Topological Optimization Method for Aeronautical Thin-Walled Component Fixture Locating Layout

Fixture locating layout has a direct and influential impact on aeronautical thin-walled component(ATWC)manufacturing quality.The purpose is to develop a topological optimization method for ATWC fixture locating layout to minimize the manufacturing deformation.Firstly,a topological optimization model that takes the stiffness of ATWC as the objective function and the volume of the locating structure as the constraint is established.Secondly,ATWC and the locating structure are regarded as an integrated entity,and the variable-density method based topological optimization approach is adopted for the optimization of the locating structure using ABAQUS topology optimization module(ATOM).Thirdly,through a subsequent model reconstruction referring to the obtained topological structure,the optimal fixture locating layout is achieved.Finally,a case study is conducted to verify the proposed method and the comparison results with firefly algorithm(FA)coupled with finite element analysis(FEA)indicate that the number and positions of the locators for ATWC can be optimized simultaneously and successfully by the proposed topological optimization model.

Location Service Information Supporting System Based on Ontology

In order to solve the problem of how to collect and manage large amount of location information and improve the accuracy of location service, interactive information supporting system based on ontology and location service is presented in this paper. It can transmit special information about users＇ location to front-end instantaneously, so it is very convenient for their daily life. It makes full use of the available wireless communication, which is easy to arrange and convenient for users.

Location and allocation problem for spare parts depots on integrated logistics support

In equipment integrated logistics support(ILS), the supply capability of spare parts is a significant factor. There are lots of depots in the traditional support system, which makes too many redundant spare parts and causes high cost of support. Meanwhile,the inconsistency among depots makes it difficult to manage spare parts. With the development of information technology and transportation, the supply network has become more efficient. In order to further improve the efficiency of supply-support work and the availability of the equipment system, building a system of one centralized depot with multiple depots becomes an appropriate way.In this case, location selection of the depots including centralized depots and multiple depots becomes a top priority in the support system. This paper will focus on the location selection problem of centralized depots considering ILS factors. Unlike the common location selection problem, depots in ILS require a higher service level. Therefore, it becomes desperately necessary to take the high requirement of the mission into account while determining location of depots. Based on this, we raise an optimal depot location model. First, the expected transportation cost is calculated.Next, factors in ILS such as response time, availability and fill rate are analyzed for evaluating positions of open depots. Then, an optimization model of depot location is developed with the minimum expected cost of transportation as objective and ILS factors as constraints. Finally, a numerical case is studied to prove the validity of the model by using the genetic algorithm. Results show that depot location obtained by this model can guarantee the effectiveness and capability of ILS well.

Combined support mechanism of rock bolts and anchor cables for adjacent roadways in the external staggered split-level panel layout

Using the spatial structure of the external staggered split-level panel layout,a combined support technology for adjacent roadways was developed and analyzed for a rock bolt and anchor cable mechanism.The influence of the side rock bolt and anchor cable parameters on the mechanical properties of the anchorage body and the support stress distribution of the lateral coal body were revealed using the FLAC3D software.The optimal support parameters of the side rock bolts and anchor cables were subsequently determined,and the support effect of gob-side entry in a mining scenario was verified.The results show that the support of the side rock bolts and anchor cables improves the mechanical properties and stress state of the anchorage body,producing a good protective effect on the coal body of the air-intake entry roof and side wall.This is beneficial to the stability of the side wall and the realization of the suspension effect for roof rock bolts and anchor cables,which in turn makes the surrounding rock maintenance of the gob-side entry to a thick coal seam more favorable.

