Three-Dimensional Modeling of Debris Mixing and Sedimentation in Severe Accidents Using the Moving Particle Semi-Implicit Method Coupled with Rigid Body Dynamics

2013 ◽  
Vol 181 (1) ◽  
pp. 227-239 ◽  
Author(s):  
Shane Park ◽  
Hyun Sun Park ◽  
Gyoodong Jeun ◽  
Bum Jin Cho
Keyword(s):  
Rigid Body ◽  
Three Dimensional ◽  
Rigid Body Dynamics ◽  
Implicit Method ◽  
Three Dimensional Modeling ◽  
Severe Accidents ◽  
Dimensional Modeling ◽  
Body Dynamics ◽  
Moving Particle

scholarly journals Hamilton’s Equations With Euler Parameters for Rigid Body Dynamics Modeling

2004 ◽  
Vol 126 (1) ◽  
pp. 124-130 ◽  
Author(s):  
Ravishankar Shivarama ◽  
Eric P. Fahrenthold
Keyword(s):  
Rigid Body ◽  
Three Dimensional ◽  
Nonlinear Problems ◽  
Potential Energy Function ◽  
Rigid Body Dynamics ◽  
Dynamics Modeling ◽  
Euler Parameters ◽  
Strongly Nonlinear ◽  
Body Dynamics ◽  
General Potential

A combination of Euler parameter kinematics and Hamiltonian mechanics provides a rigid body dynamics model well suited for use in strongly nonlinear problems involving arbitrarily large rotations. The model is unconstrained, free of singularities, includes a general potential energy function and a minimum set of momentum variables, and takes an explicit state space form convenient for numerical implementation. The general formulation may be specialized to address particular applications, as illustrated in several three dimensional example problems.

Research on Dynamic Balance of Linkage Considering the Influence of Elastic Deformation Based on Simulation

2012 ◽  
Vol 217-219 ◽  
pp. 1465-1470
Author(s):  
Qi Bing Li ◽  
Yu Huang
Keyword(s):  
Objective Function ◽  
Elastic Deformation ◽  
Dynamic Balance ◽  
Three Dimensional ◽  
Geometrical Shape ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Body Dynamics ◽  
Modeling Software ◽  
Multi Body

A method based on mechanical kinetics, Virtual Prototype technology and Finite Element Method (FEM) is proposed, aiming at the dynamic balance of planar linkage with elastic deformation. The method applies to the situation that the elastic deformation of the components can’t be neglected. Translate the key components to flexible bodies by FEM; Build the rigid-flexible multi-body dynamics model by dynamic analysis software, and synthetically optimize the dynamic balance of the model by using the comprehensive indicator which includes input torque, shaking force and moment as the objective function; Finally, according to the parameter result of the previous optimization, the component’s geometrical shape was designed in three-dimensional modeling software. Taking a kind of crank-slide mechanism as an example, it uses this method to optimize a crank-slide mechanism’s dynamic balance and to make the objective function value declined by about 9.2%. The mechanism’s vibration characteristic is improved, so the method is proved to be practical and effective.

Validation of a Computational Musculoskeletal Model of the Elbow

2007 ◽  
Author(s):  
Justin P. Fisk ◽  
Jennifer S. Wayne
Keyword(s):  
Rigid Body ◽  
Degrees Of Freedom ◽  
Three Dimensional ◽  
Rigid Body Dynamics ◽  
Clinical Tool ◽  
Element Analysis ◽  
Reconstructive Procedures ◽  
Biomechanical Models ◽  
Musculoskeletal Models ◽  
Body Dynamics

Musculoskeletal computational modeling can be a powerful and useful tool to study joint behavior, examine muscle and ligament function, measure joint contact pressures, simulate injury, and analyze the biomechanical results of reconstructive procedures. Commonly, biomechanical models are based on either finite element analysis (FEA) or three-dimensional rigid body dynamics. While each approach has advantages for specific applications, rigid body dynamics algorithms are highly efficient [1], thus significantly reducing solution time. Many musculoskeletal models of the elbow have been developed [2, 3], but all have constrained the articulations to have particular degrees of freedom and ignored the effects of ligaments. An accurate and robust model without these limitations has potential as a clinical tool to predict the outcome of injuries and/or surgical procedures. This work develops and validates an accurate computational model of the elbow joint whereby joint kinematics are dictated by three-dimensional bony geometry contact, ligamentous constraints, and muscle loading.

