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Identifying the Isomorphism of Kinematic Chains

REFERENCES 1. Chang Z. Zhang C., Yang Y., Wang Y. (2002), A New Method to Mechanism Kinematic Chain Isomorphism Identification, Mechanism and Machine Theory, 37, 411-417. 2. Cubillo J. P., Wan J . (2005), Comments on Mechanism Kinematic Chain Isomorphism Identification Using Adjacent Matrices, Mechanism and Machine Theory, 40, 131-139. 3. Ding H., Hou F., Kecskemethy A., Huang Z. (2011), Synthesis of a complete set of contracted graphs for planar non-fractionated simple-jointed kinematic chains with all possible DOFs, Mechanism and

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Kinematic Chains in Ski Jumping In-run Posture

References Dempster WT. The space requirements of the seated operator [Technical Report No. WADC-TR-55-159] . Dayton, OH: Wright Patterson Air Force Base; 1955 Di Fabio RP. Making jargon from kinetic and kinematic chains. J Orthop Sports Phys Ther , 1999; 29(3): 142-143 Dželalija M, Rausavljevič N, Jošt B. Relationship between jump length and the position angle in ski jumping. Kinesiol Slov , 2003; 9(1): 70-79 Escamilla RF, Fleisig GS, Zheng N, Barrentine SW, Wilk KE, Andrews JR

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Relationships between movements of the lower limb joints and the pelvis in open and closed kinematic chains during a gait cycle

Introduction Lots of athletic skills performed during practice or competition are initiated by the legs. Athletes either walk or run prior to executing specific skills ( Panariello, 1991 ). The gait is a complex movement which includes both the open and closed kinematic chain. Therefore, the gait can be influenced by many factors such as age, the activity level, muscle activity ( Bizovska et al., 2015 ; Cabell et al., 2013 ; Stastny et al., 2014 , 2015 ), injury ( Bunton et al., 1993 ) and disease ( Krawczyk et al., 2012 ; Marchewka and Chwala 2007

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Transfer of mechanical energy during the shot put

policis longus muscle ( Bartlett and Bussey, 2011 ). Therefore, performance of a throwing technique is impossible without power and conversely, high power cannot be generated without a good technique. This has to be the overriding principle in both training and performance diagnosis. In conclusion, the flow of mechanical energy throughout the kinematic chain is one of the most important criteria for evaluation of the shot put skills. The direction and value of the mechanical energy indicate the segments where energy is dissipated. The results in the shot put are

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Software for Graphical Investigation of Planar and Spatial Closed Kinematic Chains for Robots and Manipulators

Abstract

The aim of this paper is to present a developed computational program for computer graphical modelling of planar and spatial robots and manipulators closed kinematic chains. In order to demonstrate the functionality of the program two types of 5-bars and two types of 8-bars closed manipulators are used for simulation of the kinematic models. The basic mathematical calculations for visual representation of kinematic models are made, as well as calculations and visualisation of the manipulators zone of reachability frame by frame. The presented program can be used for analyzing closed kinematic chains, solving tasks from the real practice or for students training.

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Design of a Wood Cutting Machine

Abstract

The price of firewood has increased substantially in the last couple of years due to the high volume of export. The branches and smaller diameter pieces are considered leftovers and are not exportable, however they are suitable as firewood. Chainsaws are used to cut the larger diameter wood, but this way is not efficient for cutting up branches and smaller diameter wood pieces. In this paper we present the structure, working principle and the 3D model of a machine that can be used to chop smaller diameter wood branches in a simple and efficient way.

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Mechatronic Approaches for Functional Structural Synthesis of Mechanical Systems of Industrial Robots

. Maties. Considerations about the Mechatronical Transdisciplinary Knowledge Paradigm. - In: Proceedings of IEEE International Conference on Mechatronics, Malaga, Spain, 14-17 April 2009, 1-4. 25. Tischler, C. R., A. E. Samuel, H. K. Hunt. Kinematic Chains for Robot Hands. I. Orderly Number Synthesis. II. Kinematics Constrains, Classification, Connectivity and Actuation. - Mech. Mach. Theory, Vol. 30, 1995, No 8, 1193-1239.

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The Influence of X-Factor (Trunk Rotation) and Experience on the Quality of the Badminton Forehand Smash

point at the end of the backswing. After this, the RH moves forward until the point of impact with the shuttlecock, where the follow-through phase begins. Two factors dominate maximization of shuttlecock speeds during the forehand smash: 1) the forward swing speed determined by the angular velocity of the arm-racket kinematic chain, and 2) the length of that kinematic chain. From a fundamental physics standpoint, at any given angular velocity, a fully extended (longer) arm will generate higher shuttlecock velocities than a bent (shorter) arm. Thus, players are

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Accuracy Of Positioning And Orientation Of Effector Of Planar Parallel Manipulator 3RRR

Abstract

Parallel manipulator belongs to group of mechanisms with closed kinematic chains. This feature involves both advantages and disadvantages. The study examined the issue of accuracy of a planar system with three degrees of freedom, with revolute pairs, showing the effect of errors of the drives settings on effector positioning deviation. Enclosed is a numerical example for which analyzed the deviation in motion manipulator when going through the singular configuration. Based on the analysis was determined the area around the singular positions for which to obtain the orientation of the assumed accuracy is impossible.

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The Matlab Toolbox for Modeling Complex Mechanisms

Abstract

In the paper, a new version of the Matlab toolbox for modeling and simulation of any mechanisms consisting of open kinematic chains is presented. This tool renders it possible to define any manipulator described by Denavit-Hartenberg parameters and then connect the mechanisms created in this way into one complex mechanism. The package can be used for a realistic visualization of robot motion necessary in research, didactic process or during design of a production cell. Available functions render it possible to show a realistic model of a mechanism based on both default and user defined appearance. The toolbox also provides a set of tools for performing simultaneous simulations of many robots and other objects in their workspace. An example illustrating new features of the toolbox, presenting modeling and motion simulating of human upper limb is also attached.

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