas equações de Navier-Stokes. As paredes da estrutura são modeladas a partir da Lei de Hooke. A solução numérica calcula: os campos de pressão e velocidade do fluido, campo de deslocamento da estrutura e a força aplicada pelo grampo para que ocorra a obstrução do fluxo sanguíneo naquele localAbstract: The Bioengineering is increasingly present in the fields of scientific research throughout the world. It studies problems that have difficulty in experimental analysis in the laboratory. This work measures the force exerted by a surgical clip when it is applied in a given region Arterial to occlude blood flow. This force was measured using a computational simulation. It was modeled two cylinders, one representing the arterial wall and the other in this first, representing the blood. This simulation was carried out under the coupling between the two domains using fluid-structure interaction. Modeling was done in three-dimensions, considering two distinct areas: one as structure and other as fluid. The fluid was considered incompressible and Newtonian. It is governed by the Navier-Stokes equations. The walls of the structure were modeled from the Hooke's Law. The numerical solution calculate: pressure fields, and fluid velocity, displacement field of the structure and the force applied by the clip for the occurrence of obstruction of blood flow there
Orientador: Aparecido Carlos Gonçalves
Coorientador: Marcio Antonio Bazani
Banca: Gilberto Pechoto de Melo
Banca: Edson Antonio Capello Sousa
Mestre
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Ziegenbein, Jordan Michael. "Magnetic clamping structures for the consolidation of composite laminates." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43588.
Повний текст джерелаАнотація:
Vacuum bags in conjunction with autoclaves are currently employed to generate the consolidation pressures and temperatures required to manufacture aerospace level composites. As the scale of continuous fiber composite structures increases autoclaving becomes prohibitively expensive or impossible. The objective of this work is to develop flexible magnetic clamping structures to increase the consolidation pressure in conventional vacuum bagging of composite laminates, thereby obviating the need for an autoclave. A ferromagnetic rubber, which consists of rubber filled with iron, is being developed as a conformable and reusable vacuum bag that provides increased consolidation through attractive forces produced by electromagnets. Experiments and finite element modeling indicate that consolidation pressure in the range of 100 kPa can be generated by such a device with realistic power requirements. The effects of the magnetic clamping device process parameters on the consolidation pressure magnitude are modeled and characterized. In addition, a method for the efficient design of the magnetic clamping device is developed.
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Souza, Alexandre Pacheco de [UNESP]. "Simulação numérica da clipagem arterial utilizando interação fluido-estrutura através do método de elementos finitos." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/94511.
Повний текст джерелаАнотація:
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souza_ap_me_ilha.pdf: 2793163 bytes, checksum: cac24da914ff0917c1d9438da0bc50f8 (MD5)A Bioengenharia está cada vez mais presente em todo o mundo. Ela estuda problemas que tenham dificuldades em análise experimental em laboratório. Este trabalho determina a força exercida por um grampo cirúrgico quando o mesmo é aplicado em determinada região Arterial a fim de ocluir o fluxo sanguíneo. Esta força foi medida utilizado uma simulação computacional. Duas áreas foram consideradas: uma representando a parede Arterial e a outra, representando o sangue. Esta simulação realizou-se em regime de acoplamento entre os dois domínios utilizando interação fluido-estrutura. A modelagem foi feita considerando dois domínios distintos: estrutura e fluido. O fluido é considerado incompressível e Newtoniano e é governado pelas equações de Navier-Stokes. As paredes da estrutura são modeladas a partir da Lei de Hooke. A solução numérica calcula: os campos de pressão e velocidade do fluido, campo de deslocamento da estrutura e a força aplicada pelo grampo para que ocorra a obstrução do fluxo sanguíneo naquele local
The Bioengineering is increasingly present in the fields of scientific research throughout the world. It studies problems that have difficulty in experimental analysis in the laboratory. This work measures the force exerted by a surgical clip when it is applied in a given region Arterial to occlude blood flow. This force was measured using a computational simulation. It was modeled two cylinders, one representing the arterial wall and the other in this first, representing the blood. This simulation was carried out under the coupling between the two domains using fluid-structure interaction. Modeling was done in three-dimensions, considering two distinct areas: one as structure and other as fluid. The fluid was considered incompressible and Newtonian. It is governed by the Navier-Stokes equations. The walls of the structure were modeled from the Hooke's Law. The numerical solution calculate: pressure fields, and fluid velocity, displacement field of the structure and the force applied by the clip for the occurrence of obstruction of blood flow there
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Никеруй, Юрій Степанович. "Обґрунтування параметрів канатної системи малих складських приміщень для переміщення сільськогосподарських продуктів у тарі". Diss., Тернопільський національний технічний університет ім. Івана Пулюя, 2021. http://elartu.tntu.edu.ua/handle/lib/35189.
