Artículos de revistas: "Flexible structure"

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TAKAYAMA, Mineo. "Flexible Structure vs. Rigid Structure". Journal of the Society of Mechanical Engineers 113, n.º 1097 (2010): 253–56. http://dx.doi.org/10.1299/jsmemag.113.1097_253.

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2

Torgersrud, Morten. "A Neutral, Flexible Structure". Philosophy of Photography 3, n.º 1 (8 de diciembre de 2012): 185–93. http://dx.doi.org/10.1386/pop.3.1.185_7.

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Rogachko, S. I. y О. О. Pliasunova. "FLOATING FLEXIBLE PROTECTIVE STRUCTURE". Bulletin of Odessa State Academy of Civil Engineering and Architecture, n.º 78 (10 de marzo de 2020): 126–34. http://dx.doi.org/10.31650/2415-377x-2020-78-126-134.

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4

Han, Jae, Kwi-Il Park y Chang Jeong. "Dual-Structured Flexible Piezoelectric Film Energy Harvesters for Effectively Integrated Performance". Sensors 19, n.º 6 (24 de marzo de 2019): 1444. http://dx.doi.org/10.3390/s19061444.

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Improvement of energy harvesting performance from flexible thin film-based energy harvesters is essential to accomplish future self-powered electronics and sensor systems. In particular, the integration of harvesting signals should be established as a single device configuration without complicated device connections or expensive methodologies. In this research, we study the dual-film structures of the flexible PZT film energy harvester experimentally and theoretically to propose an effective principle for integrating energy harvesting signals. Laser lift-off (LLO) processes are used for fabrication because this is known as the most efficient technology for flexible high-performance energy harvesters. We develop two different device structures using the multistep LLO: a stacked structure and a double-faced (bimorph) structure. Although both structures are well demonstrated without serious material degradation, the stacked structure is not efficient for energy harvesting due to the ineffectively applied strain to the piezoelectric film in bending. This phenomenon stems from differences in position of mechanical neutral planes, which is investigated by finite element analysis and calculation. Finally, effectively integrated performance is achieved by a bimorph dual-film-structured flexible energy harvester. Our study will foster the development of various structures in flexible energy harvesters towards self-powered sensor applications with high efficiency.

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5

Rodríguez-Castro, Ramón, Alejandro Alcaraz-Caracheo y Álvaro Sánchez-Rodríguez. "Numerical modal control of a flexible beam structure". Ingeniería, investigación y tecnología 19, n.º 2 (1 de abril de 2018): 125–34. http://dx.doi.org/10.22201/fi.25940732e.2018.19n2.011.

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6

Holland, Pat. "Flexible Endoscopes: Structure and Function". Gastroenterology Nursing 24, n.º 3 (mayo de 2001): 116–19. http://dx.doi.org/10.1097/00001610-200105000-00003.

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7

Shoop, Nancy M. "Flexible Endoscopes: Structure and Function". Gastroenterology Nursing 24, n.º 6 (noviembre de 2001): 294–97. http://dx.doi.org/10.1097/00001610-200111000-00007.

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8

Holland, Pat y Nancy M. Shoop. "Flexible Endoscopes: Structure and Function". Gastroenterology Nursing 25, n.º 4 (julio de 2002): 142–45. http://dx.doi.org/10.1097/00001610-200207000-00003.

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9

Aranda-Espinoza, H. y D. Lavallee. "Structure factor of flexible membranes". Europhysics Letters (EPL) 43, n.º 3 (1 de agosto de 1998): 355–59. http://dx.doi.org/10.1209/epl/i1998-00365-x.

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10

Angelov, Plamen P. y Dimitar P. Filev. "Flexible models with evolving structure". International Journal of Intelligent Systems 19, n.º 4 (2004): 327–40. http://dx.doi.org/10.1002/int.10166.

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11

Glantz, Viktor, Phatthranit Phattharapornjaroen, Eric Carlström y Amir Khorram-Manesh. "Regional Flexible Surge Capacity—A Flexible Response System". Sustainability 12, n.º 15 (24 de julio de 2020): 5984. http://dx.doi.org/10.3390/su12155984.

