Relevant bibliographies by topics / Rotational stiffness

Contents

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

Academic literature on the topic 'Rotational stiffness'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Rotational stiffness"

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Lu, Ya Fei, Qing Kun Zhou, De Jun Sheng, Da Peng Fan, and Zhi Yong Zhang. "Stiffness Analysis for Large-Travel Rotational Butterfly Pivot." Key Engineering Materials 455 (December 2010): 694–99. http://dx.doi.org/10.4028/www.scientific.net/kem.455.694.

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Butterfly pivot is a large-travel rotational flexure pivot, which can provide elastic support for the rotational shaft in several ten degrees. Because of the complex structure, stiffness calculation of butterfly pivot is always completed by the method of Finite Element Analysis (FEA), which is not suitable for parameter design and optimization. The serial structure of four-blade isosceles-trapezoid (FBIT)is proposed to simplified the complex structure of the butterfly pivot. The FBIT is analyzed and the theoretical formula of stiffness calculation for rotation stiffness is derived in detail based on the essential theory of Mechanics of Materials. Design and optimization of rotation stiffness for each element can be achieved easily with the obtained the theoretical formula of rotation stiffness. The total rotation stiffness of the whole butterfly pivot is calculated and the rotation stiffness comparison between using the theoretical method and by the method of FEA is performed. The error between the theoretical rotation stiffness and the result of the FEA is less than 10%. It is acceptable and without any influence on the validity of the work and concept presented in this paper.
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Ghafoor, Abdul, Jian S. Dai, and Joseph Duffy. "Stiffness Modeling of the Soft-Finger Contact in Robotic Grasping." Journal of Mechanical Design 126, no. 4 (July 1, 2004): 646–56. http://dx.doi.org/10.1115/1.1758255.

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This paper investigates the soft-finger contact by presenting the contact with a set of line springs based on screw theory, reveals the rotational effects, and identifies the stiffness properties of the contact. An elastic model of a soft-finger contact is proposed and a generalized contact stiffness matrix is developed by applying the congruence transformation and by introducing stiffness mapping of the line springs in translational directions and rotational axes. The effective stiffnesses along these directions and axes are hence obtained and the rotational stiffnesses are revealed. This helps create a screw representation of a six-dimensional soft-finger contact and produce an approach of analyzing and synthesizing a robotic grasp without resorting to the point contact representation. The correlation between the rotational stiffness, the number of equivalent point contacts and the number of equivalent contours is given and the stiffness synthesis is presented with both modular and direct approaches. The grasp thus achieved from the stiffness analysis contributes to both translational and rotational restraint and the stiffness matrix so developed is proven to be symmetric and positive definite. Case studies are presented with a two-soft-finger grasp and a three-soft-finger grasp. The grasps are analyzed with a general stiffness matrix which is used to control the fine displacements of a grasped object by changing the preload on the contact.
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Wang, Wei, and Xinming Qiu. "The Mechanical Properties of Origami Structure Determined by the Improved Virtual Crease Method." International Journal of Applied Mechanics 13, no. 01 (January 2021): 2150002. http://dx.doi.org/10.1142/s1758825121500022.

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The mechanical properties and deformation of Origami structures are studied in this paper. Usually, it is a coupling problem of crease rotation and shell deformation. Here, the creases are simplified as torsional springs, whose rotational stiffness [Formula: see text] is obtained by the experiment of compressing a creased shell. While the shells that may have large deformation are simplified as rigid plates connected by virtual creases, whose rotational stiffness is roughly expressed as bending stiffness divides width of the shell. Hence, a coupling factor [Formula: see text] is defined to evaluate the coupling effect of creases and shells. Implementing the obtained rotational stiffnesses of real and virtual creases into the expression of strain energy, an improved Virtual Crease Method (VCM) is proposed. By analyzing the bi-stability of creased shell and Miura-Ori structure, the accuracy and convergence of this improved VCM is proved.
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Ling, Samuel KK, Tun Hing Lui, Yan Sui Faan, Paulina WY Lui, and Wai Kit Ngai. "Post-traumatic elbow rotational stiffness." Shoulder & Elbow 6, no. 2 (March 3, 2014): 119–23. http://dx.doi.org/10.1177/1758573214524935.

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Melchers, R. E. "Rotational stiffness of shallow footings." Computers and Geotechnics 13, no. 1 (January 1992): 21–35. http://dx.doi.org/10.1016/0266-352x(92)90009-i.

