A New Algorithm of the Boundary Restraining Force for One-Step Inverse Analysis

2016 ◽  
Vol 725 ◽  
pp. 511-516
Author(s):  
Yi Dong Bao ◽  
Xue Jiao Qin ◽  
Jing Cui ◽  
Hui Ting Wang
Keyword(s):  
Adaptive Algorithm ◽  
Distributed Algorithm ◽  
Inverse Analysis ◽  
The Self ◽  
Experimental Results ◽  
Blank Holder ◽  
One Step ◽  
Blank Shape ◽  
Restraining Force ◽  
Self Adaptive

In one-step inverse analysis, the restraining force produced by blank holder and draw bead need to be replaced equivalently by the nodal force to obtain a rational blank shape. But the distribution of the equivalent restraining force should not be uniform. A self-adaptive algorithm of the equivalent restraining force is presented in this paper. By comparing the initial configration contour line of the part obtained from three different methods (self-adaptive algorithm, uniformly distributed algorithm and a commercial software Fastform) with experimental results, the self-adaptive algorithm is proved to be accurate and convenient.

The Refinement Algorithm of Blank Outline Based on One-Step Inverse Analysis

2016 ◽  
Vol 725 ◽  
pp. 517-522
Author(s):  
Jia Kai Zhou ◽  
Yi Dong Bao ◽  
Wan Lin Zhou ◽  
Jing Cui ◽  
Hui Ting Wang
Keyword(s):  
Inverse Analysis ◽  
Computation Time ◽  
Initial Configuration ◽  
Final Configuration ◽  
Characteristic Lines ◽  
Rounded Corner ◽  
Part Surface ◽  
One Step ◽  
Blank Shape ◽  
Refinement Algorithm

Blank dimensions and outlines can be obtained in one-step inverse analysis. Applying more accurate mesh will achieve more precise outlines while usually lead to the increase of computation time. To ensure operation efficiency, this paper proposes a new blank outline refinement algorithm based on one-step inverse analysis. Firstly, the initial configuration is obtained from the final configuration by one-step inverse analysis. Secondly, all outline nodes is projected to the nearest element in the final configuration. Thirdly, according to the position of projected nodes in the element, the coordinate of outline nodes in the initial configuration is achieved through mapping. Finally the number of outline nodes is increased in rounded corners, the coordinate of added nodes are calculated through interpolation. At last all outlines corresponding to characteristic lines of part surface are acquired. Using A-pillar as an example, outlines are calculated by the refinement algorithm and commercial software. It proves that under the same mesh quality, outlines obtained by refinement algorithm become more accurate and smooth, especially in rounded corner. The results can contribute to judge the rationality of blank shape and improve the final part forming property. This algorithm refines the accuracy of outlines and ensures the efficiency of one-step inverse analysis.

scholarly journals A self-stabilizing algorithm for a hierarchical middleware self-adaptive deployment : specification, proof, simulations

2016 ◽  
Vol Volume 25 - 2016 - Special... ◽  
Author(s):  
Maurice-Djibril Faye ◽  
Eddy Caron ◽  
Ousmane Thiare
Keyword(s):  
Distributed Systems ◽  
Nous Avons ◽  
Adaptive Algorithm ◽  
Adaptive Systems ◽  
The Self ◽  
Adaptive Mechanism ◽  
Effective Solution ◽  
Dynamic Nature ◽  
International Audience ◽  
Self Adaptive