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Surge capacity is the ability to manage the increased influx of critically ill or injured patients during a sudden onset crisis. During such an event, all ordinary resources are activated and used in a systematic, structured, and planned way to cope with the situation. There are, however, occasions where conventional healthcare means are insufficient, and additional resources must be summoned. In such an event, the activation of existing capabilities within community resources can increase regional surge capacity in a flexible manner. These additional resources together represent the concept of Flexible Surge Capacity. This study aims to investigate the possibility of establishing a Flexible Surge Capacity response system to emergencies by examining the main components of surge capacity (Staff, Stuff, Structure, System) within facilities of interest present in the Western Region of Sweden. Through a mixed-method and use of (A) questionnaires and (B) semi-structured key-informant interviews, data was collected from potential alternative care facilities to determine capacities and capabilities and barriers and limitations as well as interest to be included in a flexible surge capacity response system. Both interest and ability were found in the investigated primary healthcare centers, veterinary and dental clinics, schools, and sports and hotel facilities to participate in such a system, either by receiving resources and/or drills and exercises. Barriers limiting the potential participation in this response system consisted of a varying lack of space, beds, healthcare materials, and competencies along with a need for clear organizational structure and medical responsibility. These results indicate that the concept of flexible surge capacity is a feasible approach to emergency management. Educational initiatives, drills and exercises, layperson empowerment, organizational and legal changes and sufficient funding are needed to realize the concept.

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12

MATSUDA, Keishi, Masahiro WATANABE y Kensuke HARA. "63852 Dynamic Behavior and Stability of a Flexible Cable Structure with Large Sag Subjected to Periodic Excitation(Flexible Multibody Dynamics)". Proceedings of the Asian Conference on Multibody Dynamics 2010.5 (2010): _63852–1_—_63852–9_. http://dx.doi.org/10.1299/jsmeacmd.2010.5._63852-1_.

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13

Bemanian, Mohammadreza, Mohammadjavad Mahdavinejad, Ali Karam y Sima Rezaei Ashtiani. "Architectural Application of Smart Materials for Non-Flexible Structures Made by Flexible Formworks". Applied Mechanics and Materials 232 (noviembre de 2012): 132–36. http://dx.doi.org/10.4028/www.scientific.net/amm.232.132.

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Flexible formworks are dominantly used for concrete constructions. These constructions become rigid after curing and their form cannot be changed, also their color or translucency is stable during usage period; i.e. these constructions are not flexible. On the other hand, in order to satisfy new architectural requirements the necessity of flexibility and smartness is undeniable for the construction.The questions of this paper are: How smartness can be added to rigid structures? What are the roles of nano-flexible formworks to turn non-flexible structures into flexible ones? To answer the research questions, descriptive - analytical research method has been adopted and empirical data gathered to feed inference mechanism. Our investigation shows that if the flexible formwork has been made by smart materials which are changeable in nano-scale, and the formwork is left on the structure even after curing, it would act as a nano-flexible skin for the structure and would satisfy some architectural requirements in nano-scale.

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14

Sheng, Xianjun, Yuanli Kong, Fengyun Zhang y Rui Yang. "Identification for Active Vibration Control of Flexible Structure Based on Prony Algorithm". Shock and Vibration 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/9891054.

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Flexible structures have been widely used in many fields due to the advantages of light quality, small damping, and strong flexibility. However, flexible structures exhibit the vibration in the process of manipulation, which reduces the pointing precision of the system and causes fatigue of the machine. So, this paper focuses on the identification method for active vibration control of flexible structure. The modal parameters and transfer function of the system are identified from the step response signal based on Prony algorithm, while the vibration is attenuated by using the input shaping technique designed according to the parameters identified from the Prony algorithm. Eventually, the proposed approach is applied to the most common flexible structure, a piezoelectric cantilever beam actuated by Macro Fiber Composite (MFC). The experimental results demonstrate that the Prony algorithm is very effective and accurate on the dynamic modeling of flexible structure and input shaper could significantly reduce the vibration and improve the response speed of system.

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15

Amirouche, F. M. L. y R. L. Huston. "Dynamics of Large Constrained Flexible Structures". Journal of Dynamic Systems, Measurement, and Control 110, n.º 1 (1 de marzo de 1988): 78–83. http://dx.doi.org/10.1115/1.3152654.

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This paper presents an automated procedure useful in the study of large constrained flexible structures, undergoing large specified motions. The structure is looked upon as a “partially open tree” system, containing closed loops in some of the branches. The governing equations are developed using Kane’s equations as formulated by Huston et al. The accommodation of the constraint equations is based on the use of orthogonal complement arrays. The flexibility and oscillations of the bodies is modelled using finite segment modelling, structure analysis, and scaling techniques. The procedures developed are expected to be useful in applications including robotics, space structures, and biosystems.

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16

Qu, Jun Tian, Xiao Yang y Yu Chen Xiao. "Dual PD Control of Flexible Smart Structure Based on LQR Algorithm". Applied Mechanics and Materials 437 (octubre de 2013): 634–38. http://dx.doi.org/10.4028/www.scientific.net/amm.437.634.

