摘要：研究了具有随机参数天线结构基于概率的优化设计问题。同时考虑了结构物理参数、几何尺寸和作用荷载等的随机性;应用有限元方法与结构可靠性理论对抛物面天线反射面精度的可靠性和结构单元强度、稳定性和可靠性进行了分析;在此基础上构建了基于概率的天线背架结构优化设计模型。对8m口径天线结构的优化结果表明:文中提出的天线结构分析和优化设计模型与方法是合理可行的。

摘要：目前国际上点对点激光通信技术已较为成熟,但多平台间组网通信问题仍未能解决。提出了一种新型组网通信光学天线设计方法,可实现多点间同步双工激光通信。分析了光学天线原理,并通过仿真建模验证了设计理论,给出了光学天线的结构设计和工作模式,最后采用数学最优控制算法推导出多组光学天线多平台动态、双工通信的工作范围,当旋转抛物面开口为300 mm时,能使方位角为360°,俯仰范围为90°以上。并针对GEO(高轨道卫星)—GEO—OGS(光学地面站)间的组网通信要求进行了光学天线的初始化设计,对推动激光通信技术实现大范围宽领域应用具有重要意义。

摘要：针对康养产品设计的需求可靠性和多目标耦合性问题,提出基于博弈理论和感性意象的设计决策优化模型,旨在提升产品更新迭代的精准预判性。在获取用户需求后,采用合作博弈模型,基于用户需求与设计目标的相关性矩阵求解博弈效用以筛选需求,并定义为设计需求。分析设计需求要素,通过感性意象词汇和样本的收集与筛选,结合主成分分析进行造型创新,构建设计要素矩阵。采用非合作-合作博弈串行模型,基于产品并行设计的评价目标进行决策优化,确定整体最佳方案。以家用磁阻划船机为例,结合博弈论的理性角度和感性意象的感性角度进行分析,得到产品的创新设计方案,通过用户满意度验证该方法的可行性和有效性,为产品设计提供了新的思路和方法。

摘要：在室内有效模拟作物复合群体内的光环境,是深入研究作物间作套种分子生态机理的基础。该文首先设计了一种用于植物室内培养的发光二极管(LED)照明灯具,其主要特点包括:选用蓝光、红光、远红光3种对作物生长发育影响最大的高功率LED灯珠为光源,按照1:3:3的比例进行组合,从而形成光照均匀的光源板;应用散热片、风道、风扇对光源板进行有效散热;采用脉宽调制(PWM)方式实现每种灯辐射强度的连续、独立调节。为进一步验证其功能,以玉米-大豆套作模式为例,根据田间自然光环境和两作物复合群体内光环境的实际测定值,采用所设计的灯具进行2种光环境的模拟。通过对光环境和作物生长指标的测定,结果表明,此法成功模拟了作物间作套种田间光环境,光照均匀性好,大豆生长一致,表现出典型的避荫性反应。

摘要：In actual production,deep coal mine roadways are often under typical static-dynamic coupling stress(SDCS)conditions with high ground stress and strong dynamic *** the increasing number of disasters and accidents induced by SDCS conditions,the safe and efficient production of coal mines is seriously ***,it is of great practical significance to study the deformation and failure characteristics of the roadway surrounding rock under *** this paper,the effects of different in-situ stress fields and dynamic load conditions on the surrounding rock are studied by numerical simulations,and the deformation and failure characteristics are *** to the simulation results,the horizontal stress,vertical stress and dynamic disturbance have a positive correlation with the plastic failure of the surrounding *** these factors,the influence of the dynamic disturbance is the most *** the same stress conditions,the extents of deformation and plastic failure of the roof and ribs are always greater than those of the *** effect of horizontal stresses on the roadway deformation is more notable than that of vertical *** results indicate that for the roadway under high-stress conditions,the in-situ stress test must be strengthened *** determining the magnitude of the in-situ stress,the location of the roadway should be reasonably arranged in the design to optimize the mining *** roadways that are strongly disturbed by dynamic loads,rock supports(rebar/cable bolts,steel set etc.)that are capable of maintaining their effectiveness without failure after certain dynamic loads are *** results of this study contribute to understanding the characteristics of the roadway deformation and failure under SDCS,and can be used to provide a basis for the support design and optimization under similar geological and geotechnical circumstances.