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Button, Keith D., Paige Thornton, Jerrod E. Braman, Feng Wei, and Roger C. Haut. "The effect of rotational stiffness on ankle tibiocalcaneal motion and ligament strain during external rotation." Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology 230, no. 4 (August 1, 2016): 264–74. http://dx.doi.org/10.1177/1754337115623886.

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The rotational stiffness of footwear has been previously shown to have an effect on ankle kinematics and injury risk, but this relationship has not yet been modeled. The aim of this study was to derive equations from experimental data that were able to predict ankle kinematics under various torsional stiffness constraints and use these equations to estimate ligament strains. Three athletic tapes were tested for their ability to constrain the ankle during external rotation. Six subjects then performed a voluntary external foot rotation using the selected tape designs to constrain the ankle, as well as with no constraints. The motion of the calcaneus with respect to the tibia (tibiocalcaneal motion) from 0° to 15° of tibia rotation and predictive equations were determined to establish tibiocalcaneal rotation, eversion, and flexion as a function of gross tibia motion and tape stiffness. These predictive equations were then used to drive a computational model in which ankle ligament strains were determined at 15° of tibia rotation and for ankle constraint stiffness ranging from 0 to 30 N m/deg. The three tapes provided significantly different constraint stiffnesses during external foot rotation. There was no statistical effect of ankle constraint on the dorsiflexion response of the ankle (p = 0.461). In contrast, there was an effect of constraint stiffness on tibiocalcaneal external rotation (p < 0.001) and tibiocalcaneal eversion (p < 0.001). Results of the model simulation revealed the highest ligament strains in the anterior tibiotalar ligament and anterior tibiofibular ligament. Anterior tibiotalar ligament strain increased with increasing constraint stiffness, while there was little effect of constraint stiffness on anterior tibiofibular ligament strain. Results from this study could aid in the design of footwear, as well as the analysis of clinical injuries.
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Qin, Shujie, Na Yang, and Lu Dai. "Rotational Behavior of Column Footing Joint and Its Effect on the Dynamic Characteristics of Traditional Chinese Timber Structure." Shock and Vibration 2018 (July 5, 2018): 1–13. http://dx.doi.org/10.1155/2018/9726852.

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Chinese heritage timber buildings are of high historical and cultural values. The column footing joint is an important connection influencing the structural performance under dynamic load. The moment-rotation relationship of a column footing joint is studied and the effects of vertical load and ratio of column height to diameter on its rotational behavior are analyzed. A spring elements model is proposed to simulate the column footing joint and its stiffness matrix can be simplified to include only one stiffness parameter K with some assumptions. A component-based finite-element model of a timber pavilion is then developed to investigate the effect of rotational stiffness on the structural dynamic characteristics. Results show that a heavier vertical load may lead to larger ultimate moment capacity of the joint. The initial rotational stiffness and ultimate moment capacity decrease with increasing column height to diameter ratio. The modal frequency of the structure studied changes remarkably when the rotational stiffness K varies from 104 to 108 N▪m/rad. The column footing joints should be regarded as semirigid connections in the structural dynamic analysis. A field experiment was also conducted to further demonstrate that the rotational stiffness of column footing joint has notable influence on the dynamic characteristics of traditional Chinese timber structure.
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Wu, Guanglei, and Ping Zou. "Stiffness analysis and comparison of a Biglide parallel grinder with alternative spatial modular parallelograms." Robotica 35, no. 6 (February 8, 2016): 1310–26. http://dx.doi.org/10.1017/s0263574716000059.

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SUMMARYThis paper deals with the stiffness modeling, analysis and comparison of a Biglide parallel grinder with two alternative modular parallelograms. It turns out that the Cartesian stiffness matrix of the manipulator has the property that it can be decoupled into two homogeneous matrices, corresponding to the translational and rotational aspects, through which the principal stiffnesses and the associated directions are identified by means of the eigenvalue problem, allowing the evaluation of the translational and rotational stiffness of the manipulator either at a given pose or the overall workspace. The stiffness comparison of the two alternative Biglide machines reveals the (dis)advantages of the two different spatial modular parallelograms.
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Borzouie, J., J. G. Chase, G. A. MacRae, G. W. Rodgers, and G. C. Clifton. "Spectral Assessment of the Effects of Base Flexibility on Seismic Demands of a Structure." Advances in Civil Engineering 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/3984149.

