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Journal articles on the topic 'Variable kinematics'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Najd, Jamal, Enrico Zappino, Erasmo Carrera, Walid Harizi, and Zoheir Aboura. "A Variable Kinematic Multifield Model for the Lamb Wave Propagation Analysis in Smart Panels." Sensors 22, no. 16 (2022): 6168. http://dx.doi.org/10.3390/s22166168.

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The present paper assessed the use of variable kinematic two-dimensional elements in the dynamic analysis of Lamb waves propagation in an isotropic plate with piezo-patches. The multi-field finite element model used in this work was based on the Carrera Unified Formulation which offers a versatile application enabling the model to apply the desired order theory. The used variable kinematic model allowed for the kinematic model to vary in space, thereby providing the possibility to implement a classical plate model in collaboration with a refined kinematic model in selected areas where higher o

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2

Yu, Yao, and Wu Hongtao. "The Kinematics Analysis of a Novel 3-DOF Cable-Driven Wind Tunnel Mechanism." Journal of Robotics 2010 (2010): 1–7. http://dx.doi.org/10.1155/2010/609391.

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The kinematics analysis method of a novel 3-DOF wind tunnel mechanism based on cable-driven parallel mechanism is provided. Rodrigues' parameters are applied to express the transformation matrix of the wire-driven mechanism in the paper. The analytical forward kinematics model is described as three quadratic equations using three Rodridgues' parameters based on the fundamental theory of parallel mechanism. Elimination method is used to remove two of the variables, so that an eighth-order polynomial with one variable is derived. From the equation, the eight sets of Rodridgues' parameters and co

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Ribeiro Branco, Guilherme, Luciana De Michelis Mendonça, Renan Alves Resende, and Felipe Pivetta Carpes. "Does the Retül System provide reliable kinematics information for cycling analysis?" Journal of Science and Cycling 11, no. 3 (2022): 76–84. http://dx.doi.org/10.28985/1322.jsc.15.

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The Retül Vantage system is a popular tool to assess dynamic positioning of cyclists. Despite of using a low sampling rate (18 Hz) to record position data, Retül measures shows a moderate to very high correlation with data from gold-standard tridimensional camera systems reaching higher sampling rates, but its reliability has not been tested. Here we assess the reliability of the Retül Vantage system for kinematic assessment of cyclists. This cross-sectional study had two phases. Phase 1 included a survey with certified Retül bike fitters to select the most common variables used in cycling kin

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Sun, Shu Hua. "Study on the 4-PTT Variable Topology Parallel Chinese Massage Manipulator." Applied Mechanics and Materials 215-216 (November 2012): 33–36. http://dx.doi.org/10.4028/www.scientific.net/amm.215-216.33.

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In the paper, virtual prototype parallel chinese massage manipulator was designed based on the technique kinematics and dynamics analysis in Chinese massage technique and on the 4-PTT variable topology parallel mechanism.At the same time, for an example the pushing method,simulation analysis for the kinematic and dynamic of the virtual prototype were studied.

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Baran, Eray A., Ozhan Ozen, Dogacan Bilgili, and Asif Sabanovic. "Unified Kinematics of Prismatically Actuated Parallel Delta Robots." Robotica 37, no. 9 (2019): 1513–32. http://dx.doi.org/10.1017/s0263574719000092.

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SummaryThis paper presents a unified formulation for the kinematics, singularity and workspace analyses of parallel delta robots with prismatic actuation. Unlike the existing studies, the derivations presented in this paper are made by assuming variable angles and variable link lengths. Thus, the presented scheme can be used for all of the possible linear delta robot configurations including the ones with asymmetric kinematic chains. Referring to a geometry-based derivation, the paper first formulates the position and the velocity kinematics of linear delta robots with non-iterative exact solu

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Herák, D., V. Šleger, R. Chotěborský, K. Houška, and E. Janča. "Kinematical characteristic of mechanical frictional variable speed drive." Research in Agricultural Engineering 52, No. 2 (2012): 61–68. http://dx.doi.org/10.17221/4881-rae.

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The paper describes a new system of mechanical spherical conical friction drive. In the present a row of simple friction, belt, chain, wave and differential variable speed drives is published. For the required range of speed variation they are altogether unfit. The currently used power transmissions are of low efficiency (60&ndash;70%). Therefore the better power transmission efficiency is required. The possibility of multicontact power transmission appears as the most suitable principle of the power transmission. Using the designed function model, which was made according to the small tra

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Ardestani, Marzieh M., Christopher E. Henderson, Gordhan Mahtani, Mark Connolly, and T. George Hornby. "Locomotor Kinematics and Kinetics Following High-Intensity Stepping Training in Variable Contexts Poststroke." Neurorehabilitation and Neural Repair 34, no. 7 (2020): 652–60. http://dx.doi.org/10.1177/1545968320929675.

