K.Palanikumar
,
L.Karunamoorthy
,
R.Karthikeyan
材料科学技术（英）
In recent years, glass fiber reinforced plastics (GFRP) are being extensively used in variety of engineering applications in many different fields such as aerospace, oil, gas and process industries. However, the users of FRP are facing difficulties to machine it, because of fiber delamination, fiber pull out, short tool life, matrix debonding, burning and formation of powder like chips. The present investigation focuses on the optimization of machining parameters for surface roughness of glass fiber reinforced plastics (GFRP) using design of experiments (DoE). The machining parameters considered were speed, feed, depth of cut and workpiece (fiber orientation). An attempt was made to analyse the influence of factors and their interactions during machining. The results of the present study gives the optimal combination of machining parameters and this will help to improve the machining requirements of GFRP composites.
关键词:
Optimization
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null
,
null
,
null
D.F. Wu
,
S.S. Cheng
金属学报(英文版)
Turbulent flow and heat transfer coupled with solidification in slab continuous casting mold was studied by numerical simulation method. Volume of fluid (VOF) model is used to solve steel-air two-phase flow problem and enthalpy-porosity scheme is introduced to solve the fluid flow problem involving solidification. Contributions of various nozzle port angles and port widths and heights on the free surface fluctuation and the thickness of solidifying shell in slab mold were particularly investigated, based on which the structure of submerged entry nozzle was optimized. Flow inside the common nozzle port cannot fill the entire outlet area, having a recirculation in the upper portion of the port, which is enlarged for the nozzle port with both larger height and width. Results show that the flow in mold cavity is mainly controlled by the nozzle port angle. The increase of the angle of upper face of the port to shape a roughly streamlined inner-wall improves the effective area fraction of the nozzle, resulting in less jet impingement, weaker free surface turbulence and thicker solidifying steel shell.
关键词:
continuous casting
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null
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null
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null
Juhua HUANG
,
Jinjun RAO
,
Xuefeng LI
材料科学技术（英）
Sheet metal forming is widely applied to automobile, aviation, space flight, ship, instrument, and appliance industries. In this paper, based on analyzing the shortcoming of general finite element analysis (FEA), the conception of parametric finite element analysis (PFEA) is presented. The parametric finite element analysis, artificial neural networks (ANN) and genetic algorithm (GA) are combined to research thoroughly on the problems of process parameters optimization of sheet metal forming. The author programs the optimization scheme and applies it in a research of optimization problem of inside square hole flanging technological parameters. The optimization result coincides well with the result of experiment. The research shows that the optimization scheme offers a good new way in die design and sheet metal forming field.
关键词:
Sheet metal forming
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null
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null
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null
Huiping YU
材料科学技术（英）
Concepts and techniques of response surface methodology have been widely applied in many branches of engineering, especially in the chemical and manufacturing areas. This paper presents an application of the methodology in a magnetic crystal Czochralski growth system for single crystal silicon to optimize the oxygen concentration at the crystal growth interface in a cusp magnetic field. The simulation demonstrates that the response surface methodology is a feasible algorithm for the optimization of the Czochralski crystal growth process.
关键词:
Czochralski
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null
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null
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null
Zhizhong SUN
,
Henry HU
,
Xiang CHEN
,
Qigui WANG
,
Wenying YANG
材料科学技术（英）
The gating system of a cylindrical magnesium casting has been designed by using multiple objective optimization and Taguchi method. Mold filling and solidification processes were simulated by using MAGMASOFT®. The simulation results indicate that the gating system design has a significant effect on the quality of magnesium castings. In an effort to obtain the optimal design of gating system, the signal-to-noise (S/N) ratio was used to analyze the effect of various gating designs on cavity filling and casting quality by using a weighting method based on the design of an orthogonal array. Four gating system parameters, namely, ingate height, ingate width, runner height, runner width, were optimized with a consideration of multiple objective criteria including filling velocity, shrinkage porosity and product yield.
关键词:
Gating system
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null
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null
,
null
王欢
,
王亮
,
严仲明
,
胡基士
,
王豫
低温物理学报
基于对模型及模型磁场的分析，应用Ansoft磁场分析软件，通过举例的形式提出了一种简单有效的优化方法；并且通过对YBCO高温超导带材临界电流特性以及对抛体线圈磁场的分析，确定了改抛体线圈的临界电流密度；最后通过仿真验证了优化过程的有效性．
关键词:
Ansoft
,
YBCO
,
电磁发射
,
优化
李林生
,
张晓颖
,
杨汝平
,
许小强
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2014.Z1.014
针对某低温贮箱箱底刮伤补强,本文分别进行了小平板试样和大平板试样的缺陷补强优化,最终确定了采用1.2 mm厚、特殊塑料、R75 mm圆形、边缘斜坡过渡、双面粘贴的方式进行补强,缺陷补强后超过了母材强度,达到了优化目标,整箱极限内压试验通过验证了优化结论的正确性.
关键词:
贮箱
,
刮伤
,
补强
,
优化
王荣
,
何钦象
,
祖磊
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2014.04.004
基于微分几何推导出了不等极孔椭球类容器纤维缠绕的非测地线稳定缠绕方程,并根据薄膜理论、层合板理论、蔡-吴失效准则得到了赤道处纤维层的最小厚度1.281 7 mm,计算出的纤维方向的应力小于纤维的极限强度3.92 GPa.发现纤维缠绕椭球容器的应力状态是赤道处最先发生破坏,且会出现局部失效现象.以缠绕层最小质量M为目标函数,蔡-吴失效准则为约束条件,在给定内压5 MPa的情况下,得到了优化后的容器质量为34.072 kg.相比于等极孔的容器而言,非测地线缠绕具有高度非线性、不稳定性及精度难以控制等问题.
关键词:
不等极孔
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纤维缠绕
,
非测地线
,
优化
丁瑞锋
,
冯士超
,
王艳红
上海金属
介绍了国内外典型双渣法少渣炼钢工艺的技术现状及新日铁、浦项、首钢、宝钢和武钢等厂家在转炉排渣制度、枪位操作以及留渣操作等工艺的优化措施.转炉双渣法利用转炉内自由空间大,反应动力学条件优越,生产成本较低,而且操作简单,无需新增设备,引起了国内外、特别是受设备限制的钢厂的广泛关注.
关键词:
转炉
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双渣法
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炼钢工艺
,
优化
