TMS320C54X芯片在电力系统二次回路测量中的实现

基于TMS320C54X的电力系统二次回路测量系统具有体积小、稳定性高等优点，电力领域应用广泛。本系统采用数字采样测量法测量交流电气参量并以数字滤波和DSP技术为核心保证了系统的测量精度。该系统为用户在线测试二次负荷提供了极大的方便。     

单片机数字滤波算法研究

本文以51系列单片机为背景，针对电子系统中经常出现的随机干扰，介绍了几种使用较为普遍的克服随机干扰信号的单片机数字滤波算法，并给出了相应的算法程序。同时对这几种算法进行了比较，并指出了每一种算法的具体适用范围和注意事项。     

红外AOTF调谐关系及其衍射光波长特性研究

对红外AOTF的分光原理和两级衍射光波长特性进行了理论与实验分析.结果表明:AOTF的驱动频率与衍射光波数基本成线性关系;入射角小于57.6°时,两级衍射光波长不等,波长差随驱动频率的增加而减小.分析了影响AOTF分辨率的主要因素,提出了改进方法.     

天钢集团中板厂SVC动态无功补偿和谐波滤波系统

天津钢铁集团中板厂的负载为冲击性交-交变频机,交-交变频机的谐波除了特征谐波外,还有大量旁频。电网中谐波电流大,功率因数低,电压波动超标。SVC系统为FC TCR系统,通过测试负载电流和普通直流机负载电流,分析频率特性,得出交交变频机的谐波滤波可以按照直流机的滤波装置来设计,同时TCR本身产生的谐波必须予以考虑。     

GSX600型闪蒸干燥机在干燥高粘度膨润土中的应用

根据GSX600型闪蒸干燥机干燥膨润土的运行情况,介绍了GSX600型闪蒸干燥机的操作方法及操作时应注意的一些问题,根据膨润土高粘度的特性和设备的具体情况对系统做了一些调整和改进,对干燥产品的粒度和水分进行了测试。     

GPS／FOG组合导航系统自适应滤波器设计

结合GPS姿态测量系统导航的特点和光纤陀螺敏感角速度范围宽、启动速度快的特点，提出了一种光纤陀螺辅助GPS导航的方法，采用自适应滤波技术设计了组合导航算法，并进行了大量的试验，试验结果表明，利用光纤陀螺辅助GPS导航方法可行．     

Iterative ultrasonic signal and image deconvolution for estimation of the complex medium response

The ill‐conditioned inverse problem of estimating ultrasonic medium responses by deconvolution of RF signals is investigated. The primary difference between the proposed method and others is that the medium response function is assumed to be complex‐valued rather than restricted to being real‐valued. Derived from the complex medium model, complex Wiener filtering is presented, and a Hilbert transform related limitation to inverse filtering type methods is discussed. We introduce a nonparametric iterative algorithm, the least squares method with point count regularization (LSPC). The algorithm is successfully applied to simulated and experimental data and demonstrates the capability of recovering both the real and imaginary parts of the medium response. The simulation results indicate that the LSPC method can outperform Wiener filters and improve the resolution of the ultrasound system by factors as high as 3.7. Experimental results using a single element transducer and a conventional medical ultrasound system with a linear array transducer show that despite the errors in pulse estimation and the noise in the RF signals, excellent results can be obtained, demonstrating the stability and robustness of the algorithm. © 2006 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 15, 266–277, 2005     

On the convergence of stationary sequences in topology optimization

We consider structural topology optimization problems including unilateral constraints arising from non‐penetration conditions in contact mechanics. The resulting non‐convex non‐smooth problems are instances of mathematical programs with equilibrium constraints (MPEC), or bi‐level programs. Applying nested (implicit programming) algorithms to this class of problems is problematic owing to the singularity of the feasible set. We propose a perturbation strategy combining the relaxation of the equilibrium constraint with the restriction of the design domain to its regular part only. This strategy allows us to attack the problem numerically using standard non‐linear programming algorithms. We rigorously study the optimality conditions for the original singular problem as well as the convergence of stationary points and globally optimal solutions to approximating problems towards respective stationary points and globally optimal solutions to the original problem. A limited numerical benchmarking of the algorithm is performed. Copyright © 2005 John Wiley & Sons, Ltd.     

磁通门传感器在车辆导航系统中的应用研究

针对现行车辆导航系统中测角传感器的一些不足和磁通门传感器的特点,将磁通门传感器用于车辆导航系统当中,测量车体的航向和姿态角.并针对在使用过程中存在的问题,提出了基于正交函数的最小二乘拟合法消除车体磁场对传感器测角精度的影响和卡尔曼滤波方法补偿测角过程中的观测误差,有效地提高了磁通门传感器的测角精度.最后,通过实验,验证了2种方法的可行性,测角的最大误差仅为0.74°,达到了令人满意的导航定位效果.     

基于多帧平均和小波分析的X射线影像图像去噪处理

分析了低强度X射线影像系统图像噪声来源及特点，以此提出了处理该图像噪声的“多帧平均滤波 小波变换滤波”的复合算法。通过对峰值信噪比的计算表明，该方法明显优于任何单一算法，取得较好效果。