Relevant bibliographies by topics / Rolling-hinge mechanism

Academic literature on the topic 'Rolling-hinge mechanism'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Rolling-hinge mechanism"

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Lou, Jizhong, Tadayuki Yago, Arkadiusz G. Klopocki, Padmaja Mehta, Wei Chen, Veronika I. Zarnitsyna, Nicolai V. Bovin, Cheng Zhu, and Rodger P. McEver. "Flow-enhanced adhesion regulated by a selectin interdomain hinge." Journal of Cell Biology 174, no. 7 (September 21, 2006): 1107–17. http://dx.doi.org/10.1083/jcb.200606056.

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L-selectin requires a threshold shear to enable leukocytes to tether to and roll on vascular surfaces. Transport mechanisms govern flow-enhanced tethering, whereas force governs flow-enhanced rolling by prolonging the lifetimes of L-selectin–ligand complexes (catch bonds). Using selectin crystal structures, molecular dynamics simulations, site-directed mutagenesis, single-molecule force and kinetics experiments, Monte Carlo modeling, and flow chamber adhesion studies, we show that eliminating a hydrogen bond to increase the flexibility of an interdomain hinge in L-selectin reduced the shear threshold for adhesion via two mechanisms. One affects the on-rate by increasing tethering through greater rotational diffusion. The other affects the off-rate by strengthening rolling through augmented catch bonds with longer lifetimes at smaller forces. By forcing open the hinge angle, ligand may slide across its interface with L-selectin to promote rebinding, thereby providing a mechanism for catch bonds. Thus, allosteric changes remote from the ligand-binding interface regulate both bond formation and dissociation.
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Demircioğlu, Derya, Berkan Ecevitoğlu, and Gürol Seyitoğlu. "Evidence of a rolling hinge mechanism in the seismic records of the hydrocarbon-bearing Alaşehir graben, western Turkey." Petroleum Geoscience 16, no. 2 (April 16, 2010): 155–60. http://dx.doi.org/10.1144/1354-079309-017.

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Plewa, Julian, Małgorzata Płońska, and Kamil Feliksik. "An Experimental Study of Auxetic Tubular Structures." Materials 15, no. 15 (July 29, 2022): 5245. http://dx.doi.org/10.3390/ma15155245.

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Auxetic tubular structures are widely known structures, characterized by a negative Poisson’s ratio upon stretching and deformation in the axial and transverse directions, which have numerous application possibilities. In this paper, tubular structures were realized by rolling up planar auxetic structures and using rigid square frames as unit cells. Planar and tubular structures were built from square frames that were 3D printed with plastic or laser-cut from metal. The changes in linear dimensions of the studied structures were based on a hinge mechanism, the functioning of which was experimentally verified on different solutions leading to square unit cells. To connect the square frames of the structure, an innovative solution was used in the form of rotation axes on their surface at a preset distance from the edge of the square frame. The geometric parameter thus introduced was used to determine the relative change in the size of the structure when stretched (i.e., when moving from the closed to the open position).
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Rakhmanov, S. R. "Some peculiarities of the process of the pipe purse firmware on the firmware." Metallurgicheskaya i gornorudnaya promyshlennost, no. 1 (2019): 31–39. http://dx.doi.org/10.33101/s001-1700087840.

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Purpose. Conducting research aimed at choosing the rational modes of flashing the tubular billet by stabilizing the dynamic characteristics of the drive power line of heavy-duty piercing mills TPA. Methodology. The dynamics of the power line of the piercing mill of the pipe-rolling unit (TPA) are considered, taking into account the peculiarities of the behavior of the spindle hinges and the mechanism for setting the work rolls. Findings. The differential equation of motion of the line of the main drive of the piercing mill is composed and its numerical solution is given. An adapted three-mass dynamic model of the system is considered and a solution is obtained using the software Solid Works IT Simulation X. The basic conditions for the occurrence of unstable dynamic phenomena in the fieldline and the installation mechanism of the piercing mill rolls are formulated. It is shown that the unstable dynamics of the system are one of the main reasons for the discrepancy between the results of well-known theoretical, experimental studies and pipe thickness measurement at TPA 350 piercing mills. Originality. The main causes of the emergence of parametric oscillations in the drive of the working stand of the piercing mill, the installation mechanism of the work rolls in connection with the mechanism of formation of the thin-wall thickness of pipes are established. The areas of stability of the system’s functioning are determined depending on the operating modes and the angle of feed of the work rolls, taking into account the spatial position of the elements of the spindle device. The necessary and sufficient stability conditions for the joint stable functioning of the power line elements of the piercing mill are formed. Practical value. To stabilize the processes for flashing the tubular billet, a scheme has been proposed for upgrading the spindles of the main drive and the mechanism for installing the work rolls of the piercing mill No. 1 of TPA 350. The results are applicable to similar helical rolling mills. Keywords: firmware, billet, mill, pipe, uneven stroke, varying thickness, dynamics, drive, roll, oscillations, spindle, Cardan, hinge, moment of inertia, rigidity, drum, installation mechanism, stability.
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Elchalakani, Mohamed, Raphael Grzebieta, and Xiao-Ling Zhao. "Plastic Collapse Analysis of Slender Circular Tubes Subjected to Large Deformation Pure Bending." Advances in Structural Engineering 5, no. 4 (October 2002): 241–57. http://dx.doi.org/10.1260/136943302320974617.