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The flexible smart structure is broadly applied in various fields. In order to reduce the vibration of smart structures, a dual loop PD control strategy is proposed based on the Lagrangian dynamics mathematical modeling of the flexible system and a revision of the traditional LQR algorithm, the simulation and physical experiments show that the proposed approach is efficient in controlling and damping out the vibration and disturbance in flexible smart structure system.

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17

Qian, Hui, Yimeng Wu, Rui Zhu, Dahai Zhang y Dong Jiang. "Modal Identification of Ultralow-Frequency Flexible Structures Based on Digital Image Correlation Method". Applied Sciences 12, n.º 1 (24 de diciembre de 2021): 185. http://dx.doi.org/10.3390/app12010185.

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Traditional modal testing has difficulty accurately identifying the ultralow-frequency modes of flexible structures. Ultralow-frequency excitation and vibration signal acquisition are two main obstacles. Aiming at ultralow-frequency modal identification of flexible structures, a modal testing method based on Digital Image Correlation method and Eigensystem Realization Algorithm is proposed. Considering impulse and shaker excitation are difficult to make generate ultralow-frequency vibration of structures, the initial displacement is applied to the structure for excitation. The ultralow-frequency accelerometer always has a large mass, which will change the dynamics performance of the flexible structure, so a structural vibration response was obtained through the Digital Image Correlation method. After collecting the free-decay vibration signal, the ultralow-frequency mode of the structure was identified by using the Eigensystem Realization Algorithm. Ground modal tests were conducted to verify the proposed method. Firstly, a solar wing structure was adopted, from which it was concluded that the signal acquisition using Digital Image Correlation method had high feasibility and accuracy. Secondly, an ultralow-frequency flexible cantilever beam structure which had the theoretical solution was employed to verify the proposed method and the theoretical fundamental frequency of the structure was 0.185 Hz. Results show that the Digital Image Correlation method can effectively measure the response signal of the ultralow-frequency flexible structure, and obtain the dynamics characteristics.

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18

Mondal, Pradip Kumar y Deepak Chopra. "Crystal structure landscape of conformationally flexible organo-fluorine compounds". CrystEngComm 18, n.º 1 (2016): 48–53. http://dx.doi.org/10.1039/c5ce01721a.

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The crystal structure landscape of an unsubstituted benzanilide was generated and a number of hypothetical structures were accessed with experimentally obtained crystal structures of mono-, di-, tetra- and penta-fluorobenzanilides.

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19

Zhang, Hong-Hua, H. Matsuo, Y. Morita y H. Yamakawa. "Stabilization of a deployable flexible structure". Acta Astronautica 43, n.º 7-8 (octubre de 1998): 369–76. http://dx.doi.org/10.1016/s0094-5765(98)00172-6.

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20

Kendall, Amy, Michele McDonald, Wen Bian, Timothy Bowles, Sarah C. Baumgarten, Jian Shi, Phoebe L. Stewart et al. "Structure of Flexible Filamentous Plant Viruses". Journal of Virology 82, n.º 19 (30 de julio de 2008): 9546–54. http://dx.doi.org/10.1128/jvi.00895-08.

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ABSTRACTFlexible filamentous viruses make up a large fraction of the known plant viruses, but in comparison with those of other viruses, very little is known about their structures. We have used fiber diffraction, cryo-electron microscopy, and scanning transmission electron microscopy to determine the symmetry of a potyvirus, soybean mosaic virus; to confirm the symmetry of a potexvirus, potato virus X; and to determine the low-resolution structures of both viruses. We conclude that these viruses and, by implication, most or all flexible filamentous plant viruses share a common coat protein fold and helical symmetry, with slightly less than 9 subunits per helical turn.

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21

Katebi, M. R. "Control Design for Smart Flexible Structure". IFAC Proceedings Volumes 26, n.º 2 (julio de 1993): 597–600. http://dx.doi.org/10.1016/s1474-6670(17)48797-0.

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22

Magni, J. F., Y. Le Gorrec, D. Alazard y C. Chiappat. "Flexible Structure Control by Eigenstructure Assignment". IFAC Proceedings Volumes 30, n.º 6 (mayo de 1997): 653–58. http://dx.doi.org/10.1016/s1474-6670(17)43438-0.

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23

Sidman, M. D. y G. F. Franklin. "Adaptive Control of a Flexible Structure". IFAC Proceedings Volumes 20, n.º 2 (julio de 1987): 277–82. http://dx.doi.org/10.1016/s1474-6670(17)55974-1.

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24

Huertas, Vladímir Villaverde y Boris Rohaľ-Ilkiv. "Vibration Suppression of a Flexible Structure". Procedia Engineering 48 (2012): 233–41. http://dx.doi.org/10.1016/j.proeng.2012.09.509.