Повний текст джерелаАнотація:
Дисертаційна робота присвячена підвищенню експлуатаційних
показників канатних систем для завантаження малих складських приміщень
сільськогосподарськими продуктами у тарі шляхом розроблення нових
конструкцій механізмів та їх окремих елементів з обґрунтуванням раціональних
параметрів.The thesis under discussion is devoted to the increase of rope system performance for small warehouses loading with agricultural products in containers by means of the development of new design of mechanisms and their separate parts including the substantiation of the most efficient parameters.
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Suntharavadivel, Thuraichamy Guganesan. "Behaviour of shear damaged reinforced concrete beams strengthened with external post-tensioning and clamping." University of Southern Queensland, Faculty of Engineering and Surveying, 2008. http://eprints.usq.edu.au/archive/00006254/.
Повний текст джерелаАнотація:
[Abstract]Over the last few decades, there has been a rapid increase in the volume and weight of heavy vehicles using national road networks. More than half of the bridges around the world are over forty years old. The deterioration of these existing bridges due to increased traffic loading, progressive structural aging, and reinforcement corrosion from severe environmental conditions has become a major problem in most countries. Several techniques have been used to strengthen these structures around the world. External post-tensioning is one of the widely used strengthening techniques in many countries due to its advantages over other methods. Furthermore, flexural strengthening using external post-tensioning has become a well established technique over the past few decades. However, when external post-tensioning is used to strengthen shear damaged reinforced concrete members, unlike flexural damage, the efficiency is significantly reduced by existing shear cracks.This research study was carried out to investigate the behaviour of reinforced concrete beams with existing shear cracks when strengthened by external means. The study consists of two parts: experimental investigations of reinforced concrete beams with different parameters and numerical analysis of reinforced concrete beams usingsimplified theoretical formulation and finite element modelling.To study the behaviour of shear damaged concrete beams, two different strengthening techniques, namely external post-tensioning and external clamping, were used. In addition to the strengthening, the effect of cracks on the behaviour of reinforced concrete beams was investigated by repairing such cracks using epoxy resin injection. Experimental results showed that existing shear cracks have a substantial effect on the member capacity when strengthened by external posttensioning. Although there are concerns about the practical applications of externalclamping, the experimental results suggest that external clamping could be a more effective technique than external post-tensioning to reduce the effect of existing shear cracks on the behaviour of concrete beams. Furthermore, proper repair of the shear cracks could significantly reduce their impact.In the numerical analysis, a simplified mathematical approach was developed to estimate the capacity of shear damaged reinforced concrete beam by expanding themodified compression field theory (MCFT). In addition to the simplified theoretical formulation, a finite element model was developed using the commercial finite element package, Abaqus. Comparison between the predicted behaviour using finite element analysis (FEA) and the experimental data illustrated that the developed finite element model could be used as a reliable tool to estimate the capacity of shear damaged reinforced concrete beams. A parametric study was conducted to investigate the effect of different parameters such as concrete strength, amount of shear reinforcement and crack width, using the developed finite element model. From the numerical study, it was concluded that the simplified approach developedin this study can be used as a reliable and conservative technique to predict the member capacity of a cracked reinforced concrete beam strengthened by external means. Furthermore, the parametric study showed that crack width is the most sensitive parameter that affects the capacity of a cracked beam strengthened by external post-tensioning.Based on this research study it can be concluded that existing shear cracks have a substantial effect on the behaviour of reinforced concrete beams strengthened byexternal post-tensioning. The simplified mathematical approach developed in this study can be used to estimate the capacity of such beams.
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Barnett, Tobias C. "Assessment of clamping behaviour of a newly developed blind bolt, and an investigation into its performance in the tension region of moment resisting connections using open and hollow sections." Thesis, Nottingham Trent University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366362.
Повний текст джерела
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Лазарєв, Іван Вікторович, Иван Викторович Лазарев та Ivan V. Lazariev. "Розробка та вдосконалення методів розрахунку міцності елементів конструкції силових трансформаторів". Thesis, Запорізький національний технічний університет, 2016. http://eir.zntu.edu.ua/handle/123456789/887.
