摘要：The vortex flame design process was investigated. Combine qualitative and CAE （computer-aided engineering） simulation proposed to fulfill the functional requirement. Guidance channel can produce an ornamental flame with acceptable height. The lift mechanism comprises a supporting member and bearing and allows moving to the predetermined height. It allows a user to add fuel and cleaning base parts safely. Rigid body linkage and flow field simulated enables fine tune of geometric parameters. Functional test and measurement are carried out to confirm the product features. The measured average temperature of the metal chassis is 37.25℃, and that of glass is 141℃.

摘要：Synthetic polymer membranes are widely used in many applications,including,among others,water purification,protein separation,and ***,the use of existing polymer membranes faces major challenges,such as the trade-off between permeability and selectivity,membrane fouling,and poor mechanical *** address these problems the authors have focused their research on surface/interfacial tailoring and the structure-property relationship of polymer membranes used in liquid separation *** has been made as follows:(1)a methodology for membrane surface functionalization and nanofiltration(NF)membrane preparation based on mussel-inspired catecholic chemistry was proposed and established;(2)a class of mechanically robust and environmentally-responsive composite membranes with hydrogel pore-filled in rigid macroporous supports was designed and developed;(3)a methodology for surface tailoring and antifouling modification of polymer membranes based on amphiphilic copolymers was created and the scientific implications for amphiphilic polymer membranes elaborated;(4)an adsorption membrane with both filtration and adsorption functions was designed and developed to achieve rapid removal of trace micropollutants,including heavy metal ions,organic dyes,plasticizer,antibiotics,and *** mini-review briefly summarizes this work.

摘要：The performance of an optical system with sensitive line-of-sight(LOS)is influenced by rotational *** view of this,a design methodology is proposed for a passive vibration isolation system in an optical system with sensitive *** vibration is attributed to two sources:transmitted from the mounting base and generated by modal ***,the elimination of the rotational vibration caused by coupling becomes an important part of the design of the isolation ***,the decoupling conditions of the system can be *** the system is totally decoupled,the vibration on each degree of freedom(DOF)can be analyzed ***,the stiffness and damping coefficient on each DOF could be obtained by limiting the vibration transmissibility,in accordance to actual *** design of a vibration isolation system must be restricted by the size and shape of the payload and the installation space,and the layout constrains are thus also discussed.

摘要：NbMoTaW合金是目前研究极广泛的难熔高熵合金之一,具有高熵合金高强度、高硬度、耐磨损的优异性能,但其韧性塑性较差,极大影响了其在工程中的应用。本研究在NbMoTaW合金中添加不同比例的Ti元素以提高该合金的塑韧性,通过相形成参数计算确定了Ti_(x)NbMoTaW系合金的相结构为固溶体相,运用基于密度泛函理论的第一性原理方法计算合金晶格常数、基态能量、形成能及焓变值,分析了合金结构稳定性。通过计算合金不同Ti含量时弹性常数、弹性模量、B/G、泊松比ν、柯西压C_(12)-C_(44)等参数研究了合金弹性性质的变化规律。最后对电子态密度分析得知,合金体系成键共价性降低,金属键增强,弹性性质和态密度的结果表明添加Ti有助于该合金韧性的提高。此研究可为设计、改善难熔高熵合金性能提供一定设计思路和理论指导。

摘要：考虑桩周饱和土和桩芯饱和土的三维波动效应研究了饱和土中管桩群桩的水平振动,得到了管桩群桩的水平动力阻抗。将桩周土和桩芯土视为两相饱和土,并利用多孔介质理论来描述其力学特性。运用数学物理手段求得了桩周饱和土和桩芯饱和土的水平动力阻抗。运用波的传播理论和叠加原理,同时考虑边界条件和三角函数的正交性,求得了管桩群桩中任一根管桩的水平作用力。考虑刚性承台处管桩桩顶位移协调条件和桩顶水平作用力平衡条件,得到了饱和土中管桩群桩的水平动力阻抗。以2×2管桩群桩为例分析和讨论了有关物理参量对饱和土中管桩群桩水平振动特性的影响。研究结果表明:实芯群桩与管桩群桩的水平动力阻抗都存在一定的差异,频率较小时需要考虑桩芯饱和土与桩周饱和土性质的差异对管桩水平动力阻抗的影响,管桩长径比和管桩壁厚对饱和土中管桩群桩水平振动的影响较大,在实际工程设计中需要重点考虑桩身尺寸。

摘要：传统遗传算法搜索速度慢,容易陷入局部最优解.借鉴遗传算法(GA)的思想,利用正态云模型云滴的随机性和稳定倾向性特点,提出一种新的遗传算法—云遗传算法(CGA).CGA由正态云模型的Y条件云发生器实现交叉操作,基本云发生器实现变异操作.最后,进行了函数优化实验和IIR数字滤波器优化设计,并与标准GA、NQGA、CAGA和LARES等算法进行比较,证明了该算法的有效性,具有一定的参考和应用价值.

