Computer Simulation of the Loads on the ACL During Backward Falls Based on an Open Kinematic Chain Model

2009 ◽  
pp. 254-254-16 ◽  
Author(s):  
JD Webster ◽  
CA Brown
Keyword(s):  
Computer Simulation ◽  
Kinematic Chain ◽  
Chain Model

RICH DYNAMICS OF A TIME-DELAYED FOOD CHAIN MODEL

2006 ◽  
Vol 14 (03) ◽  
pp. 387-412 ◽  
Author(s):  
ALAKES MAITI ◽  
G. P. SAMANTA
Keyword(s):  
Computer Simulation ◽  
Time Delay ◽  
Functional Response ◽  
Food Chain ◽  
Complex Dynamics ◽  
Chain Model ◽  
Dynamical Behaviors ◽  
Discrete Time Delay ◽  
Food Chain Model ◽  
Practical Implications

Complex dynamics of a tritrophic food chain model is discussed in this paper. The model is composed of a logistic prey, a classical Lotka-Volterra functional response for prey-predator and a ratio-dependent functional response for predator-superpredator. Dynamical behaviors such as boundedness, stability and bifurcation of the model are studied critically. The effect of discrete time-delay on the model is investigated. Computer simulation of various solutions is presented to illustrate our mathematical findings. How these ideas illuminate some of the observed properties of real populations in the field is discussed and practical implications are explored.

The Non-Recursive Newton-Euler Formulation of the Dynamic Equation for Robotic Mechanisms

1986 ◽  
Vol 10 (1) ◽  
pp. 16-20
Author(s):  
You-Sun Li ◽  
Anastasios Kessaris
Keyword(s):  
Computer Simulation ◽  
Dynamic Equation ◽  
Kinematic Chain ◽  
Open Loop ◽  
Dynamic Equations ◽  
Design Stage ◽  
Real Time Control ◽  
Time Control ◽  
Dynamic Computer Simulation ◽  
New Formulation

A new formulation of the dynamic equations of an open loop kinematic chain is presented in this paper. This new method is based upon the composite link system concept and the dynamic equations are derived using vectorial analysis. In comparison with conventional methods, the method presented in this paper is more efficient and more explicit, hence it is applicable to both real time control and dynamic computer simulation during the design stage of new robotic mechanisms.

Development of an Enterprise Supply Chain Model for Naval Warship Construction

2003 ◽  
Vol 19 (02) ◽  
pp. 105-115
Author(s):  
Rex Wallen ◽  
Veasey Wilson
Keyword(s):  
Computer Simulation ◽  
Supply Chain ◽  
Simulation Models ◽  
Management Tool ◽  
Second Phase ◽  
Successful Implementation ◽  
Chain Model ◽  
Support Functions ◽  
Newport News ◽  
Supply Chain Model

This paper presents issues critical to the development and successful implementation of computer simulation models for ship component manufacturing within a naval shipyard environment. More specifically, it addresses the need for a supply chain approach to developing simulation models for use as a management tool. The problem domain is the naval shipbuilding industry, which is different from industries associated with traditional manufacturing. Due to the tremendous number of components associated with naval warship construction and the extreme length of the build cycle, managing such an enterprise presents a formidable challenge. As Northrop Grumman Newport News strives to be a lean enterprise, managers will need new tools to address the lean initiatives of the many shops and construction areas within their domain. In this paper, it is suggested that the application of computer simulation using a component supply chain approach could provide management with a powerful tool to improve efficiency. A three-phased approach for the development of an enterprise supply chain model is presented. In the first phase, individual simulation models are developed for manufacturing and material support functions. The second phase addresses the linking of the models into small model networks. In the third phase, additional models are developed and more sophisticated networking strategies are utilized.

