The Establishment of Performance Evaluation Index Based on Enterprise Structure Adjustment

This paper mainly makes a performance evaluation for the industrial structure adjustment of the industrial enterprises, establishing a set of evaluation index system. It uses the mathematics statistics knowledge and management knowledge to establish a scientific and operable performance evaluation model for the industrial structure adjustment of the industrial enterprises. Based on the model, it can make a performance evaluation for the internal industrial structure adjustment of the industrial enterprises and also it can evaluate the performance of the industrial structure adjustu^ent of different industries.

Total plant performance evaluation based on big data: Visualization analysis of TE process

The performance evaluation of the process industry, which has been a popular topic nowadays, can not only find the weakness and verify the resilience and reliability of the process, but also provide some suggestions to improve the process benefits and efficiency. Nevertheless, the performance assessment principally concentrates upon some parts of the entire system at present, for example the controller assessment. Although some researches focus on the whole process, they aim at discovering the relationships between profit, society, policies and so forth, instead of relations between overall performance and some manipulated variables, that is, the total plant performance. According to the big data of different performance statuses, this paper proposes a hierarchical framework to select some structured logic rules from monitored variables to estimate the current state of the process. The variables related to safety and profits are regarded as key factors to performance evaluation. To better monitor the process state and observe the performance variation trend of the process, a classificationvisualization method based on kernel principal component analysis(KPCA) and self-organizing map(SOM) is established. The dimensions of big data produced by the process are first reduced by KPCA and then the processed data will be mapped into a two-dimensional grid chart by SOM to evaluate the performance status. The monitoring method is applied to the Tennessee Eastman process. Monitoring results indicate that off-line and on-line performance status can be well detected in a two-dimensional diagram.

Carbon materials toward efficient potassium storage:Rational design,performance evaluation and potassium storage mechanism

Potassium-ion batteries(PIBs)are potential“Beyond Li-ion Batteries”candidates for their resource advantage and low standard electrode potential.To date,the research on PIBs is in its early stages,the most urgent task is to develop high-performance electrode materials and reveal their potassium storage mechanism.For PIBs anode materials,carbon with tunable microstructure,excellent electrochemical activity,nontoxicity and low price is considered as one of the most promising anode materials for commercialization.Although some breakthrough works have emerged,the overall electrochemical performance of the reported carbon anode is still far away from practical application.Herein,we carry out a comprehensive overview of PIBs carbon anode in terms of three aspects of rational design of structure,performance evaluation criteria and characterization of potassium storage mechanism.First,the regulation mechanism of key structural features of carbon anode on its potassium storage performance and the representative structural regulation strategies are introduced.Then,in view of the undefined performance evaluation criteria of PIBs carbon anode,a reference principle for evaluating the potassium storage performance of carbon anode is proposed.Finally,the advanced characterization techniques for the potassium storage mechanism of carbon anode are summarize.This review aims to provide guidance for the development of practical PIBs anode.

Seismic Performance of Dry-Friction Devices in Shear-Frame Buildings

In recent years the application of friction-based passive energy dissipation devices have been proven very effective in reducing structural response to earthquake excitations and also implemented for a large number of buildings. Their design heavily relies on numerical simulations to model the influence of the energy dissipation devices. The modeling of friction forces must be accurate for realistic simulation of the influence of these devices. In state-of-the-practice, the hysteretic behavior of friction devices has been typically modeled with Coulomb friction having a constant coefficient of friction. However, the basic laws for typical sliding materials and experimental investigations show non-linear relationship between friction and sliding velocity, which includes stiction and Stribeck effect. The influence of stiction and Stribeck effect may be significant and can not be ignored in simulating the dynamic responses of structures with friction-based energy dissipation devices. In this paper the optimal performance of dry friction device in shear-frame buildings when subjected to earthquake ground motions has been investigated. The focus of this paper is on the optimal minimization of response of the shear-frame building. Since buildings with friction devices behave in a highly nonlinear manner, nonlinear response-history analysis considering comprehensive sliding friction models has been carried out. The performance has also been evaluated using the various response measures： the maximum absolute acceleration, the maximum base shear, and the maximum inter-story drift. Different performance indices have been used to quantify the influence of the device properties.