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This paper presents a plastic mechanism analysis for thin-walled circular hollow section (CHS) tubes deforming in a multi-lobe or diamond collapse mode under large deformation pure bending. The fold formation process was such that the shell curvature flattened on the compression side transforming into a definite number of flat triangles attached to each other. The collapse proceeded progressively by folding about the base and sides of these triangular planes and over traveling hinge lines. The collapse mechanism was similar to the diamond crush mode. An existing kinematic model for an axially compressed thin-walled circular tube was modified to predict the collapse curve of a thin-walled tube under bending. Inextensional deformation and rigid plastic material behaviour were assumed in the derivation of the deformation energy. Ovalisation was observed during the test and its deformation energy was determined and found significant. An expression for the plastic collapse moment was obtained by equating the total energy absorbed in bending, rolling and ovalisation to the external work carried out during a given cycle of deformation. Comparisons of the predicted post-buckling moments and slopes of the collapse curves with those obtained from experiments carried out by the authors on cold-formed circular hollow sections show very good agreement.
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Peron-Pinvidic, Gwenn, and John Naliboff. "The exhumation detachment factory." Geology 48, no. 6 (April 13, 2020): 635–39. http://dx.doi.org/10.1130/g47174.1.

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Abstract Rifted margins include series of tectonic structures and basement geometries that record the thinning of continental crust and the birth of oceanic spreading centers. A consensus has been reached on the fact that the evolution is composite, including a phase of basement exhumation during which detachment faults play a major role. Rolling-hinge–type models are often advocated as the driving mechanism for basement exhumation, although the structural complexity of the exhumed regions frequently prohibits detailed analysis of the ways in which the faults form and evolve through time. Here, we place constraints on this process through an analysis of continental rifting numerical simulations, which we used to map fault network activity. The high-resolution models and mapping reveal a specific weak surface where detachments initiate at depth and terminate while migrating upward to the seafloor. This “detachment factory” model provides constraints on where, when, and how detachment faults originate in an exhumation system. Our model also predicts how abandoned detachments migrate off-axis with time, within the footwall and hanging wall, generating specific signals in geophysical data sets.
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Mudrov, Alexander P., Alexander G. Mudrov, Sergey M. Yakhin, and Gennady V. Pikmullin. "Research results of spatial mechanisms and directions of their application in farming machinery." BIO Web of Conferences 27 (2020): 00143. http://dx.doi.org/10.1051/bioconf/20202700143.

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The paper touches upon the issue of spatial hinge mechanisms with a special structure, developed on the basis of Bennett’s spatial four-bar linkage. The interest in the study of such mechanisms and their use in technology is constantly growing, since they are distinguished by a high efficiency, the transmission accuracy of motion law, the rigidity of the structure and the ability to transfer high loads. In addition, the hinges of the mechanisms are represented only by rotating pairs, which in the design of the hinge units allows the use of rolling bearings and reliably isolate the units from the external environment. The authors give several areas of application of mechanisms as basic and independent devices in technology, including the agro-industrial complex.
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Mudrov, Alexander P., Fanil F. Khabibullin, Gennadi V. Pikmullin, and Zurab D. Gurgenidze. "Synthesis of spatial five- and six-letter mechanisms with rotational pairs by the movement of the output link." BIO Web of Conferences 52 (2022): 00046. http://dx.doi.org/10.1051/bioconf/20225200046.