Повний текст джерелаАнотація:
Лазарєв, І.В. Розробка та вдосконалення методів розрахунку міцності елементів конструкції силових трансформаторів [Текст]: дис. … канд. техн. наук: 01.02.04 /Лазарєв Іван Вікторович. – Запоріжжя, 2016. – 243 с.UK: Створено узагальнені методи визначення критичних напружень радіальної стійкості та розрахунку на міцність при дії радіальних і осьових сил гнучкого кругового кільця круглого та прямокутного з заокругленнями кутів перерізу, яке моделює провідники обмоток трансформаторів. Визначено осьові зусилля в деформівних елементах механічної системи, утвореної двома простими осциляторами з розташованими на одній осі безінерційними пружинами і твердими тілами, звязаними паралельними стержнями, на які діють відмінні у часі зосереджені аперіодичні осьові сили, що виникають при коротких замиканнях в обмотках різних фаз трансформатора, розміщених на одному стрижні магнітної системи. Розроблено методи визначення осьових зусиль в деформівних компонентах складної механічної системи, яку утворіють обмотки та конструкція їх пресування, при дії сил, що виникають у процесі виготовлення, транспортування, та експлуатації трансформаторів. EN: Transformer winding conductors were simulated by a flexible circular ring with round and rectangular (filleted and non-filleted) cross-section. For such a ring there were created generalised methods for determining critical stresses of radial stability and for strength analysis under the action of radial an axial forces. There were determined axial internal forces in deformable elements of the mechanical system comprising two simple oscillators with inertialess springs and rigid bodies located on the same axis and connected by parallel rods with the latter being loaded by concentrated aperiodic axial forces that change in time by distinct time functions and originate in windings of different transformer phases installed on the same magnetic system leg. There were developed methods for determining axial internal forces in deformable components of a complex mechanical system comprising windings and their clamping structure under the action of forces occurring in the process of transformer manufacture, shipment and in service. RU: Разработаны обобщенные методы определения критических напряжений радиальной устойчивости и расчета прочности при действии радиальных и осевых сил гибкого кругового кольца круглого и прямоугольного с закруглениями углов сечения, которое моделирует проводники обмоток трансформаторов. Определены осевые усилия в деформируемых элементах механической системы, образованной двумя простыми осцилляторами с расположенными на одной оси безынерционными пружинами и твердыми телами, связанными параллельными стержнями, на которые действуют сосредоточенные апериодические осевые силы, которые изменяются во времени по различающимся функциям, и возникают в обмотках разных фаз трансформатора, расположенных на одном стержне магнитной системы. Разработаны методы определения осевых усилий в деформируемых компонентах сложной механической системы, которую образуют обмотки и конструкция для их прессовки, при действии сил, которые возникают в процессе изготовления, транспортирования и эксплуатации трансформаторов.
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LI, TING-HUNG, and 李定鴻. "The Study of L-band Erbium-Doped Fiber Gain Clamping Amplifier Structure and Best Parameters." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/26190722264341803713.
Повний текст джерелаАнотація:
碩士國立東華大學
電機工程學系
99
In this paper, we set up a ring cavity with a fiber Bragg grating (FBG) or C/L coupler and circulator to construct a L-band erbium-doped fiber gain clamping amplifier (EDFGCA). The performance of EDFGCA is demonstrated by considering the different FBG wavelength, pumping power, single or WDM input signal, and single or two stage structure. When the input is multi-signal, the best experimental result of single stage structure is to use 1571nm FBG and bi-direction pumping power of 200+200mW, the clamping gain can achieve 10.84dB with gain variation below 0.3dB for input signal power from -20dBm to -5dBm. When the input signal is single channel, the best experimental result of single stage structure is to use 1561nm FBG and bi-direction pumping power of 200+200mW, the clamping gain can achieve 15.44dB with gain variation below 0.3dB for input signal power from -20dBm to 2dBm. By using bi-direction pumping power of 100+100mW, the clamping gain can achieve 15.36dB with gain variation below 0.3dB for input signal power from -20dBm to -4dBm. Comparing the results of two different pump power, clamping gain is almost the same, but the clamping range is large in the high pumping power case. By comparing the experimental results of input multi-signal and single-signal, we show that the gain clamped performance is better with bi-direction pump power of 200 +200mW, but the FBG wavelength of best gain-clamped performance is different. This is because the total input signal power is different. The large input power of multi-signal needs a long wavelength FBG of better gain clamping effect. By Comparing the experimental results of single-stage and two-stage L-band EDFGCA structure with the same total pump power, single-stage gain clamping performance is better than that of two-stage structure, because the second stage of two stage structure can not generate enough clamping lasing power to clamping the input signal of first stage. Our L-band EDFGCA can operate from 1560~1615nm signal wavelength and covers the entire L-band. The clamped gain can achieve 15.44dB with gain variation below 0.3dB for input signal power from -20dBm to 2dBm. The proposed L-band EDFGCA can be used to amplify the entire L-band signal, and provide a stable gain without variation.