基于Perform-3D的剪力墙结构动力弹塑性分析

介绍了在Perform-3D中实现剪力墙结构动力弹塑性分析所需的技术知识,并对个别参数取值给出了建议,同时以某超高层剪力墙结构为例,阐述了应用Perform-3D进行动力弹塑性分析和性能评估的过程,最后对Perform-3D尚需完善改进的功能进行了展望。

基于性能的通航桥梁抗船撞评估方法及应用研究

为合理有效地开展通航桥梁抗船撞性能评估,提出基于性能的桥梁抗船撞标准化评估方法。基于现行《公路桥梁抗撞设计规范》(JTG/T 3360-02-2020),从抗撞性能等级确定、设防代表船型确定、船撞力计算、船撞效应计算以及抗撞性能验算等方面,采用结构性能目标作为评估准则,建立桥梁抗撞性能评估各环节流程的标准化评估方法。以江苏扬中三桥为应用实例,运用该方法进行该桥20号墩抗撞性能评估,结果表明:20号墩桩基顺桥向抗弯性能不满足JX1级要求,其余验算结果满足要求,桥墩抗撞性能综合评估结果为不满足要求。参照评估结果该桥加装了浮动式防撞设施。桥梁抗撞性能评估标准化,可准确高效实现桥梁抗撞性能等级确定、船撞效应计算、抗撞性能验算等预期的评估功能要求。

基于OBE理念的汽车构造性能与使用教学模式研究

实施基于成果导向的课程教学模式改革,意在调动学生学习的主动性、积极性和创造性,提高课堂教学的综合功效,进一步发挥课堂教学在专业人才培养中的主渠道作用。结合人才需求为导向,基于成果导向教育(OBE)理念,分析汽车构造性能与使用课程的教学现状,围绕课程目标和毕业要求,从调整教学内容和整合课程资源、将课程思政纳入教学内容、加大平时考核权重等方面进行教学设计,旨在为交通运输类课程教学改革提供思路。

面向使用性能的金属增材制造点阵夹芯产品检测评价方法研究

限于点阵结构多尺度特征、增材制造特种工艺所带来的缺陷萌生以及产品服役所面临的复杂力—热环境,金属增材制造点阵夹芯结构在产品化,尤其是批生产过程中面临性能一致性检测、性能裕量评价等难题。为此,针对金属增材制造点阵夹芯产品开展面向使用性能的检测评价方法研究,在总结金属增材制造点阵夹芯产品宏观变形特征及微观缺陷特征基础上,分析了变形及缺陷常用检测方法,对比其适用性及优缺点。针对工程实践中不易检和不易判读的指标项目,以及性能评价模型尚未完善导致宏观力学性能预测精度不足的现状,提出成形精度、缺陷无损检测与力学性能定制化测试相结合的面向产品使用性能的检测评价方法,并针对安装板开展实例化应用。创新方法包括缺陷检测中的拉偏试样佐证、内部多余物控制等,力学性能定制化测试中的随炉件与平行件思想、普检与抽检思想,以实现产品性能一致性和性能裕量全面评价。

区域高速铁路网络性能的多维度评估指标对比研究

针对高速铁路网络性能评估问题,目前研究中存在多种维度和特征的评估指标,缺乏不同指标间的比较分析。选择站点拓扑维度指标(度中心性DC、接近中心性CC、介数B),站点功能维度指标(关键性SI、重要性SC、强度SS),以及网络整体维度指标(集聚系数、网络密度、平均路径长度),应用于京津冀、东北、西南3个区域的高速铁路网络性能评估,比较并分析了不同维度指标的特征、相关性和适用性。结果表明:SC指标可以量化不同区域高速铁路网络的差异,B指标对于拓扑简单的网络适用性差;DC,SI,SC,B 4个指标之间的相关性较强,而CC,SS2个指标与其他指标相关性较弱;京津冀地区高速铁路网络的连通性、密集程度均大于其他两地区,网络聚集系数评估区域高速铁路网络性能时会导致不合理的结果。

Deployment Dynamic Modeling and Driving Schemes for a Ring-Truss Deployable Antenna

Mesh reflector antennas are widely used in space tasks owing to their light weight,high surface accuracy,and large folding ratio.They are stowed during launch and then fully deployed in orbit to form a mesh reflector that transmits signals.Smooth deployment is essential for duty services;therefore,accurate and efficient dynamic modeling and analysis of the deployment process are essential.One major challenge is depicting time-varying resistance of the cable network and capturing the cable-truss coupling behavior during the deployment process.This paper proposes a general dynamic analysis methodology for cable-truss coupling.Considering the topological diversity and geometric nonlinearity,the cable network's equilibrium equation is derived,and an explicit expression of the time-varying tension of the boundary cables,which provides the main resistance in truss deployment,is obtained.The deployment dynamic model is established,which considers the coupling effect between the soft cables and deployable truss.The effects of the antenna's driving modes and parameters on the dynamic deployment performance were investigated.A scaled prototype was manufactured,and the deployment experiment was conducted to verify the accuracy of the proposed modeling method.The proposed methodology is suitable for general cable antennas with arbitrary topologies and parameters,providing theoretical guidance for the dynamic performance evaluation of antenna driving schemes.