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25

A. M. Al-Khafaji, A., A. Al-Khafaji, I. Z. Mat Darus y M. F. Jamid. "ANFIS Modelling of Flexible Plate Structure". Iraqi Journal for Electrical And Electronic Engineering 6, n.º 1 (28 de junio de 2010): 78–82. http://dx.doi.org/10.33762/eeej.2010.54461.

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26

Antipov, Evgenij, Sergei Kuptsov, Valerij Kulichikhin, Dzidra Tur y Nikolaj Plate. "Mesophase structure of flexible-chain polymers". Makromolekulare Chemie. Macromolecular Symposia 26, n.º 1 (marzo de 1989): 69–89. http://dx.doi.org/10.1002/masy.19890260109.

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27

Mohapatra, S. C. y T. Sahoo. "Oblique wave diffraction by a flexible floating structure in the presence of a submerged flexible structure". Geophysical & Astrophysical Fluid Dynamics 108, n.º 6 (24 de julio de 2014): 615–38. http://dx.doi.org/10.1080/03091929.2014.937806.

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28

Kumagai, Keisuke, Akira Todoroki y Ryosuke Matsuzaki. "OS17-2-3 Foldable CFRP structure using Partially-flexible composites for Morphing wing". Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2007.6 (2007): _OS17–2–3——_OS17–2–3—. http://dx.doi.org/10.1299/jsmeatem.2007.6._os17-2-3-.

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29

Altintas, Y., D. Montgomery y E. Budak. "Dynamic Peripheral Milling of Flexible Structures". Journal of Engineering for Industry 114, n.º 2 (1 de mayo de 1992): 137–45. http://dx.doi.org/10.1115/1.2899766.

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A dynamic model for peripheral milling of very flexible plate type structures has been presented. The structural dynamics of a cantilevered plate structure is modelled at the tool-workpiece contact zone. The interaction of the very flexible plate structure and rigid end mill during dynamic milling is modelled. The variation in surface, chip thickness, and structural dynamics of the plate are considered in determining the milling forces. The proposed model provides surface finish form errors displacements at the tool-workpiece contact zone, and cutting forces for dynamic end milling operations.

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30

Liu, Yiming, Ziming Xiong, Yanyu Qiu, Fuhuai Yan y Chao Ma. "Analysis of Traction and Unfolding Dynamics of Space-Symmetric Flexible Webs for UAV Interception and Capture". Symmetry 14, n.º 9 (13 de septiembre de 2022): 1915. http://dx.doi.org/10.3390/sym14091915.

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A new type of flexible web with a spatial symmetry structure is proposed to address the interception and acquisition of UAVs. It is different from the existing flexible web structure. According to the mechanical characteristics of the flexible web, the dynamic analysis model of the flexible web is established through theoretical deduction. Through finite element simulation calculation, the flexible webs of three different spatial symmetric structures are compared and analyzed. The internal force and air attitude of the three flexible webs are discussed. Among them, the new flexible web has a lag time of 0.162 s and a flight height of 11.624 m. The above simulation parameters are better than those of the other two symmetrical structures. It was proved that the new spatial symmetric flexible web has good traction and deployment performance. In addition, a ground verification test is designed and carried out. The web attitude and flight altitude parameters are compared with the simulation and test results. It is found that the simulation and experimental process of the new symmetric structure web are in good agreement, the synchronization of attitude change is good, and the flight altitude error of the two is controlled at about 5%. The feasibility and effectiveness of this method are proven and it can provide a reference for the research of flexible interception and acquisition of UAVs.

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31

MaCurdy, Thomas, Xiaohong Chen y Han Hong. "Flexible Estimation of Treatment Effect Parameters". American Economic Review 101, n.º 3 (1 de mayo de 2011): 544–51. http://dx.doi.org/10.1257/aer.101.3.544.

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A variety of identification strategies have a common cell structure, in which the observed heterogeneity of the regression defines a partition of the sample into cells. Typically in the presence of exogenous covariates that define the cell structure, identification assumptions are imposed conditional on each value of the covariate, or cell by cell. Treatment effects across cells are typically heterogeneous. Researchers might be interested in unconditional parameters which are the averaged treatment effects across the cells. Alternatively, treatment effects can be estimated more efficiently if researchers are willing to impose additional parametric and semiparametric structures on the heterogeneous treatment effects across cells.

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32

Song, Jixiang, Weimin Chen, Dingbang Yan y Shuangxi Guo. "Study on drag reduction of flexible structure under flows". E3S Web of Conferences 245 (2021): 01019. http://dx.doi.org/10.1051/e3sconf/202124501019.

