Multi-Body Contact Finite Element Analysis of Teeth and Orthodontic Devices

2009 ◽  
Author(s):  
Chunyan Wang ◽  
Jun Zhang ◽  
Xiaofei Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Body Contact ◽  
Orthodontic Devices ◽  
Multi Body

Estimation of Dynamic Mechanical Error for Evaluation of Machine Tool Structures

2012 ◽  
Vol 6 (2) ◽  
pp. 147-153 ◽  
Author(s):  
Daisuke Kono ◽  
◽  
Sascha Weikert ◽  
Atsushi Matsubara ◽  
Kazuo Yamazaki ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Machine Tool ◽  
Driving Force ◽  
Inertial Force ◽  
Element Analysis ◽  
Simple Method ◽  
Dynamic Mechanical ◽  
Machine Tool Structures ◽  
Multi Body

Dynamic motion errors of machine tools consist of errors in the mechanical system and the servo system. In this study, a simple method to estimate the dynamic mechanical error is proposed to evaluate machine tool structures. The dynamic mechanical error in the low frequency range is estimated from the static deformation due to the driving force, the counter force, and the inertial force. The error in a high-precision machine tool is estimated for comparison with measurements. Two calculation tools, finite element analysis and rigid multi-body simulation, are used for the estimation. Measured dynamic mechanical errors can be correctly estimated by the proposed method using finite element analysis. The tilt of driven bodies is the major reason for dynamic mechanical errors. When the reduction factor representing the structural deformation is properly determined, the rigid multi-body simulation is also an effective tool. Use of the proposed method for modification planning is demonstrated. Stiffness enhancement of the saddle was an effective modification candidate to reduce the dynamic mechanical error. If the error should be reduced to sub-micrometer level, the location of components should be modified because the Abbe offset and the offset of the driving force from the inertial force must be shortened.

Joint Modeling and Simulation of the Spindle System of Hammer Crusher Based on Finite Element Analysis and Flexible Multi-Body Dynamics. Part1: Modeling

2012 ◽  
Vol 630 ◽  
pp. 291-296
Author(s):  
Yu Wang ◽  
En Chen ◽  
Jun Qing Gao ◽  
Yun Feng Gong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
System Simulation ◽  
Geometric Model ◽  
Body System ◽  
Element Analysis ◽  
Spindle System ◽  
Body Dynamics ◽  
Multi Body ◽  
The Impact

In the past finite element analysis (FEA) and multi-body system simulation (MBS) were two isolated methods in the field of mechanical system simulation. Both of them had their specific fields of application. In recent years, it is urgent to combine these two methods as the flexible multi-body system grows up. This paper mainly focuses on modeling of the spindle system of hammer crusher, including geometric model, finite element model and multi-body dynamics (MBD) model. For multi-body dynamics modeling, the contact force between hammer and scrap steel was discussed, which is important to obtain the impact force. This paper also proposed how to combine FEA and MBS to analyze the dynamic performance of the spindle system by using different software products of MSC.Software.

Finite Element Modeling and Analysis of Rolling Bearing Based on Explicit Dynamics

2013 ◽  
Vol 397-400 ◽  
pp. 589-592 ◽  
Author(s):  
Jing Cui ◽  
Hua Qing Wang ◽  
Fei Xiao ◽  
Zuo Yi Dong
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Rolling Bearing ◽  
Element Analysis ◽  
Modeling And Analysis ◽  
Body Contact ◽  
Explicit Dynamics ◽  
Deep Groove ◽  
Rolling Elements ◽  
Multi Body

A finite element model of a rolling bearing with ANSYS/LS-DYNA is bulit , considering pressure, speed, multi-body contact effects and constraints under friction. The movement process of the rolling bearing based on explicit dynamics is simulated successfully. Several relevant parameters of 6205 deep groove ball bearing are calculated and determined. The results show that rotational speeds of cage and rolling elements which get from finite element analysis are consistent with the theoretical calculated values and stress situations are the same as Hertz analysis solutions. It proves that the proposed model is effective, which lays a foundation for subsequent analysis and diagnosis for defected bearings.

scholarly journals Study on the lateral and torsional vibration of single rotor-system using an integrated multi-body dynamics and finite element analysis

2020 ◽  
Vol 12 (10) ◽  
pp. 168781402096833
Author(s):  
Abdelrahman I A Eisa ◽  
Li Shusen ◽  
Wasim M K Helal
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Torsional Vibration ◽  
Rapid Development ◽  
Rotor System ◽  
Motor Speed ◽  
Element Analysis ◽  
Body Dynamics ◽  
Bearing Force ◽  
Multi Body

Due to rapid development in the industry, operating speeds and eccentricity produced undesirable vibrations which may lead to damage in bearings, seals, and lubrication systems. In the proposed paper, a novel analytical method was presented using an integrated multi-body dynamics and finite element analysis to simulate the lateral and torsional vibration. This method was applied to a proposed model of single rotor-system. In order to study the lateral and torsional vibration of the system profoundly, three markers were placed on the locations of the left and right bearings and the mass center of the shaft. The effects of bearing force caused by lateral and torsional vibrations were also analyzed. The results showed that the lateral vibration has a great effect on the dynamic of single rotor-system when lowering motor speed. It was found that, as motor speed increased, the motion of the system becomes more stable with steady fluctuates of the displacement response. The calculated natural frequency of SRS is compared with theoretical results to verify the transient solver. This novel method is practical in analyzing the lateral and torsional vibration of the SRS under various speeds and eccentricities.

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