Prediction of Eukaryotic Protein Subcellular Location Using a Novel Feature Extraction Method and Support Vector Machine

The rapidly increasing number of sequences entering into the genome databank has created the need for fully automated methods to analyze them.Knowing the cellular location of a protein is a key step towards understanding its function.The development in statistical prediction of protein attributes generally consists of two cores: one is to construct a training dataset and the other is to formulate a predictive algorithm.The latter can be further separated into two subcores: one is how to give a mathematical expression to effectively represent a protein and the other is how to find a powerful algorithm to accurately perform the prediction.To predict the subcellular location of eukaryotic protein,a systematic prediction approach comprised of a novel feature extraction method,an idea of combining this feature extraction method with support vector machine(SVM) algorithm,and ’one-versus-rest’ & ’all-versus-all’ strategies have been proposed in this paper.Consequently,the total predictive accuracies reach 95.5% for four locations.Compared with existing methods,this new approach provides better predictive performance.For example,it is 13.5%,5.1% higher than Yuan’s and Hua’s methods respectively.These results demonstrate the applicability of this new method and concept and possible improvement of prediction for the protein subcellular location.It is anticipated that the current approach may also have a series of impacts on the prediction of other protein features.

水箱安装支架级进模设计

通过对安装支架的冲压工艺及单工序模成形进行分析,确定采用11道工序的级进模进行成形。为保证条料的同步移动和送料顺畅,下模采用浮动顶料机构,还介绍了条料的粗定位和精定位。模具经试冲,结果表明:设计的排样方案和模具结构合理可行,能满足安装支架的大批量生产需求。

球帽和Locator附着体种植覆盖义齿的临床疗效评价

目的:评价球帽附着体和Locator附着体应用于种植覆盖义齿的临床效果。方法:纳入无牙颌患者67例,共植入150颗Straumann或Bego种植体,完成球帽式或Locator式种植覆盖义齿修复。定期随访复查,包括修复后生物并发症和机械并发症情况和患者满意度调查。采用SPSS 17.0软件统计分析。结果:完成随访58例,球帽组35例,Locator组26例,球帽改Locator组7例。生物并发症比较显示,球帽组的牙龈增生发生率明显高于Locator组(P<0.05);球帽组和Locator组的机械并发症发生率无显著差异(P>0.05),但Locator组各类机械并发症的发生次数少于球帽组,球帽组平均修理频次为1.9次,Locator组为0.9次;Locator组患者对咀嚼和固位的满意度高于球帽组,不同性别的患者满意度无差异,满意度与患者的年龄和随访时间无相关性。结论:Locator式种植覆盖义齿相比球帽式种植覆盖义齿,临床效果具有一定优势。

Locator附着体种植覆盖义齿在肿瘤切除术后牙列缺失修复中的应用

目的：口腔颌面部肿瘤切除手术及其他治疗对颌骨造成的创伤可能会对口腔重建修复和功能恢复造成一定的困难。本文旨在介绍口腔颌面部肿瘤术后患者采用Locator附着体支持式种植覆盖义齿修复牙列缺失的应用方法，探讨解决无牙颌导致义齿固位不良的修复新方法。方法：对6例颌面部肿瘤切除术后牙列缺失患者，在颌骨内植入种植体，3~4个月后进行Locator附着体支持的种植覆盖义齿修复，并对其进行定期复查及种植覆盖总义齿满意度情况调查。结果：种植术后，通过1~5年的临床观察，所有种植体均无松动、脱落，Locator附着体支持式种植覆盖义齿固位良好。种植体植入后及负载后X线片对比，显示种植体-骨结合良好，种植体颈部无明显骨吸收。患者戴用Locator基台种植覆盖义齿，义齿的稳定性有明显改善，咀嚼效率提高，使用效果满意。结论：对口腔颌面部肿瘤切除术后的患者，Locator附着体种植覆盖义齿修复提高了义齿的固位力和稳定性，从而改善了患者的咀嚼效率。另外，其摘带、清洁及维护较为方便，这些都大大增强了患者的生活质量及使用信心。但是，Locator附着体种植覆盖义齿仍无法弥补因肿瘤手术导致的面部外形的改变。