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Flexible structures are common in nature and engineering. Under the action of fluid, the flexible structure bends to reduce drag. The study of this phenomenon has important scientific and engineering significance, so this article conducts research. Firstly, the differential equations are established, then solved by numerical methods, and finally numerically simulated.

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33

D’Ambrogio, Walter y Annalisa Fregolent. "Use of experimental dynamic substructuring to predict the low frequency structural dynamics under different boundary conditions". Mathematics and Mechanics of Solids 23, n.º 11 (28 de agosto de 2017): 1444–55. http://dx.doi.org/10.1177/1081286517727147.

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Flexible structural components can be attached to the rest of the structure using different types of joints. For instance, this is the case of solar panels or array antennas for space applications that are joined to the body of the satellite. To predict the dynamic behaviour of such structures under different boundary conditions, such as additional constraints or appended structures, it is possible to start from the frequency response functions in free-free conditions. In this situation, any structure exhibits rigid body modes at zero frequency. To experimentally simulate free-free boundary conditions, flexible supports such as soft springs are typically used: with such arrangement, rigid body modes occur at low non-zero frequencies. Since a flexible structure exhibits the first flexible modes at very low frequencies, rigid body modes and flexible modes become coupled: therefore, experimental frequency response function measurements provide incorrect information about the low frequency dynamics of the free-free structure. To overcome this problem, substructure decoupling can be used, that allows us to identify the dynamics of a substructure (i.e. the free-free structure) after measuring the frequency response functions on the complete structure (i.e. the structure plus the supports) and from a dynamic model of the residual substructure (i.e. the supporting structure). Subsequently, the effect of additional boundary conditions can be predicted using a frequency response function condensation technique. The procedure is tested on a reduced scale model of a space solar panel.

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Seixas, Mario, Luís Eustáquio Moreira, Patrick Stoffel, João Bina, José Luiz Mendes Ripper, Jorge Lucas Ferreira y Khosrow Ghavami. "Analysis of a self-supporting bamboo structure with flexible joints". International Journal of Space Structures 36, n.º 2 (21 de marzo de 2021): 137–51. http://dx.doi.org/10.1177/09560599211001660.

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Self-supporting bamboo structures are ultralight architectural modules applying bamboo round poles, tensile pantographic grids and textile membranes. The structural system applies articulated flexible joints in polyester ropes and locking bio-composite bandage rings, keeping bamboo bars free of torsion stresses. An experimental 1:3 scale prototype and a full-scale structure were fabricated to make previsions about the physical and mechanical behavior of the structure. The experimental results were verified applying a numerical model for the structure. In turn, the flexible joints were analyzed theoretically. The computer model was analyzed using the finite element SAP2000 program. The numerical results were in close agreement with the experimental results specifically for the structural behavior of the flexible joints.

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Li, Dezhao, Yangtao Ruan, Chuangang Chen, Wenfeng He, Cheng Chi y Qiang Lin. "Design and Thermal Analysis of Flexible Microheaters". Micromachines 13, n.º 7 (29 de junio de 2022): 1037. http://dx.doi.org/10.3390/mi13071037.

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With the development of flexible electronics, flexible microheaters have been applied in many areas. Low power consumption and fast response microheaters have attracted much attention. In this work, systematic thermal and mechanical analyses were conducted for a kind of flexible microheater with two different wire structures. The microheater consisted of polyethylene terephthalate (PET) substrate and copper electric wire with graphene thin film as the middle layer. The steady-state average temperature and heating efficiency for the two structures were compared and it was shown that the S-shaped wire structure was better for voltage-controlled microheater other than circular-shaped structure. In addition, the maximum thermal stress for both structures was from the boundary of microheaters, which indicated that not only the wire structure but also the shape of micro heaters should be considered to reduce the damage caused by thermal stress. The influence resulting from the thickness of graphene thin film also has been discussed. In all, the heating efficiency for flexible microheaters can be up to 135 °C/W. With the proposed PID voltage control system, the response time for the designed microheater was less than 10 s. Moreover, a feasible fabrication process flow for these proposed structures combing thermal analysis results in this work can provide some clues for flexible microheaters design and fabrication in other application areas.

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36

Wen, Haolin. "Flexible Organic Light-Emitting Diodes: Structure and Fabrication". Highlights in Science, Engineering and Technology 27 (27 de diciembre de 2022): 716–22. http://dx.doi.org/10.54097/hset.v27i.3837.