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Background and Purpose. Previous studies suggest that individuals poststroke can achieve substantial gains in walking function following high-intensity locomotor training (LT). Recent findings also indicate practice of variable stepping tasks targeting locomotor deficits can mitigate selected impairments underlying reduced walking speeds. The goal of this study was to investigate alterations in locomotor biomechanics following 3 different LT paradigms. Methods. This secondary analysis of a randomized trial recruited individuals 18 to 85 years old and >6 months poststroke. We compared change

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Mortimer, S. T., and M. A. Swan. "Variable kinematics of capacitating human spermatozoa*." Human Reproduction 10, no. 12 (1995): 3178–82. http://dx.doi.org/10.1093/oxfordjournals.humrep.a135882.

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9

Krasovsky, Tal, Patrice L. Weiss, Oren Zuckerman, Avihay Bar, Tal Keren-Capelovitch, and Jason Friedman. "DataSpoon: Validation of an Instrumented Spoon for Assessment of Self-Feeding." Sensors 20, no. 7 (2020): 2114. http://dx.doi.org/10.3390/s20072114.

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Clinically feasible assessment of self-feeding is important for adults and children with motor impairments such as stroke or cerebral palsy. However, no validated assessment tool for self-feeding kinematics exists. This work presents an initial validation of an instrumented spoon (DataSpoon) developed as an evaluation tool for self-feeding kinematics. Ten young, healthy adults (three male; age 27.2 ± 6.6 years) used DataSpoon at three movement speeds (slow, comfortable, fast) and with three different grips: “natural”, power and rotated power grip. Movement kinematics were recorded concurrently

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Yeşilyaprak, C., and Z. Aslan. "Kinematics of M-Type Giant Semi-Regular Variables from the Hipparcos Catalogue." Publications of the Astronomical Society of Australia 25, no. 2 (2008): 63–68. http://dx.doi.org/10.1071/as07015.

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AbstractThe kinematics of M-type (O-rich) giant semi-regular (SR) variable stars were examined. They were grouped with respect to their relative parallax errors (επ/π) in order to study the stars having relatively better parallax, and with the period limit (70 d). The spatial and velocity distributions were examined and the results were compared with the results of irregular (L) and Mira-type variables. It was found that M-type giant SR variables are distributed similarly to thin-disc stars and form a kinematically homogeneous group. When the kinematic properties of M-type giant SR variables w

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Romero-Franco, Natalia, María del Carmen Ortego-Mate, and Jesús Molina-Mula. "Knee Kinematics During Landing: Is It Really a Predictor of Acute Noncontact Knee Injuries in Athletes? A Systematic Review and Meta-analysis." Orthopaedic Journal of Sports Medicine 8, no. 12 (2020): 232596712096695. http://dx.doi.org/10.1177/2325967120966952.

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Background: Although knee kinematics during landing tasks has traditionally been considered to predict noncontact knee injuries, the predictive association between noncontact knee injuries and kinematic and kinetic variables remains unclear. Purpose: To systematically review the association between kinematic and kinetic variables from biomechanical evaluation during landing tasks and subsequent acute noncontact knee injuries in athletes. Study Design: Systematic review; Level of evidence, 2. Methods: Databases used for searches were MEDLINE, LILACS, IBECS, CINAHL, SPORTDiscus, SCIELO, IME, Sci

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Zhao, Wen De, Fan Kai Kong, and Kai Jie Xu. "Kinematics Simulation of the Disc-Rod Blade Variable Vector Propeller." Key Engineering Materials 450 (November 2010): 572–76. http://dx.doi.org/10.4028/www.scientific.net/kem.450.572.

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With the structure more compact and more lightweight, the variable vector propeller can produce propulsive force from all directions, which has important application value as a special purpose to meet underwater propulsion device. As the structure is complex in common and also with some special requirements in design and manufacture, the disc-rod blade adjustment mechanism is a concept meets the requirements. Taking the disc-rod blade adjustment mechanism as the basic design scheme, its structural analysis and basic kinematic analysis were carried out, and then the kinematics simulation was co

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Mahl, Tobias, Alexander Hildebrandt, and Oliver Sawodny. "A Variable Curvature Continuum Kinematics for Kinematic Control of the Bionic Handling Assistant." IEEE Transactions on Robotics 30, no. 4 (2014): 935–49. http://dx.doi.org/10.1109/tro.2014.2314777.

