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Modeling and Simulation of Contact and Impact Dynamics in Multibody Systems.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Modeling and Simulation of Contact and Impact Dynamics in Multibody Systems./
Author:	Chatterjee, Abhishek.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	216 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-05, Section: B.
Contained By:	Dissertations Abstracts International81-05B.
Subject:	Mechanical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27629439
ISBN:	9781392629376

Modeling and Simulation of Contact and Impact Dynamics in Multibody Systems.
Chatterjee, Abhishek.

Modeling and Simulation of Contact and Impact Dynamics in Multibody Systems. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 216 p.

Source: Dissertations Abstracts International, Volume: 81-05, Section: B.

Thesis (Ph.D.)--The University of Texas at Arlington, 2019.

This item must not be sold to any third party vendors.

Contact and impact analyses are an essential part of multibody dynamic simulations. Modeling of contact and impact problems have applications in a wide variety of areas including robotics, earthquake engineering, computer graphics, and manufacturing. Collisions between objects typically take place over surfaces that are represented by a set of points in the operation space, thereby requiring multi-point contact and impact analysis. Analysis of multi-point contact and impact may lead to indeterminate (underdetermined) problems with more number of unknowns (contact forces) than equations.This work pertains to the problem of resolving multi-point contact and impact problems in multibody systems consisting of hard objects, that can be assumed to be rigid. In the first part of this work, a rigidity based modeling and simulation technique is developed for multi-point impacts between hard objects. In this proposed framework impacts are treated as discrete events during which the velocities of the system evolve in the impulse-domain, based on an impulse-momentum theory called Darboux-Keller shock. Constraints derived based on the rigid body assumption are used to resolve indeterminacy associated with multi-point analysis. An energetic terminal constraint is also proposed based on Stronge's Hypothesis, that guarantees the treatment of impact to be energetically consistent. This approach is used to derive both planar and three-dimensional models of multi-point indeterminate impacts.The rigid impact model based on impulse-momentum theory, developed in the first part of this work, loses some information like force and deformation histories during impacts. This lost information, however can be useful in certain types of application. Hence, to retain this information, the second part of this work proposes a method of augmenting the rigid-impact model with a contact force model from the contact mechanics literature to simultaneously determine the force and deformation histories during an impact event. The contact force model used here is a viscoelastoplastic model of contact that considers the effects of permanent (plastic) deformation in the material. A relationship is developed between the permanent deformations of the material and the energetic terminal constraint proposed in the first part of this work to characterize the force histories during collisions.The accumulation of discrete impact events during the time-domain simulation may lead to chattering or zeno phenomenon, causing the adaptive step-size integration to halt or fail. This work resolves this problem by transitioning to contact when the normal components of the post-impact velocities become very small. During contact, the forces between the participating rigid bodies satisfy the: 1) non-penetrability condition and 2) frictional force constraints based on Coulomb Friction. The non-penetrability condition enforces normal velocity and acceleration constraints on the equations of motion, whereas the Coulomb friction constrains the tangential forces at the contact points. These constraints placed on the equations of motion, lead to a reduction in the number of degrees of freedom (DOF) of the system. This work uses an online constraint embedding technique to enforce contact constraints.

ISBN: 9781392629376Subjects--Topical Terms:

557493
Mechanical engineering.
Subjects--Index Terms:

Multibody dynamics

Modeling and Simulation of Contact and Impact Dynamics in Multibody Systems.
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300 $a 216 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-05, Section: B.
500 $a Advisor: Bowling , Alan.
502 $a Thesis (Ph.D.)--The University of Texas at Arlington, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a Contact and impact analyses are an essential part of multibody dynamic simulations. Modeling of contact and impact problems have applications in a wide variety of areas including robotics, earthquake engineering, computer graphics, and manufacturing. Collisions between objects typically take place over surfaces that are represented by a set of points in the operation space, thereby requiring multi-point contact and impact analysis. Analysis of multi-point contact and impact may lead to indeterminate (underdetermined) problems with more number of unknowns (contact forces) than equations.This work pertains to the problem of resolving multi-point contact and impact problems in multibody systems consisting of hard objects, that can be assumed to be rigid. In the first part of this work, a rigidity based modeling and simulation technique is developed for multi-point impacts between hard objects. In this proposed framework impacts are treated as discrete events during which the velocities of the system evolve in the impulse-domain, based on an impulse-momentum theory called Darboux-Keller shock. Constraints derived based on the rigid body assumption are used to resolve indeterminacy associated with multi-point analysis. An energetic terminal constraint is also proposed based on Stronge's Hypothesis, that guarantees the treatment of impact to be energetically consistent. This approach is used to derive both planar and three-dimensional models of multi-point indeterminate impacts.The rigid impact model based on impulse-momentum theory, developed in the first part of this work, loses some information like force and deformation histories during impacts. This lost information, however can be useful in certain types of application. Hence, to retain this information, the second part of this work proposes a method of augmenting the rigid-impact model with a contact force model from the contact mechanics literature to simultaneously determine the force and deformation histories during an impact event. The contact force model used here is a viscoelastoplastic model of contact that considers the effects of permanent (plastic) deformation in the material. A relationship is developed between the permanent deformations of the material and the energetic terminal constraint proposed in the first part of this work to characterize the force histories during collisions.The accumulation of discrete impact events during the time-domain simulation may lead to chattering or zeno phenomenon, causing the adaptive step-size integration to halt or fail. This work resolves this problem by transitioning to contact when the normal components of the post-impact velocities become very small. During contact, the forces between the participating rigid bodies satisfy the: 1) non-penetrability condition and 2) frictional force constraints based on Coulomb Friction. The non-penetrability condition enforces normal velocity and acceleration constraints on the equations of motion, whereas the Coulomb friction constrains the tangential forces at the contact points. These constraints placed on the equations of motion, lead to a reduction in the number of degrees of freedom (DOF) of the system. This work uses an online constraint embedding technique to enforce contact constraints.
590 $a School code: 2502.
650 4 $a Mechanical engineering. $3 557493
650 4 $a Robotics. $3 561941
653 $a Multibody dynamics
653 $a Contact
653 $a Impact
653 $a Collision
653 $a Rigid
653 $a Stick-slip transition
653 $a Online constraint embedding
653 $a Coordinate partitioning
653 $a Coordinate reduction
653 $a Deformations
653 $a Impact forces
653 $a Time of impact
690 $a 0548
690 $a 0771
710 2 $a The University of Texas at Arlington. $b Mechanical and Aerospace Engineering. $3 1148619
773 0 $t Dissertations Abstracts International $g 81-05B.
790 $a 2502
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27629439