摘要：设计了用于BF-5电子直线加速器的X射线转换靶。采用蒙特卡罗模拟程序优化计算了靶材厚度;设计了转换靶的冷却结构,并采用有限元方法模拟计算了水冷效果;依据设计的结构参数,计算了转换靶产生X射线的剂量分布及能谱分布。结果表明:靶体温度控制在40℃以下,转换靶在该条件下能够长期稳定工作;X射线平均能量为0.65MeV,在转换靶正前方1m处吸收剂量可达6Gy/min。

摘要：为避免高热值垃圾焚烧时可能导致的炉排受热烧损现象,本文以某型号水冷炉排为研究对象,在管道截面相同的条件下,仿真研究了3种内部管道排布方式(折线型、波浪型、回型)在4种不同垃圾热值及4种不同冷却水流速条件下的散热性能。结果表明:折线型水冷炉排适用于垃圾热值变化范围小的垃圾焚烧炉,而波浪型水冷炉排适用于垃圾热值变化范围大的垃圾焚烧炉,对高温环境下强制水冷炉排的设计具有一定参考价值。

摘要：：In today＇s networks, load balancing and priority queues in switches are used to support various quality-of-service （QoS） features and provide preferential treatment to certain types of traffic. Traditionally, network operators use ‘traceroute＇ and ‘ping＇ to troubleshoot load balancing and QoS problems. However, these tools are not supported by the common OpenFlow-based switches in software-defined networking （SDN）. In addition, traceroute and ping have potential problems. Because load balancing mechanisms balance flows to different paths, it is impossible for these tools to send a single type of probe packet to find the forwarding paths of flows and measure latencies. Therefore, tracing flows＇ real forwarding paths is needed before measuring their latencies, and path tracing and latency measurement should be jointly considered. To this end, FlowTrace is proposed to find arbitrary flow paths and measure flow latencies in OpenFlow networks. FlowTrace collects all flow entries and calculates flow paths according to the collected flow entries. However, polling flow entries from switches will induce high overhead in the control plane of SDN. Therefore, a passive flow table collecting method with zero control plane overhead is proposed to address this problem. After finding flows＇ real forwarding paths, FlowTrace uses a new measurement method to measure the latencies of different flows. Results of experiments conducted in Mininet indicate that FlowTrace can correctly find flow paths and accurately measure the latencies of flows in different priority classes.

摘要：Information storage and corresponding encryption/decryption are highly important owing to the prevalence of counterfeit activities and information leakage in the current age. Herein, we propose a novel method to store information via controllable ionoprinting onto fluorescent hydrogel for hierarchical and multi-dimensional *** incorporating pyrene moieties and carboxylic groups into polymeric hydrogel network, fluorescence changing and controllable shape deformation behaviors could be achieved and integrated by ionoprinting of Fe3+ions. The diffusion of Fe^3+ions into fluorescent hydrogel can quench the fluorescence of pyrene moieties, and chelate with carboxylic groups to generate anisotropic structures for shape deformation simultaneously. Thus, fluorescence quenching-based 2D information and actuation-based 3D information could be hierarchically decrypted when exposed to UV light and being put into water, respectively. Importantly, the stored information could be erased by replacing Fe^3+with H^+, which allows the fluorescent hydrogel as a recyclable information storage material. This work may provide new insights in designing and fabricating novel soft devices for hierarchical and multidimensional information encryption, against the rising problems of counterfeiting and confidential information disclosure.

摘要：针对传统定位工作台速度和定位精度低的缺点,提出了一种采用定子铁心和相互垂直分布的两对推力绕组做定子、动子平台,以及附着在其下表面的4个Halbach磁阵做动子的动磁型同步表面电机.采用分离变量法获得了表面电机磁场强度、磁通量密度、磁通量、反电动势和电磁推力的表达式,并分析了磁阵厚度、节距、极数、线圈厚度和空气隙长度等不同设计参数对表面电机推力的影响,得到了在最大推力下表面电机的设计参数.将计算结果与二维有限元结果进行对比,证明了分析方法的正确性和参数计算方法的可靠性,为进行表面电机动力学建模和仿真,以及伺服控制系统的开发和设计提供了研究基础.