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Zhao, Jing-Shan, Song-Tao Wei, and Xiao-Cheng Sun. "Computational Dynamics of Multi-Rigid-Body System in Screw Coordinate." Applied Sciences 13, no. 10 (2023): 6341. http://dx.doi.org/10.3390/app13106341.

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This paper investigates the kinematics and dynamics of multi-rigid-body systems in screw form. The Newton–Euler dynamics equations are established in screw coordinates. All forces and torques of the multi-rigid-body system can be solved straightforwardly since they are explicit in the form of screw coordinates. The displacement and acceleration are unified in matrix form, which associates the kinematics and dynamics with variable of velocity. A one-step numerical algorithm only is needed to solve the displacements and accelerations. As a result, all absolute displacements, velocities, and acce

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15

Wang, Yu-Xin, and Yi-Ming Wang. "Inverse kinematics of variable geometry parallel manipulator." Mechanism and Machine Theory 40, no. 2 (2005): 141–55. http://dx.doi.org/10.1016/j.mechmachtheory.2004.07.003.

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16

Naccarato, Frank, and Peter Hughes. "Inverse kinematics of variable-geometry truss manipulators." Journal of Robotic Systems 8, no. 2 (1991): 249–66. http://dx.doi.org/10.1002/rob.4620080207.

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17

Kolpashchikov, Dmitrii, Olga Gerget, and Viacheslav Danilov. "FABRIKx: Tackling the Inverse Kinematics Problem of Continuum Robots with Variable Curvature." Robotics 11, no. 6 (2022): 128. http://dx.doi.org/10.3390/robotics11060128.

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A continuum robot is a unique type of robots which move because of the elastic deformation of their bodies. The kinematics of such robots is typically described using constant curvature assumption. Such an assumption, however, does not completely describe the kinematics of a real-life continuum robot. As a result, variable curvature assumptions describe the kinematics of the continuum robot better, however, they are more complicated to formulate and work with. In particular, the existing methods of solving the inverse kinematics problem of multisection continuum robots with variable curvature

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18

Zappino, Enrico, Guohong Li, and Erasmo Carrera. "Node-dependent kinematic elements for the dynamic analysis of beams with piezo-patches." Journal of Intelligent Material Systems and Structures 29, no. 16 (2018): 3333–45. http://dx.doi.org/10.1177/1045389x18798942.

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This article extends the use of one-dimensional elements with node-dependent kinematics to the dynamic analysis of beam structures with piezo-patches. Node-dependent kinematics allows the kinematic assumptions to be defined individually on each finite element node, leading to finite element models with variable nodal kinematics. Derived from Carrera unified formulation, node-dependent kinematics facilitates the mathematical refinement to an arbitrary order at any desirable region on the nodal level while keeping the compactness of the formulation. As an ideal approach to simulate structures wi

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Kim, Tae-in, Robert T. Hudspeth, and W. Sulisz. "CIRCULATION KINEMATICS IN NONLINEAR LABORATORY WAVES." Coastal Engineering Proceedings 1, no. 20 (1986): 30. http://dx.doi.org/10.9753/icce.v20.30.

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A weakly nonlinear solution is presented for the two-dimensional wave kinematics forced by a generic wavemaker of variable-draft. The solution is valid for both piston and hinged wavemakers of variable draft that may be double articulated. The second-order propagating waves generated by a planar wave board are composed of two components; viz., a Stokes second-order wave and a second-harmonic wave forced by the wavemaker which travels at a different speed. A previously neglected time-independent solution that is required to satisfy a kinematic boundary condition on the wavemaker as well as a mi

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20

Vo, Dai Q., Hormoz Marzbani, Mohammad Fard, and Reza N. Jazar. "Variable caster steering in vehicle dynamics." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 232, no. 9 (2017): 1270–84. http://dx.doi.org/10.1177/0954407017728650.

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When a car is cornering, its wheels usually lean away from the centre of rotation. This phenomenon decreases lateral force, limits tyre performance and eventually reduces the vehicle lateral grip capacity. This paper proposes a strategy for varying caster in the front suspension, thereby altering the wheel camber to counteract this outward inclination. The homogeneous transformation was utilised to develop the road steering wheel kinematics which includes the wheel camber with respect to the ground during a cornering manoeuvre. A variable caster scheme was proposed based on the kinematic analy

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Sharkov, O. V., and A. V. Kalinin. "Analytical Evaluation of the Velocity Fluctuation of Pulse Continuously Variable Transmissions." Proceedings of Higher Educational Institutions. Маchine Building, no. 5 (746) (May 2022): 35–42. http://dx.doi.org/10.18698/0536-1044-2022-5-35-42.