International audience ABSTRACT. An effective solution to deal with this dynamic nature of distributed systems is to implement a self-adaptive mechanism to sustain the distributed architecture. Self-adaptive systems can autonomously modify their behavior at run-timein response to changes in their environment. Our paper describes the self-adaptive algorithm that we developed for an existing middleware. Once the middleware is deployed, it can detects a set of events which indicate an unstable deployment state. When an event is detected, some instructions are executed to handle the event. We have proposed a sketch proof of the self-stabilizing property of the algorithm. We have designed a simulator to have a deeper insights of our proposed self-adaptive algorithm. Results of our simulated experiments validate the safe convergence of the algorithm. RÉSUMÉ.Dans cet article, nous nous intéressons aux moyens de rendre le déploiement d’un intergiciel auto-adaptatif. Le type d’intergiciel que nous avons considéré ici est hiérarchique (structure de graphe) et distribué. Les infrastructures de grilles/cloud étant dynamiques (perte et ajout de nœuds),un déploiement statique n’est pas la solution idéale car en cas de panne, il est souvent nécessaire de reprendre tout le processus de déploiement; or cette opération est très coûteuse. Nous avons donc proposé un algorithme auto-stabilisant pour que l’intergiciel puisse retrouver un état stable sans intervention extérieure, au bout d’un temps fini, lorsqu’il est confronté à des pannes transitoires. Pouravoir une idée plus précise des caractéristiques de l’algorithme, nous avons conçu un simulateur. Lesrésultats des simulations montrent qu’un déploiement, sujet à des pannes transitoires, s’auto-adapte.

A New Approach for Scaling Aspirating Face Seal Aerodynamics

2018 ◽  
Vol 141 (3) ◽  
Author(s):  
Julius Wilhelm ◽  
Corina Schwitzke ◽  
Hans-Jörg Bauer ◽  
Tue Nguyen
Keyword(s):  
Mechanical Behavior ◽  
Numerical Simulations ◽  
The Self ◽  
Experimental Results ◽  
Face Seal ◽  
Test Rig ◽  
Labyrinth Seals ◽  
New Approach ◽  
Face Seals ◽  
Self Adaptive

In the present paper, an approach for scaling the aerodynamics of advanced seals is presented. Modern advanced seals, such as a self-adaptive gas lubricated face seal, comprise elements that are commonly used in turbomachinery sealing. These are labyrinth seals and mechanical face seals. Parameters influencing the aerodynamical and mechanical behavior of each seals type are known. However, a combined methodology to scale the aerodynamics of the self-adaptive seal which consists of more than one element has not yet been published. The proposed methodology is applied to a model self-adaptive seal, and numerical simulations are performed to prove the validity of the approach. The new methodology ensures the transferability of experimental results at lab scale to engine conditions. Since the new approach allows scaling of self-adaptive seal tests, a new unique test rig will be designed accordingly.

A New Approach for Scaling Aspirating Face Seal Aerodynamics

2018 ◽  
Author(s):  
Julius Wilhelm ◽  
Corina Schwitzke ◽  
Hans-Jörg Bauer ◽  
Tue Nguyen
Keyword(s):  
Mechanical Behavior ◽  
Numerical Simulations ◽  
The Self ◽  
Experimental Results ◽  
Face Seal ◽  
Test Rig ◽  
Labyrinth Seals ◽  
New Approach ◽  
Face Seals ◽  
Self Adaptive

In the present paper an approach for scaling the aerodynamics of advanced seals is presented. Modern advanced seals, such as a self-adaptive gas lubricated face seal comprise elements that are commonly used in turbomachinery sealing. These are labyrinth seals and mechanical face seals. Parameters influencing the aerodynamical and mechanical behavior of each seals type are known. However, a combined methodology to scale the aerodynamics of the self-adaptive seal which consists of more than one element has not yet been published. The proposed methodology is applied to a model self-adaptive seal and numerical simulations are performed to prove the validity of the approach. The new methodology ensures the transferability of experimental results at lab scale to engine conditions. Since the new approach allows scaling of self-adaptive seal tests, a new unique test rig will be designed accordingly.

Lateral Tire Forces on Wet Roads

1977 ◽  
Vol 5 (2) ◽  
pp. 75-82 ◽  
Author(s):  
A. Schallamach
Keyword(s):  
Normal Load ◽  
The Self ◽  
Experimental Results ◽  
Slip Angle ◽  
Tire Model ◽  
Side Force ◽  
Tire Forces

Abstract Expressions are derived for side force and self-aligning torque of a simple tire model on wet roads with velocity-dependent friction. The results agree qualitatively with experimental results at moderate speeds. In particular, the theory correctly predicts that the self-aligning torque can become negative under easily realizable circumstances. The slip angle at which the torque reverses sign should increase with the normal load.