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Base flexibility of structures changes and can increase the demands on structural elements during earthquake excitation. Such flexibility may come from the base connection, foundation, and soil under the foundation. This research evaluates the effects of column base rotational stiffness on the seismic demand of single storey frames with a range of periods using linear and nonlinear time history analysis. The base rotational stiffness ranges considered are based on previous studies considering foundation and baseplate flexibility. Linear and nonlinear spectral analyses show that increasing base flexibility generally increases frame lateral displacement and top moment of the column. Furthermore, moments at the top of the columns and the nonlinear base rotation may also increase with increasing base flexibility, especially for shorter period structures. Since many commonly used baseplate connections may be categorized as being semirigid, it is essential to design and model structures using realistic base rotational stiffness rather than simply use a fixed base assumption. The overall results also illustrate the range of increased seismic demand as a function of normalized rotational stiffness and structural period for consideration in design.
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Liu, Lang, Shusheng Bi, and Qizi Yang. "Stiffness characteristics of inner–outer ring flexure pivots applied to the ultra-precision instruments." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 13 (July 28, 2017): 2441–57. http://dx.doi.org/10.1177/0954406217721725.

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The inner-outer ring flexure pivot (IORFP), composed of three straight springs that cross each other in space, is studied in this work. First, to emphasize the study value of IORFP, qualitative comparison is applied to IORFP and some of most commonly used flexure pivots. Then an analytical model for the rotational stiffness of IORFP is developed based on the strain energy formulation of a beam flexure, and model applicability is provided as well. Analysis of stiffness, buckling load, and the nonlinear of moment–rotation relation is then carried out. Subsequently, the analytical model is verified by finite element analysis. After that, seven prototypes of IORFP are manufactured, and their rotational stiffnesses are tested. The results show that the analytical model can be used for analysis and designing of compliant mechanisms that contain IORFP. Finally, the study quantitatively compares stiffness characteristics and axis drift of IORFP and the generalized cross-spring pivot, indicating that the former significantly outperforms the latter. IORFP possesses excellent performances and can be widely used to supplant generalized cross-spring pivot in compliant mechanisms and ultra-precision instruments.
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Dissertations / Theses on the topic "Rotational stiffness"

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Bhabha, Hashim. "A new generation of high stiffness rotational moulding materials." Thesis, Manchester Metropolitan University, 2015. http://e-space.mmu.ac.uk/579563/.

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Polyethylene (PE), particularly linear medium density PE (LMDPE), is the most widely used thermoplastic in the rotational moulding (RM or rotomoulding) industry, possessing a balance between melt flow characteristics and mechanical properties best suited to the RM process relative to alternative thermoplastics. Reliance of the RM industry on LMDPE limits the application envelope for manufacturers due to the inherently low modulus of the material; manufacturers overcome this low modulus by increasing the wall thicknesses of their products which is costly and energy intensive. The addition of filler particles to PE as a method of modulus enhancement was considered a feasible alternative to increasing the wall thickness. The resulting composite material could down gauge part thickness and potentially expand the application envelope of RM. Phase 1 of this study observed the behaviour of RM grade PE’s with the introduction of filler particles in order to double the modulus (namely garnet, sand, cenospheres or fly-ash and the latter two combined). The PE/filler composites were mixed by dry blending or melt compounding, moulded and mechanically tested in tensile, flexural and Charpy impact mode. The aim of doubling the tensile modulus of rotomoulding grade PE was achieved by the melt compounded, rotomoulded PE/fly-ash composites. The introduction of maleic anhydride grafted linear low density polyethylene (MA-g-LLDPE) coupling agent also increased the modulus and tensile yield stress of LMDPE with the addition of fly-ash. However, the beneficial melt flow rate and impact toughness of PE decreased significantly with the addition of fly-ash. The latter was especially true for rotomoulded samples. As the RM industry typically uses finite element analysis (FEA) to numerically approximate the stress or deflection of load-bearing parts, phase 2 of this study focused upon developing numerical material properties for FEA of the new PE/fly-ash composites. Physical measurements from compression tests on rotomoulded PE/fly-ash safety steps were close to FEA approximations (confirming the practical value of the numerical materials data), except in the case of the unfilled and highest filled PE samples. The significant differences observed between physical measurements and FEA were probably due to complex factors such as the non-linear behaviour of PE and the variation in wall thickness of rotomoulded parts, highlighting the importance of properly understanding the finite element method (FEM) for RM.
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Sadler, Ashley Lauren. "Rotational Stiffness Models for Shallow Embedded Column-to-Footing Connections." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6752.

