摘要：Mathematical models are disappointing due to uneven distribution of the air gap magnetic field and significant un- modeled dynamics in magnetic bearing systems. The effectiveness of control deteriorates based on an inaccurate mathematical model, creating slow response speed and high jitter. To solve these problems, a model-free adaptive control （MFAC） scheme is proposed for a three-degree-of-freedom hybrid magnetic bearing （3-DoF HMB） control system. The scheme for 3-DoF HMB depends only on the control current and the objective balanced position, and it does not involve any model information. The design process of a parameter estimation algorithm is model-free, based directly on pseudo-partial-derivative （PPD） derived online from the input and output data information. The rotor start-of-suspension position of the HMB is regulated by auxiliary bearings with different inner diameters, and two kinds of operation situations （linear and nonlinear areas） are present to analyze the validity of MFAC in detail. Both simulations and experiments demonstrate that the proposed MFAC scheme handles the 3-DoF HMB control system with start-of-suspension response speed, smaller steady state error, and higher stability.

摘要：针对同时性图像标注和地理位置预测,基于超图排序和组稀疏最优化提出一种方法。根据超图概念构建起包含不同类型对象的超图G(V,E,w),构建包含排序向量f和查询向量y的一般推荐系统问题;通过执行组稀疏最优化,把超图顶点分割成S个非重叠对象组,对每个对象组分配不同的权值,使它能够充分利用各种类型的信息,提高图像标注和地理位置预测的准确性。基于从中国旅评网抽取出的数据集的实验结果表明,提出方法相比其它方法,能够获得更高的召回-精确率和F1测量值,能够对排名前3位的地理位置获得更高的正确预测率和累计评分。

摘要：针对丘陵山地地形复杂的问题,我们注意到可搭载属具的移动式平台效率低下且自动化程度不高,于是自主设计了一款纯电小型山地农用履带底盘作为移动平台,并基于此设计了一种稳定可靠的控制系统。该系统主要包括整机控制系统,行走驱动系统和48 V电源管理系统。试验结果表明,设计的控制系统能够快速、准确和稳定地控制履带底盘在规定路线行走,履带底盘最大负载爬坡角35°,最大行驶速度4 km/h,最大续航时间6 h。

摘要：High transparency and toughness are prerequisites for sustainable polymers if they are to find wide application as alternatives to petroleum-based ***,the utility of sustainable polymers such as commercially available polylactide(PLA)is limited by their inherent brittleness and high ***,toughening PLA-based materials via cost-effective blending strategies without sacrificing transparency remains a ***,we report a novel strategy involving active refractive index matching for creation of highly transparent and tough PLA ***,we engineered the refractive index of a promising renewable poly(epichlorohydrin-co-ethylene oxide)elastomer by introducing polar ionic moieties via a simple chemical method,and we blended the resulting ionomers with *** best blend showed an impact strength of>80 kJ/m2,an elongation at break of 400%,and high transparency(90%).These characteristics are of great importance for potential applications such as *** strategy offers a versatile new way to prepare high-performance sustainable polymer materials with excellent transparency.

摘要：A predominance area diagram for the Zr-Si-C-O system at 1773 K was plotted according to correlative thermodynamic data. β-SiC/ZrO2 composites were prepared based on the phase diagram by carbothermal reduction of zircon （ZrSiO4） in argon atmosphere. Zircon and carbon black were mixed according to the C/ZrSiO4 mass ratio of 0.2, and with 0, 1wt% and 2wt% extra addition of La2O3. Phase evolution of the mixture was investigated at 1723-1803 K by X-ray powder diffraction, and the microstructure of the product prepared at 1803 K for 4 h was examined by scanning electronic microscope. The results show that the decomposition of ZrSiO4 and the formation of β-SIC can be promoted by increasing the heating temperature and adding La2O3. The β-SiC/ZrO2 composites can be prepared at 1803 K for 4 h in a mixture of zircon, carbon black and La2O3, and the contents of β-SIC and m-ZrO2 in the product sample with 2wt% La2O3 reach the highest values of 10.8wt% and 89.2wt%, respectively. The crystal size of the products is about 200 nm.

摘要：这个问题赶出为线性变化时间的不明确的周期的描述符系统的稳定被重游。为线性变化时间的不明确的周期的描述符系统基于柔韧的稳定性的概念，为柔韧的稳定性的一个必要、足够的条件被提出。柔韧的稳定问题也被学习，相应必要、足够的条件用双系统的符号被给。获得的矩阵不平等条件能被转变到与一些免费矩阵的介绍的线性矩阵不平等一，它使分析和设计过程简单、可靠。

摘要：近年来,随着电商经济的不断发展,越来越多的贵重物品通过网络平台进行销售。然而,在物流运输过程中,贵重物品丢失或替换的事件频发,这不仅给消费者造成了重大的财产损失,还严重损害了物流企业的公信力。针对此问题,设计了一种面向贵重物品的智慧物流箱,该物流箱基于物联网技术,并采用OpenCPU的应用方式,可有效监测物流箱的位置、姿态、开闭状态等信息,确保在整个物流运输过程中维持锁定状态,防止贵重物品的丢失或替换。此外,利用对称加密技术设计了智能锁的安全通信方案,并引入自动封箱和应急开箱方案。续航性能分析表明,该方案有效地提高了智慧物流箱的续航时间,安全性分析表明,该方案能够确保数据的机密性,并有效抵御数据重放攻击。与相关方案对比,该方案不仅考虑到了通信安全和操作安全问题,且硬件设计更加简洁,更符合贵重物品的运输要求。

摘要：完成了红外制冷机驱动系统滤波器的设计与仿真。针对系统关键器件的特性,采用合理算法建立精确的联合仿真模型。并借助联合仿真模型提取分析了系统的干扰机理。基于阻抗失配理论分析了不同滤波器拓扑的插入损耗与源和负载阻抗间的关系。最终提出了一套基于干扰机理的传导干扰滤波器设计及优化方法,该方法有效地优化了滤波器的性能,并降低了设计冗余。通过实验验证了该方法的准确性与可行性。

摘要：以磁悬浮开关磁阻电动机为对象,研究了其转子径向两自由度悬浮力系统的解耦和控制。根据电磁场理论的虚位移定理,建立了磁悬浮开关磁阻电动机径向悬浮力的数学模型。针对该模型具有非线性、多变量和强耦合的特点,采用非线性控制的微分几何方法来设计出解耦规律,通过该解耦规律的补偿,将原系统解耦和完全线性化。对解耦得到的线性子系统,应用滑模变结构控制理论来设计控制器,以获得转子的高精度稳定悬浮。仿真结果验证了该控制策略的有效性。

摘要：针对磁悬浮开关磁阻电机参数设计问题,提出一种基于最小二乘支持向量机与粒子群优化算法的电机结构参数优化设计方法。采用三维有限元仿真建立样本空间,构建悬浮力、电磁转矩与绕组间互感的最小二乘支持向量机非参数模型;并基于该非参数模型,选择满足额定电磁转矩为约束条件,悬浮力最大且绕组间互感最小为优化目标,采用粒子群优化算法获取电机的最优结构参数。仿真结果表明:最小二乘支持向量机非参数模型精确度高,采用该优化设计方法设计的磁悬浮开关磁阻电机具有悬浮承载力强、耦合小、易于控制的优点,并且该优化设计方法算法简单、操作方便。