A New Kind of Road Structure-Borne N & amp;V Prediction Method Based on Combination of High-Frequency Parameterized Model of Bushes, Multi-Body Calculation on Adams and Finite Element Model

2018 ◽  
Author(s):  
Rong He
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
High Frequency ◽  
Prediction Method ◽  
Element Model ◽  
Parameterized Model ◽  
Multi Body

Modal Based Geometric Stiffening Formulation for Dynamics Simulation of Multibody Systems

2011 ◽  
Author(s):  
Fengxia Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Dynamics Simulation ◽  
Reduced Model ◽  
Reduced Models ◽  
Modal Reduction ◽  
Body Dynamics ◽  
Geometric Stiffening ◽  
Multi Body

This work concerns the implementation of nonlinear modal reduction to flexible multi-body dynamics. Linear elastic theory will lead to instability issues with rotating beamlike structures, due to the neglecting of the membrane-bending coupling on the beam cross-section. During the past decade, considerable efforts have been focused on the derivation of geometric nonlinear formulation based on nodal coordinates. In this work, in order to improve the convergence characteristic and also to reduce the computation time in flexible multi-body dynamics, which is extremely important for complicated large systems, a standard modal reduction procedure based on matrix operation is developed with essential geometric stiffening nonlinearities retained in the equation of motion. The example used in this work is a rotating Euler-Bernoulli beam, two nonlinear reduced models were established based on modal coordinates, the first reduced model created from theoretical bending and axial mode shapes by Galerkin method; the second reduced model is derived by the standard matrix operator from a full finite element model. Transient simulation results of lower degrees of freedom from above two reduced models are compared with those obtained from full nonlinear finite element model.

Analysis of Crankshaft Fatigue Strength Based on Integrated Finite Element Model

2010 ◽  
Vol 44-47 ◽  
pp. 1558-1562 ◽  
Author(s):  
Xiao Ping Chen ◽  
Ru Fu Hu ◽  
Shu Hua Zheng
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Fatigue Limit ◽  
Limit Load ◽  
Element Model ◽  
Response Analysis ◽  
Analysis Model ◽  
Element Analysis ◽  
Complex Mechanical Systems ◽  
Multi Body

Aiming at the complex mechanical systems for the prediction of the fatigue limit load requirements, this paper examines the relationship among finite element analysis model and the performance models. And a finite element modeling method for fatigue analysis is proposed. The finite element model can support static, modal, fatigue, and multi-body dynamic response analysis in parallel and collaboration. This method helps improve the fatigue limit load analysis.

Lifetime Computational Models of Rolling Bearings in a 1.5MW Wind Turbine’s Epicyclic Gearbox

2012 ◽  
Vol 490-495 ◽  
pp. 1076-1080
Author(s):  
Xin Tan ◽  
Yao Li ◽  
Jun Jie Yang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Computational Model ◽  
Dynamic Model ◽  
Computational Models ◽  
Element Model ◽  
Rolling Bearings ◽  
Load Distributions ◽  
Multi Body

This paper introduces a computational model for calculating the lifetime of rolling bearings in a 1.5MW wind turbine’s epicyclic gearbox. At first, a quasi-dynamic model is established to analyze the skidding of bearings and the skew of rollers. Then, the load distributions on raceways and inner rings of bearings are calculated using the quasi-dynamic model. Meanwhile, a multi-body finite element model established in RomaxWind software is utilized to simulate and analyze dynamics behaviors of the epicyclic gearbox including all bearings. The comparison of bearings’ lifetimes calculated with different methods shows that the quasi-dynamic model can obtain very close results as the multi-body finite element model obtains, but costs less time. Failures occurring on inner and outer rings, such as pitting, adhesion, are mainly resulted from the misalignment of inner rings and roller number on the skidding of bearings

Numerical Analysis of Vehicle Occupant Responses during Rear Impact Using a Human Body Model

2014 ◽  
Vol 566 ◽  
pp. 480-485 ◽  
Author(s):  
Jonas A. Pramudita ◽  
Shunsuke Kikuchi ◽  
Yuji Tanabe
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Finite Element Model ◽  
Real World ◽  
Element Model ◽  
Vehicle Occupant ◽  
Body Model ◽  
Rear Impact ◽  
Multi Body ◽  
Impact Simulations