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Shallow embedded steel column connections are widely used in steel buildings; however, there is insufficient research about this connection type to understand the actual rotational stiffness that the connection provides. Shallow embedded steel columns are when a steel column is anchored to the foundation slab and then unreinforced concrete is poured around the base plate and the base of the column. This thesis seeks to further quantify the rotational stiffness available in this type of connection due to the added concrete and improve an existing model in order to represent the rotational stiffness. Existing data from two series of experiments on shallow embedded columns were used to validate and improve an existing rotational stiffness model. These two data sets were reduced in the same manner so that they could be compared to one another. In addition, the rotational stiffness for each test column was determined so they could be evaluated against the outputs of the model. The existing model was improved by evaluating each parameter in the model: the modulus of subgrade reaction, exposed column length, modulus of concrete for the blockout and the foundation slab, flange effective width, embedment depth, and effective column depth. It was determined that the model was sensitive to the subgrade reaction, modulus of concrete, embedment depth and effective column depth. The exposed length was not a highly sensitive parameter to the model. Flange effective width was determined to not be needed, especially when the other parameters were altered.
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Jones, Trevor Alexander. "Finite Element Modeling of Shallowly Embedded Connections to Characterize Rotational Stiffness." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5866.

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Finite element models were created in Abaqus 6.14 to characterize the rotational stiffness of shallowly embedded column-foundation connections. Scripts were programmed to automate the model generation process and allow study of multiple independent variables, including embedment length, column size, baseplate geometry, concrete modulus, column orientation, cantilever height, and applied axial load. Three different connection types were investigated: a tied or one part model; a contact-based model; and a cohesive-zone based model. Cohesive-zone modeling was found to give the most accurate results. Agreement with previous experimental data was obtained to within 27%. Baseplate geometry was found to affect connection stiffness significantly, especially at lower embedment depths. The connection rotational stiffness was found to vary only slightly with cantilever height for typical column heights. Results from varying other parameters are also discussed.
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Young, Alexander. "Validating Automotive Frame Torsion Stiffness Measurement Techniques." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470672143.

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Tryon, Joshua Edwin. "Simple Models for Estimating the Rotational Stiffness of Steel Column-to-Footing Connections." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5822.

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Despite the crucial role they play in transferring loads from the superstructure to the foundation, steel column-to-footing connections have received little attention in research. Though shallow embedded connections are typically characterized as pinned, studies have shown that they exhibit significant rotational stiffness. The objective of this thesis is to quantify the rotational stiffness of such connections. A method named the continuum model is developed by which the rotational stiffness of embedded connections may be calculated. Outputs from this model are compared with experimental data on steel connections embedded in concrete. The continuum model is shown to be capable of reasonably predicting the rotational stiffness of such connections. Results from the model were consistent with those of previous experimental studies that showed that embedment lengths greater than twice the column depth fail to significantly increase stiffness. Plots of rotational stiffness vs. embedment length developed from the continuum model are provided such that rotational stiffness may be calculated for any wide flange shape at any embedment length. Simplified equations provide a simpler way for engineers to estimate the same information.
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Hanks, Kevin N. "Rotational Strength and Stiffness of Shallowly Embedded Base Connections in Steel Moment Frames." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6261.

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Shallowly embedded column base connections with unreinforced block out concrete are a common method of connecting steel columns to their foundation. There has been little research done to accurately quantify the effects of this block out concrete on the connection strength and rigidity, and therefore there is nothing to aid the practicing engineer in accounting for this in structural analysis. Due to this lack of understanding, engineers have typically ignored the effects of shallow block out concrete in their analysis, presumably leading to a conservative design. Recent research has attempted to fill this gap in understanding. Several methods have been proposed that seek to quantify the effects of shallow block out concrete on a column base connection. Barnwell proposed a model that predicts the strength of a connection. Both Jones and Tryon used numerical modeling to predict the rotational stiffness of the connection. An experimental study was carried out to investigate the validity of these proposed models. A total of 8 test specimens were created at 2/3 scale with varying column sizes, connection details, and embedment depths. The columns were loaded laterally and cyclically at increasing displacements until the connection failed. The results show that the strength model proposed by Barnwell is reasonable and appropriate, and when applied to this series of physical tests produce predictions that have an observed/predicted ratio of between 0.95 to 1.39. The results also show that methods for estimating the rotational stiffness of the connection at the top of the block out concrete, as proposed by Jones and Tryon also produce reasonable values that had observed/predicted ratios of between 0.93 to 1.47. An alternative model for determining a design value for the rotational stiffness of a shallowly embedded column base plate is also proposed. When the embedment depth to column depth ratio is greater than 1.22, the connection is sufficiently rigid and at small deflections (less than 1% story drift) may be accurately modelled with infinite rotational stiffness (a "fixed" connection) at the base of the column.
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Verma, Amber. "Influence of Column-Base Fixity On Lateral Drift of Gable Frames." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/42686.