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Huang, Yu-Ya, and 黃鈺雅. "The Structural Analysis for Clamping Mechanism of Injection Molding Machine." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/8w732r.
Повний текст джерелаАнотація:
碩士國立高雄第一科技大學
機械與自動化工程系碩士專班
105
In this study, stress analysis of fixed and movable die mold walls in the clamping unit of an injection molding machine was performed using the commercial software Pro/ENGINEER (Pro/Mechanica module). The surface strains were first obtained experimentally, using the strain gauge measurement system. These values were subsequently used for refining the boundary conditions of the numerical model to improve the simulation accuracy. Such an approach is expected to yield accurate prediction of the mold wall deformation in an actual system with new design parameters. Analyses demonstrate that for both fixed and movable mold walls, the error between the simulation results and experimental data remains within 0.01 mm, i.e., within the machining tolerance. This suggests that the accuracy of the current analysis using finite element method, developed for modeling the mold wall in the clamping unit of the injection molding machine, is within an acceptable level. The simulation analysis allows for better understanding of deformation of the system components. This reduces the number of physical tests in the design process and improves the quality of final products that eventually aid in reducing the production cost and time. The structural analysis of the mold wall was also conducted in this study. It is observed that using a movable mold wall leads to a 6% enhancement in stiffness and a 23% reduction in weight, while using a fixed mold wall leads to 7% enhancement in stiffness and 1% reduction in weight. These results indicate that the new design is effective in building a stronger and lighter mold structure that assist in achieving the design targets of safety improvement and cost reduction. Keywords: Strain gauge measurement, Structural analysis, Finite element method (FEM), Injection molding machine
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Liu，Chun-Hung and 劉俊宏. "Design of Deformable Clamping Structural for A 2-axis-head Brake." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/74016129182980308572.
Повний текст джерелаАнотація:
碩士國立中興大學
機械工程學系所
102
Five-axis CNC machining technologies with more two rolling axes than traditional three-axis can be applied to process high-precision compound cambers, as turbine blades or precision mold, etc. Five- axis machining technologies can manufacture products of complicated geometrical figure, so they own much more extensive ability of cutting processing. The research applies high twisting force five-axis processing, based on small section of rolling axis head (420x443mm). Its character is reducing interference of processing tub depth. However the function of B/C rolling axis clutch position is hard to reach the demand and the hydraulic tub must occupy most in narrow spaces. With creative disc brake expansion, two discs brake in frictional way within gaps of two discs and hydraulic pressure that produce disc clamps B/C axis angle in expanded deformation to reach exact brake orientation. ANSYS using optimization material Ni/Steel as the last election，The objective function defined by the results of B/C-axis disc''s thickness is 4mm/3mm，It''s expanded deformation disc space is 0.05mm；After getting the disc enduring load with the ANSYS component analysis，it brings forces to admit the deformation the working force or the designing gap needs. Using the formula to calculate clamping forces by testing machine and the inaccuracy precision of the disc expanded deformation achieves the function of clamping deformation matching number. The research successfully makes the disc expanded deformation achieved 0.05mm by testing 3 bar ; setting in the design of reserving 0.04~0.07mm space, and finally achieved 0.09mm by testing 30 bar. After testing the expanded deformation, the changing inaccuracy number of back is 0.002mm, very micro-deformation. Testing the hydraulic pressure of 20 bar by testing board, the controller displays the current value is greater than the standard of 39A, clamping until the system displays the overloading high temperature of 61A. To calculate the mechanism clamping of 20 bar in the forecast of brake expansion is 3590Nm, the clamping force can reach the clamping position in the range of 1.5 times. In the condition of 45~50 bar pressure, the frictional coefficient can be obtained 0.3 μ range. The data of experiments and calculating verification are the character of 5000Nm large machining technologies
Частини книг з теми "Clamping structure"
1
Chang, Wen-Tung, and Yao-Yu Fang. "Structural Synthesis of Ten-Link Type Double-Toggle Mold/Die Clamping Mechanisms." In Advances in Mechanism and Machine Science, 1461–70. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20131-9_144.
