CAE Simulation Research Articles

塑性加工シミュレーションと最適化技術

塑性加工シミュレーションと最適化技術

J122016 炭素繊維複合材料組紐角柱衝突吸収体の最適設計

This paper deals with a multi-objective optimization problem of crushing energy absorption of CFRP (Carbon Fiber Reinforced Plastic) braided composites. At first, this paper has tried to use simplified braiding through integration point methodology to obtain the crushing simulation of CFRP tri-axial braided square tube by using LS-DYNA. Then the influence of edge size, thickness of outer wall and height of the CFRP braided square tube to the absorbing behaviors and the crushing peal force has been investigated. This design problem has been formulated as a multi-objective design optimization problem considering the maximization of specific energy absorption and the minimization of crushing force during energy absorption. The response surface approximation technique was adopted to get the Pareto optimum with CAE simulation of crushing. Finally, the Pareto solutions were found for the optimum design of CFRP braided square tube.

Dynamics Analysis of Coupler Base on Spatial 7R Mechanism

A simulation model of coupler based on spatial 7R mechanism is built up by using ADAMS. Kinematics and dynamics of the coupler are analyzed. Further analysis of the coupler stress during the coupler turning is conducted by ANSYS, which provides theoretical foundation for the design of the coupler. The analyzation of the kinematics and dynamics of the coupler by CAE simulation software lays a good foundation for the practical application and further analysis of the coupler.

Study and Application of CAE Simulation in Die-Casting Die Design

The CAE simulations of filling and solidification processes for die-casting are studied. Numerical analysis is presented for a practical die-casting part using HZ CAE software. The temperature distributions and filling states in solidification and filling process are presented. Then the deficiencies of the part are predicted. Based on the analyzing results, the two die halves are modified and the die-casting parameters are adjusted. The service life of the revised die is increased from 12,000 shots to 20,000shots. It is proved that CAE simulation results can offer a helpful reference for die-casting die design.

Optimization of Process Parameters for Warpage Minimization on Injection Molding Thin-Walled Parts

In this paper, Taguchi experimental design method is applied, and injection molding CAE simulation analysis is conducted. Influence factors of warpage of products are analyzed. According to the results of ranking, influence factors of warpag are the packing pressure, packing time, melt temperature and mold temperature. The packing pressure is the most important influence factor. To get the best level combination of various factors, mixed level orthogonal experimental design is applied to the optimization. Optimal levels of combination process parameters are obtained and the quality of injection products is greatly improved.

Application of Optimization Algorithms in Injection Molding Process Parameters

The data of process parameters and quality index from CAE simulation orthogonal test is used as training samples, the BP neural network is trained and the neural networks ensemble approximate calculation agent model of the relations between processing parameters and the quality index of product are obtained. The agent model with a clear mathematical formula calculates quickly and accurately, so it can optimize globally by the genetic algorithm. The best group of process parameters is obtained and a multi-objective optimization of the quality index of products is realized.

Comparison of results from empirical ALT test to CAE simulation for wireless clients

PurposeThe purpose of this paper is to investigate how to reduce the time and cost required to conduct reliability testing. With increasing competition in the electronics industry and reduction in product life cycles, it is essential to diminish the time required for new product development and thus time to market.Design/methodology/approachThis study conducts empirical sample test for wireless card and analyzes the fatigue life through finite element modeling (FEM). Simulation results are compared to the data collected from a temperature cycling test under conditions of −40°C to 150°C and −40°C to 100°C.FindingsAssuming that the results of product lifetime from empirical sample test and software simulation exhibit a linear relationship, a “scale factor” should exist for any given product structure, process condition and materials composition scenario. The scale factors were found to be approximately 0.1 in both temperature cycling scenarios. Also, the effectiveness of various adhesive dispensing patterns on solder joint reliability is evaluated through software simulation. The L shape adhesive dispensing was proven to effectively enhance the fatigue life of chip scale package solder joints roughly 100‐fold.Originality/valueThe scale factor is used to convert the results from software simulation to empirical sample test for a given set of processing environments and materials. This helps to reduce the time and cost required to conduct reliability testing.