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In a typical light metal building, the structural members are designed for the forces and moments obtained from the wind drift analysis, which assumes pinned connections at the base. The pinned connections provide no moment at the base and have zero rotational stiffness. However, in reality every connection provides some restraint and has some rotational stiffness. Hence, by considering a modeling assumption of pinned condition, the actual behavior of the connection is not captured and this results in overestimation of lateral drifts and appearance of larger moments at the knee of the gable frames. Since the structural components are designed on the basis of these highly conservative results, the cost of the project increases. This thesis investigates the real behavior of the column base connection and tries to reduce the above stated conservatism by developing a computer program or â wizardâ to calculate the initial rotational stiffness of any column base connection. To observe the actual behavior of a column base connection under different load cases, a number of finite element models were created in SAP2000. Each finite element model of the column base connection contained base plate, column stub, anchor bolts and in some cases grout as its components. The model was mainly subjected to three load cases, namely gravity, wind and gravity plus wind. After performing many analyses, the influence of flexibility of each component on the flexibility of the connection was observed and a list of parameters was created. These parameters are the properties of above mentioned components which characterizes any column base connection. These parameters were then used as inputs to model any configuration of the column base connection in the developed wizard. The wizard uses OpenSees and SAP2000 to analyze the modeled configuration of the connection and provides values of the initial rotational stiffness and maximum bearing pressure for the provided loads. These values can be further used in any structural analysis which is done to calculate the lateral drift of a frame under lateral loads. This will also help in getting results which are less conservative than the results which one gets on assuming pinned condition at the base.
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Abrahamsson, Jenny, and Fleur Filip la. "The impact of connection stiffness on the global structural behavior in a CLT building : A combined experimental-numerical study." Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-105166.

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Cross Laminated Timber (CLT) has in recent years become a more important building material. This means that the demand for accurate calculation methods in building standards such as Eurocode 5 has increased. There is limited knowledge about the connections in CLT buildings which is an important part of a CLT structure. This thesis was therefore focused on investigating a wall-floor-wall type connection commonly found in platform type buildings.  An experimental and numerical study on typical wall-floor-wall connections was carried out in this thesis. In the experimental part 60 tests with 8 different configurations were conducted to investigate the influence of different parameters on the connection, moment capacity and rotational stiffness. During the tests the deformation of the specimens under four load levels were investigated. Compression tests were also performed on the specimens to determine the compressive strength and stiffness of the elements. In the numerical part two different models for the connection were created. One simplified model with rotational springs and one more complex model with compression springs. With these models the influence from the number of stories, span and thickness of the wall on the global behavior of a structure was investigated.  The result from this thesis shows that there is both moment capacity and rotational stiffness in the wall-floor-wall type connection that can be utilized in the design phase of a structure. This was proven by both the experimental and the numerical study. The parameters that influence the behavior of the connection most were the load level applied on the wall and the wall thickness. The model created in the numerical study showed great potential regarding the replication of the connection behavior observed in the experimental study.
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Pasha, Hasan G. "Estimation of Static Stiffnesses from Free Boundary Dynamic (FRF) Measurements." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416569956.

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Xin, Ming. "Kinematics, Dynamics, and Controller Design for the Contour Crafting Cartesian Cable (C4) Robot." Ohio University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1213223249.

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Book chapters on the topic "Rotational stiffness"

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Minor, Oscar, and Pavel Ryjáček. "Rotational Stiffness of Connections in a Historical Steel Railway Bridge." In RILEM Bookseries, 1082–89. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-99441-3_117.

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Yem, Vibol, and Hiroyuki Kajimoto. "A Fingertip Glove with Motor Rotational Acceleration Enables Stiffness Perception When Grasping a Virtual Object." In Human Interface and the Management of Information. Interaction, Visualization, and Analytics, 463–73. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-92043-6_39.