A Motion Analysis for one D.O.F. Anthropomorphic Finger Mechanism

1998 ◽  
Author(s):  
Giorgio Figliolini ◽  
Marco Ceccarelli
Keyword(s):  
Computer Simulation ◽  
Motion Analysis ◽  
Kinematic Chain ◽  
Open Loop ◽  
Kinematic Structure ◽  
Design Considerations ◽  
Human Finger ◽  
And Control

Abstract A novel kinematic structure of a tendon-driven mechanism is proposed for an anthropomorphic finger mechanism of artificial hands. The kinematic structure is composed by three links as the three phalanges of a human finger and they are moved independently by means of suitable endless tendons. The three d.o.f.s of the proposed open-loop kinematic chain have been appropriately reduced to only one in order to simplify the actuation and control of the finger mechanism. A motion analysis has been carried out by using the polode method to obtain a suitable algorithm for computer simulation. The grasp performances of the proposed new anthropomorphic finger mechanism have been investigated and some design considerations have been pointed out.

Computer Simulation of Sleep EEG Patterns with a Markov Chain Model

1966 ◽  
pp. 335-355 ◽  
Author(s):  
William W. K. Zung ◽  
Thomas H. Naylor ◽  
Daniel T. Gianturco ◽  
William P. Wilson
Keyword(s):  
Computer Simulation ◽  
Markov Chain ◽  
Markov Chain Model ◽  
Sleep Eeg ◽  
Chain Model

THE SIGNIFICANCE OF FLOW-MODIFIED PERMITTIVITY: A NEW MODEL AND COMPUTER SIMULATION OF ELECTRORHEOLOGY

2002 ◽  
Vol 16 (17n18) ◽  
pp. 2562-2568 ◽  
Author(s):  
YUE HU ◽  
EE-YENN E. LIN ◽  
UJITHA M. DASSANAYAKE
Keyword(s):  
Computer Simulation ◽  
Electric Field ◽  
Tilt Angle ◽  
Applied Electric Field ◽  
Dipole Moments ◽  
Chain Model ◽  
High Shear ◽  
Shear Rates ◽  
High Shear Rates ◽  
Wide Range

We propose a model that takes into account the effect of flow-modified permittivity on electrorheology (ER). Due to dielectric relaxation, a shear flow causes the induced particle dipole moments in an ER fluid to tilt in a direction away from the direction of the applied DC electric field. Results from our computer simulation indicate that at high shear rates this misalignment (tilt angle) between the particle dipole moments and the applied electric field plays a crucial role in producing ER effects. By choosing particle-fluid dielectric and conductive mismatches to optimize the tilt angle, our simulation produces ER effects at much higher shear rates than those in earlier simulation work, even though there is no chain structure at these high shear rates. The increase in shear stress due to the applied electric field in our simulation is nearly constant over the wide range of shear rates examined, in qualitative agreement with experimental results. In addition, our model generates results that agree with earlier simulation work at low shear rates, where the particle dipole moments are essetially aligned with the field and the chain model is adequate.

scholarly journals A SIX-LINK KINEMATIC CHAIN MODEL OF HUMAN BODY USING KANE'S METHOD

2012 ◽  
Vol 09 ◽  
pp. 59-67 ◽  
Author(s):  
A. S. RAMBELY ◽  
FAZROLROZI
Keyword(s):  
Motion Capture ◽  
Human Body ◽  
Inverse Dynamics ◽  
Force Plate ◽  
Kinematic Chain ◽  
Chain Model ◽  
Upper Arm ◽  
Kinematic Data ◽  
Kane’S Method ◽  
Kane's Method

A biomechanics model of six-link kinematic chain of human body is developed by using Kane's method. The kinematic data comprise of six segments; foot, calf, thigh, trunk, upper arm and forearm, are obtained through data collection of walking, running and jumping using the Vicon Nexus system. The motion capture system uses 12 Vicon MX-3+ cameras and 12 Vicon MX-F40 cameras, two DV (50 Hz) cameras and a force plate (100 Hz). Inverse dynamics approach is used to obtain the unknown value of torques produced by joint segments during walking, running and jumping activities. The results show that the largest value of torques produced occurs at the foot segment.

