基于FRFT和LBP的笑脸识别

利用FRFT的时频双重特性和LBP算子能提取纹理图像微小特征的优点,提出一种将分数阶Fourier变换(FRFT)与局域二值模式(LBP)算子相结合的笑脸识别算法.对训练样本进行分数阶Fourier变换,取其变换的幅值信息作为脸部表情特征,与LBP融合进行分类判别,同时采用总体识别率和笑脸识别率统计结果,在RML表情数据库进行仿真验证.实验结果表明,该方法在笑脸识别中相比其他方法的识别性能更好.     

Fractional order and BICO disturbance observers for a run-of-mine ore milling circuit

Grinding mill circuits are hard to control due to poor plant models, large external disturbances, uncertainties from internal couplings, and process variables that are difficult to measure. This paper proposes a novel fractional order disturbance observer (FO-DOB) for a run-of-mine (ROM) ore milling circuit. A fractional order low pass filter (Q-filer) is used in the DOB to offer an additional degree of freedom in tuning for set-point tracking performance and disturbance rejection performance. Another disturbance observer is introduced in which a Bode ideal cut-off (BICO) filter is used for the Q-filter. A full non-linear plant model is used for evaluation of the performance gained over the ubiquitous PI controller. The simulation results show that the FO-DOB and BICO-DOB schemes are useful additional tools for ROM ore milling circuit control implementations.     

英维思MES在塑胶企业中的应用

塑胶原料生产是一个典型的批次生产过程,其MES系统的功能需求不同于离散工业和流程工业,有其行业的特殊性。本文借助英维思MES软件平台,通过对订单的跟踪管理和配方逻辑模型的再造,成功地实现了塑胶原料生产企业ERP（企业资源管理）与PCS（生产控制系统）的信息集成,为流程行业MES系统的实践提供了新的补充,取得了很好的效果。     

焦化分馏塔的防腐蚀设计

就扬子石化公司延迟焦化装置炼制高含硫、高酸值原油时的焦化分馏塔内防腐蚀问题进行了探讨。     

Higher-order fractional constitutive equations of viscoelastic materials involving three different parameters and their relaxation and creep functions

Two higher-order fractional viscoelastic material models consisting of the fractional Voigt model (FVM) and the fractional Maxwell model (FMM) are considered. Their higher-order fractional constitutive equations are derived due to the models’ constructions. We call them the higher-order fractional constitutive equations because they contain three different fractional parameters and the maximum order of equations is more than one. The relaxation and creep functions of the higher-order fractional constitutive equations are obtained by Laplace transform method. As particular cases, the analytical solutions of standard (integer-order) quadratic constitutive equations are contained. The generalized Mittag–Leffler function and H-Fox function play an important role in the solutions of the higher-order fractional constitutive equations. Finally, experimental data of human cranial bone are used to fit with the models given by this paper. The fitting plots show that the models given in the paper are efficient in describing the property of viscoelastic materials.     

飞行仿真系统中舵机特性建模与模型降阶

针对某型电液伺服舵机特性，首先建立了线性数学模型，在此基础上推导出了传递函数。其次针对该传递函数阶数较高，难以在仿真系统中实现的问题，通过基于Gram矩阵的均衡模型降阶法，运用matlab工具箱对该传递函数进行降阶处理，得到了降阶最小实现模型。然后对原始高阶函数和降阶后函数分别进行了仿真试验，比较测试结果发现，两者仿真曲线基本一致，符合要求。最后将最小实现模型加入飞行仿真系统进行测试，结论表明该系统性能良好，完全能够替代真实舵机进行飞行控制系统仿真试验。     

M周期分数傅里叶变换的光栅信号去噪方法

用矩阵方法离散地实现了任意M周期的分数傅里叶变换(FRFT),它可实现变换级次及周期的自由选择。根据相应的噪声频谱,选取适当的级次及周期,可使FRFT构造一个极窄的带阻滤波器,将其中心频率对准相应噪声的窄谱,便可滤除与理想信号频谱重叠部分的噪声分量,同时保持信号分量。在实验中,用矩阵方法实现的FRFT对所测光栅信号进行了去噪处理,并与传统的傅里叶与小波分析去噪方法进行了对比,结果表明,只要选取适当的级次和周期(α=0.545,Μ=5)就可获得理想的去噪效果。     

基于Petri网技术的交通信号相位调节研究

提出了一种将Petri网技术应用干交通信号控制系统之中的策略。应用Petri网对典型的交叉路口进行建模分析，通过设定相位次序来提高交通效率。该模型能够有效地描述交通过程中的动态行为，利于分析和验证，并且易于实现。     

分数槽在正弦波交流永磁伺服电动机中的应用

介绍分数槽绕组在正弦波交流永磁伺服电动机中的应用及实例.     

利用位序法求标准拉丁方算法

文章根据排列与组合可计数的特点,给出了利用位序法求标准拉丁方的算法。在实现此算法时,构造了一套字符化的大整数运算系统,解决了随拉丁方阶数增大位序值剧增在计算机上无法表示或处理的问题。通过在分布式并行计算环境MPIBD中的实验,给出了所有4阶与5阶标准拉丁方。