Contact Modeling in Multibody Systems with Elastic Bodies in High-Frequency Applications

PAMM ◽  
2014 ◽  
Vol 14 (1) ◽  
pp. 39-40
Author(s):  
Sebastian Schulze ◽  
Walter Sextro ◽  
Frank Grüter
Keyword(s):  
High Frequency ◽  
Multibody Systems ◽  
Contact Modeling ◽  
Elastic Bodies

scholarly journals Multibody Systems with Flexible Elements

Symmetry ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1359
Author(s):  
Marin Marin ◽  
Dumitru Băleanu ◽  
Sorin Vlase
Keyword(s):  
Multibody Systems ◽  
Computer Assisted ◽  
Elastic Bodies ◽  
Algorithmic Analysis

The formalism of multibody systems offers a means of computer-assisted algorithmic analysis and a means of simulating and optimizing an arbitrary movement of a possible high number of elastic bodies in the connection [...]

A Preprocessor for the Treatment of Elastic Bodies in Multibody Systems

1991 ◽  
Author(s):  
Kai Sorge ◽  
Friedrich Pfeiffer
Keyword(s):  
Multibody Systems ◽  
Computational Effort ◽  
Elastic Ring ◽  
Elastic Bodies ◽  
Symbolic Calculator

Abstract A preprocessor providing the inertia data of elastic bodies for multibody algorithms is considered. The desired capability of including stress stiffening terms leads to a high computational effort. The method presented allows a straight forward implementation of the basic formulas by starting with the development of a special purpose symbolic calculator. A rotating elastic ring serves as an example.

Semi-Symbolical Equations of Motion for Flexible Multibody Systems

1993 ◽  
Author(s):  
Frank Melzer
Keyword(s):  
Data Model ◽  
Multibody Systems ◽  
Equations Of Motion ◽  
General Purpose ◽  
Flexible Multibody Systems ◽  
Dynamical Analysis ◽  
Lightweight Structures ◽  
Elastic Bodies ◽  
Flexible Multibody ◽  
Increasing Demand

Abstract The need for computer aided engineering in the analysis of machines and mechanisms led to a wide variety of general purpose programs for the dynamical analysis of multibody systems. In the past few years the incorporation of flexible bodies in this methodology has evolved to one of the major research topics in the field of multibody dynamics, due to the use of more lightweight structures and an increasing demand for high-precision mechanisms such as robots. This paper presents a formalism for flexible multibody systems based on a minimum set of generalized coordinates and symbolic computation. A standardized object-oriented data model is used for the system matrices, describing the elastodynamic behaviour of the flexible body. Consequently, the equations of motion are derived in a form independent of the chosen modelling technique for the elastic bodies.

Circular Contact of Incompressible, Nonlinear-Elastic Bodies

2009 ◽  
Author(s):  
Emanuel Diaconescu ◽  
Marilena Glovnea ◽  
Filip Ciutac
Keyword(s):  
Nonlinear Elasticity ◽  
Simple Approach ◽  
Experimental Results ◽  
Contact Modeling ◽  
Elastic Bodies ◽  
Nonlinear Elastic ◽  
Theory And Experiments ◽  
Circular Contact ◽  
Good Agreement

Contact modeling of rubber bodies is based either on viscoelasticity, nonlinear elasticity or adhesion. This paper advances a simple approach to the analysis of the contacts involving incompressible, nonlinear elastic bodies and reports experimental results on rubber to justify this approach. A good agreement is found between theory and experiments.

