摘要：In this paper, we consider the design of interconnected H-infinity feedback control systems with quantized signals. We assume that a decentralized static output feedback has been designed for an interconnected continuous-time LTI system so that the closed-loop system is stable and a desired H-infinity disturbance attenuation level is achieved, and that the subsystems＇ measurement outputs are quantized before they are passed to the local controller. We propose a local-output-dependent strategy for updating the quantizers＇ parameters, so that the overall closed-loop system is asymptotically stable and achieves the same H-infinity disturbance attenuation level. Both the pre-designed controllers and the quantizers＇ parameters are constructed in a decentralized manner, depending on local information.

摘要：The strength and endurance of human limbs can be enhanced through equipping exoskeletons or other types of wearabledevices. However, long-time use of such devices may cause musculoskeletal disorders (MSDs) or potential injuries due toexternal shocks and vibrations. Consequently, preventing potential risks and enhancing comfortability are crucial to the designof exoskeleton. This research introduces a novel hybrid rigid-soft knee joint exoskeleton, which is well flexible and supportedby two curved beams. This design is friendly and comfortable for wearers. The stiffness of the curved beam is meticulouslycalibrated to match the natural need of the knee joint, which provides appropriate support under vibration and impact. Weemploy the analytical modeling, finite element method (FEM), numerical analysis, and experimental approaches to analyze thestatic and dynamic properties of the knee exoskeleton system. The results confirm that the exoskeleton system exhibits reducedvibration transmissibility in low-frequency environments, and present a new methodology for the design and mechanicalanalysis of exoskeleton systems.

摘要：Address the design of state feedback H ∞ suboptimal controllers. Through parameterization of decentralized controllers, the design condition for the feedback gain is given in the form of a biaffine matrix inequality. An iterative algorithm based on linear matrix inequality(LMI) is proposed to obtain the decentralized controller which ensures the closed loop system asymptotically stable and the H ∞ norm less than constant number 1.

摘要：近现代以来,"白蛇故事"以京剧、地方戏、话剧、电影、电视剧等诸多样式纷纷呈现。1952年田汉创作的京剧《白蛇传》与1992年电视剧《新白娘子传奇》得到了最为广众的收视与欣赏。两者从广义上都属于线性叙事结构,京剧以场面及场面的连接来推衍情节,而电视剧则用屏幕的声画艺术来表达。然而,电视剧与戏曲在情节线布局上也有差异,传统戏曲一般从动作表现的宽度展开,电视剧则从情节的长度延伸。戏曲重视在情节长度上"压缩"、强调集中整饬,电视剧则追求情节的铺展与延续。正是由于两者叙事结构的这些差异,在将同一故事演绎于舞台与屏幕时,对其原有情节的择取与安排也是不尽相同的。

摘要：随着社会的发展,对技术应用型人才的需求量大幅增加,高职技术院校犹如雨后春笋,不断增加的高职类院校,为企业生产和社会进步的人才需求提供了保障。但是与此同时,迅猛增加的高职院校所暴露出来的问题也日益明显。该文就目前高职院校发展中存在的问题和人才培养模式的转变探索进行简单的讨论。

摘要：针对圆钢管混凝土柱-RC梁角节点,提出了对角节点的节点区采用多段钢环加固的构造方案,并对加固节点模型的轴压性能开展有限元分析研究。通过已有研究成果验证了有限元模型分析方法的可靠性,继而采用ABAQUS有限元分析软件建立152个加固节点模型进行轴压试验模拟。有限元分析结果表明,以多段钢环加强的圆钢管钢筋混凝土柱-RC梁角节点轴压性能优于普通节点,加固节点具有更高的轴压承载力和更好的延性,加固效果明显。参数分析表明:加固角节点的轴压承载力随节点混凝土轴心抗压强度、节点区钢环体积占比和节点区纵筋配筋率的增加而增加;角节点的轴压承载力受梁端剪力影响,较大的梁端剪力可能造成节点延性降低。根据分析结果,建立了节点区采用钢环加固的圆钢管约束混凝土柱-RC梁角节点的轴压承载力算式,供设计该类节点参考。

摘要：近年来,随着征兵的热潮,每年全国广播电视都会围绕“强国必须强军,军强才能国安”的重要指示精神,制作出一批征兵主题的公益宣传片,这些宣传片在一定程度上能够激发广大青年参军报国的热情,从而达到宣传的效果和目的。本文将从符号学的视角出发,以近几年我国主流媒体所发布的征兵广告为例,对征兵广告中的媒介形象进行具体分析和研究。

摘要：针对红外视频时空显著性检测问题,提出一种基于Gestalt优化的方法。设计基于多尺度局部稀疏表示和局部对比度测量的方法计算红外视频的空间显著性;为提取视频中显著性目标的运动信息,设计基于多帧对称差分的算法计算时间显著性;为得到初始时空显著图,设计基于交互一致性的融合策略将空间显著图和时间显著图进行自适应融合;提出基于Gestalt优化的最终时空显著图计算方法。实验结果表明,提出算法能有效检测红外视频的时空显著性。

摘要：针对油茶人工采收效率低,劳动力成本大,且油茶果成熟期短、花果同期等问题,设计了可实现连续振动落果和收集的履带式高地隙油茶果振动采收机。采收机采用骑跨式车架沿油茶树种植行行走,利用曲柄摇杆机构驱动多排阵列的指排杆按照一定的运动轨迹对树冠两侧同时击打作业,落果通过收集板汇集后输送到果箱。根据击打轨迹对采收机击打装置的曲柄摇杆机构进行设计,并用ADAMS软件验证指排架运动轨迹。通过ANSYS软件对击打装置机架和采收机车架进行有限元模态分析,获得其前6阶固有频率,确定其不会发生共振。为接收振动掉落的油茶果,设计了高低错落分布的收集板,不仅能接收落果,且能顺利避开树干,实现整机在运动中完成振动落果和收集作业。最后,加工装配振动采收机样机,在击打液压马达转速为360 r/min条件下进行油茶林地整机试验,试验结果表明,油茶果采收率为87.56%,花苞掉落率为25.86%,满足油茶果采收要求。

摘要：针对圆钢管约束钢筋混凝土梁柱角节点难以满足"强节点,弱构件"的问题,提出设置节点区内置钢管的加强方案。采用ABAQUS有限元分析软件进行节点轴压试验的模拟,通过与已有试验结果对比,在验证有限元分析方法合理可靠的基础上,建立108个加强节点模型进行轴压性能研究。分析结果表明:以内置钢管加强的圆钢管约束钢筋混凝土梁柱角节点,其轴压承载力接近钢管约束钢筋混凝土短柱,容易实现"强节点,弱杆件"的设计原则;加强节点的轴压承载力随混凝土强度等级、节点区内置钢管壁厚、梁高的增加而增加,随内置钢管开槽高度的增加而减小。根据分析结果提出适用于钢管径厚比不小于50的加强节点轴压承载力计算式,并另建立6个计算模型进行适用性检验,结果表明该计算式与检验模型计算结果吻合较好。