华南理工大学学报(自然科学版) ›› 2018, Vol. 46 ›› Issue (8): 52-56,63.doi: 10.3969/j.issn.1000-565X.2018.08.008

• 电子、通信与自动控制 • 上一篇    下一篇

结合系数重用正交匹配追踪的字典学习算法

刘杰平,杨朝煜,陈栋,杨业长,马丽红   

  1. 1. 广州五山华南理工大学电子与信息学院
    2. 华南理工大学
    3. 华南理工大学电子与信息学院
  • 收稿日期:2017-12-15 修回日期:2018-04-08 出版日期:2018-08-25 发布日期:2018-07-01
  • 通信作者: 刘杰平(1961-),女,副教授,硕士生导师,主要从事图像/视频信号处理研究. E-mail:eeliujp@scut.edu.cn
  • 作者简介:刘杰平(1961-),女,副教授,硕士生导师,主要从事图像/视频信号处理研究.
  • 基金资助:
    国家自然科学基金资助项目(61471173, 61701181);广东省自然科学基金资助项目(2017A030325430);广州市科 技计划项目(201707010070) 

Modeling Approach Based on Rate-Dependent Hysteresis for Piezoelectric Actuating Mechanism with Load
 

 FENG Ying1 FENG Junjie1 Subhash Rakheja2 JIANG Hui   

  1. 1. School of Automation Science and Engineering∥Key Laboratory of Autonomous Systems and Networked Control,South China University of Technology,Guangzhou 510640,Guangdong,China;
    2. Faculty of Engineering and Computer Science,Concordia University,Montreal H3G 1M8,Quebec,Canada;
    3. School of Electronic Engineering and Automation,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China)
     
  • Received:2017-12-15 Revised:2018-04-08 Online:2018-08-25 Published:2018-07-01
  • Contact: Jie-Ping LIU, 刘杰平(1961-),女,副教授,硕士生导师,主要从事图像/视频信号处理研究. E-mail:eeliujp@scut.edu.cn
  • About author:刘杰平(1961-),女,副教授,硕士生导师,主要从事图像/视频信号处理研究.
  • Supported by:
    National Natural Science Foundation of China;National Natural Science Foundation of China;the Science and Technology Foundation of Guangdong

摘要: 针对压缩感知中字典对信号稀疏表示能力不足的问题,文中提出了一种结合系 数重用正交匹配追踪的自适应字典学习算法,该算法使用系数重用正交匹配追踪算法得 到稀疏系数,在字典更新阶段引入上一次迭代过程的先验信息. 首先对稀疏系数矩阵进行 奇异值分解,再分别用前一次更新的字典对左奇异矩阵和用训练信号对右奇异矩阵进行变 换,然后采用变换后的左、右奇异矩阵构造新矩阵,最后利用新矩阵进行字典训练. 实验结果 表明,采用文中算法得到的字典对图像具有更好的稀疏表示能力,提高了重构图像的质量. 

关键词: 压缩感知, 稀疏表示, 自适应字典, 字典学习 

Abstract:

 As a class of smart material-based actuators,piezoelectric actuators have been widely applied in the micro-nano actuating equipment. However,the nonlinearities existing in the smart materials become the main
obstacle for the improvement of actuating precision. Considering the electromechanical characteristics of the piezoelectric actuator,a modeling method is proposed to characterize the input-output relationship of the
piezoelectric actuating system with an external mechanical load in a wide working frequency range. The proposed
model is based on the rate-dependent PrandtlIshlinskii (RDPI) hysteresis model and shows an effective way to work around the limitation of RDPI hysteresis model,representing the effects analytically caused by the mechanical load with an increase in actuating frequency. With the mechanical load 2. 94N,the experiments for the piezoelectric actuating system are conducted in the frequency range 1 ~80 Hz. Good agreement is found between the mea
sured and predicted input-output curves to show the effectiveness of the proposed modeling method. 

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