Understanding vehicle occupant responses during real-world rear collision accidents is very important in the development of appropriate safety technologies for neck injury lessening. In this study, numerical analysis of vehicle occupant responses during rear impact were conducted by using a human multi-body model, a seat finite element model and crash accelerations obtained from real-world accidents. The human multi-body model was developed based on the body characteristics of a typical Japanese male, including the outer body geometry, inertial properties of body segments and passive joint characteristics. The seat finite element model was extracted from a detailed car finite element model. A small modification was done to the seat model to deal with the rear impact simulations. The crash accelerations were obtained from the drive recorder database of rear collision accidents occurred in Japan. Several crash accelerations were selected and used as input conditions during the rear impact simulations. Kinematic responses of the occupants during the accidents can be reasonably predicted by the simulations. Furthermore, different level of accelerations leads to different kinematics responses that may cause variation in injury occurrence and injury severity.

Multi-body dynamics co-simulation of hoisting wire rope

2017 ◽  
Vol 53 (1) ◽  
pp. 36-45 ◽  
Author(s):  
Qing Huang ◽  
Zhi Li ◽  
Hong-qian Xue
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Analysis ◽  
Dynamic Model ◽  
Loading Condition ◽  
Element Model ◽  
Wire Rope ◽  
Body Dynamics ◽  
Hoisting System ◽  
Multi Body

As more wire ropes with complex construction are used in the hoisting system of a crane, it becomes more necessary to predict the risks of the hoisting operation. Especially the wire rope, dynamic analysis is required to manage the potential risk in advance. Thus, in this article, a co-simulation method based on multi-body dynamics and finite element method is proposed to determine the dynamic responses of a hoisting system and wire rope. We developed a dynamic model of hoisting system based on ADAMS/Cable to formulate the time history response of dynamic force on wire rope, which could be used as the loading condition in the posterior finite element model. A three-dimensional geometric model for the multi-layered strands wire rope with a construction of 1+7+7 / 7+14 wires is implemented in the finite element analysis software ABAQUS, and both static and dynamic analyses are presented. The static analysis result of force–strain relation is compared with several experiment data, and the finite element model is proved accurate and reliable. In the latter case, the force–time curves obtained by dynamic model are imported to finite element model as loading condition to accomplish dynamic analysis. The co-simulation results of hoisting wire rope’s behavior subjected to dynamic loading during the hoisting process are carried out and discussed. The stress distribution and stress spectrum of wire rope are obtained, and the results show that the most dangerous regions are the lateral side of wire rope, especially the contact area of two wires in strands.

Subject-specific knee joint model: Design of an experiment to validate a multi-body finite element model

2010 ◽  
Vol 27 (2) ◽  
pp. 153-159 ◽  
Author(s):  
C. Öhman ◽  
D. M. Espino ◽  
T. Heinmann ◽  
M. Baleani ◽  
H. Delingette ◽  
...  
Keyword(s):  
Finite Element ◽  
Knee Joint ◽  
Finite Element Model ◽  
Element Model ◽  
Joint Model ◽  
Model Design ◽  
Subject Specific ◽  
Multi Body

The Prediction Method on Warpage of Injection Molded Parts

2011 ◽  
Vol 317-319 ◽  
pp. 211-214
Author(s):  
Tong Chen Chang ◽  
Hong Yu Zhu ◽  
Hai Hong Wu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Degrees Of Freedom ◽  
Prediction Method ◽  
Element Model ◽  
Thermal Shrinkage ◽  
Injection Molding Process ◽  
Molding Process ◽  
Molded Parts ◽  
Rotational Degrees Of Freedom

Warpage is a common defect resulted from uneven thermal shrinkage during injection molding process. In this paper, the authors investigated finite element method to predict the warpage of injection moldings with thin shell theory. In order to improve calculating accuracy, discrete Kirchhoff element combined membrane element with rotational degrees of freedom was used to build finite element model. The results predicted with this model were compared with experimental data. The results showed that this finite element model was effective to increase the prediction accuracy of the warpage because of bring transfer matrices to improve the element accuracy.

Sign in / Sign up

Export Citation Format

Share Document