基于大数据技术的LNG加注站智能选址方案设计

为实现“双碳”目标,国家大力推动交通清洁能源的使用,因此合理布局和建设LNG加注站就非常重要。基于交通车辆卫星定位数据的算法技术,运用机器学习模型和大数据架构等先进技术,实现对LNG加注站的智能识别,并对路段流量和LNG重卡加注行为进行智能统计分析,搭建站点价值分析模型,进行LNG加注站的规划布局和建站选址。根据对交通大数据的分析,确定了全国6000余个LNG加注站的位置分布和其中的高价值站点,借助地图进行标注并打造加注站数据系统,大幅度提高了LNG加注站选址的科学性及效率。

二或四枚种植体支持的Locator覆盖义齿修复五年回顾

目的:比较下颌牙列缺失患者分别采用2枚或者4枚种植体支持的Locator覆盖义齿,修复5年后的临床效果。方法:选取采用2枚种植体(A组)和4枚种植体(B组)支持Locator覆盖义齿患者分别为20例、15例。评估2组患者满意度(整体满意度、咀嚼能力、说话适合性、固位和稳定性、舒适度),并检测咀嚼效率和边缘骨吸收值。结果:两组病人在整体满意度、咀嚼能力、说话适合性、固位和稳定性、舒适度及咀嚼效率、边缘骨吸收方面均无显著性差异(P>0.05)。结论:Locator种植覆盖义齿无论是采用2枚还是4枚种植体,5年后均能获得很好的临床效果,患者满意度高,但对其远期临床效果还有待观察。对于有可能出现义齿旋转的患者建议种植4枚种植体。

5G信道状态信息信号质量及指纹定位性能分析

5G信道状态信息(channel state information,CSI)具有丰富的特征信息,是一种理想的指纹定位信号,但信号质量易受环境干扰,对定位性能影响较大.为了分析不同因素对5G信号质量和定位性能的影响程度,本文首先阐述了5G信号特征和基于支持向量回归(support vector regression,SVR)的定位算法,分析了数据采集时终端的高度、方向、人体遮挡等因素对信号质量的影响,测试了廊厅、小办公室和中型会议室三种场景下的定位性能.结果表明:5G信号质量受周围环境影响较大,在干扰较小的情况下,基于5G CSI的位置指纹定位算法在三种场景下的定位精度分别为0.93 m、1.46 m和1.94 m,能够满足大多数室内定位应用需求.

苏州某大型复杂商业连体结构设计

苏州某大型商业综合体项目位于7度抗震设防烈度区,为体型重叠建筑。通过5道防震缝将建筑整体划分为购物中心A区、购物中心B区、停车楼、商业街A区、商业街B区五个独立结构单元。购物中心A区为复杂连体高层建筑,1~5层采用框架-剪力墙结构,两个单体在3~5层中区由钢桁架相连,顶部(6层)钢桁架结构与两个单体通过成品球铰支座连接,形成强连体结构。充分考虑了周期比、位移比双指标平衡后对购物中心A区剪力墙布置进行了优化;屋顶钢桁架结构支座采用变刚度设计,局部设置滑动支座解决恒载下杆件应力比较高的问题。通过性能化设计,该复杂结构连体部位可以满足中震弹性、大震不屈服的性能目标要求。性能化设计及专项分析表明,影院钢结构具有良好的抗震性能、楼盖舒适度及防倒塌性能。

基于流固耦合的静压转台底部支撑优化

静压转台油腔的变形会降低静压转台的承载能力,底部支撑点的布局会显著影响油腔的变形量和底部支撑点的应变量。为了提高静压转台的工作能力,提出一种基于流固耦合的静压转台底部支撑布局重构方法。建立静压转台流固耦合模型,基于有限元方法得到静压转台在额定负载下油腔的变形量和底部支撑点处的应变量,利用MATLAB拟合底部支撑点半径和间距对变形和应变的影响规律,得到底部支撑布局的最佳参数。最后对静压转台底部布局进行重构,并通过试验验证其可靠性。结果表明:重构后油腔变形降低了约19.25%,底部支撑点处应变降低了约29.80%。