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Pulse continuously variable transmissions allow to change gradually the speed and power characteristics of machine drives in motion and under load. When operating such transmissions, the transforming mechanism has the most complex kinematics. It transforms the rotational motion of the input link into the vibrational motion of intermediate links with different amplitudes and frequencies. The article considers the problem of analytical research of the kinematics of the transforming mechanism of a pulsed continuously variable transmission with six free-running mechanisms. To solve the problem, a

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22

BOSTAN, ION, SERGIU MAZURU, and SERGHEI SCATICAILOV. "Processes generating non-standard profiles variable convexconcav of precessional gear." Journal of Engineering Sciences and Innovation 5, no. 12 (2020): 111–22. http://dx.doi.org/10.56958/jesi.2020.5.2.2.

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"The main issues are discussed in this thread: design, implementation and operation of the technological processes of manufacturing gears, mathematical modeling of the kinematics of the processing to evaluate the accuracy of the tooth profiling, presented the research methodology, will identify a number of technological factors that affect the quality indicators of precessional transmission. Scientific issues have been investigated: elaboration of the kinematic concept of the technological process of generating by rolling of precession gears with variable and non-standard profile with peripher

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Bramah, Christopher, Stephen J. Preece, Niamh Gill, and Lee Herrington. "Is There a Pathological Gait Associated With Common Soft Tissue Running Injuries?" American Journal of Sports Medicine 46, no. 12 (2018): 3023–31. http://dx.doi.org/10.1177/0363546518793657.

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Background: Previous research has demonstrated clear associations between specific running injuries and patterns of lower limb kinematics. However, there has been minimal research investigating whether the same kinematic patterns could underlie multiple different soft tissue running injuries. If they do, such kinematic patterns could be considered global contributors to running injuries. Hypothesis: Injured runners will demonstrate differences in running kinematics when compared with injury-free controls. These kinematic patterns will be consistent among injured subgroups. Study Design: Contro

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Zhao, Yanchun, Shiqiang Hu, and Yongsheng Yang. "Inverse kinematics for the variable geometry truss manipulator via a Lagrangian dual method." International Journal of Advanced Robotic Systems 13, no. 6 (2016): 172988141666677. http://dx.doi.org/10.1177/1729881416666779.

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This article studies the inverse kinematics problem of the variable geometry truss manipulator. The problem is cast as an optimization process which can be divided into two steps. Firstly, according to the information about the location of the end effector and fixed base, an optimal center curve and the corresponding distribution of the intermediate platforms along this center line are generated. This procedure is implemented by solving a non-convex optimization problem that has a quadratic objective function subject to quadratic constraints. Then, in accordance with the distribution of the in

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Guo, Lei, Liang Zhao, Yuan Song, and Jikun Hu. "Design and control of a variable structure robot." International Journal of Advanced Robotic Systems 17, no. 1 (2020): 172988142090360. http://dx.doi.org/10.1177/1729881420903606.

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Because wheeled mobile robots have so many applications in warehouse logistics, improving their ability to adapt to the environment has been the subject of extensive research. To enhance the traffic and obstacle avoidance capabilities of wheeled robots, a wheeled mobile robot with a transformable chassis is proposed in this article for use in an automated warehouse. The robot can not only move in all directions but also change its chassis structure according to the specific warehouse environment. First, the robot structure is designed, and the motion modes of the robot are analyzed. After kine

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Harris, Jeffrey Clark, Sunil Mohanlal, Marissa Yates, and Stephan Grilli. "3D DEPTH-LIMITED BREAKING WAVES OVER VARIABLE BATHYMETRY IN FULLY NON-LINEAR POTENTIAL FLOW." Coastal Engineering Proceedings, no. 38 (May 29, 2025): 99. https://doi.org/10.9753/icce.v38.waves.99.

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A new method of modeling 3D depth-limited breaking waves is proposed and implemented in a fully non-linear potential flow model based on the boundary element method. The method is implemented in three steps: (1) identification of breaking onset using the kinematic B criterion; (2) application of damping pressure in the dynamic free surface condition, function of crest kinematics; and (3) a breaking termination criterion to stop this dissipation. A comparison with an experimental study of breaking waves over variable bathymetry is further studied.

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Pascual Huerta, Javier, Juan Manuel Ropa Moreno, Kevin A. Kirby, Francisco Javier García Carmona, and Angel Manuel Orejana García. "Effect of 7-Degree Rearfoot Varus and Valgus Wedging on Rearfoot Kinematics and Kinetics During the Stance Phase of Walking." Journal of the American Podiatric Medical Association 99, no. 5 (2009): 415–21. http://dx.doi.org/10.7547/0990415.