A Self-adaptive Algorithm with Newton Raphson Method for Parameters Identification of Photovoltaic Modules and Array

2021 ◽  
Author(s):  
Patrick Juvet Gnetchejo ◽  
Salomé Ndjakomo Essiane ◽  
Abdouramani Dadjé ◽  
Pierre Ele ◽  
Daniel Eutyche Mbadjoun Wapet ◽  
...  
Keyword(s):  
Adaptive Algorithm ◽  
Parameters Identification ◽  
Photovoltaic Modules ◽  
Newton Raphson ◽  
Raphson Method ◽  
Self Adaptive

FAST SPRINGBACK SIMULATION OF BENDING FORMING BASED ON ONE-STEP INVERSE ANALYSIS

2008 ◽  
Vol 22 (31n32) ◽  
pp. 6057-6063
Author(s):  
YI-DONG BAO ◽  
WEN-LIANG CHEN ◽  
HONG WU
Keyword(s):  
Sheet Metal Forming ◽  
Metal Forming ◽  
Inverse Analysis ◽  
Simulation Method ◽  
Spring Back ◽  
Deformation Path ◽  
Bending Process ◽  
One Step ◽  
Implicit Solver ◽  
The One

A simplified one-step inverse analysis of sheet metal forming is a suitable tool to simulate the bending forming since the deformation path of bending forming is an approximately proportion one. A fast spring-back simulation method based on one-step analysis is proposed. First, the one-step inverse analysis is applied to obtain the stress distribution at the final stage of bending. Then, the unloading to get a spring back is simulated by LS-DYNA implicit solver. These processes are applied to the unconstrained cylindrical bending and the truck member rail. The spring-back and member rail widths at the several key sections are compared with experimental ones. It is well demonstrated that the proposed method is an effective way to predict the spring-back by unloading after bending process.

Optimization Design of Drawbead in Drawing Tools of Autobody Cover Panel

2002 ◽  
Vol 124 (2) ◽  
pp. 278-285 ◽  
Author(s):  
Gang Liu ◽  
Zhongqin Lin ◽  
Youxia Bao
Keyword(s):  
Optimization Algorithm ◽  
Optimization Design ◽  
Design Method ◽  
Experimental Results ◽  
Hybrid Optimization ◽  
Force Model ◽  
Hybrid Optimization Algorithm ◽  
Design Plan ◽  
Formed Part ◽  
Restraining Force

In the tooling design of autobody cover panels, design of drawbead will affect the distribution of drawing restraining force along mouth of dies and the relative flowing velocity of the blank, and consequently, will affect the distributions of strain and thickness in a formed part. Therefore, reasonable design of drawbead is the key point of cover panels’ forming quality. An optimization design method of drawbead, using one improved hybrid optimization algorithm combined with FEM software, is proposed in this paper. First, we used this method to design the distribution of drawbead restraining force along the mouth of a die, then the actual type and geometrical parameters of drawbead could be obtained according to an improved drawbead restraining force model and the improved hybrid optimization algorithm. This optimization method of drawbead was used in designing drawing tools of an actual autobody cover panel, and an optimized drawbead design plan has been obtained, by which deformation redundancy was increased from 0% under uniform drawbead control to 10%. Plastic strain of all area of formed part was larger than 2% and the minimum flange width was larger than 10 mm. Therefore, not only better formability and high dent resistance were obtained, but also fine cutting contour line and high assembly quality could be obtained. An actual drawing part has been formed using the optimized drawbead, and the experimental results were compared with the simulating results in order to verify the validity of the optimized design plan. Good agreement of thickness on critical areas between experimental results and simulation results proves that the optimization design method of drawbead could be successfully applied in designing actual tools of autobody cover panels.

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