Research on Simulation Technology for Auto Panel in Drawing Forming Based on Autoform

The features and functions of Autoform software for sheet metal forming simulation were introduced. Taking the auto panel as an example, based on UG and Autoform, the process of CAE simulation analysis on the drawing process was stated in this paper and the simulation results were analyzed. The results of analyses indicated that the crack tendency was in the two salient of auto panel flange in the drawing process. By optimizing and adjusting the parameters of mold, the problem of crack tendency was solved. The optimal stamping process was finally determined based on the results of the simulation. Compared with the traditional stamping technology and die designing, the quality of die designing was improved by adopting CAE technique.

The Research and Application of Nuclear Power Valve Steel Casting by CAD / CAE Simulation Design and Refining Technology

With China cast CAE / InteCAST, we analyzed the ordinary valve casting parameters of solidification process, flow and heat transfer, and frequency smelting refining furnace used in the process of feeding wire, argon technology in the intermediate. Comparison-ray testing and physical anatomy of the results, we developed nuclear power valve steel casting process parameters. The results showed that the software forecast casting the shrinkage tendency of value; frequency smelting refining controlled sulfur, phosphorus and aluminum content; products fully comply with the ASTM A216/A216M overcome hot cracking defects, improving the casting ability of anti-fatigue.

Design of U-shape milled groove conformal cooling channels for plastic injection mold

Besides the solid free-form fabrication technology, milling operation is an alternative applicable method to make complex cooling channels conform to the surface of the mold cavity. This paper presents the U-shape milled groove conformal cooling channels and proposes the design optimization process in order to obtain an optimal cooling channels’ configuration and target mold temperature. The relation between the cycle averaged thermal behavior of the mold cavity and the two-dimensional configuration of cooling channels was first investigated thoroughly by an analytical method. Design of experiment and 2D simulation were done to obtain the mold wall temperature and to check the feasibility of the analytical method. The optimization process of the free-form conformal cooling channels is based on the combination of both analytical method and 3D CAE simulation. The analytical step relies on explicit mathematic formulas, so it can approach the neighboring optimal solution quickly. Subsequently, the three-dimensional heat transfer simulation is applied to fine-tune the optimization results. A case study for a plastic car fender was investigated to verify the feasibility of the proposed method. The results show that conformal cooling channel gives a uniform cooling, reducing the cooling time and increasing the molded part’s quality with less effort of plastic designers and high computational efficiency.

SCS Micro-lens 패턴 적용 휴대폰 도광판 제작용 미세금형 제작에 대한 연구

BLU(back light unit) is one of kernel parts of LCD(liquid crystal display) unit. New 3-D micro-lens pattern for LGP(light guide plate), one of the most important parts of LCD-BLU, had been researched. Instead of dot pattern made by chemical etching or laser ablation, SCS(slanted curved surface) micro-lens pattern was designed with optical CAE simulation. This study introduce the method of design using optical CAE simulation for SCS micro-lens, the new fabrication method of micro-mold with SCS micro-lens pattern.

F206 オムロンのCAE活用・推進戦略 : 2020年を見据えたオムロンのCAE活用・推進戦略と適用事例(F2.企業におけるCAEの適用,フォーラム)

F206 オムロンのCAE活用・推進戦略 : 2020年を見据えたオムロンのCAE活用・推進戦略と適用事例(F2.企業におけるCAEの適用,フォーラム)

2312 表面貼付型ICチップ冷却網形態の設計法(OS6-3 設計と最適化III-トポロジー設計-,OS6 設計と最適化)

IC chips are used in almost all modern electronic devices, such as computers and cell phones, and are essential for our lives. But the IC chip temperature rises steeply caused by the downsizing of IC chips and high density of circuits. So countermeasures against heating up are one of the important issues for the IC chips because the increased IC chip temperature causes malfunction. However, the traditional countermeasures such as the cooling fan and the heat sink of regular pattern have a limitation in their cooling performance. So we have focused on the cooling channel with superior cooling performance. In this report, a design method of cooling pathway by utilizing the optimality of branching system has been suggested because it is said that branching system in nature is optimum structures for many purposes. And the cooling performances of the proposed design method have been evaluated from both methods of CAE simulation and an experiment, and by comparing the results of the conventional design method.