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Background: The scientific evidence behind the mechanical function of foot orthoses is still controversial. Research studies that have investigated the kinematic effect of foot orthoses on the lower extremity have shown variable results, with orthoses causing either no significant change or a small significant change in foot kinematics. Methods: The right limbs of 12 healthy asymptomatic individuals were studied in three walking conditions: barefoot, with a 7° rearfoot varus wedge, and with a 7° rearfoot valgus wedge. Kinematic and kinetic variables measured were the foot progression angle, th

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Jen, S. C., and D. Kohli. "Automated Formation of Closed Form Kinematic Displacement Polynomials for Open Loop Planar and Spatial Chains." Journal of Mechanical Design 117, no. 1 (1995): 83–88. http://dx.doi.org/10.1115/1.2826121.

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A new numerical approach for determining inverse kinematic polynomials of manipulators is presented in this paper. Let the inverse kinematic polynomial of a manipulator in one revolute joint variable θi be represented by gnTn + gn-1Tn-1 + gn-2Tn-2 + • + g1T + go = 0. T = tanθi/2 and go, g1...gn are polynomial type functions of hand position variables. The coefficients g are expressed in terms of undetermined coefficients and hand position variables. Then the undetermined coefficients are evaluated by using direct kinematics and the solutions of sets of linear equations, thus determining coeffi

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Antunes da Costa Moraes, Anderson, Manuela Brito Duarte, Eduardo Veloso Ferreira, et al. "Comparison of inertial records during anticipatory postural adjustments obtained with devices of different masses." PeerJ 11 (July 12, 2023): e15627. http://dx.doi.org/10.7717/peerj.15627.

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Background Step initiation involves anticipatory postural adjustments (APAs) that can be measured using inertial measurement units (IMUs) such as accelerometers. However, previous research has shown heterogeneity in terms of the population studied, sensors used, and methods employed. Validity against gold standard measurements was only found in some studies, and the weight of the sensors varied from 10 to 110 g. The weight of the device is a crucial factor to consider when assessing APAs, as APAs exhibit significantly lower magnitudes and are characterized by discrete oscillations in accelerat

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Ashley-Ross, M. "METAMORPHIC AND SPEED EFFECTS ON HINDLIMB KINEMATICS DURING TERRESTRIAL LOCOMOTION IN THE SALAMANDER DICAMPTODON TENEBROSUS." Journal of Experimental Biology 193, no. 1 (1994): 285–305. http://dx.doi.org/10.1242/jeb.193.1.285.

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The kinematics of the hindlimb during terrestrial treadmill locomotion in Dicamptodon tenebrosus were compared between larval and metamorphosed individuals at different speeds. Coordinates of marker points on the salamander's midline, pelvic girdle and left hindlimb were digitized from high-speed videos (200 fields s-1). These yielded kinematic variables describing trunk flexion, pelvic girdle rotation, femoral protraction/retraction and knee flexion/extension. A three-way analysis of variance tested for mean differences among individuals, speeds and metamorphic stages for each variable. No si

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Li, Dian, Sheng Guo, and Haibo Qu. "A novel multiple working modes parallel mechanism with variable workspace." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 1 (2018): 211–24. http://dx.doi.org/10.1177/0954406218806016.

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In this paper, a novel three-degrees-of-freedom multiple working modes parallel mechanism with variable workspace is proposed. Several studies including kinematic and prescribed trajectory planning are performed. First, the degrees of freedom of mechanism's two working modes are calculated based on screw theory. A prototype made by 3D printer also has been developed. Then, the inverse/forward kinematics and Jacobian matrices are obtained. The workspace and singularity are also analyzed, which show that the proposed parallel mechanism possesses singularity-free internal workspace. Finally, a wo

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Wang, Hong, Yu Zhang, Xiangyun Zeng, et al. "Searching for Variable Stars in the Open Cluster NGC 2355 and Its Surrounding Region." Astronomical Journal 164, no. 2 (2022): 40. http://dx.doi.org/10.3847/1538-3881/ac755a.

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Abstract We have investigated the variable stars in the field surrounding NGC 2355 based on the time-series photometric observation data. More than 3000 CCD frames were obtained in the V band spread over 13 nights with the Nanshan One-meter Wide-field Telescope. We have detected 88 variable stars, containing 72 new variable stars and 16 known variable stars. By analyzing these light curves, we classified the variable stars as follows: 26 eclipsing binaries, 52 pulsating stars, four rotating variables, and six unclear type-variable stars for which their periods are much longer than the time bas

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Grafinger, M. "USING KINEMATIC ANALYSIS TO DEVELOP A NEW TOOTH SYSTEM FOR GEARINGS WITH VARIABLE SHAFT ANGLE." Proceedings of the Design Society: DESIGN Conference 1 (May 2020): 2505–10. http://dx.doi.org/10.1017/dsd.2020.8.