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Flexible organic light-emitting diodes (OLED) technology with thin, light in weight, and free in design have been developed and perfected rapidly. The versatility of flexible OLED technology has been effectively proved in the sectors of displays, lighting, and medicine. In this article, the structure and fabrication of flexible OLED were introduced. Normal flexible OLED device construction includes flexible OLED substrate, barrier layers, electrode and organic layer. The flexible OLED is made on the substrate. The barrier layer is used to shield the OLED material from airborne oxygen and humidity. The electrodes are used for electricity, and the organic layer is used for light. The production processes of flexible OLED include coat-debond with advantages such as good stability and thermal conductivity, bond-debond with the advantage of simple and convenient and roll-to-roll [R2R] method with advantages of low cost, and mass production. Additionally, the application fields of these methods have been highlighted.

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Punjani, Ali y David Fleet. "3D Flexible Refinement: Structure and Motion of Flexible Proteins from Cryo-EM". Microscopy and Microanalysis 28, S1 (22 de julio de 2022): 1218. http://dx.doi.org/10.1017/s1431927622005074.

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38

Lee, Chan-Jae, Sung-Jei Hong, Won-Keun Kim y Jeong-In Han. "TFD Device with Symmetrical Structure of Flexible Electrode Subject to Flexible Substrate". Transactions on Electrical and Electronic Materials 3, n.º 4 (1 de diciembre de 2002): 32–35. http://dx.doi.org/10.4313/teem.2002.3.4.032.

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39

Zheng, Hehui, Han Wang, Kunran Yi, Jian Lin, An Chen, Lingming Chen, Zebiao Zou et al. "Wearable LIG Flexible Stress Sensor Based on Spider Web Bionic Structure". Coatings 13, n.º 1 (11 de enero de 2023): 155. http://dx.doi.org/10.3390/coatings13010155.

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Bionic structures are widely used in scientific research. Through the observation and study of natural biological structure, it is found that spider web structure is composed of many radial silk lines protruding from the center and spiral silk lines surrounding the center. It has high stability and high sensitivity, and is especially suitable for the production of sensors. In this study, a flexible graphene sensor based on a spider web bionic structure is reported. Graphene, with its excellent mechanical properties and high electrical conductivity, is an ideal material for making sensors. In this paper, laser-induced graphene (LIG) is used as a sensing material to make a spider web structure, which is encapsulated onto a polydimethylsiloxane (PDMS) substrate to make a spider web structured graphene flexible strain sensor. The study found that the stress generated by the sensor of the spider web structure in the process of stretching and torsion can be evenly distributed in the spider web structure, which has excellent resonance ability, and the overall structure shows good structural robustness. In the experimental test, it is shown that the flexible stress sensor with spider web structure achieves high sensitivity (GF is 36.8), wide working range (0–35%), low hysteresis (260 ms), high repeatability and stability, and has long-term durability. In addition, the manufacturing process of the whole sensor is simple and convenient, and the manufactured sensor is economical and durable. It shows excellent stability in finger flexion and extension, fist clenching, and arm flexion and extension applications. This shows that the sensor can be widely used in wearable sensing devices and the detection of human biological signals. Finally, it has certain development potential in the practical application of medical health, motion detection, human-computer interaction and other fields.

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40

Yang, Wen Qing, Bi Feng Song, Wen Ping Song, Zhan Ke Li y Ya Feng Zhang. "Computational Fluid-Structure Dynamics Coupling Research of Flexible Wing". Advanced Materials Research 354-355 (octubre de 2011): 655–58. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.655.

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This paper presents a computational fluid-structure dynamics coupling method of flexible wing. The computational fluid dynamics is solving RANS equations. The stiffness used in computational structure dynamics is tested by experiments. Then the aerodynamic performance of flexible wing is researched and compared with rigid wing. The results show that the lift and thrust generated by flexible wing are less than the rigid wing. Flexible wing can slower the variety of aerodynamic performance when the flight environment is changing. And flexible wing has bigger stalling angle.

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41

Mohapatra, S. C. y C. Guedes Soares. "3D hydroelastic modelling of fluid–structure interactions of porous flexible structures". Journal of Fluids and Structures 112 (julio de 2022): 103588. http://dx.doi.org/10.1016/j.jfluidstructs.2022.103588.

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42

Teich, Martien, Norbert Gebbeken y Martin Larcher. "Aerodynamic Damping and Fluid-Structure Interaction of Blast Loaded Flexible Structures". Applied Mechanics and Materials 82 (julio de 2011): 491–96. http://dx.doi.org/10.4028/www.scientific.net/amm.82.491.

