Multibody Contact Algorithms for Fracturing Solids

2011 ◽  
pp. 75-116
Author(s):  
Peter Wriggers ◽  
Sven Reese
Keyword(s):  
Multibody Contact

Research for a Projectile Positioning Structure for Stacked Projectile Weapons

2011 ◽  
Vol 78 (5) ◽  
Author(s):  
Qiao Luo ◽  
Xiaobing Zhang
Keyword(s):  
Friction Coefficient ◽  
Structural Parameters ◽  
Static Friction ◽  
Element Model ◽  
Ballistic Performance ◽  
Static Friction Coefficient ◽  
Key Technologies ◽  
Contact Surfaces ◽  
Proper Material ◽  
Multibody Contact

One of the key technologies of stacked projectile weapons is projectile positioning. However, the present projectile positioning structures have their respective advantages and shortcomings. A new structure based on the self-locking principle is put forward in this paper and verified as feasible by static analysis if the proper material and structural parameters are chosen. In order to check the strength and verify the feasibility of the structure under launch conditions, the multibody contact finite element model of the structure is established, coupled with dynamic load in the interior ballistic cycle. According to simulations and analysis, the projectile positioning structure is feasible and the strength of the projectile can meet the strength requirement for launch conditions. For different maximum static friction coefficients, simulations show that an increase in the maximum static friction coefficient between the contact surfaces of the positioning ring and barrel improves the positioning performance, but an increase in the maximum static friction coefficient between the contact surfaces of the positioning ring and projectile worsens. On the basis of great computation, it is found that an increase in the upper thickness and height of the positioning ring improves the positioning performance, but an increase in the lower thickness worsens the positioning performance. Further, a lower thickness affects the positioning performance more greatly. As a result, the positioning ring will be thin and light to improve the positioning performance. Compared with other positioning structures, the new structure has little influence on the ballistic performance and is a good application prospect.

Advancement of Contact Dynamics Modeling for Human Spaceflight Simulation Applications

2017 ◽  
Author(s):  
Thomas A. Brain ◽  
Erik B. Kovel ◽  
John R. MacLean ◽  
Leslie J. Quiocho
Keyword(s):  
Collision Detection ◽  
Software Tool ◽  
Contact Dynamics ◽  
Dynamics Simulation ◽  
3D Graphics ◽  
Dynamics Modeling ◽  
Geometric Data ◽  
Computational Performance ◽  
Dynamics Response ◽  
Multibody Contact

Pong is a new software tool developed at the NASA Johnson Space Center that advances interference-based geometric contact dynamics based on 3D graphics models. The Pong software consists of three parts: a set of scripts to extract geometric data from 3D graphics models, a contact dynamics engine that provides collision detection and force calculations based on the extracted geometric data, and a set of scripts for visualizing the dynamics response with the 3D graphics models. The contact dynamics engine can be linked with an external multibody dynamics engine to provide an integrated multibody contact dynamics simulation. This paper provides a detailed overview of Pong including the overall approach, modeling capabilities, which encompasses force generation to computational performance, and example applications.

Developing of a Simscape Multibody Contact Library for Gothic Arc Ball Screws: A Three-Dimensional Model for Internal Sphere/Grooves Interactions

2019 ◽  
Author(s):  
Antonio Carlo Bertolino ◽  
Giovanni Jacazio ◽  
Stefano Mauro ◽  
Massimo Sorli
Keyword(s):  
Complex Geometry ◽  
Three Dimensional ◽  
Ball Screw ◽  
Mechanical Modeling ◽  
Three Dimensional Model ◽  
Simulation Tools ◽  
First Case ◽  
Multibody Contact ◽  
Helical Grooves

Abstract The Simscape Multibody software is a set of libraries and mechanical modeling and simulation tools for use with Simulink®. For what concerns the contact library, currently it contains only the models to describe impacts between simple geometries, such as spheres, cylinders and planes. When this environment is intended to be used to simulate the 3D dynamics of a system with a complex geometry, such as a ball screw, the built-in blocks are not sufficient. This paper presents a new contact library, containing blocks specifically designed to handle the contacts between a sphere and the two gothic arc helical grooves of a ball screw, as well as the interaction between adjacent spheres. The developed blocks are exploited to create a first case study dynamic model of a single nut not preloaded ball screw in presence of internal backlash. The results highlight the superiority of this multibody approach with respect to the quasi-static or lumped parameters models in terms of extracted information and understanding of the internal mechanics.

Multibody contact dynamics on mechanisms with deep groove ball bearing joints

2017 ◽  
Vol 31 (9) ◽  
pp. 4119-4135 ◽  
Author(s):  
Tingqiang Yao ◽  
Liguo Xian ◽  
Lihua Wang ◽  
Xiaobao Liu
Keyword(s):  
Ball Bearing ◽  
Contact Dynamics ◽  
Deep Groove ◽  
Deep Groove Ball Bearing ◽  
Multibody Contact
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