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AbstractThe belt units of an omnidirectional treadmill need to be connected for a continuous rotational transmission with variating axes angle. Torus gearing is not appropriate due to kinematic reasons, therefore a crown gearing with cone-shaped teeth is proposed. Parameter analysis on a virtual kinematics model show that depending on the cone angle, overlaps occur at different axis angles. Consequently, the shape of the teeth is modified with tip and foot relief and optimized so that no overlapping of the teeth occurs while a large path of contact is provided.

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Malosio, Matteo, Francesco Corbetta, Francisco Ramìrez Reyes, Hermes Giberti, Giovanni Legnani, and Lorenzo Molinari Tosatti. "On a Two-DoF Parallel and Orthogonal Variable-Stiffness Actuator: An Innovative Kinematic Architecture." Robotics 8, no. 2 (2019): 39. http://dx.doi.org/10.3390/robotics8020039.

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Variable-Stiffness Actuators are continuously increasing in importance due to their characteristics that can be beneficial in various applications. It is undisputed that several one-degree-of-freedom (DoF) solutions have been developed thus far. The aim of this work is to introduce an original two-DoF planar variable-stiffness mechanism, characterized by an orthogonal arrangement of the actuation units to favor the isotropy. This device combines the concepts forming the basis of a one-DoF agonist-antagonist variable-stiffness mechanism and the rigid planar parallel and orthogonal kinematic one

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Costa, Luís, Miguel F. Gago, Darya Yelshyna, et al. "Application of Machine Learning in Postural Control Kinematics for the Diagnosis of Alzheimer’s Disease." Computational Intelligence and Neuroscience 2016 (2016): 1–15. http://dx.doi.org/10.1155/2016/3891253.

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The use of wearable devices to study gait and postural control is a growing field on neurodegenerative disorders such as Alzheimer’s disease (AD). In this paper, we investigate if machine-learning classifiers offer the discriminative power for the diagnosis of AD based on postural control kinematics. We compared Support Vector Machines (SVMs), Multiple Layer Perceptrons (MLPs), Radial Basis Function Neural Networks (RBNs), and Deep Belief Networks (DBNs) on 72 participants (36 AD patients and 36 healthy subjects) exposed to seven increasingly difficult postural tasks. The decisional space was

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Deliceoğlu, Gökhan, Erdal Arı, Erkan Tortu, and Ali Keleş. "An analysis of sprint kinematics: the effects of step distance, contact and flight time on sprint performance." Pedagogy of Physical Culture and Sports 28, no. 4 (2024): 256–65. http://dx.doi.org/10.15561/26649837.2024.0402.

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Background and Study Aim. Sprinting performance is crucial in many sports, and even marginal improvements in sprint mechanics can provide significant competitive advantages. The aim of this study is to examine the influence of step distance, contact time, and flight time on sprint speed. Material and Methods. The study was conducted on 26 athletes (20 males and 6 females). Body composition was measured using a bioimpedance analysis device. Sprint kinematics (step distance, contact time, and flight time) and sprint speed parameters were assessed using an optical measurement system during a 30-m

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Iskandar, Fathur Rokhman, Imam Sucahyo, and Meta Yantidewi. "Penerapan Metode Invers kinematik Pada Kontrol Gerak Robot Lengan Tiga Derajat Bebas." Inovasi Fisika Indonesia 9, no. 2 (2020): 64–71. http://dx.doi.org/10.26740/ifi.v9n2.p64-71.

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AbstrakRobot didefinisikan sebagai suatu instrumen yang terdiri dari perangkat keras dan perangkat lunak yang berfungsi untuk membantu pekerjaan manusia. Salah satu pekerjaan yang dapat dilakukan oleh robot adalah proses pemindahan barang dari satu tempat ke tempat yang lain. Sistem gerak robot lengan diadaptasi dari sistem gerak lengan manusia yang memiliki sendi atau disebut dengan joint dan link sebagai penghubung antar joint. Pergerakan robot lengan dapat ditentukan dengan menggunakan metode trial-error atau yang biasa dikenal dengan forward kinematik. Namun, metode ini dinilai lebih memak

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Fain, AuraLea, Ayden McCarthy, Bradley C. Nindl, Joel T. Fuller, Jodie A. Wills, and Tim L. A. Doyle. "IMUs Can Estimate Hip and Knee Range of Motion during Walking Tasks but Are Not Sensitive to Changes in Load or Grade." Sensors 24, no. 5 (2024): 1675. http://dx.doi.org/10.3390/s24051675.