Повний текст джерела
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Fain, Gordon L. "Channels and electrical signals." In Sensory Transduction, 37–56. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198835028.003.0003.
Повний текст джерелаАнотація:
“Channels and electrical signals” is the third chapter of the book Sensory Transduction and reviews the structure and function of ion channels, the structure of channel pores, and mechanisms of gating. It introduces ionotropic receptor molecules, which are proteins that function as sensory receptors but are also ion channels, whose gating can produce changes in membrane conductance directly. It then uses the hair cell of the inner ear as an example to introduce the concepts of membrane potentials, the Nernst equation, ion homeostasis, the Goldman voltage equation, and driving force. A description of the technique of voltage clamping follows, together with the application of this technique to the hair cell to explain the method of measuring changes in channel gating and the ion selectivity of channel pores.
3
Chand Verma, Kuldeep, and Manpreet Singh. "Processing Techniques with Heating Conditions for Multiferroic Systems of BiFeO3, BaTiO3, PbTiO3, CaTiO3 Thin Films." In Thermoelectricity [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.101122.
Повний текст джерелаАнотація:
In this chapter, we have report a list of synthesis methods (including both synthesis steps & heating conditions) used for thin film fabrication of perovskite ABO3 (BiFeO3, BaTiO3, PbTiO3 and CaTiO3) based multiferroics (in both single-phase and composite materials). The processing of high quality multiferroic thin film have some features like epitaxial strain, physical phenomenon at atomic-level, interfacial coupling parameters to enhance device performance. Since these multiferroic thin films have ME properties such as electrical (dielectric, magnetoelectric coefficient & MC) and magnetic (ferromagnetic, magnetic susceptibility etc.) are heat sensitive, i.e. ME response at low as well as higher temperature might to enhance the device performance respect with long range ordering. The magnetoelectric coupling between ferromagnetism and ferroelectricity in multiferroic becomes suitable in the application of spintronics, memory and logic devices, and microelectronic memory or piezoelectric devices. In comparison with bulk multiferroic, the fabrication of multiferroic thin film with different structural geometries on substrate has reducible clamping effect. A brief procedure for multiferroic thin film fabrication in terms of their thermal conditions (temperature for film processing and annealing for crystallization) are described. Each synthesis methods have its own characteristic phenomenon in terms of film thickness, defects formation, crack free film, density, chip size, easier steps and availability etc. been described. A brief study towards phase structure and ME coupling for each multiferroic system of BiFeO3, BaTiO3, PbTiO3 and CaTiO3 is shown.
4
"Analysis of Fastener Tension and Clamping Strain." In Structural Shear Joints, 225–30. ASME Press, 2005. http://dx.doi.org/10.1115/1.802388.ch18.
Повний текст джерела
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"Clamping, Interference, Microslip, and Self-Piercing Rivets." In Structural Shear Joints, 41–65. ASME Press, 2005. http://dx.doi.org/10.1115/1.802388.ch3.
Повний текст джерела
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Hui, Z. "Research on the clamping device of the underwater wire rope cutter." In Advanced Materials and Structural Engineering, 975–78. CRC Press, 2016. http://dx.doi.org/10.1201/b20958-200.
Повний текст джерелаТези доповідей конференцій з теми "Clamping structure"
1
Feng, Weiyi, Lizhi Xu, Weiqiang Zhang, and Hongyang Wu. "Embedded structure for a voltage clamping circuit." In 2015 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2015. http://dx.doi.org/10.1109/apec.2015.7104714.
Повний текст джерела
2
Ye, Lijie. "Structure Design and Clamping Force Analysis Based on the End Clamping System of Polishing Industrial Robot." In 2021 6th International Conference on Control, Robotics and Cybernetics (CRC). IEEE, 2021. http://dx.doi.org/10.1109/crc52766.2021.9620171.
Повний текст джерела
3
Kuo, Chin-Hsing, and Lung-Yu Chang. "An Algebraic and Computational Strategy for Structure Decomposition of Variable Topology Mechanisms." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12510.
