摘要：We proposed a lower extremity exoskeleton for power amplification that perceives intended human motion via humanexoskeleton interaction signals measured by biomedical or mechanical sensors, and estimates human gait trajectories to implement corresponding actions quickly and accurately. In this study, torque sensors mounted on the exoskeleton links are proposed for obtaining physical human-robot interaction（pHRI） torque information directly. A Kalman smoother is adopted for eliminating noise and smoothing the signal data. Simultaneously, the mapping from the pHRI torque to the human gait trajectory is defined. The mapping is derived from the real-time state of the robotic exoskeleton during movement. The walking phase is identified by the threshold approach using ground reaction force. Based on phase identification, the human gait can be estimated by applying the proposed algorithm, and then the gait is regarded as the reference input for the controller. A proportional-integral-derivative control strategy is constructed to drive the robotic exoskeleton to follow the human gait trajectory. Experiments were performed on a human subject who walked on the floor at a natural speed wearing the robotic exoskeleton. Experimental results show the effectiveness of the proposed strategy.

摘要：A design and optimization approach of dynamic and control performance for a two-DOF planar manipulator was *** the kinematic and dynamic analysis,several advantages of the mechanism were illustrated,which made it possible to obtain good dynamic and control performances just through mechanism *** on the idea of design for control(DFC),a novel kind of multi-objective optimization model was *** were three optimization objectives:the index of inertia,the index describing the dynamic coupling effects and the global condition *** indexes to characterize the designing requirements such as the velocity of end-effector,the workspace size,and the first mode natural frequency were regarded as the *** cross-section area and length of the linkages were chosen as the design ***-II algorithm was introduced to solve this complex multi-objective optimization *** criteria from engineering experience were incorporated into the selecting of final parameters among the obtained Pareto solution ***,experiments were performed to validate the linear dynamic structure and control performances of the optimized mechanisms.A new expression for measuring the dynamic coupling degree with clear physical meaning was *** results show that the optimized mechanism has an approximate decoupled dynamics structure,and each active joint can be regarded as a linear SISO *** control performances of the linear and nonlinear controllers were also *** can be concluded that the optimized mechanism can achieve good control performance only using a linear controller.

摘要：简述了中国一航沈阳发动机设计研究所风扇/压气机气动设计系统建设的基本思路.为了积累设计经验、规范设计方法、减轻设计人员劳动强度、提高设计效率和可靠性,在多年风扇/压气机设计及型号研制的基础上,初步完成了可视化、网络化的风扇/压气机现代气动设计系统的建设.该系统已经过初步测试,现已应用于工程设计中.

摘要：为实现骨科手术自动化,研制了用于获取断骨位置和姿态信息的全自动C形臂X光机,但其结构形式决定了它是一种典型的大惯量、高柔性机构,易于产生残余振动。残余振动的存在不利于图像的连续拍摄,且影响拍摄质量。采用输入指令整形技术,针对系统的一、二阶模态,设计输入指令整形器,对系统的输入指令进行整形滤波后,有效地消除了残余振动,提高了系统的响应速度。输入指令整形方法本质上是设计一种滤波器,采用该方法抑制残余振动不需要对原有系统的结构和硬件作任何改动。实验证明,这种方法对于抑制大惯量、高柔性系统中存在的残余振动问题是有效的。

摘要：影响交流输电线路全寿命周期成本LCC(life cycle cost)的有很多成本动因,为设计中找到那些自身波动对LCC波动影响较大的动因以利于在管理中明确对象和落实LCC指标,采用蒙特卡洛仿真模拟了不确定因素对各成本动因的影响,从统计规律上减少相关系数的误差,并以斯皮尔曼(Spearman)相关系数衡量了各成本动因与LCC之间的关系。对500kV以及1000kV交流输电线路分析表明:导线电能损耗成本、经济指标参数以及运行年限对线路LCC的敏感度较高。

摘要：液压变压器在理论上能够无节流损失地控制直线执行机构的运动速度,而且能够回收负负载的能量,为了提高液压变压器的能量利用效率,文中设计了节能系统的总效率模型,以总效率最高为目标,采用优化算法计算出液压蓄能器容积的数值,分析了气体压力在回收能量过程中的变化曲线,完成了对液压蓄能器的参数匹配;建立了节能系统的Simulink模型,采用模糊PID控制策略对负载下降时的运动速度进行控制。仿真结果表明,该控制策略能够很好地实现对负载运动速度的控制。

摘要：对于阀厅全模型数值模拟,电位加载方式不同时,阀厅内部金具上的电场分布是不同的,因此有必要对典型相序时的电位、电场分布进行仿真分析;而目前,国内关于阀厅全场域数值求解的参考文献较少。为此,讨论了交流、直流加载方式下的区别以及静电场瞬时加载法在阀厅数值模拟中的应用。根据辽宁某±500 kV换流站阀厅换流变压器设备参数,通过MATLAB仿真得到阀厅内部主要设备在额定功率以及轻载0.1倍额定功率下的电位波形,选取其中比较典型的8组数据进行加载求解,并得到了相应时序下阀厅内部金具表面电场强度的最大值。计算结果表明,在当前设计方案及电位加载方式下,阀厅内部金具表面最大场强符合直流阀厅内部电场控制要求。该数据为阀厅的设计规划提供了可靠支撑,具有重要指导意义。

摘要：突破传统的零部件设计方法,将基于变密度法的连续体结构拓扑优化方法应用到发动机支架结构设计中,以结构刚度作为约束条件,重量最小化为目标函数,对三种工况载荷下的发动机支架进行了拓扑优化设计,在保证结构强度的前提下,获得优化模型中材料分布的最佳形式,结合工程实践设计出刚度高重量轻的发动机支架合理结构,避免了设计过程中的盲目性和主观性,提高了设计效率。

摘要：基于半导体激光器激发荧光材料的白光激光照明(wLD)技术在超高亮度照明和显示领域具有重要的应用价值。兼具“高光通量”和“可控发光面积”是wLD实现高亮度的前提条件。因此,荧光材料如何在具备高饱和阈值的前提下,有效地限定发光光斑尺寸,成为该领域的一个热点问题。基于荧光材料微结构设计的散射调控技术为解决该问题提供了可能。本文首先对荧光材料中通过散射设计实现可控发光面积的研究进行了总结;其次探讨了散射系数对材料发光特性的影响;然后介绍了相关研究中的两个关键技术:发光光斑尺寸的测量方法和基于数值模拟的光斑尺寸预测方法;最后展望了相关研究的发展趋势。

摘要：目的　探讨PCR结合寡核苷酸阵列杂交快速诊断常见新生儿感染病原细菌方法。方法　通过对 4 0多种常见病原菌的 16SrDNA序列比较分析 ,在中间找到一段两端高度保守中间相对变异的序列。依据其保守序列设计一对通用引物 ,用于扩增细菌 16SrDNA目的基因。同时依据相对变异区域的序列设计常见的 8种病原细菌的探针 ,阵列于带正电的尼龙膜上 ,与通用引物的PCR产物杂交 ,在一个反应体系中 1次可检测出标本中可能存在的常见致病菌。结果　设计的通用引物能有效扩增出常见的细菌目的序列。实验结果表明寡核苷酸阵列均能特异地与其检测细菌的通用引物PCR产物杂交 ,而不与其它所试细菌通用引物PCR产物杂交 ,说明探针具有很强的特异性。进一步采用寡核苷酸阵列对临床分离的菌株进行鉴定 ,以细菌自动鉴定仪做对比 ,结果表明寡核苷酸阵列能检出常见的 8种病原菌。