Simulation of Motor-Scooter Drop Testing by a Multi-Body Finite Element Integrated Approach

2005 ◽  
Vol 219 (4) ◽  
pp. 383-391 ◽  
Author(s):  
F Frendo
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Procedure ◽  
Integrated Approach ◽  
Element Analysis ◽  
Experimental Activity ◽  
Body Model ◽  
Experimental Apparatus ◽  
Set Up ◽  
Multi Body

The drop test is employed in the motor-scooter industry for evaluating the frame performance under particularly severe conditions. In this work, a numerical procedure developed for simulating the test is presented. The procedure includes a multi-body model for the evaluation of the maximum loads acting on the scooter frame during impact at ground. Such loads were then employed in a non-linear static finite element analysis in order to obtain the permanent frame deformation. The experimental activity carried out for vehicle characterization and the experimental apparatus set up for tests are also presented in detail. The multi-code approach appeared versatile and straightforward, and furnished results in satisfactory agreement with experiments.

Optimization Study of Pipeline Rock Armour Protection Design Based on Finite Element Analysis

2010 ◽  
Author(s):  
LeQin Wang ◽  
HongKiat Chia
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Physical Model ◽  
Numerical Procedure ◽  
Extensive Study ◽  
Design Guidelines ◽  
Physical Model Test ◽  
Element Analysis ◽  
Protection Mechanism ◽  
Set Up

The design of pipeline protection with rock armour berms has been traditionally based on model testing because there has been no closed-form analytical solution available to resolve the complex interaction between the anchor, anchor chain, seabed soil and rock armour. Compared to the costly physical model test, a numerical procedure properly set up allows effective and extensive study on various rock berm configurations. It is expected that better optimized pipeline rock armour protection berm can be designed to offer appreciable savings on project cost. The authors have developed a Finite Element Analysis (FEA) based procedure which can predict the clearance between the anchor fluke tip and pipeline as well as the pushing force on the pipeline during anchor dragging. Both the clearance and pushing force can be used to assess the potential anchor damage to a pipeline with rock backfill protection. The FEA results have been successfully validated against results obtained from physical model tests. A series of numerical tests are performed considering the variations in the trench profile, the armour rock shape, rock particle size and grading properties etc. The protection mechanism of the rock armour berm, with regard to the above factors, is discussed to provide a better understanding for the significance of each parameter in the protection design. Guidelines in achieving an optimized rock berm protection design are also given.

Design of a Single-Acting Constant-Force Actuator Based on Dielectric Elastomers

2008 ◽  
Author(s):  
Giovanni Berselli ◽  
Rocco Vertechy ◽  
Gabriele Vassura ◽  
Vincenzo Parenti Castelli
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Compliant Mechanism ◽  
Structural Parameters ◽  
Dielectric Elastomer ◽  
Constant Force ◽  
Element Analysis ◽  
Body Model ◽  
Rigid Body Model ◽  
Supporting Frame

The interest in actuators based on dielectric elastomer films as a promising technology in robotic and mechatronic applications is increasing. The overall actuator performances are influenced by the design of both the active film and the film supporting frame. This paper presents a single-acting actuator which is capable of supplying a constant force over a given range of motion. The actuator is obtained by coupling a rectangular film of silicone dielectric elastomer with a monolithic frame designed to suitably modify the force generated by the dielectric elastomer film. The frame is a fully compliant mechanism whose main structural parameters are calculated using a pseudo-rigid-body model and then verified by finite element analysis. Simulations show promising performance of the proposed actuator.

Finite Element Analysis and Topology Optimization of the Clamping Unit in a Two-Platen Injection Machine

2011 ◽  
Vol 117-119 ◽  
pp. 1535-1542 ◽  
Author(s):  
Hua Wei Zhang ◽  
Wei Xia ◽  
Zhi Heng Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Topology Optimization ◽  
Element Model ◽  
Molding Machine ◽  
Element Analysis ◽  
And Topology ◽  
The Finite Element Analysis ◽  
Set Up ◽  
The Finite Element Model

In this paper, the clamping unit of a two-platen injection molding machine was modeled by Pro/ENGINEER, and was imported to Altair HyperWorks. In HyperMesh module, the finite element model was set up, ANSYS has been used in the finite element analysis of the clamping unit and the deformation and stress results were obtained. Based on the topology optimization of HyperWorks/OptiStruct, recommendations to improve the structure of the clamping mechanism are presented; the results showed that less material was used while its performance was maintained.

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.

Finite Element Analysis on Integral Structure of Light Steel Temporary Buildings

2013 ◽  
Vol 405-408 ◽  
pp. 921-924
Author(s):  
Xue Feng Cai ◽  
Zheng Zhang ◽  
Yong Chao Ma ◽  
Ji Zhong Zhou
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Simple Structure ◽  
Lateral Displacement ◽  
Structure Model ◽  
Analysis Model ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
Integral Structure ◽  
Set Up

Light steel temporary building is commonly used in the construction site, with advantages on simple structure, repeat used and small deadweight. There are still not enough researches and relevant standards to conduct the design and construction of the buildings. In order to precede to theoretical study on integral structure of light steel temporary buildings a method which used to set up finite element analysis model about integral structure of light steel temporary buildings was proposed in this paper. The method is based on finite element analysis software, Ansys. Using this method a monolayer integral structure, a two-story integral structure and a trilaminar integral structure model were set up. Lateral displacement under design load of the integral structure was solved out by these finite element models.

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