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This paper analyses the e ects of air-structure interaction of systems subjectedto weak blast loads. While these coupling e ects are negligible for typical steel or concretestructures, they may dominate the dynamic response of lighter and more exible (compliant)systems like membranes, blast curtains or cable facades. For these light and exible systems,a classical decoupled analysis, i.e., neglecting the inuence of the surrounding air, might sig-ni cantly overestimate the deections and strains. However, we show that the coupling e ectscan be accounted for by basically adding a viscous aerodynamic damping force. We discussand compare two approaches how to obtain the aerodynamic damping term. With decreasingstructural sti ness and mass, the damping contribution of air increases signi cantly. The resultsof Hydrocode simulations are presented, and an outlook into further areas of research is given.

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Bano, Tayyaba, Franziska Hegner, Martin Heinrich y Ruediger Schwarze. "Investigation of Fluid-Structure Interaction Induced Bending for Elastic Flaps in a Cross Flow". Applied Sciences 10, n.º 18 (5 de septiembre de 2020): 6177. http://dx.doi.org/10.3390/app10186177.

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With the recent increase in the design of light and flexible structures, numerical investigations of fluid and structure together play a significant role in most engineering applications. Therefore, the current study presents an examination of fluid-structure interaction involving flexible structures. The problem is numerically solved by a commercial software ANSYS-Workbench. Two-way coupled three-dimensional transient simulations are carried out for the flexible flaps of different thicknesses in glycerin for a laminar flow and Reynolds number ranging from 3 < Re < 12. The bending line of the flaps is compared with experimental data for different alignments of the flaps relative to the fluid flow. The study reports the computation of the maximum tip-deflection and deformation of flaps fixed at the bottom and mounted normal to the flow. Additionally, drag coefficients for flexible flaps are computed and flow regimes in the wake of the flaps are presented. As well, the study gives an understanding on how the fluid response changes as the structure deforms and the model is appropriate to predict the behavior of thick and comparatively thinner flaps. The results are sufficiently encouraging to consider the present model for analyzing turbulent flow processes against flexible objects.

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44

Wang, Ran, Hao Tian, Hong Liu Wang, Yang Zhao, Chen Yang y Xin Bin Hou. "SSPS Dynamic Modeling and the Flexible Vibration Suppression". Applied Mechanics and Materials 799-800 (octubre de 2015): 724–27. http://dx.doi.org/10.4028/www.scientific.net/amm.799-800.724.

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Space solar power satellite (SSPS) as a very large flexible spacecraft structure with complex configuration, large size and number of units bring the difficulties to dynamics modeling and analysis. Considering SSPS structure characteristics, equivalent strain and kinetic energy theory is adopted to establish the equivalent beam model of SSPS truss structure. The assumed mode method is adopted to describe the flexible body. The modal truncation method implements the dynamics system order reduction. Mixed coordinates method is adopted to establish the rigid-flexible coupled dynamic model. The established dynamic model can reflect dynamic characteristics of SSPS, achieve control requirements for SSPS and decrease the workload of simulation calculation. The independent modal space control (IMSC) method is proposed to active control research view of the large displacement, nonlinearity, low and dense mode frequency, light damping of flexible structures. Simulation results on flexible solar array show the effectiveness of the control method.

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45

Maslen, Eric H. "Positive Real Zeros in Flexible Beams". Shock and Vibration 2, n.º 6 (1995): 429–35. http://dx.doi.org/10.1155/1995/395365.

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Feedback control of flexible structures naturally involves actuators and sensors that often cannot be placed at the same point in the structure. It has been widely recognized that this noncollocation can lead to difficult control problems and, in particular, difficulty in achieving high robustness to variation in the dynamic properties of the structure. This problem has previously been traced to transmission zeros in the dynamic transfer function between sensor location and actuator location, especially those lying on the positive real axis in the complex plane. In this artie/e, the physical significance of these zeros is explored and the dynamic properties of beams that give rise to real positive zeros are contrasted to those of torsional and compressive systems that do not.

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46

Mu, Hui Jin. "Study on Variable Structure Vibration Control for Flexible Manipulator". Advanced Materials Research 875-877 (febrero de 2014): 1961–66. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.1961.

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In recent years, modeling and control of flexible space robots are extensively researched. Compared with traditional rigid robots, flexible robots have low energy consumption, wide operating space, high carrying capacity and other characteristics. However, due to its special structure, the robot arm will get deformation and vibration in motion, which brings a lot of problems to the positioning and tracking control of flexible space robots. Therefore, directing at the dynamics modeling and control issues of the free-floating flexible dual-arm space robots, this article carries out in-depth study. This paper first studies the elastic deformation and vibration of the flexible space manipulator and the robust control problem of the system trajectory tracking for free-floating flexible dual-arm space robots.

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47

Quan, R. y D. Stech. "Time Varying Passive Vibration Absorption for Flexible Structures". Journal of Vibration and Acoustics 118, n.º 1 (1 de enero de 1996): 36–40. http://dx.doi.org/10.1115/1.2889632.

