Kinematics and Dynamics

The main aim of this study was to evaluating the various relationships of the identified biomechanical variables towards the performance of spin bowling and evaluating the contribution of identified biomechanical variables and construction of predictive model. Five interuniversity level leg-spin bowlers were recruited from LNIPE, India, and their bowling actions were captured by three video cameras, in a field setting. A value of α = 0.05 was used for all tests as the criterion to determine the presence or absence of significance. Pearson’s product moment correlation coefficient (r) was used for evaluating the various relationships of the selected variables towards the performance of spin bowling. Significant relationship was found between the Angle of Release (r = 0.965, P < 0.05), Average Velocity (r = 0.541, P < 0.05), Elbow joint Right (r = -0.392, P < 0.05), Hip Joint left (r = 0.402, P < 0.05), and Shoulder joint left (r = -0.383, P < 0.05). Multiple Linear Regr...

Some iterative matrix relations for the geometric, kinematic and dynamic analysis of a Delta parallel robot are established in this paper. The prototype of this manipulator is a three degree of freedom spatial mechanism, which consists of a system of parallel chains. Supposing that the position and the translation motion of the platform are known, an inverse dynamic problem is solved using the virtual powers method. Finally, some recursive matrix relations and some graphs for the moments and the powers of the three active couples are determined.

In this project we are brougth to construct a unicycle robot to control it. using the cinematic modeling of the unicycle robot under MATLAB / SIMULINK we succeeded to characterize and enslave our system while controlling it in speed and CAP. Then, using the graphical interface V-REP we developed the prototype of the robot. Then we succeeded in communicating the environment MatlAb / Simulink with the graphical interface V-REP, this allowed us to control our robo
----------------------------------------------------------------------------------------------------
Si vous avez des questions sur ce travail, n'hésitez pas à me contacter sur mon adresse mail.
If you have any questions about this project, do not hesitate to contact me on my email address

e-mail : iliass.elmouderrib@gmail.com

good reading!

Course is intended for Undergraduate Mechanical Engineering students involving on Understanding Kinematics of Mechanisms, simple mechanism study,  Velocity and acceleration analysis of mechanisms, Problem solving on Belt drives, Rope drives, Using Graphical analysis of generating Cam Profiles, Study of all types of gear drives and problem solving on spur gears, study on control and regulation of Governors.

Student use of vectors in introductory mechanics. [American Journal of Physics 72, 460 (2004)]. Sergio Flores, Stephen E. Kanim, Christian H. Kautz. Abstract. Most students' initial exposure to physics is in the context of kinematics and dynamics. ...

The main aim of this study was to evaluating the various relationships of the identified biomechanical variables towards the performance of spin bowling and evaluating the contribution of identified biomechanical variables and construction of predictive model. Five interuniversity level leg-spin bowlers were recruited from LNIPE, India, and their bowling actions were captured by three video cameras, in a field setting. " value of = 0.05 was used for all tests as the criterion to determine the presence or absence of significance. Pearsonns product moment correlation coefficient rr was used for evaluating the various relationships of the selected variables towards the performance of spin bowling. Significant relationship was found between the Angle of Release (r = 0.965, P < 0.05), Average Velocity (r = 0.541, P < 0.05), Elbow joint Right (r =-0.392, P < 0.05), Hip Joint left (r = 0.402, P < 0.05), and Shoulder joint left (r =-0.383, P < 0.05). Multiple Linear Regression was used for evaluating the contribution of identified biomechanical variables and construction of predictive model. The regression equation was reliable as the value of R 2 was 0.945. The two variables selected in that regression equation explain 94.5% of the total variability in lateral deviation of ball was good. Since F-value for that regression model was highly significant, the model was reliable. This study provides further understanding of the biomechanical variables are associated with skilled performance in cricket leg-spin bowling, which coaches should consider when training less-skilled performers.

We report Mopra Australia Telescope National Facility (ATNF), Anglo-Australian Telescope and Atacama Submillimeter Telescope Experiment observations of a molecular clump in Carina, BYF73 = G286.21+0.17, which give evidence of large-scale gravitational infall in the dense gas. From the millimetre and far-infrared data, the clump has a mass of ~2 × 104Msolar, luminosity of ~2-3 × 104Lsolar and diameter of ~0.9 pc. From radiative transfer modelling, we derive a mass infall rate of ~3.4 × 10-2Msolaryr-1. If confirmed, this rate for gravitational infall in a molecular core or clump may be the highest yet seen. The near-infrared K-band imaging shows an adjacent compact HII region and IR cluster surrounded by a shell-like photodissociation region showing H2 emission. At the molecular infall peak, the K imaging also reveals a deeply embedded group of stars with associated H2 emission. The combination of these features is very unusual, and we suggest that they indicate the ongoing formation ...

