大容量电解槽电解车间厂房通风结构形式的探讨

随着铝工业的发展,铝电解槽向着大容量发展,散发到厂房中的热量也随之增加,致使目前传统厂房建筑结构形式下的自然通风风量不足,特别在夏季自然通风风量不足的现象尤为明显,这不仅影响到了电解槽的热平衡,更重要的是使车间的操作面温度升高,导致操作环境变差,不利于操作工的身体徤康。因此该文特研究探讨自然通风条件下铝电解车间不同厂房通风结构形式,通过对各种厂房结构形式下影响通风的因素分析与仿真计算,得岀各种类型铝电解厂房自然通风形式,找出了目前不同地区不同情况的电解厂房结构,供设计人员参考。     

钢结构在铝工业大型工业厂房的应用和发展

简述了目前钢结构的发展趋势、结构受力性能、环境保护状况,结合铝工业厂房的特点和实际应用实例,阐述了近几年钢结构在铝工业大型工业厂房中的应用和发展,为铝工业进军国际市场奠定了技术基础。     

重型单层钢结构厂房的结构设计特点

在冶金工业厂房设计中,为了满足生产的需要,厂房设置起重量超过100 t的吊车,厂房属于重型厂房。针对重型厂房的特点,结合相关规范要求和设计经验,阐述了设计要点和设计应注意的事项等,确保厂房结构的安全和经济。     

新型建筑结构铝电解厂房的提出与分析

针对目前在我国常用的二层结构铝电解厂房的自然通风不适应大容量电解槽的现状。提出了新型建筑结构的铝电解厂房,并通过CFD模拟计算的方法,研究了该铝电解厂房形式的自然通风效果。分析了新型建筑结构的铝电解厂房的自然通风影响因素。     

“复合焊”方法在网架空心球上的应用

焊接球节点网架近几年在我国发展很快,随着这种结构型式在体育馆(场)、大型商场及工业厂房的广泛应用,网架焊缝的可靠性和经济性越来越受到设计单位和施工单位的重视,目前国内焊接球网架空心球大都采用普通手工电弧焊(下称手工焊),其生产效率和焊接质量     

可持续理念下的老旧厂房改造空间再生分析

工业时代的厂房创造了社会财富，然而随着城市发展的演变与调整，城市中许多旧工业建筑厂房被弃用，历史的印迹逐渐消失，同时也造成了工业建筑的浪费。近年来，伴随艺术家创新意识的提高和可持续理念的发展，通过改造和空间再生让旧工业厂房有了新的生存形式。大多设计师开始合理地利用废弃的工业厂房，结合其城市的发展脉络、工厂自身的建筑特色等，应用艺术手法以及创新理念改造其空间。文章以江苏省常州市恒源畅厂房改造为例，通过文献研究法与调查研究法对老旧厂房改造空间设计的相关策略进行分析，指出应将“空间再生”的概念引用到城市更新与调整中，让旧工业建筑以另一种身份大放异彩，并再次为社会创造财富。     

双层厂房在铸造车间的应用

介绍了国内外双层厂房的使用情况和结构特点；铸造车间厂房适宜的层数主要根据工部特点及工艺要求决定；论述了双层厂房设计过程中的局限性和应注意的问题。     

某工业厂房加固改造主要结构设计

随着技术的进步与建筑安全标准的不断提高,建筑工程加固改造技术发展越来越快,对原有建筑物的加固改造已逐渐成为建筑业的重要组成部分。文中阐述了某厂房的加固改造设计方法,特别是针对原有混凝土结构与新增钢结构连接节点难以处理的问题,提出了合理的加固设计方法和新颖的节点设计方式。     

SY500电解槽技术进步与展望

近年来,随着国内铝工业的快速发展,500 kA级别电解槽技术成为国内指标好、总体产量最大、运行槽数量最多、人均产量高、经济效益好的电解槽技术,在国内新建的电解系列中得到了广泛应用。本文以SY500电解槽为主,介绍了第一代,第二代,第三代SY500电解槽的发展和应用历程。全面分析了SY500电解槽采用的突破性新技术,如新式阴极结构技术,外补偿母线技术,平衡网络母线技术,新式厂房通风结构技术等的原理和应用效果。     

选矿类厂房建筑结构设计要点

选矿类厂房因作业生产联系紧密、动力设备多,振动噪音大,有别与其它类型厂房,设计时应从厂房结构选型、布置及设备基础型式选择等方面综合考虑。     

玉龙铜矿硫化矿选矿产品方案的优化选择

通过对玉龙铜矿湿法冶金工艺中的硫化铜矿石选矿方案进行比较,阐述了生产铜硫混合精矿比生产单一铜精矿和硫精矿,具有以下特点:不仅简化了选矿工艺流程,减少了选矿药剂的消耗,降低了精矿和浸渣的脱水成本,同时,还简化了精矿焙烧的生产工艺和管理,改善了洗涤效果,保护了环境,提高了铜回收率,其经济效益十分显著。     

表面反应功能结构制造领域的研究现状及发展趋势

表面反应功能结构是指在反应载体表面加工出具有不同形貌、不同尺度、不同维数,并具有反应功能的结构。表面反应功能结构设计和制造是微反应器大规模推广应用的核心技术。文中在对当前表面反应功能结构的表现形式和主动设计方法分析基础上,较详细论述了表面反应功能结构新的制造技术,指出未来表面反应功能结构研究的重点应集中在不同功能结构的优选、特定功能结构的主动设计以及适合不同反应功能结构的高效、低成本制造方法探索等方面。     

