%0 Journal Article
%T Modified frequency identification method and its application to helicopter modeling<br>改进的频域辨识方法及其在直升机建模中的应用
%A LIU Peng
%A WU Zhe
%A <br>刘鹏
%A 武哲
%J 控制理论与应用
%D 2011
%I 
%X A frequency identification method for a six-DoF state-space model of helicopter is presented. The overall concept is to extract a complete set of non-parametric input-to-output frequency responses that fully characterizes the coupled helicopter dynamics. This set of frequency responses is the basis for the model simplification, and for conducting a nonlinear search based on K-means clustering algorithm for a six-DoF linear state-space model that matches the frequency-response data set. A new method for combining the results of multi-input frequency-response analyses obtained from a range of spectral windows into a single optimized response is presented. This method significantly improves the dynamic range and the accuracy of the identified frequency-response relative to single-window methods. The accuracy of the identified model is validated by comparing the model-predicted responses with the responses collected during flight experiments.
%K helicopter
%K state-space model
%K K-means clustering algorithm
%K frequency identification
%K composite windows
%K model simplifying<br>直升机
%K 状态空间模型
%K K平均聚类算法
%K 频域辨识
%K 复合窗函数法
%K 模型简化
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=970898A57DFC021F93AB51667BAED7F7&aid=21567333E5794BF54BDC03D6AEFB3EAA&yid=9377ED8094509821&vid=D3E34374A0D77D7F&iid=59906B3B2830C2C5&sid=7C540AD62AEA28A8&eid=52BD3BD127FE3A27&journal_id=1000-8152&journal_name=控制理论与应用&referenced_num=0&reference_num=0