自动功率因数调整器中的计数式模糊控制方法

本文提出了自动功率因数调整器中的计数式模糊控制方法，描述了控制对象的特点和控制准则，并且定义了一般计数式模糊控制器概念，从而为计算机控制系统设计得出了一种新的方法。     

岩体和混凝土长期峰值强度短期试验方法的研究

本文采用自行设计的短期试验方法，对13根钢筋混凝土梁进行了长期峰值强度破坏试验，探讨了构件的极限强度与长期峰值强度之间的机理关系。     

多自由度位移机构的设计

介绍了一套用于辅助计量测试的多自由度位移机构设计实例,讨论了各自由度的特点及不同实施方案.     

机织织物剪切行为研究

 研究了平纹碳纤维机织织物的剪切行为。研究发现,织物的分阶段剪切行为与织物的细观结构有关,不同的剪切阶段具有不同的剪切机理,通过XLT-3400连续变体式显微镜和像框实验结果对不同剪切阶段的剪切机理进行了分析。通过纱线抽出实验获得了织物中纱线之间的摩擦系数,将纱线当作一个悬臂梁安装,通过此方法获得了纱线的抗弯刚度,由这两个实验导出了摩擦力矩。利用像框剪切实验以及力矩平衡,建立了平纹织物初始剪切阶段载荷 剪切角的关系模型。实验结果表明,此模型可以很好地模拟剪切角度超过0.05 rad之后的织物初始剪切行为。     

Tensile properties of a composite–metal single-lap hybrid bonded/bolted joint

Hybrid bonded/bolted (HBB) joint has been widely used in engineering practice because it can overcome the potential weakness of pure bonded and pure bolted joints. However, studies on HBB joint are still at the initial stage. In this paper, tensile properties of a composite–metal single-lap HBB joint was investigated experimentally. And a detailed finite element model (FEM) was established to simulate the tensile behavior of the joint. The model was verified by the experimental results. Then the damage propagation and load transfer mechanism were explored based on the FEM. The results show that the HBB joint can provide multi-load transmission paths and resist damage propagation in the adhesive. The HBB joint has higher strength and energy absorption capacity than the pure bonded joint. And the HBB joint has greater initial damage load and tensile stiffness than pure bolted joint. Adhesive fillets can obviously improve the tensile performances of the HBB joint. Lateral stiffness of the joint boundary and testing machine show obvious effects on tensile performances of single-lap hybrid joints.     

碳纤维陶瓷基复合材料的磨削加工研究进展

综述了磨削参数、纤维方向、不同加工方式以及其他因素对磨削力和表面质量的影响规律;总结了不同加工方式下的碳纤维陶瓷基复合材料的磨削机理;展望了碳纤维陶瓷基复合材料磨削加工的研究方向。     

复合固体推进剂用中性聚合物键合剂的研究进展

综述了近年来中性聚合物键合剂的研究进展,归纳了中性聚合物键合剂在合成、应用方面的研究成果,提炼出中性聚合物键合剂的发展动向,在此基础上对其今后的发展给出自己的建议。     

永磁双凸极电机中常见故障的机理研究

永磁双凸极电机运行时,可能会出现以下常见故障:三相绕组线或/和三相霍尔连接线的错误接线;霍尔信号自身的故障,即恒为高电平或低电平,其电平不随转子位置变化而变化。出现这些故障后,电机的电动运行将受何影响,以及如何迅速判断并排故成为重要的实际问题。文中针对12/8极转子斜槽式永磁双凸极电机,列举了电机常见的故障模式,继而分别对霍尔信号线及三相线接线故障、霍尔信号本身故障进行了详细的机理分析,得出结论,给出每一种故障出现后电机的工作情况,并通过故障模拟及工程实践验证了文中分析结论的正确性及实用性。     

嵌入式高可信架构中基于静态模型的调度研究

为解决嵌入式高可信软件架构中的实时调度问题,分析了现有采用分区机制的安全系统中分区调度的不足,提出了一种基于固定周期分区的静态调度模型,并采用优先级位图算法建立了两级调度机制。为了保障分区中任务的实时性和正确性,对分区中任务采用静态优先级和最早时限优先调度(EDF)动态优先级两种调度策略,分别就其任务调度条件和可调度性进行了理论研究,针对复杂的动态优先级任务提出了一种可调度条件,并通过仿真实验进一步验证了此调度条件的正确性。     

Study on Friction Torque Loading with an Electro-hydraulic Load Simulator

This article, in order to precisely impose friction on aircraft and weapon actuation systems, presents a new friction loading method characteristic of “torque-zero velocity” switching control with an electro-hydraulic load simulator. As the general Stribeck friction model has little related to static friction, it proposes a “torque-zero velocity” switcher, in which a zero-velocity controller is developed to load the static friction and a torque controller the kinetic friction. With the help of mathematical modeling, this article designs a “torque-zero velocity” switching controller and, correspondingly, provides a “dual-threshold judgment” algorithm. Simulation results indicate that the proposed method can be successfully used to carry out the static and kinetic friction simulation with an electro-hydraulic load simulator.