等离子体浸没离子注入与沉积技术的发展及前沿问题

表面热功能结构是指在固体表面加工出具有不同形貌、不同尺度、不同维数,并具有散热或传热功能的结构。复杂表面热功能结构在高集成度芯片热控制方面有着广阔的应用前景。如何根据热功能需求主动设计表面结构并提出适合高效率低成本的制造方法是解决高热流密度问题的核心所在。在对当前表面热功能结构的发展现状分析基础上,较详细论述了表面热功能结构制造领域的关键技术,指出未来表面热功能结构研究的重点应集中在结构的微细化和复杂化、表面热功能结构的高效低成本制造方法等方面。     

含缺陷结构极限分析的权余法研究

结构极限分析是塑性力学的一个分支,在结构及机械设计中有广泛的应用.由于工程应用中受各种因素的影响,使得结构存在各种各样的缺陷.对该类结构进行极限分析研究,能反映结构的实际安全程度,而且能充分利用材料塑性性能的潜力.本文利用权余法中的配点法和子域法,结合塑性极限分析理论对含缺陷板和含缺陷圆柱壳结构进行了承载能力分析,得到了一些有意义的结果.     

Engineering of elastic domain structures in a constrained layer

The theoretical analysis and phase-field modeling of elastic domain structures in constrained layers depending on their misfit and thickness are presented. Domain diagrams that demonstrate how different domain structures can be obtained by manipulating parameters of constraints are constructed for a model system with cubic–tetragonal transformation. It is shown that depending on the misfit, three-domain stress-free structures (hierarchical and cellular) and two-domain uniaxially stressed structures are the equilibrium states for relatively thick films. When the film thickness decreases, the area of a three-domain hierarchical structure shrinks and disappears followed by the disappearing cellular domain structures. In thin films, two-domain structures with asymmetric architectures are stable at negative symmetric misfit (in-plane contraction), while two-domain structures with symmetric domain architectures are stable at positive symmetric misfit (in-plane expansion). The results of the phase-field modeling are discussed in connection with the experimental data available for film/substrate ferroelectric heterostructures.     

Modal analysis of second-harmonic generation of generalized Lamb waves in layered planar structures

This research has developed an approach for studying second-harmonic generation of generalized Lamb waves (GLWs) in layered planar structures. On the basis of a modal analysis approach and second-order perturbation treatment, an effective theoretical model has been established. The material non-linearity can result in second-harmonic generation by primary GLWs propagating in layered structures, and the non-linearity is treated as a second-order perturbation of the elastic response of primary GLW propagation. There are second-order bulk and surface/interface driving sources in layered planar structures when primary GLWs propagate. These driving sources can be thought of as the forcing functions of a series of double frequency GLWs (DFGLWs) in terms of the approach of modal expansion analysis of guided waves. The total second-harmonic displacement fields consist of a series of DFGLWs in the stress-free layered structures. Thus, the complicated problem of second-harmonic generation of GLWs can be determined exactly within the second-order perturbation regime. Despite the strongly dispersive nature of primary GLWs in layered planar structures, it is found that the second harmonics of primary GLWs can grow with propagation distance along layered structures when the phase velocities of the DFGLWs are equal to those of the primary GLWs. Also, the formal solution of the second harmonics of the primary GLWs are presented. Numerical simulations were performed to understand the physical process of second-harmonic generation by primary GLW propagation in layered structures. The potential application of the present results to practical inspections of layered structures is discussed.     

Fatigue and fracture issues of welds in civil structures

Abstract

Fatigue and fracture events occurring in bridge structures built in the 1960s and 1970s are reviewed and methods used to repair damaged structures are outlined. One of the most important factors is the design lifetime of structures, usually considered to be more than 100 years. The means of guaranteeing the performance of structures throughout their lives with minimum cost is an engineering issue of increasing importance.     

数控回转头压力机机身结构分析

介绍了Ｃ形、Ｏ形和Ａ形三种数控回转头压力机的机身结构，分析了它们的特点，指出了各种机身的应用场合。     

二元合金Laves相结构的PLS分析

运用模式识别的偏最小二乘法(PLS)对AB2合金MgCu2型(C15)和MgZn2型(C14)Laves相进行研究,得出了影响二元合金Laves相结构的判据．对于由非过渡一过渡元素、过渡一过渡元素组成的合金,价电子密度是影响其Laves相结构的主要原因;对过渡一镧系(锕系)元素组成的合金,B原子的价电子数对其Laves相结构影响最为明显,且价电子和原子半径对Laves相结构的影响作用互为反向．     

Evaluation of light-weight AlSi10Mg periodic cellular lattice structures fabricated via direct metal laser sintering

Aluminium alloy porous structures are highly demanded for many applications such as light-weight aerospace and heat exchanger products. Conventional manufacturing methods such as casting, however, faces difficulty in making aluminium alloy complex periodic cellular lattice structures with designed unit cell shape and size and volume fraction. This study evaluates the manufacturability and performance of AlSi10Mg periodic cellular lattice structures fabricated via direct metal laser sintering (DMLS). Various lattice structures at different volume fractions and unit cell sizes are designed by repeating a unit cell type called “diamond”. Due to the self-supported feature of the diamond unit cell, low volume fraction (7.5–15%) AlSi10Mg periodic cellular lattice structures can be fabricated by the DMLS process with the unit cell sizes ranging from 3 mm to 7 mm. A good geometric agreement is found between the original design structure models and the DMLS made structures, but the strut sizes of the DMLS made structures are slightly higher than the designed values and thus pore sizes decrease. There is clear relationship between the compressive modulus and strength of the structures and their volume fraction and unit size. Hence, this study shows that light-weight aluminium structures can be designed and made with the controlled unit size and volume fraction and the predicted mechanical properties.