桥面铺装复合梁的有限元分析

采用三维有限元法,分析了复合梁试件模型和实体桥面铺装模型中沥青混凝土铺装层表面的受力特性及其变化趋势。计算结果表明,复合梁模型和实体桥面铺装模型中的沥青铺装层表面的受力状态相同,变化趋势一致,采用试验可控性较好的复合梁试验能够模拟不同结构组合的桥面铺装层受力特性,为大跨径桥梁桥面铺装层结构设计、材料选择提供依据。     

大型活动交通影响评价方法

大型活动吸引和产生的突增交通量会造成周边地区的交通拥挤。通过比较大型活动与大型商业建设项目的交通影响评价特点和分析大型活动交通管理的影响因素,分别针对“提供一次性服务的大型活动”和“提供长效服务的大型活动”,设计了交通需求的预测方法。以交叉口服务水平分析方法为基础,提出一种了大型活动的交通影响评价方法。以长春市南岭体育场举办的“中国足球甲A联赛”为对象,运用Vissim微观交通仿真软件对所提出的方法进行了初步验证。结果表明,在大型活动条件下,所提出的方法能够确定需要进行交通管制的空间范围。     

现浇预应力混凝土连续箱梁桥设计

结合某主线上一座2×30 m现浇连续预应力混凝土葙梁桥的工程实例,较详尽的介绍了该桥的设计和构造特点、上部结构计算及上下部构造设计,并结合实际针对设计时应考虑的一些因素进行了较详细的探讨.     

Modeling research on manufacturing execution system based on large-scale system cybernetics

A cybernetics model of manufacturing execution system(MES CM) was proposed and studied from the viewpoint of cybernetics.Combining with the features of manufacturing system, the MES CM was modeled by"generalized modeling"method that is discussed in large-scale system theory.The mathematical model of MES CM was constructed by the generalized operator model, and the main characteristics of MES CM were analyzed.     

A data model applied to the knowledge-based ICAS

Image-guided computer aided surgery system (ICAS) contributes to safeness and success of surgery operations by means of displaying anatomical structures and showing correlative information to surgeons in the process of operation. Based on analysis of requirements for ICAS, a new concept of clinical knowledge-based ICAS was proposed. Designing a reasonable data structure model is essential for realizing this new concept. The traditional data structure is limited in expressing and reusing the clinical knowledge such as locating an anatomical object, topological relations of anatomical objects and correlative clinical attributes. A data structure model called mixed adjacency lists by octree-path-chain (MALOC) was outlined, which can combine patient's images with clinical knowledge, as well as efficiently locate the instrument and search the objects' information. The efficiency of data structures was analyzed and experimental results were given in comparison to other traditional data structures. The result of the nasal surgery experiment proves that MALOC is a proper model for clinical knowledge-based ICAS that has advantages in not only locating the operative instrument precisely but also proving surgeons with real-time operation-correlative information. It is shown that the clinical knowledge-based ICAS with MALOC model has advantages in terms of safety and success of surgical operations, and help in accurately locating the operative instrument and providing operation-correlative knowledge and information to surgeons in the process of operations.     

应用离心造粒法制备盐酸二甲双胍微丸的研究

目的研究离心造粒粉末层积法制备盐酸二甲双胍微丸。方法采用多功能微丸包衣造粒机制备微晶纤维素空白丸芯和盐酸二甲双胍微丸,并且通过产率、粒径和粒径分布、堆密度、表面形态和圆整度、脆碎度和释放度对盐酸二甲双胍微丸进行质量评价。结果以盐酸二甲双胍∶乳糖∶微晶纤维素=100∶5∶3的比例,主机转速150 r/min,喷浆泵转速20 r/min,供粉速度25 r/min,滚圆6 min,进行制备微丸,获得了很好的效果。结论所制备的盐酸二甲双胍微丸圆整度好,粒径均匀,硬度合格,流动性好,释放完全,无骨架结构。     

超大型预制桥墩吊装过程数值计算

以某跨海工程超大型预制桥墩吊装方案为例,基于有限元分析软件ANSYS建立超大型预制桥墩的数值模型,施加重力场模拟吊装过程,得到了吊装过程中桥墩的受力状态,评定了吊装方案的优劣。针对吊装过程中桥墩及吊装件较危险的受力区域进行分析,提出了优化建议。     

基于Moldflow的仪表面罩熔接线验证与结构优化

建立了分析模型,应用Moldflow软件对仪表面罩进行了注塑仿真分析。分析结果表明了熔接线位置,将其与实际零件熔接线缺陷进行了对比验证;同时从仪表面罩结构设计角度提出了可行性解决方案,并总结了在零件结构设计过程中导致熔接线缺陷的关键要素。对比验证结果表明:模流分析能有效指导优化仪表面罩结构,从而减少零件试模次数,提升零件质量,降低制造成本,缩短设计周期。     

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大数据所涉及的信息量规模巨大,大数据技术使得人类认识世界的思想及方法发生变革。智慧物流是利用集成化、智能化、移动化技术,使物流系统具有思维、感知、学习、推理判断和自行解决物流中的某些问题的能力,它包含了智能运输、自动仓储、动态配送及智能信息的获取、加工和处理等多项基本活动,为供方提供最大化的利润,为需方提供最佳的服务,同时也应实现消耗最少的自然资源和社会资源,从而形成完备的智慧物流综合管控体系。论坛的主题是大数据与智慧物流,面向大数据技术在智慧物流领域的应用问题,着重研讨大数据背景下智慧物流体系、理论和方法,推动我国现代物流行业健康有序协调发展。     

EA4T车轴钢的超声冲击表面强化

利用超声冲击设备对EA4T车轴钢进行了表面强化处理.采利用金相显微镜和透射电镜表征了车轴钢表面结构的变化,并对超声冲击处理前后试样表面粗糙度和显微硬度进行了分析.结果表明:经超声冲击处理后,试样表面发生了剧烈的塑性变形,晶粒明显细化,显微硬度呈梯度化.随着超声冲击功率的增加,变形层厚度增加,粗糙度减小,表面硬度增大;与未经超声冲击处理的试样相比,在超声冲击功率180瓦作用下,表面粗糙度降低了6.5倍,试样的表面硬度提高了25%,变形层厚度大约为80μm.