基于多变量阶跃响应的风洞系统辨识  

Identification of Wind Tunnel System Using Multivariable Step Responses

作　　者：张廷丰[1] 毛志忠[1] 袁平[1] 张弼[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2016年第11期1521-1525,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(61333006)

摘　　要：2.4 m×2.4 m风洞为多变量耦合系统,根据运行数据无法直接获得单个操纵变量对输出的影响.因此,提出采用多变量阶跃响应方法辨识风洞系统两输入-两输出耦合参数模型,采用三次样条插值法对阶跃响应数据进行滤波处理,再计算出单个通道的阶跃响应数据,在此基础上使用面积法获得各个通道的传递函数模型,并通过对不同阶次模型输出的均方根误差的比较,实现最佳模型阶次的选择.仿真及风洞现场测试结果验证了本文方法的有效性.Because the 2. 4 m×2. 4 m wind tunnel is a multivariable-coupling system, the impact of a single control variable on the outputs cannot be obtain directly from the operating data. For this reason, the multivariable-coupling parametric model of the wind tunnel and filtering processing of the data with step response was proposed by the cubic spline interpolation method. The area method was applied to the parameter identification from the step response data of each channel, and the best model of each channel was determined by the root mean square error of different model orders. Wind tunnel experiments show the effectiveness of the proposed method. © 2016, Editorial Department of Journal of Northeastern University. All right reserved.

关 键 词：风洞 辨识 阶跃响应 面积法 耦合参数模型 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]