Повний текст джерелаАнотація:
Identifying all the functional topological structures embedded in a variable topology mechanism (VTM) is a leading step when analyzing the topological characteristics of the mechanism. Such an identification task is equivalent to the structure decomposition of the VTM. In this paper, we introduce a systematic approach, which is both algebraically and computationally manipulate-able, for the structure decomposition of VTMs. Based on a given source mechanism of a VTM, all its embedded functional topological structures can be identified through an algebraic computation via this method. For illustrating the presented approach, the decomposition of an automatic steel clamping and sawing mechanism is demonstrated.
4
Naranpanawe, Lakshitha, Tapan Saha, and Chandima Ekanayake. "Finite element analysis to understand the mechanical defects in power transformer winding clamping structure." In 2017 IEEE Power & Energy Society General Meeting (PESGM). IEEE, 2017. http://dx.doi.org/10.1109/pesgm.2017.8274617.
Повний текст джерела
5
Dou, Yunxia, Mingdi Wang, Dongning Su, and Kangmin Zhong. "Reconfigurable Pneumatic Clamping Device of Industry Manipulator Based on Toggle-Lever Force Amplifier in Series." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11023.
Повний текст джерелаАнотація:
The clamping mechanism plays critical roles in industry manipulator. At present, the clamping mechanism of industry manipulator is most pneumatic drive, which action is rapid. However, for clamping the geometrically rough similar or similar, even complete same work piece, different designers tend to use different design schemes of pneumatic clamping device. Even the same designer may also frequent changing his clamping schemes, such as using different cylinder with different structure, different force amplifier, different clamping mechanism and clamping elements, and so on. The traditional design methods mentioned above are out-of-order and non instructive. The problem is especially critical for today’s manufacturing industry, which features short term, large quantity and individual demand design. This article describes a new innovation design idea of reconfigurable pneumatic clamping mechanism based on toggle-lever force amplifier in series and rod-less piston cylinder. Based on the idea, we designed a series of clamping devices featuring clear logic idea. The graphic example, corresponding formula of output force and mechanics characteristics curve are given which of important reference value and the guide meaning for engineering fields. The reconfigurable pneumatic clamping device of industry manipulator based on toggle-lever force amplifier in series and rod-less piston cylinder present in this paper has the following advantages: (1) Then using the same clamping device, we can realize the changing from external clamping to internal clamping expediently. What we should do is just changing the direction of compressed air in and out the rod-less piston cylinder utilizing its symmetry. (2) The elements of force amplifier and clamping device are all geometrically simple bars, but they have various functions. (3) The elements of force-transferring mechanism based on rolling higher pair and the elements for clamping the work piece both are geometrically simple rolling wheels or its deformation after cutting. They have resembled manufacturing technology but distinct functions. (4) Though the changes of shape, dimension or location of the basic components, the corresponding clamping device can be quickly designed to meet the needs of internal or external clamping to the work piece for different dimension, different shape and different clamping force. (5) Using the two-step or three-step force-amplifier, the device solved the shortcoming of lower press result in the smaller force of pneumatic drive system, and thus can be instead of the hydraulic clamping device in certain extent which easily leads to environmental pollution.
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Yamaguchi, Hideya, Masahito Yashima, and Yoshinori Hirayama. "Vibration Reduction and Isolation by On-Off Control of Friction Force at Spring Support." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-3802.
Повний текст джерелаАнотація:
Abstract This paper presents a new method of on-off control for the spring support to reduce and isolate vibration transmitted to machines or structures. The procedure utilizes the auxiliary spring whose end is designed to control the clamping friction force with the brake mechanism. The clamping friction force is varied according to the switching law that is deduced from the variable structure systems (VSS) control theory taking into account the energy dissipation due to friction. The experiments and numerical simulations confirmed the effectiveness of the proposed method by investigating the transient response and the displacement transmissibility.
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Beamesderfer, Michael A., Ed Litcher, and Don L. DeVoe. "Micromechanical Clamps for Optical Fiber Packaging of High Aspect Ratio MEMS Devices." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/mems-23810.