摘要：电力变压器是直接影响电力系统安全运行的重要设备之一,目前多采用图像或侵入式传感测量的方式,本文设计了变压器声纹采集装置、特征提取方法、以及基于迁移学习的深度神经网络识别模型。首先,采集并预处理变压器噪声信号,对分帧信号进行时域和频域特征提取,获得声纹特征向量,然后,输入迁移学习算法模型,实现变压器直流偏磁、过负荷、以及绕组变形等8种工况的智能识别诊断,最后,设计声纹特征数据库建立方法,采集变压器运行声学样本,对声纹识别算法模型进行训练和优化。通过数据集对比测试和变电站部署应用,验证了算法模型的识别准确度和系统可行性,该装置可作为当前监测手段的有效补充,提高变压器综合监测和潜伏性缺陷识别能力。

摘要：基于5 kW固体氧化物燃料电池(SOFC)电堆,考虑建模仿真—2温度层模型在模型精度与复杂度上做了更好的折中,可以更有效地应用于控制器设计.本文首先对2温度层模型在常用稳态工作点附近采用泰勒级数展开,获得其状态空间方程.然后考虑其安全操作特性,设计了两种带约束的预测控制器:即面向SOFC电堆的快速负载跟踪与燃料亏空控制器与面向SOFC电堆温度安全的控制器.重点分析了不同切换速率工况下的温度及其梯度、功率以及燃料亏空特性,使得系统在快速进行功率跟踪的同时工作在安全范围以内.结果发现随着电流调节速率的增大,跟踪过程虽然加快,但其存在安全风险也相应增大;此外,安全指标相对避免燃料亏空指标而言,对电流调节速率的要求更加苛刻,在控制器设计时必须综合进行考虑.

摘要：以弹性力学薄板屈曲理论为基础,采用能量法并选取满足边界条件的挠曲试函数,借助Python软件自编计算程序,推导了对边简支对边自由板、三边简支一边自由板及四边简支板在轴向均布荷载作用下的屈曲临界承载力计算公式,采用有限元模型分析对结果进行验证,并给出屈曲特征系数ξ与高宽比r的简化关系式。基于面外抗弯刚度和面内轴向刚度相等原则,将带构造柱和圈梁的砌体墙由非均匀各向异性材料等效成各向同性材料,并验证等效模型用于墙体屈曲分析的可靠性。提出可用于不同平面布置形式自承重砌体墙的稳定性设计验算方法,并给出其在两个实际工程中的应用。该文方法操作简便,可考虑砌体墙不同边界条件、构造柱和圈梁布置、自承重墙三角形轴力分布特点等影响,相关结论可供类似工程设计参考。

摘要：基于土体的三维波动模型研究了饱和土中单个管桩的竖向振动。将桩周土和桩芯土视为两相多孔介质,管桩视为等截面的圆管杆单元。在考虑桩周饱和土和桩芯饱和土径向位移和竖向位移的情况下,建立了基于土体三维波动模型的饱和土-管桩竖向耦合振动模型。借助势函数和分离变量法并考虑土体边界条件,求解了考虑土体三维波动的桩周饱和土和桩芯饱和土的竖向振动。在此基础上,考虑管桩桩端边界条件,利用三角函数正交性求解了饱和土中单个管桩的竖向振动,得到了管桩桩顶的竖向复刚度。通过数值算例,对比分析了土体三维波动模型解和不考虑土体径向位移的简化模型解的计算结果,分析了主要桩、土参数对饱和土中管桩竖向振动的影响。研究表明:当管桩壁较薄时且低频时不应忽略土体径向位移的影响,在动态刚度因子和等效阻尼随频率变化曲线峰值峰谷处不宜忽略土体液相的影响,管桩壁不宜过薄。管桩壁厚、长径比、桩芯饱和土与桩周饱和土密度比、剪切模量比以及桩-土模量比对饱和土中管桩竖向振动有较大影响,在进行管桩设计时需要综合考虑相关参数。