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The ability to estimate lower-extremity mechanics in real-world scenarios may untether biomechanics research from a laboratory environment. This is particularly important for military populations where outdoor ruck marches over variable terrain and the addition of external load are cited as leading causes of musculoskeletal injury As such, this study aimed to examine (1) the validity of a minimal IMU sensor system for quantifying lower-extremity kinematics during treadmill walking and running compared with optical motion capture (OMC) and (2) the sensitivity of this IMU system to kinematic cha

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Sun, Shu Hua. "Dynamic Analysis and Simulation of Variable Topology Parallel Tire Building Drum Mechanism." Advanced Materials Research 415-417 (December 2011): 2040–43. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.2040.

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A new type of parallel tire building drum mechanism is proposed. The structure of the mechanism is analyzed, and the degree of freedom is calculated .The solid model of the mechanism is established by UG, and then the kinematics of the mechanism is analyzed through the establishment of the Lagrange Dynamic Equations. The kinematics simulation is conducted using software code of ADAMS.

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Giunta, Gaetano, Domenico Andrea Iannotta, Levent Kirkayak, and Marco Montemurro. "Buckling Analysis of Variable-Angle Tow Composite Plates through Variable Kinematics Hierarchical Models." Journal of Composites Science 8, no. 8 (2024): 320. http://dx.doi.org/10.3390/jcs8080320.

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Variable-Angle Tow (VAT) laminates can improve straight fiber composites’ mechanical properties thanks to the application of curvilinear fibers. This characteristic allows one to achieve ambitious objectives for design and performance purposes. Nevertheless, the wider design space and the higher number of parameters result in a more complex structural problem. Among the various approaches that have been used for VAT study, Carrera’s Unified Formulation (CUF) allows one to obtain multiple theories within the same framework, guaranteeing a good compromise between the results’ accuracy and the co

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Kohli, D., and M. Osvatic. "Inverse Kinematics of General 6R and 5R,P Serial Manipulators." Journal of Mechanical Design 115, no. 4 (1993): 922–31. http://dx.doi.org/10.1115/1.2919288.

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In this paper we present a solution to the inverse kinematics problems for serial manipulators of general geometry. The method is presented in detail as it applies to a 6R manipulator of general geometry. The equations used are derived using power products and dialytic elimination. In doing this, all variables except one, a tangent half angle of a joint variable, can be eliminated. The result is a 16 by 16 matrix in which all terms are linear in the suppressed variable. The unique design of this matrix allows the suppressed variable to be solved as an eigenvalue problem. Substituting these val

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Sender, Piotr. "Influence of the abrasive grain trajectory on the machining of thin-walled cylinder liners of internal combustion engines with variable kinematics of honing." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 12 (2018): 634–41. http://dx.doi.org/10.24136/atest.2018.468.

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Honing with variable kinematics has a number of advantages in comparison to traditional honing [1-19], such as less tool wear [12, 13], lower processing temperature [13], better surface quality [12, 13] and less deviation of cylindricity [13]. The article discusses the influence of the variable kinematics on the machining process.

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Khamis, Sam, Barry Danino, Dror Ovadia, and Eli Carmeli. "Correlation between Gait Asymmetry and Leg Length Discrepancy—What Is the Role of Clinical Abnormalities?" Applied Sciences 8, no. 10 (2018): 1979. http://dx.doi.org/10.3390/app8101979.

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Reducing the effect of leg length discrepancy (LLD) on gait abnormalities while other abnormal conditions such as spasticity, joint contractures or weak muscle strength are exhibited is challenging. This study aimed to evaluate the impact of mild LLD on lower limb biomechanics, on participants with anatomic LLD with and without other clinical abnormalities. A motion capture system was utilized on 32 participants to measure lower limb kinematics and dynamic leg length (DLL) throughout the gait cycle, calculated as the absolute distance from the hip joint center, either to the heel, ankle joint

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K.Rajavelu. "Artificial Intelligence Techniques Applied to Control and Identify Parameters in variable DOF Robotic Manipulators for Industrial Automation." Tuijin Jishu/Journal of Propulsion Technology 44, no. 4 (2023): 913–20. http://dx.doi.org/10.52783/tjjpt.v44.i4.946.

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An industrial robot manipulator must be able to translate its static collection of joint angles into position coordinates before calculating the end effect's appropriate positioning with forward kinematics.A robotic manipulator has now become an integral part of industrial automation, greatly reducing the need for human labour, increasing the accuracy of work as well as reducing the time required to accomplish tasks.Each rotation must be controlled using servomotor feedback. MATLAB® Robotics Toolbox is used to verify the kinematic model for the activation of three revolving joints.The purpose

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López, Antonio, Juan Alvarez, and Diego Álvarez. "Walking Turn Prediction from Upper Body Kinematics: A Systematic Review with Implications for Human-Robot Interaction." Applied Sciences 9, no. 3 (2019): 361. http://dx.doi.org/10.3390/app9030361.