Aspects of Symbolic Formulations in Flexible Multibody Systems

2014 ◽  
Vol 9 (4) ◽  
Author(s):  
Markus Burkhardt ◽  
Robert Seifried ◽  
Peter Eberhard
Keyword(s):  
Multibody Systems ◽  
Multibody System ◽  
Dynamic Properties ◽  
Equations Of Motion ◽  
Flexible Multibody Systems ◽  
Fem Model ◽  
Local Shape ◽  
Flexible Bodies ◽  
Elastic Bodies ◽  
Flexible Multibody

The symbolic modeling of flexible multibody systems is a challenging task. This is especially the case for complex-shaped elastic bodies, which are described by a numerical model, e.g., an FEM model. The kinematic and dynamic properties of the flexible body are in this case numerical and the elastic deformations are described with a certain number of local shape functions, which results in a large amount of data that have to be handled. Both attributes do not suggest the usage of symbolic tools to model a flexible multibody system. Nevertheless, there are several symbolic multibody codes that can treat flexible multibody systems in a very efficient way. In this paper, we present some of the modifications of the symbolic research code Neweul-M2 which are needed to support flexible bodies. On the basis of these modifications, the mentioned restrictions due to the numerical flexible bodies can be eliminated. Furthermore, it is possible to re-establish the symbolic character of the created equations of motion even in the presence of these solely numerical flexible bodies.

scholarly journals Hertz Model Based Contact Modeling for Joints with Clearance

2018 ◽  
Vol 179 ◽  
pp. 01018
Author(s):  
Jielong Wang ◽  
Bing Shi
Keyword(s):  
Multibody Systems ◽  
Flexible Multibody Systems ◽  
Contact Modeling ◽  
Normal Contact ◽  
Hertz Model ◽  
Revolute Joints ◽  
Flexible Multibody ◽  
Contact Models ◽  
Contact Impact ◽  
The Relationship

This paper presents the techniques of contact modeling for revolute joints in flexible multibody systems, in which the dry clearance revolute joints have been coupled with the flexibility of connected bodies. The contact model for revolute joints takes into account the relative planar motion caused by the clearance between the outer and inner races. This model applies a penalty method to simulate the phenomenon of inner-penetration between contact/impact bodies. The relationship between the normal contact force and the inner-penetration is described by the nonlinear Hertz model with energy dissipation. Meanwhile, the friction force can be predicted from continuous Coulomb's law. Finally, an example of flexible multibody systems has been simulated by using the developed contact models.

Acoustic Resonance Scattering by Submerged Elastic Shells

1990 ◽  
Vol 43 (8) ◽  
pp. 171-208 ◽  
Author(s):  
G. C. Gaunaurd ◽  
M. F. Werby
Keyword(s):  
High Frequency ◽  
Asymptotic Methods ◽  
Resonance Region ◽  
Acoustic Resonance ◽  
Resonance Scattering ◽  
Elastic Shells ◽  
Acoustic Wave Scattering ◽  
Elastic Bodies ◽  
Unbounded Media ◽  
Numerical Approaches

We review a number of instances in which classical acoustic wave scattering from submerged elastic shells can be analyzed in the resonance region of their spectra. We recently reviewed (Refs 42, 43, 12) the cases dealing with acoustic resonance scattering from solid elastic bodies, or with elastic resonance scattering from fluid or solid inclusions in elastic media. It only remains for us to address the works dealing with submerged shells, which we analyze here. We study scattering by bare or viscoelastically coated spherical and cylindrical shells in water, by means of (exact) normal-mode solutions, and by spheroidal shells by numerical approaches, particularly via the T-matrix method. We consider the shell responses mostly in unbounded media and when the interrogating waves are plane and c.w., although some recent findings valid for pulsed incidences and in the vicinity of environmental boundaries are also included. We use the methodology of the resonance scattering theory (RST) as much as possible, emphasizing its post-1981 results. High-frequency findings, obtained by asymptotic methods, are extrapolated to lower frequencies, to confirm RST predictions for the intermediate spectral regions in which the most important structural resonances are known to reside. A large number of bibliographical entries are collected and discussed in connection with our approach.

scholarly journals Influence of Contact Modeling on Numerical Analyses of High Frequency Wheel-rail Interactions

2020 ◽  
Vol 56 (12) ◽  
pp. 124 ◽  
Author(s):  
ZHANG Peng ◽  
ZHAO Xin ◽  
LING Liang ◽  
TAO Gongquan ◽  
WEN Zefeng
Keyword(s):  
High Frequency ◽  
Numerical Analyses ◽  
Contact Modeling
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