scholarly journals Non-Linear Lumped-Parameter Modeling of Planar Multi-Link Manipulators with Highly Flexible Arms

Robotics ◽  
2018 ◽  
Vol 7 (4) ◽  
pp. 60 ◽  
Author(s):  
Ivan Giorgio ◽  
Dionisio Del Vescovo
Keyword(s):  
Control Strategy ◽  
Kinematic Chain ◽  
Rigid Bodies ◽  
Chain Model ◽  
Joint Angles ◽  
Lumped Parameter ◽  
Bending Resistance ◽  
Parabolic Trajectory ◽  
Lumped Parameter Modeling ◽  
Flexible Arms

The problem of the trajectory-tracking and vibration control of highly flexible planar multi-links robot arms is investigated. We discretize the links according to the Hencky bar-chain model, which is an application of the lumped parameters techniques. In this approach, each link is considered as a kinematic chain of rigid bodies, and suitable springs are added in order to model bending resistance. The control strategy employed is based on an optimal input pre-shaping and a feedback of the joint angles to treat the effects of undesired disturbances. Some numerical examples are given to show the potentialities of the proposed control, and a comparison with a standard collocated Proportional-Derivative (PD) control strategy is performed. In particular, we study the cases of a linear and a parabolic trajectory with a polynomial time law chosen to minimize the onset of possible vibrations.

scholarly journals COMPUTER MODELING IN MSC ADAMS/VIEW AS PART OF A MODERN APPROACH TO THE DESIGN OF MECHANICAL SYSTEMS OF ROBOTS

2021 ◽  
pp. 23-32
Author(s):  
Darina Hroncova
Keyword(s):  
Computer Simulation ◽  
Degrees Of Freedom ◽  
Kinematic Chain ◽  
Graphical Form ◽  
Position Vector ◽  
Modern Approach ◽  
Freedom Of Movement ◽  
Angular Deflection ◽  
Angular Velocities ◽  
4 Degrees Of Freedom

The presented paper deals with the use of computer simulation in the design of a robot model with 4 degrees of freedom of movement. The MSC Adams program is used in the computer simulation, and the use of the Matlab program is also shown. The robot's mechanism is an open kinematic chain. During kinematic analysis, attention is paid to solving the direct problem of kinematics in MSC Adams and in Matlab. The result of the solution is the calculated trajectory of the movement of the selected point of the end effector. The trajectory is shown in graphical form. In Matlab, the magnitude of the position vector of the effector point is calculated as a function of time at the selected course of angular deflection in individual kinematic pairs at constant angular velocities in individual joints of the robot.

GENERIC MODEL FOR GONIOPHOTOMETER GEOMETRIES

2021 ◽  
Author(s):  
D.J. Lerch ◽  
M. Katona ◽  
K. Trampert ◽  
U. Krüger ◽  
C. Schrader ◽  
...  
Keyword(s):  
State Of The Art ◽  
Kinematic Chain ◽  
Generic Model ◽  
Chain Model ◽  
Total System ◽  
Kinematic Chains ◽  
Measurement Systems ◽  
Geometric Uncertainties ◽  
High Level

In this work, we present a method to describe the model of a goniophotometer for uncertainty analysis by state-of-the-art Universal Robotic Description Format (URDF). The parameters of the kinematic chain model are determined by measurements of the geometric properties of the goniophotometer. The uncertainties of the pose are determined using Monte Carlo (MC) simulations of the kinematic chain. The measured geometric uncertainties are input the MC simulations. The proposed framework enables high level description of kinematic chains for MC simulations of measurement systems. Furthermore, the uncertainty of the total system is demonstrated over the MC trials to prove a sufficient amount of MC trials. The results of this generic approach are evaluated against an existing model and the uncertainty determination of the same goniophotometer.

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