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Prediction of walking turns allows to improve human factors such as comfort and perceived safety in human-robot interaction. The current state-of-the-art suggests that upper body kinematics can be used for that purpose and contains evidence about the reliability and the quantitative anticipation that can be expected from different variables. However, the experimental methodology has not been consistent throughout the different works and the related data has not always been given in an explicit form, with different studies containing partial, complementary or even contradictory results. In this

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SINGH, C. P. "EARLY HOMOGENEOUS UNIVERSE WITH VARIABLE COSMOLOGICAL CONSTANT: KINEMATICS TESTS." International Journal of Modern Physics A 22, no. 13 (2007): 2415–31. http://dx.doi.org/10.1142/s0217751x07036609.

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A spatially homogeneous cosmological model with flat geometry filled with perfect fluid is studied in the presence of a variable cosmological "constant." Einstein's field equations are solved by using the "gamma-law" equation of state p = (γ-1)ρ, where the adiabatic parameter γ, varies with cosmic time. The functional form of γ, which is assumed to be the function of scale factor R as proposed by Carvalho, is used to describe the early evolution of universe with variable cosmological "constant." A unified description of early universe is given in which an inflationary phase is followed by radi

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Xu, Younan, and Fengfeng Xi. "A Real-Time Method for Solving the Forward Kinematics of a Tripod With Fixed-Length Legs." Journal of Manufacturing Science and Engineering 128, no. 1 (2005): 204–12. http://dx.doi.org/10.1115/1.2114928.

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This paper presents a real-time method for solving the forward kinematics of a tripod with fixed-length legs. The basic idea is to model the problem at hand based on a spatial four-bar linkage through which three sliding legs can be interrelated by choosing one link as a driving variable and other two links as driven variables. As a result, the original multivariable nonlinear problem with three variables can be reduced to one variable problem. A complete approach is provided to solve the unitary nonlinear programing problem. This includes a method for solving the implicit functions in terms o

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Bamdad, Mahdi, and M. Mehdi Bahri. "Kinematics and Manipulability Analysis of a Highly Articulated Soft Robotic Manipulator." Robotica 37, no. 5 (2019): 868–82. http://dx.doi.org/10.1017/s0263574718001376.

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SummaryRecently, the idea of applying “jamming” of appropriate media has been exploited for a novel continuum robot design. It is completed by applying vacuum in a robot structure filled with granular media. The backbone deformation and motion are achieved by controlling the fluid pressure. A jammable robotic manipulator does not certainly follow constant curvature during bending, that is, gravitational loads cause section sag. The kinematics describes the deformation of continuum manipulators. This formulation is expected to facilitate additional synthesis and analysis on workspace. This pape

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Wu, Zhe, Xigui Wang, and Zhiqin Zhang. "Numerical Analysis of a TCR Adaptive to Different Tree Diameters for Unstructured Forest Environment: A TCR of Variable Diameter with Different Tree Diameters." Journal of Robotics 2023 (February 16, 2023): 1–12. http://dx.doi.org/10.1155/2023/8229356.

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This paper proposes the optimal design and simulation analysis of a robot for tree-climbing, which has the ability to climb up the tree trunk to adapt to different tree diameter changes. In an unstructured forest environment, considering that the Tree-Climbing Robot (TCR) may collide with branches, reducing the success rate of tree climbing, the mechanical structure and movement strategy to avoid branches are predesigned. The presented TCR mimics several design principles that have been adapted to arboreal animals, including claw-hand grasping and climbing gait movements, and is optimally desi

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Wang, Chenxu, Dajian Yi, Wenhui Zhang, et al. "Improved Sliding Mode Variable Structure Control of Robot Manipulators with Flexible Joints based on Singular Perturbation." Highlights in Science, Engineering and Technology 85 (March 13, 2024): 1265–74. http://dx.doi.org/10.54097/prx5zp34.

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This paper discusses the kinematics analysis method of six link mechanism based on virtual prototype technology and Adams. Firstly, the kinematics mathematical model of the six-bar linkage is deduced. Then, based on the design and development process of virtual prototype technology, the virtual prototype model of the six-bar press is established in ADAMS software. Finally, the kinematics simulation analysis is carried out for the model. The proposed method provides a reference for the parametric and optimal design analysis of the multi bar linkage of the mechanical press.

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