Повний текст джерелаАнотація:
Abstract This paper describes the design and characterization of monolithic clamping structures for mechanical packaging of optical fibers in optical MEMS devices. Both single crystal silicon and nickel LIGA components have been investigated [1,2]. Mechanical clamping methods for optical fiber integration were perused both for on-chip attachment as well as alignment-assist in conjunction with other packaging methods. Arrays clamps with normal clamping forces ranging from 3mN to 375mN were designed, fabricated and characterized. A detailed theoretical analysis of clamping force for each design is presented and compared to measured results from fabricated devices. The clamps were evaluated on their ability to maintain alignment under a range of mechanical and thermal loads. Four arrays of eight clamp sets with varying applied normal clamping forces were designed by varying the deflection of 10μm and 20μm cantilever beams, and arranged in single-clamp and double-clamp configurations. A 100μm moment arm, integrated into the clamp structure, permitted the cantilevers to be initially deflected by the inserted fiber face during the fiber channel population. The populated test clamp arrays were heated from ambient conditions to 55 degrees Celsius to assess their stability under thermal strain, and monitored with an integrated Fabry-Perot whitelight interferometer. The maximum induced axial misalignment did not exceed 3μm. In addition to current theoretical and experimental results, alternative mechanical fiber clamp designs for both silicon and nickel microfabrication are presented and analyzed.
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Allen, Emily A., and John P. Swensen. "Controlling the Rotational DOF of Laminar Jamming Structures With End Clamping Mechanism." In ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/smasis2020-2399.
Повний текст джерелаАнотація:
Abstract Variable stiffness structures lie at the nexus of soft robots and traditional robots as they enable the execution of both high-force tasks and delicate manipulations. Laminar jamming structures, which consist of thin flexible sheets encased in a sealed chamber, can alternate between a rigid state when a vacuum is applied and a flexible state when the layers are allowed to slide in the absence of a pressure gradient. In this work, an additional mode of controllability is added by clamping and unclamping the ends of a simple laminar jamming beam structure. Previous works have focused on the translational degree of freedom that may be controlled via vacuum pressure; here we introduce a rotational degree of freedom that may be independently controlled with a clamping mechanism. Preliminary results demonstrate the ability to switch between three states: high stiffness (under vacuum), translational freedom (with clamped ends, no vacuum), and rotational freedom (with ends free to slide, no vacuum).
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Chen, Hu, Jianming Gong, Luyang Geng, and Shan-Tung Tu. "Numerical Analysis of Thermal Deformation and Residual Stress for the Brazed Plate-Fin Structure." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-94055.
Повний текст джерелаАнотація:
Compared to traditional shell-and-tube exchangers with the same material, compact plate-fin heat exchangers (PFHE) made of brazed stainless steel have superior heat transfer capability, less volume, lighter weight and low cost. Therefore it has been widely used in many industries, such as air separation, petrochemical, aerospace, energy etc. and PFHE has been the typical candidate to realize the miniaturization of heat exchanging equipments, which are the enabling technology for the miniaturization of chemical and thermal systems. It is negligible that residual stresses and thermal distortion under the effect of thermal cycle, self-constraint and clamping pressure load during brazing for the brazed plate-fin structure that has the millimeter-level function cell. This paper presents a thermo-mechanical finite element analysis for determining the deformation and residual stress of multi-layers stainless steel AISI 304 plate-fin structure, which are counter-flow and brazed with amorphous nickel-base filler metal BNi-2, based on the actual brazing process. The feature of deformation and residual stresses distribution are reported and the effect of 3 factors including the number of layers, brazing temperature, clamping pressure loads on the residual stresses and the distortion are investigated respectively.
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Hung, Y. Y., Y. H. Huang, and L. Liu. "Novel Washer as Force Transducer for Monitoring Clamping Force of Bolted Joints." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-94024.
Повний текст джерелаАнотація:
Bolts are widely used in industry for joining members together. The behavior and service life of bolted joints depend on several factors like bolt material, dimensions, surface finish, surface coating and thread tolerances. However, the uppermost factor affecting the reliability and durability is the correctness of the clamping force exerted by the bolt. Thus it is very important to monitor the bolt clamping force during assembly process to ensure a proper preload. Each of the available monitoring techniques including torque control, torque-angle control, strain gaged bolt and ultrasound suffers one or more limitations rendering the methods impractical for application in a production environment. In this paper, we propose an alternative method for determining clamping force. The method utilizes a simple washer whose surface has a speckle pattern; the speckle pattern acts as a strain sensor. By measuring the deformation of the washer using an image processing technique called fast digital image correlation, the clamping force can be determined. This method, which enables real-time monitoring of clamping force during fastening, has a potential of being used for mass measurement of clamping force in a production environment. Experiments conducted on a bolted structure with washers of different sizes have demonstrated the reliability and usefulness of this new approach.