An Investigation on the Issues in Modelling of Free Flight in Animal Locomotion

2011 ◽  
Author(s):  
Masateru Maeda ◽  
Toshiyuki Nakata ◽  
Hao Liu
Keyword(s):  
Rigid Body ◽  
Degrees Of Freedom ◽  
Aerodynamic Force ◽  
Three Dimensional ◽  
Micro Air Vehicles ◽  
Rigid Body Dynamics ◽  
Free Flight ◽  
Comprehensive Investigation ◽  
Body Dynamics ◽  
Generation Mechanisms

Aiming at establishing an effective computational framework to accurately predict free-flying dynamics and aerodynamics we here present a comprehensive investigation on some issues associated with the modelling of free flight. Free flight modelling/simulation is essential for some types of flights e.g. falling leaves or auto-rotating seeds for plants; unsteady manoeuvres such as take-off, turning, or landing for animals. In addition to acquiring the deeper understanding of the flight biomechanics of those natural organisms, revealing the sophisticated aerodynamic force generation mechanisms employed by them may be useful in designing man-made flying-machines such as rotary or flapping micro air vehicles (MAVs). The simulations have been conducted using the coupling of computational fluid dynamics (CFD) and rigid body dynamics, thus achieving the free flight. The flow field is computed with a three-dimensional unsteady incompressible Navier-Stokes solver using pseudo-compressibility and overset gird technique. The aerodynamic forces acting on the flyer are calculated by integrating the forces on the surfaces. Similarly, the aerodynamic torque around the flyer’s centre of mass is obtained. The forces and moments are then introduced into a six degrees-of-freedom rigid body dynamics solver which utilises unit quaternions for attitude description in order to avoid singular attitude. Results are presented of a single body model and some insect-like multi-body models with flapping wings, which point to the importance of free-flight modelling in systematic analyses of flying aerodynamics and manoeuvrability. Furthermore, a comprehensive investigation indicates that the framework is capable to predict the aerodynamic performance of free-flying or even free-swimming animals in an intermediate range of Reynolds numbers (< 105).

Addenda to “On Singularity of Rigid-Body Dynamics Using Quaternion-Based Models”

2013 ◽  
Vol 80 (4) ◽  
Author(s):  
Homin Choi ◽  
Bingen Yang
Keyword(s):  
Rigid Body ◽  
Inertial Frame ◽  
Three Dimensional ◽  
Rigid Bodies ◽  
Rigid Body Dynamics ◽  
Coordinate Systems ◽  
Body Frame ◽  
Modeling And Analysis ◽  
Body Dynamics

Although quaternions are singularity-free in modeling and analysis of rigid bodies in three-dimensional motion, description of torques may lead to unbounded response of a quaternion-based model. This paper gives theorems on the conditions of torque-induced singularity in four coordinate systems: inertial frame, body frame, Euler basis, and dual Euler basis. According to the theorems, torques applied in an inertial frame or a body frame or a Euler basis will never cause unbounded motion; torques applied in a dual Euler basis, however, may lead to unbounded motion.

Time-stepping for three-dimensional rigid body dynamics

1999 ◽  
Vol 177 (3-4) ◽  
pp. 183-197 ◽  
Author(s):  
Mihai Anitescu ◽  
Florian A. Potra ◽  
David E. Stewart
Keyword(s):  
Rigid Body ◽  
Three Dimensional ◽  
Rigid Body Dynamics ◽  
Time Stepping ◽  
Body Dynamics
Sign in / Sign up

Export Citation Format

Share Document