摘要：The load transfer analytical method is applied to study the bearing mechanism of piles with vertical load in this paper. According to the different hardening rules of soil or rock around the pile shaft, such as work-softening, ideal elasto-plastic and work-hardening, a universal tri-linear load transfer model is suggested for the development of side and tip resistance by various types of soil (rock) with the consideration of sediment at the bottom of the pile. Based on the model, a formula is derived for the relationship between the settlement and load on the pile top to determine the vertical bearing capacity, taking into account such factors as the characteristics of the stratum, the side resistance along the shaft, and tip resistance under the pile tip. A close agreement of the calculated results with the measured data from a field test pile lends confidence to the future application of the present approach in engineering practice.

摘要：Focused on the dynamics problems of a lunar lander during landing process, the whole process was analysed in detail, and the linear elastic model of the moon soil was established by means of experiments-analogic method. Combining the way of elastic impact with the way of velocity replacement, the dynamics model of damping free vibration dynamics model with 3-degree of freedom(DOF) for lunar lander is obtained according to the vibration mechanics elementary theory. Based on Lagrange equations and the energy principle, the damping free vibration differential equations for the lunar lander with 3-DOF are derived and the equations are solved in simulation ways by means of ADAMS software. The conclusions obtained can be used for the design and manufacture of lunar lander.

摘要：Deficiencies of applying the simple genetic algorithm to generate concepts were specified. Based on analyzing conceptual design and the morphological matrix of an excavator, the hybrid optimization model of generating its concepts was proposed, viz. an improved adaptive genetic algorithm was applied to explore the excavator concepts in the searching space of conceptual design, and a neural network was used to evaluate the fitness of the population. The optimization of generating concepts was finished through the ＂evolution - evaluation＂ iteration. The results show that by using the hybrid optimization model, not only the fitness evaluation and constraint conditions are well processed, but also the search precision and convergence speed of the optimization process are greatly improved. An example is presented to demonstrate the advantages of the orooosed method and associated algorithms.

摘要：皮秒级瞬态取样门主要应用于激光聚变实验和高能物理实验中,对单次高速脉冲进行实时取样。提出了一种新颖的基于肖特基二极管桥的平衡取样门,给出其模型和具体电路设计。电路仿真结果表明,对称的选通设计保证了选通脉宽为100 ps时,取样间隔也为100 ps,取样门带宽为4.4 GHz,可应用于多路超短激光脉冲取样。

摘要：国产45 MW速调管是在原国产30 MW HK-1型速调管的基础上改进和发展起来的,其聚焦磁场设计也是参照30 MW速调管聚焦磁场设计并在其基础上加工改造完成。为此必须对旧聚焦系统进行改造,设计出符合需要的磁场分布,以满足45 MW速调管工作的需要。首先从理论上找出速调管工作时的理想磁场值,根据该磁场分布设计出相应的线圈结构;其次根据45 MW速调管的结构尺寸,对30 MW速调管的线圈支架进行改造,利用旧线圈和新支架组成新的聚焦系统;最后,根据理论模拟和测试结果,调整和优化各组线圈的电流值,给出速调管工作时的各组聚焦电源运行参考值。叙述了新聚焦线圈的理论设计和测试分析,包括新线圈支架的设计、水冷系统与线圈的结构安排和整体的测试结果,最后根据速调管高功率测试运行状态给出速调管工作时的聚焦线圈电流的参考值。

摘要：基于神经网络所具有的定性推理和定量数值并行计算能力 ,以及学习记忆能力 ,集成非线性系统的多个特征模型和控制器 ,实现了控制系统的多模态智能控制 .该方法充分结合系统的定性知识和定量数学描述信息 ,实现了参数大范围变化时变系统的良好控制 .最后用该方法对某型激光制导炸弹设计了一多模态控制器 ,仿真结果表明了该方法的优良性能 .

摘要：讨论了一类严格反馈型不确定非线性系统的输出反馈跟踪问题 .所讨论的不确定性不满足线性增长条件 .先设计高增益观察器估计输出偏差的微分 ,并将由此获得的信号的符号用于变结构观察器 ,随后用backstepping过程设计输出反馈控制器 .得到的控制器可以保证闭环系统的所有信号都是有界的 ,且跟踪误差可以任意地小 .

摘要：建立1种本构模型,用于研究形状记忆合金(SMA)结构和复合材料的力学响应。首先,该本构模型在单轴应力状态和多轴应力状态下得到考核;其次,给出了移植到ABAQUS的用户子程序umat的求解格式。利用有限元方法分析了SMA的CT(紧凑拉伸)和TPB(三点弯曲)试样以及SMA—纤维增强复合材料和常规金属合金增强SMA基复合材料的力学响应。在CT和TPB裂纹前端,有不同的相变规律,SMA复合材料的相变取决于应力状态和两相材料的材料性质等。

摘要：给出一种新的感应电动机转子磁链自适应观测器的设计方案 ,以克服电动机参数发生变化时矢量控制系统性能的下降 .这种设计方案不依赖于感应电动机的定转子参数 ,算法的稳定性和收敛性由正实误差传递函数条件下的参数调整算法保证 ,数字仿真结果说明了它的有效性 .

摘要：研究含时变滞后的不确定系统的控制综合问题 .基于Lyapunov方法提出了一种含滞后补偿的鲁棒控制设计方法 .闭环稳定性条件由一组线性矩阵不等式表示 .在这些条件中给出了稳定性和滞后以及其导数之间的关系 .实例显示 ,利用提供的方法所给出的结果比以往文献给出的结果保守性小 .