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Schabauer, Martin, Andreas Hackl, Wolfgang Hirschberg, and Cornelia Lex. "Experimental Investigation and Semi-physical Modelling of the Influence of Rotational Speed on the Vertical Tyre Stiffness and Tyre Radii." In Lecture Notes in Mechanical Engineering, 1889–98. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38077-9_214.

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Wang, Quanfeng. "Effect of the Rotation at the Base of Shear Wall on the Optimal Stiffness of Shear Wall in Tall Building." In Computational Mechanics ’88, 1789–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-61381-4_470.

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Won, J. H., H. D. Lee, A. R. Oh, and N. K. Jang. "Rotational stiffness between vertical and horizontal members of system supports." In Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges, 2493–98. CRC Press, 2018. http://dx.doi.org/10.1201/9781315189390-337.

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Lee, J., C. Chung, B. Kang, S. Ro, and J. Jang. "Effect of support rotational stiffness on tension estimation of short hanger ropes." In Bridge Maintenance, Safety, Management and Life Extension, 978–81. CRC Press, 2014. http://dx.doi.org/10.1201/b17063-142.

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Yang, Hui, and Lai Wang. "Progressive collapse analysis of space steel frames considering influence of joint rotational stiffness." In Advances in Civil Engineering and Building Materials IV, 385–88. CRC Press, 2015. http://dx.doi.org/10.1201/b18415-87.

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"MODE I BEHAVIOUR OF CONCRETE: INFLUENCE OF THE ROTATIONAL STIFFNESS OUTSIDE THE CRACK-ZONE." In Analysis of Concrete Structures by Fracture Mechanics, 27–36. CRC Press, 1990. http://dx.doi.org/10.1201/9781482289015-10.

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Fang, D. L., C. T. Mueller, J. Brütting, C. Fivet, and J. Moradei. "Rotational stiffness in timber joinery connections: Analytical and experimental characterizations of the Nuki joint." In Structures and Architecture: Bridging the Gap and Crossing Borders, 229–36. CRC Press, 2019. http://dx.doi.org/10.1201/9781315229126-28.

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Rageh, Ahmed, Daniel Linzell, Samantha Lopez, and Saeed Eftekhar Azam. "Robust Output Only Health Monitoring of Steel Railway Bridges." In Advances in Computer and Electrical Engineering, 24–41. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2772-6.ch002.

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This chapter extends application of a framework proposed by the authors (73, 74) for automated damage detection using strain measurements to study feasibility of using sensors that can measure accelerations, tilts, and displacements. The study utilized three-dimensional (3D) finite element models of double track, riveted, steel truss span, and girder bridge span under routine train loads. The chapter also includes three instrumentation schemes for each bridge span (65) to investigate the applicability of the framework to other bridge systems and sensor networks. Connection damage was simulated by reducing rotational spring stiffness at member ends and various responses were extracted for each damage scenario. The methodology utilizes Supervised Machine Learning to automatically determine damage location (DL) and intensity (DI). Simulated experiments showed that DLs and DIs were detected accurately for both spans with various structural responses and using different instrumentation plans.
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Conference papers on the topic "Rotational stiffness"

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Young, Bruce A., and Richard J. Olson. "System Stiffness and Restraint Effects on Circumferential Crack Opening Displacements: A Rotational Stiffness Approach." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45404.

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Current crack opening displacement (COD) solutions for leak-before-break (LBB) analyses assume the ends of the cracked pipe, which is subjected to remote bending and internal pressure, are free to rotate. However, in plant piping systems, the pressure induced bending and imposed rotations are restrained, because the ends of the pipe are constrained by the rest of the piping system and other components. Hence, existing evaluation procedures, theoretically overestimate the COD values of a circumferential through-wall crack (TWC) in a piping system. These overestimations comprise one of the uncertainties in an LBB analysis, as it leads to an under-prediction of the leakage-size-crack length of a postulated leaking TWC for a prescribed leakage detection limit in a plant, and thus, results in a non-conservative estimation of the crack stability from an LBB perspective. Historical efforts on the effects of restraint on COD have focused on a restraint distance from the crack to restrain the rotation of the pipe. This study provides a fundamentally different approach in that the underlying theory develops a relationship between the apparent rotational stiffness of a pipe with unrestrained ends and the material modulus as a function of crack length and pipe geometry. Thus, the local system stiffness from a plant structural model can be used to modify the unrestrained value of COD.
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Fan Fei, Jesse A. Roll, and Xinyan Deng. "Design principle of wing rotational hinge stiffness." In 2015 IEEE International Conference on Robotics and Automation (ICRA). IEEE, 2015. http://dx.doi.org/10.1109/icra.2015.7139306.