氢燃料电池单体性能一致性评价方法与分析

为能够更全面的评价燃料电池单体性能一致性和延长燃料电池堆的使用寿命,采用主成分分析法来探究阳极气体流量、阴极气体流量、冷却水流量、电压、温度和效率因素间的耦合关系,且基于分析结果,提出了一种改进的单体性能评价指标,并与燃料电池稳态试验结果进行对比分析,验证了该评价指标的有效性。最后在该评价指标下,分析了不同电池数量、气体歧管直径和冷却水歧管直径对燃料电池单体性能的影响。分析结果表明,减少单体数量、增大气体歧管直径和冷却歧管直径能够提高单体性能的一致性,其中气体歧管主要影响电压一致性,冷却水歧管主要影响温度一致性。

层次分析法和熵权法模糊综合评价水泥混凝土路面结构性能

为了解决因旧水泥混凝土路面的结构性能评估结果经验性较强而无法为旧水泥混凝土路面改造成沥青路面决策方案提供有效理论依据的问题,基于结构性能评价指标和统计学方法构建水泥混凝土路面结构性能模糊综合评价模型,从表面、内部和整体结构状况3个方面分别对旧水泥混凝土路面进行结构性能评价;基于模糊评价法建立模糊关系矩阵,采用层次分析法和熵权法确定综合权重向量,得到综合评价向量和综合评价等级,并利用所构建模型和我国相关行业标准中的路面结构强度指数模型,对上海市奉贤区和浙江省嘉兴市的4段水泥混凝土路面FX-A、 FX-B、 JX-A、 JX-B进行实例分析。结果表明:通过所构建模型得到各路段按结构性能从优到差的顺序为JX-A、 JX-B、 FX-B、 FX-A;与我国相关行业标准中的路面结构强度指数模型相比,所构建模型的评价结果更符合实际路面结构性能。

在役型钢再生混凝土组合结构损伤智能监测系统关键技术研究

再生粗骨料由于其自身的局限性对型钢再生混凝土组合结构的长期使用性能存在一定的影响,对在役型钢再生混凝土组合结构的长期性能需进一步探究。基于此,本文在计算机视觉技术的基础上建立型钢再生混凝土组合结构外观损伤(裂缝)识别模型,将超声检测技术与深度学习方法相结合建立在役组合结构内部损伤变化和损伤位置监测,并基于BIM平台构建型钢再生混凝土组合结构长期使用过程结构损伤智能监测系统。该研究为型钢再生混凝土组合结构长期使用性能的监测与预测提供了新方法。

基于有限元分析的高频片上耦合电感器性能对比与优化设计

耦合电感器是一种利用电磁感应原理实现电能转换和传输的器件,它在信号传输、电子设备等领域有着广泛的应用和重要的意义。然而,传统的耦合电感器通常需要线圈和铁芯等结构,这使得其电感值受到器件尺寸的限制,而且还会产生寄生电容和电阻等不利因素,影响其性能和效率。因此,如何设计和优化耦合电感器的结构,提高其性能指标,是当前研究的热点和难点。本文对比研究了三种不同结构的耦合电感器,分别是双曲折耦合电感、八边形螺旋耦合电感和上下结构的双面耦合电感。目的是探讨不同结构对耦合电感器性能的影响,为优化设计和应用提供指导。本文采用了有限元分析和电路仿真的方法,计算和比较了各种结构的耦合电感器的电感感值、耦合系数、品质因数等性能指标。结果表明,双曲折耦合电感具有最高的品质因数和输出电压,适合于高效率的无线能量传输;八边形螺旋耦合电感具有最高的耦合系数和电感感值,适合于高频率的信号传输;上下结构的双面耦合电感制作简单、成本较低,适合于紧凑型的电子设备。本文为不同应用场景下的耦合电感器的选择和优化提供了参考依据,也为进一步提高耦合电感器的性能和可靠性提出了一些改进方向。

粮食平房仓“结构-隔热”一体化墙板热工性能研究

为了提高散装粮食平房仓墙体保温隔热性能,提出了一种新型“结构-隔热”一体化墙板(SIW墙板)。通过试验和数值模拟,分析了保温板厚度、连接件等对SIW墙板热工性能的影响,揭示了内、外叶墙板温度、热流密度随时间的变化规律,得到了SIW墙板的传热系数,基于传热系数指标开展了SIW墙板在不同储粮生态区的适用性评价。结果表明:相较于传统平房仓砖砌墙体,保温板厚度为50 mm和80 mm的SIW墙板传热系数分别降低了45.81%和56.13%;GFRP连接件在SIW墙板中的热桥效应不显著,对墙板温度场的影响较小;相较于保温板厚度为50 mm的SIW墙板,80 mm厚的SIW墙板能满足3个储粮生态区对粮食平房仓墙体传热性能的要求。