复杂载荷下的核管路支架智能布置

当前,核电管路支架布置通过人工试算反复迭代来实现,存在劳动强度大、设计周期长、成本高等缺点。借助管路有限元力学分析,提出一种基于粒子群-遗传混合算法的三维空间核电管路支架智能布置方法。布置示例表明,所提方法可在管路的三维全局空间内自动布置不同功能的多个支架,在满足《压水堆核岛机械设备设计和建造规则》设计规范的同时减小了工作量。

集成电路工厂Fab中实验室布局分析

集成电路工厂实验室已逐渐成为建厂的标准配置,其在集成电路生产厂房(Fab)中的位置选择上需考虑洁净流线、空间需求、微振控制、电磁控制等因素,在工艺布局中需考虑设备之间的联系、设备排水排液与收集、设备电磁防控以及职业卫生等要求,本文针对实验室在Fab中的位置选择和工艺布局,给出了一些建议并有针对性的进行了优缺点对比分析,为集成电路工厂实验室的位置选择与布局设计提供参考。

石化装置中配管专业塔器设计探究

现代生活中,化工产品无处不在,人们对化工产品的需求也在不断提高。化工装置中动静设备有很多,而塔器在化工装置中起着至关重要的作用,它决定了整个装置的产品种类及其收率。当前,针对塔的工程设计,不仅要对塔器内构件进一步的优化,其管道的布置及相应的设计也会从很大程度上影响和决定装置能否正常运行。结合设计工程实例从塔的平面布置、开口方位、平台布置及其管道布置等方面展开讨论。

鱼腹式拉索柔性支架系统构造设计研究

该文以复杂山地鱼腹式拉索柔性支架系统结构设计需求为出发点,从基础选型设计、钢支架(立柱)设计、组件布置方式等方面入手,研究鱼腹式拉索柔性支架系统具体构造,同时结合中核独山县基长农业光伏电站项目的实际施工应用及经验,对该柔性支架系统的应用过程以及效果进行评价,同时为该形式的柔性支架系统技术创新及发展提供有价值的参考。

铁路工程机制砂场选址布局与规模能力研究

利用机制砂替代河砂作为混凝土细骨料,成为近年来部分铁路建设项目解决河砂短缺问题的有效措施。《铁路机制砂场建设技术规程》(Q/CR9570-2020)的颁布,统一了机制砂场建设技术要求,有利于保证工程质量。但其中对机制砂场位置与规模选定缺乏详细分析,不便于建设项目勘察设计阶段临时工程设计。因此,需对机制砂场位置与规模选定开展研究分析,提出铁路建设勘察设计阶段机制砂场位置与规模能力的参考方法,为推动机制砂材料在铁路工程建设中的高质量应用提供支撑。

上社煤矿双巷掘进巷道布置及支护设计研究

以上社煤矿9217双巷掘进工作面为研究对象,采用UDEC数值模型分析了双巷掘进阶段及首工作面回采过程中不同煤柱尺寸下裂隙扩展演化及围岩变形特征。确定了合理的煤柱宽度为12 m,并设计了9217回风顺槽锚索支护参数。将方案成功应用于上社煤矿的工程实践中,取得了理想的围岩控制效果,显著提高了开采效率,同时缓解了开采接替紧张的问题。

广西生态公益林区划现状及布局优化调整对策

生态公益林在保障地区生态安全方面具有不可替代的重要作用。广西是生态环境比较脆弱的地区,同时又是南方重要的商品林区。通过分析广西壮族自治区生态公益林区划布局现状及存在的问题,提出针对该区生态公益林的布局优化调整对策,建议以布局优化调整及建立经营管护机制为主要技术手段对广西生态公益林体系构建进行完善,进而推动地区整体生态环境可持续发展,保障社会生态安全,以达到促进该区生态环境更加优良、结构更加优化的目标。