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Shodhan Rao, R. Carloni, and S. Stramigioli. "A novel energy-efficient rotational variable stiffness actuator." In 2011 33rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2011. http://dx.doi.org/10.1109/iembs.2011.6092016.

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Mazon, G., and M. A. Diaz. "Linear and Rotational Structural Stiffness of Mooring Systems." In International Conference on the Design and Construction of Wind Farm Vessels 2014. RINA, 2014. http://dx.doi.org/10.3940/rina.wfv.2014.08.

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Groothuis, S. S., G. Rusticelli, A. Zucchelli, S. Stramigioli, and R. Carloni. "The vsaUT-II: A novel rotational variable stiffness actuator." In 2012 IEEE International Conference on Robotics and Automation (ICRA). IEEE, 2012. http://dx.doi.org/10.1109/icra.2012.6224868.

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Garifullin, M., N. Vatin, T. Jokinen, and M. Heinisuo. "Numerical solution for rotational stiffness of RHS tubular joints." In The 2nd International Conference on Engineering Sciences and Technologies. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315393827-16.

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Leemans, Joost R., Charles J. Kim, Werner W. P. J. van de Sande, and Just L. Herder. "Unified Rotational and Translational Stiffness Characterization of Compliant Shell Mechanisms." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85251.

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Compliant shell mechanisms utilize spatially curved thin-walled structures to transfer or transmit force, motion or energy through elastic deformation. To design with spatial mechanisms designers need comprehensive characterization methods, while existing methods fall short of meaningful comparisons between rotational and translational degrees of freedom. This paper presents two approaches, both of which are based on the principle of virtual loads and potential energy, utilizing properties of screw theory, Plücker coordinates and an eigen-decomposition, leading to two unification lengths that can be used to compare and visualize all six degrees of freedom directions and magnitudes of compliant mechanisms in a non-arbitrary physically meaningful manner.
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Minjuan He, Hua Tian, and Yi Zhao. "Experimental study and rotational stiffness analysis of bolted timber connection." In 2011 International Conference on Multimedia Technology (ICMT). IEEE, 2011. http://dx.doi.org/10.1109/icmt.2011.6002765.

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Shang, Lei. "Rotational-Inertia-and-Voltage-Stiffness Compensator to Improve Grid Voltage Dynamic." In 2019 IEEE Sustainable Power and Energy Conference (iSPEC). IEEE, 2019. http://dx.doi.org/10.1109/ispec48194.2019.8974861.

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Castelli, Kevin, Marco Gavioli, Yevheniy Dmytriyev, and Hermes Giberti. "Mechanical Design and Development of a Continuous Rotational Variable Stiffness Actuator." In 2021 3rd International Congress on Human-Computer Interaction, Optimization and Robotic Applications (HORA). IEEE, 2021. http://dx.doi.org/10.1109/hora52670.2021.9461398.

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Reports on the topic "Rotational stiffness"

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STRESS RESPONSE AND INITIAL STIFFNESS OF SIDE PLATE CONNECTIONS TO WCFT COLUMNS. The Hong Kong Institute of Steel Construction, September 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.9.

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To study the mechanism of load transfer in double-side-plate connections between I-beams and wall-type concrete-filled steel tubular columns, a pseudo-static experiment and finite element analysis were conducted for two full-scaled specimens. The results revealed that the primary load was transmitted along an S-shaped path in the side plate, and the primary strain occurred in an X-shaped region between the left and right steel beam flanges. The shear force in the steel beam web was transmitted first to the side plate centre and then to the joint area, where the side plate, steel tube web, and concrete all resisted the internal force. Based on principal component methods, a calculation formula was established for initial rotational stiffness that comprehensively considers the influence of the tensions, compression, and shear deformation of the cover plate, side plate, and web. Comparing this formula with an existing model showed that the proposed formula is suitable for new types of side plate joints. Moreover, it can accurately calculate the initial rotational stiffness of the joint, thus providing a reliable basis for future engineering design.
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