Vehicle and Occupant Safety Protection CAE Simulation

Vehicle and Occupant Safety Protection CAE Simulation

Key Technologies in the Design of a Vacuum Die Casting Mould for Aluminum Alloy Joints

Aluminum alloy joints are a key component of a light-weight bus body, hence, they have a complicated structure and high strength requirement. A vacuum die casting mould has been developed and joints have been manufactured using a CAE simulation, a “whole-process-vacuum exhaust” vacuum die casting process and a decreased cross-section design for vacuum-pumping. The joint’s internal porosity has been noticeably reduced and its mechanical properties have been considerably improved in comparison with joints manufactured from die casting.

Technical Study on Neural Network Intelligent Setting for GAIM Processing Parameters

The defects in gas-assisted injection molding are mainly caused by processing parameters improper adjustment. The model for artificial neural network was developed, and was trained through the software platform MATLAB. By the bridle-wise network, the experimental parameters could be set quickly and intelligently. The correctness of these parameters was validated by CAE simulation.

ピエゾアクチュエータを用いたMRI対応グリッパの開発(機械力学,計測,自動制御)

This paper proposes an MRI compatible robotic gripper using piezoelectric actuators with strain amplification mechanisms. The structure of the gripper is designed based on reverse action tweezers. This gripper utilizes the piezoelectric effect for sensing the force and the displacement. The physical properties of the gripper are calculated from elasticity of both actuator and gripper. The dimensions of the gripper are determined by taking the elastic properties of both the actuators and gripping mechanism into account. The performance of the assembled gripper was confirmed by CAE simulation and experiments. The sensing accuracy of the gripping force and the displacement of the tip of the developed gripper were evaluated through the experiments.

F2-2 オムロンにおけるCAEの活用 : 仮説検証型技術開発の取り組み(F2. 企業におけるCAEの適用(1))

F2-2 オムロンにおけるCAEの活用 : 仮説検証型技術開発の取り組み(F2. 企業におけるCAEの適用(1))

A RE-CAE methodology for re-designing free shape objects interactively

The paper represents the contribution to the PUODARSI (Product User-Oriented Development based on Augmented Reality and Interactive Simulation) research project in the development of a design environment which integrates modeling tools and CAE simulation capabilities. Typically, aerodynamic and mechanical performances of the object shape are in contrast with the stylistic requirements. Integrated tools and numerical simulations are then needed to support designers during the conceptualization of a new shape or when re-designing a product. This work combines Reverse Engineering methodologies and CAE tools to easily analyze the interaction between the aerodynamic behavior and the stress-strain state, due to viscous and pressure loads, of a physical object. A friendly interactive tool, based on MatLAB® and linked to Comsol Multiphysics®, was developed to drive user during the simulation and the visualization of results.

Simulation-enabled casting product defect prediction in die casting process

In current casting industries, product development paradigm is shifting from traditional trial-and-error in the workshop to CAE-enabled simulation and ‘proof-of-concept’ by computer. The product development paradigm shift is thus from heuristic know-how and experience to more scientific simulation, evaluation, analysis and calculation. CAE simulation plays an important role in the new product development paradigm as it models the entire casting process and reveals the dynamic behaviour of the casting system in working conditions. In addition, the product quality panorama and product defects are explored via simulation in such a way that the root-causes of casting defects are pinpointed and the solutions to avoid them can be determined. In this paper, the CAE technology for casting process simulation is presented. The modelling of the casting process is first articulated and the detailed simulation issues are then described. The information related to the filling and solidification process and after-ejection behaviour are revealed by CAE simulation. Through case studies, how the CAE simulation helps identify and predict the process-related defects is illustrated and its efficiency is finally validated.