槽钢加固上海市南市区图书馆旧址整体移位数值分析及其关键部位变形监测

石库门里弄住宅是近现代重要史迹及沪上代表性建筑,展示着特定时期城市文化的沉淀。以上海市南市区图书馆旧址工程为例,采用槽钢内撑外拉的方式对整体结构进行了加固,利用既有建筑整体移位技术对该砖-木混合结构进行了顶升和平移,采用位移传感器监测了结构在平移过程中关键部位的位移响应;采用ABAQUS有限元软件建立了上海市南市区图书馆旧址工程的整体有限元模型,得到了结构在顶升、平移过程中关键部位的位移响应,并将模拟结果与实际位移监测结果进行了对比;基于验证的有限元模型,开展了参数分析研究,分析了顶升和平移速率及地面平整度对结构位移响应的影响,评估了结构的受力和安全状态。研究可为城市更新中历史建筑的整体移位技术提供参考。

改性纳米二氧化硅耐温微球调驱剂的合成与性能评价

以丙烯酰胺(AM)、丙烯酸(AA)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)为合成原料,以纳米二氧化硅为载体,γ-(甲基丙烯酰氧基)丙基三甲氧基硅烷(KH-570)为改性试剂,采用乳液聚合法制备了一种具有“核-壳”结构的改性纳米二氧化硅微球,并对其化学结构、溶胀倍率以及微观形貌进行了表征;同时,研究了在不同溶胀时间、温度以及矿化度条件下的膨胀性能;通过填砂管模型驱替实验,研究了改性微球在不同条件下的封堵能力、调剖能力。结果表明,改性微球的成球性好,平均粒径80 nm;50℃时,纯水中溶胀5~10 d后,微球颗粒的溶胀倍率可达2.9~3.9。同时,该微球具有较好的耐温、耐盐性能,在温度<90℃、矿化度<10000 mg/L时,能保持较好的溶胀性能。此外,用作调驱剂,微球的平均封堵率达85%以上;渗透率级差1∶5时,微球的剖面改善率为59.6%。

服役15年大跨跨海预应力混凝土梁桥荷载试验及结构性能评价

大跨预应力混凝土梁桥因其结构刚度大、行车平顺舒适、抗震性能好、施工技术成熟等优势得到广泛应用,该类桥梁在服役较长时间后,由于自然环境和超载的长期影响可能导致结构出现裂缝,并影响结构的安全承载能力,这一问题对于跨海桥梁显得尤为突出。因此,为准确评估在役跨海混凝土桥梁的实际工作状态与承载能力,通过对一座已服役15年的大跨跨海预应力混凝土梁桥进行现场静载、动载试验,并结合有限元对其振型等特性进行了分析。研究结果表明,桥梁结构的工作性能仍保持良好,但由于所处海域环境及长期服役导致的结构损伤和裂缝的影响,使其实际承载能力有所下降。研究成果可为在役同类桥梁的维修加固提供参考。

非抗震钢筋的既有RC框架结构抗震性能评估研究

为评估采用非抗震钢筋的既有钢筋混凝土框架结构,对比分析了钢筋强屈比、超屈比和伸长率对构件性能的影响,论述了结合钢筋材料抽样检测和大震弹塑性时程分析的既有框架结构抗震性能评估方法,实现了定量分析非抗震钢筋三项抗震材料指标对结构性能的影响。通过一栋既有住宅建筑,展示采用上述评估方法复核大震作用下结构与构件的性能状态。结果表明,尽管非抗震钢筋达不到抗震钢筋的材料指标要求,但大震作用下构件满足设定的性能水准要求,构件损伤形成了“强柱弱梁”的破坏形态,结构满足设定的抗震性能目标。

火力发电厂延寿改造结构检测与抗震评估

目前我国发电行业主要依靠火力发电,由于工艺设备的多样性,火电厂的建筑结构相对于民用更为复杂。而在二十世纪八九十年代修建的电厂将面临着新一轮延寿改造的可能,势必会在电厂结构检测与评估方面迎来新的挑战。现场实地核查和检测电厂主厂房结构材料强度、结构变形等情况,综合分析了结构的现状并对其抗震性能做出评价,以期为同类工程的检测和加固提供一定参考。