几种线连接耦合损耗因子的计算

根据直线连接耦合损耗因子的计算理论,推导出了折线连接、弧线连接、任意曲线连接耦合损耗因子的计算公式。通过数值仿真,建立了直线连接、折线连接、弧线连接和任意曲线连接耦合系统模型,并对这4种形式连接的耦合损耗因子进行了数值计算。建立了轿车统计能量分析模型,并对轿车各个相邻子系统进行耦合,算出了轿车各子系统间线连接耦合损耗因子。     

数据采集卡在LabVIEW中的驱动方法

LabVIEW目前已成为虚拟仪器软件的重要代表,但是在LabVIEW中不能直接使用非NI公司的数据采集卡,必须自行编写驱动程序.介绍了在LabVIEW中驱动普通数据采集卡的几种方法,包括直接端口读写法、利用代码接口节点CIN(Code Inteface Node)的方法和利用CLF(Call Library Function)节点调用动态链接库的方法,并比较了三种方法的应用特点.实践证明,LabVIEW软件平台具有很好的开放性,可以实现对普通数据采集卡的编程.     

一组反馈可线性化非线性系统的同时镇定

基于控制Lyapunov函数(CLF)方法,研究了一组具有标准型结构的反馈可线性化系统同时镇定问题.证明了该组系统具有一个共同的二次型CLF,给出了构造CLF的简单算法,并设计了能使该组系统同时全局渐近镇定的连续状态反馈控制律.所得结果推广了近期文献中的有关结论,仿真实例说明了所用方法的有效性.     

选矿技术在处理贵冶贫化电炉渣中的应用

介绍了贵冶贫化电炉铜渣的性质,分析了常规选矿方法处理电炉渣的技术难题,并通过对贵冶先进选矿工艺流程的介绍及生产应用的阐述,证实该技术在处理电炉渣领域的明显优势,以及带来的巨大经济效益和社会环境效益。     

SWP/HCI协议栈测试研究

本文对NFC产品介绍了系统分层概念,并在此基础上从SWP/HCI协议栈一致性测试、外场测试、兼容性测试的角度对NFC产品测试进行了系统介绍。     

基于RGBD数据与深度权重的压缩光场显示

使用多层空间光调制器的压缩光场(compressive light field,CLF) 显示技术具有空间带宽利用率高、图像分辨率好等优势,是一种很有前景的光场显示技术。传统的方法将光场分解视为超定问题并使用优化算法求解。随着重建光场的分辨率、深度、视角等性能参数的提升,优化算法的计算效率低、内存消耗大的缺陷被放大,难以实现快速计算。为此,本文提出了一种新型CLF分解算法,该算法将原始光场分解为物点进行存储,仅占用少量内存;利用深度权重和加权平均代替了优化算法,大幅提高了运算效率。在同等条件下,所提出的算法占用内存仅是传统方法的38.8%,计算时间缩短了93.7%,图像质量提高约1 dB。最后通过仿真和实验两种方式对比了该方法和传统方法的显示效果,验证了算法的有效性。     

Improvement of power system stability by using a VSC-HVdc

The capabilities of a VSC-HVdc to improve the stability in power systems are analyzed in this paper. The analysis considers a power system which has the need for increasing the transmission capacity. Two options are analyzed: connection of a new ac transmission line or connection of a VSC-HVdc link. Different disturbances are applied in the system in order to analyze the dynamic response of the system. Supplementary control is included in the control of the VSC-HVdc. The control strategies in the supplementary control are based on nonlinear and linear theory. Furthermore, remote and local information are used as input signals in the control strategies. Simulation results clearly showed the benefits of VSC-HVdc in the improvement of power system stability.     

Stabilization of a (3,0) mobile robot by means of an event-triggered control

Event-triggered control (ETC) is a sampling strategy that updates the control value only when some events related to the state of the system occurs. It therefore relaxes the periodicity of control updates without deteriorating the closed-loop performance. This paper develops a nonlinear ETC for the stabilization of a (3,0) mobile robot. The construction of an event function and a feedback function is carried out based on the existence of a stabilizing control law and a Control Lyapunov Function (CLF). The event function is dependent on the time derivative of the CLF and the feedback function results from the extension of Sontag's formula, which ensures asymptotic stability, smoothness everywhere and continuity at the equilibrium. Experimental results, compared with a computed torque control, validate the theoretical analysis.     

同时镇定一族带有不确定参数的多输入非线性系统

Simultaneous stabilization for a collection of multi-input nonlinear systems with uncertain parameters is dealt with in this paper. A systematic method for obtaining a control Lyapunov function (CLF) is presented by solving the Lyapunov equation. A sufficient condition that a quadratic CLF is a common CLF for these systems is acquired. A continuous state feedback is designed to simultaneously stabilize these systems. Finally, the effectiveness of the proposed scheme is illustrated by a simulation example.     

有限长圆筒壳与圆板连接的耦合损耗因子研究

研究了有限长圆筒壳与圆板耦合这一常用结构的耦合损耗因子 ,使用格林函数建立了有限长圆筒壳和圆板的耦合损耗因子计算公式 .与传统半无限长圆筒壳计算公式对比 ,所得的计算结果更符合实际情况