The isolated horizon formalism recently introduced by Ashtekar et al. aims at providing a quasi-local concept of a black hole in equilibrium in an otherwise possibly dynamical spacetime. In this formalism, a hierarchy of geometrical structures is constructed on a null hypersurface. On the other side, the 3+13+1 formulation of general relativity provides a powerful setting for studying the spacetime dynamics, in particular gravitational radiation from black hole systems. Here we revisit the kinematics and dynamics of null hypersurfaces by making use of some 3+13+1 slicing of spacetime. In particular, the additional structures induced on null hypersurfaces by the 3+13+1 slicing permit a natural extension to the full spacetime of geometrical quantities defined on the null hypersurface. This four-dimensional point of view facilitates the link between the null and spatial geometries. We proceed by reformulating the isolated horizon structure in this framework. We also reformulate previous works, such as Damour's black hole mechanics, and make the link with a previous 3+13+1 approach of black hole horizon, namely the membrane paradigm  . We explicit all geometrical objects in terms of 3+13+1 quantities, putting a special emphasis on the conformal 3+13+1 formulation. This is in particular relevant for the initial data problem of black hole spacetimes for numerical relativity. Illustrative examples are provided by considering various slicings of Schwarzschild and Kerr spacetimes.

A strategy for adaptive control and energetic optimization of aerobic fermentors was implemented, with both air flow and agitation speed as manipulated variables. This strategy is separable in its components: control, optimization, estimation. We optimized parameter’s estimation (from the usual KLa correlation) using sinusoidal excitation of air flow and agitation speed. We have implemented parameter’s estimation trough recursive least squares algorithm with forgetting factor. We carried separate essays on control, optimization and estimation algorithms. We carried our essays using an original computational simulation environment, with noise and delay generating facilities for data sampling and filtering.

Our results show the convergence and robustness of the estimation algorithm used, improved with use of both forgetting factor and KLa dead-band facilities. Control algorithm used in our work compares favorably with PID using the integrated area criteria for deviation between oxygen molarity and critical molarity (set point). Optimization algorithm clearly reduces energetic consumption, respecting critical molarity. Integration of control, optimization and adaptive algorithms was implemented, but future work is needed for stability. Methods were defined and implemented for stability improvement. We have implemented data acquisition and computer manipulation of air flow and agitation speed for actual fermentors.

The network model approach is used for deriving a complete mathematical model which includes des the kinematic and dynamic properties of the Bendix wrist mechanism. According to the approach, first,the mathematical models of each part of the mechanism are formulated. Then, theschematic diagram which indicates the interconnections of the components forming the system is drawn. Finally, thesystem graph is depicted, which yields all the necessary information about the system. In this publication, in addition to the system graph for the gear-pairs in the mechanism, a new graph has been developed which shows the angular velocity and torque relations among the gears. An illustrative example is given for the application of the complete model obtained.

Resumen Se hace uso de las Clases Interactivas Demostrativas (CID) para la enseñanza del concepto del movimiento de una partícula bajo velocidad constante y sus correspondientes gráficos posición-tiempo y velocidad-tiempo. Las clases se han usado dentro del primer curso de física para estudiantes de ingeniería, como una actividad introductoria al estudio de la cinemática dentro del curso. La demostración y discusión de la situación experimental planteada se realiza en clase mediante el uso del software para análisis de videos llamado TRACKER, el cual muestra el análisis de la partícula en movimiento a velocidad constante y sus correspondientes gráficas posición y velocidad a través del tiempo. Se enfatiza también la noción de velocidad y su relación con la gráfica posición-tiempo a través del concepto matemático de la pendiente de una línea recta. Palabras clave: Velocidad constante, aprendizaje activo, graficas de movimiento. Abstract The Interactive Lecture Demonstrations (ILD) are used for the teaching of the concept of a particle under a constant velocity and their corresponding graphs position-time and velocity-time. The classes have been used in the first semester of the physics course for engineering students, as an introductory learning activity of kinematics topic into the course. The demonstration and discussion of the stablished experimental situation is made through the analysis in class using the video analysis software TRACKER, which shows the analysis of a particle under constant speed motion and their corresponding graphs position and velocity through time. In this investigation it is emphasized the velocity concept and the relation between the position-time graph with the mathematical concept of straight line slope.