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A time varying extension of the passive vibration absorber is described, which increases the effectiveness of a small number of passive vibration absorbers on large or changing flexible structures. Initially, the extended absorber is targeted on a subset of the modes of the flexible structure. A stable switching scheme is described, which allows the absorber to target different subsets of modes, or to adapt to changes in the flexible structure. Computer simulation and experimental work are given which demonstrate the effectiveness of the extended absorber.

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48

Alberts, Thomas E., Houchun Xia y Yung Chen. "Dynamic Scaling of Flexible Structures With Viscoelastic Components". Journal of Vibration and Acoustics 114, n.º 4 (1 de octubre de 1992): 449–53. http://dx.doi.org/10.1115/1.2930283.

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Laboratory dynamic testing of large and complex space structures can be difficult and expensive, if practical at all. The use of dynamically scaled test articles is a standard approach to laboratory testing which helps to avoid these problems. The theory and practice of dynamic scaling for elastic structures are well established and validated; however, the issue of scaling structures with viscoelastic components has not been thoroughly investigated. In a structure that is “replica scaled” by a factor 1/λ, the natural frequencies are each scaled by a factor λ. For proper dynamic scaling, each corresponding damping ratio should be unchanged from that of the original full scale structure. The difficulty that arises with structures incorporating viscoelastic components is that the viscoelastic material properties vary with frequency in a nonlinear fashion. Thus, for a particular mode of a scaled model, the viscoelastic material’s damping properties are evaluated at a frequency which is modified by a factor 1/λ and as a consequence the damping ratio does not scale properly. To solve this problem, the authors propose taking advantage of the temperature dependence of viscoelastic material properties. By appropriately controlling the experimental temperature of the scaled structure, it is possible to obtain accurate dynamic scaling results. In this paper, the proposed frequency-temperature compensation method of dynamic scaling for viscoelastically damped structures is developed and experimentally validated.

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49

Jain, Prathik S. "2 Way Fluid-Structure Interaction Study of a Wing Structure". International Journal for Research in Applied Science and Engineering Technology 9, n.º 8 (31 de agosto de 2021): 2593–606. http://dx.doi.org/10.22214/ijraset.2021.37834.

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Abstract: In this paper a scaled down model of a wing of rectangular planform is designed and the static analysis on the wing is carried out to determine the aerodynamics forces, stresses acting on it and the frequency of various modes. The iteration for the analysis is carried out for three materials namely, Aluminium 7075 T-6, Glass Fibre Reinforced Polymer and Aluminium Metal Matrix Composite. The analysis in the coupled mode is conducted and compared with the results obtained from that of static analysis to observe the changes in the flow pattern and how the structure behaves when the wing is considered to be flexible. In the coupled mode analysis 2 Way Fluid Structure Interaction analysis is carried out. The material properties and the results obtained from the analysis is compared to select the best out of the three materials. The change in the aerodynamic properties of the wing when it is considered to be flexible is also highlighted by a method of comparison. From the results obtained, it is observed that Aluminium Metal Matrix Composite has the least deformation for the same loading and can withstand higher stress. Hence, Aluminium Metal Matrix Composite exhibits better characteristics in comparison with Glass Fibre Reinforced Polymer and Aluminium 7075 T-6. Additionally, it is noticed that the aerodynamic properties of the wing is reduced when it is considered as a flexible structure. This can be highlighted by the 5.42% decrease in the L/D ratio between the CFD analysis and the 2 Way FSI analysis results. Keywords: Fluid Structure Interaction; Flexible Wing; CFD; Coupled Mode Analysis;

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50

Huang, Wenkai, Junlong Xiao, Feilong Zeng, Puwei Lu, Guojian Lin, Wei Hu, Xuyu Lin y Yu Wu. "A Quadruped Robot with Three-Dimensional Flexible Legs". Sensors 21, n.º 14 (19 de julio de 2021): 4907. http://dx.doi.org/10.3390/s21144907.

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As an important part of the quadruped robot, the leg determines its performance. Flexible legs or flexible joints aid in the buffering and adaptability of robots. At present, most flexible quadruped robots only have two-dimensional flexibility or use complex parallel structures to achieve three-dimensional flexibility. This research will propose a new type of three-dimensional flexible structure. This passive compliant three-dimensional flexibility reduces the weight and complex structure of the robot. The anti-impact performance of the robot is verified by a side impact experiment. The simulation and experiments show that the robot still has good stability even under a simple algorithm and that the flexible leg can reduce the impact on the quadruped robot and improve the environmental adaptability of the robot.

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