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The article discusses spatial mechanisms with rotational pairs that allow the movement of the output link or working body with a given accuracy while ensuring the necessary rigidity and reliability of the structure. Its durability is also significantly increased, energy losses are reduced, since all hinge assemblies (rotational kinematic pairs) are made on rolling bearings and are reliably isolated from the external environment. The article is also devoted to the synthesis (design) of functional spatial six-branch mechanisms with rotational pairs reproducing with a given accuracy the linear function of the change in the angle of rotation of the output link, provided it is fully rotatable. The objective function and dependencies necessary for the design of such mechanisms are obtained and an algorithm for solving this problem in CAD is developed.
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Promkotra, Sarunya. "Mechanisms of Microstructural Rearrangement on Two-Dimensional Aggregates under Compressive Stress." Defect and Diffusion Forum 312-315 (April 2011): 682–87. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.682.

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Two-dimensional (2D) colloidal aggregates of polystyrene microspheres 4 μm were experimentally modeled to study the rearranged mechanisms and compression behaviors at the air-liquid interface. The aggregated models occurred due to the interaction forces between particles. The combination of mechanical testing technique and the digital video microscopy had been developed to quantitatively analyze the compressive deformation of 2D aggregates. When the compressive forces were applied to the cluster, these forces were transmitted trough the aggregated network during compression. Solid-like mechanical properties of 2D aggregated cluster were examined. Deformation mechanisms occurred within the aggregated network which presented the particle rearrangements during yield. Elastic deformation had undergone the compressive elastic stress of the elastic loading. Rearrangement mechanisms found generally were rolling-hinge, sliding mechanisms and tensile failure for a small-scale deformation. Shear failure and stick-slip mechanisms caused a large-scale plastic deformation. However, across the yield point, the tensile failures were dominated. Rearrangement mechanisms of particles affected both elastic and plastic deformations.
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Yoon, Dukchan, Long Kang, Sajjad Manzoor, and Youngjin Choi. "The Improved DLR Wrist: Design and Analysis of 2-Degrees-of-Freedom Rotational Mechanism Using Spatial Antiparallelogram Linkages." Journal of Mechanical Design 143, no. 5 (November 17, 2020). http://dx.doi.org/10.1115/1.4048719.

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Abstract This article presents a kinematic analysis and modification of a wrist mechanism of the DLR robot arm, which is based on antiparallelogram linkages. This mechanism is modified to improve the range of motion (ROM), to reduce the parasitic motion, and to approximately perform the decoupled output motion. For these purposes, the elliptical rolling motion of an overconstrained antiparallelogram is first investigated in consideration of its structural modification. Also, a specific joint that has a relatively small movement is developed as a flexible hinge by further minimizing its angular displacement for design simplification. The axode analysis of the instantaneous screw axis for wrist movements is conducted to compare the rotational performance between the original and modified mechanisms. Moreover, their workspace qualities are evaluated through analyses of the workspace and the kinematic isotropy index. Finally, the improved DLR wrist of the final modification is prototyped, and its wide circumduction is demonstrated.
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Conference papers on the topic "Rolling-hinge mechanism"

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Hori, Kohei, Iwao Hayashi, and Nobuyuki Iwatsuki. "Determination of the Tooth Surface Friction Coefficient of a Pair of Mating Gears Based on the Distribution Along the Tooth Profile Precisely Measured With the Gravity Pendulum Method." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/ptg-14371.

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Abstract A new gravity pendulum method has been proposed in order to precisely measure the tooth surface friction coefficient of a pair of mating gears excluding the bearing loss. In this method, one of the mating gears, which is fixed on a gravity pendulum, is put on the other gear, which is fixed on the ground, and is freely oscillated. The center-to-center distance between the mating gears is kept constant with a flexure hinge mechanism in order to accurately reproduce the relative motion, including rolling and sliding, between the tooth surfaces of practical rotating gears. This method has a great advantage, in that the tooth surface friction co-efficient can be measured in a very small region of the tooth profile, because the initial oscillation amplitude can be set approximately one arc-degree. The distribution of the friction coefficients along the tooth surface has been precisely measured for the exact one pair-, inexact one pair-, and two pair-tooth engagements of an internal gear pair and an external gear pair. Also, the mean values of the distributed tooth surface friction coefficients are calculated by taking the specific sliding between the tooth surfaces into account, and are compared with each other.
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