椭圆数字滤波器在动态风洞试验中的应用

摘要

An advanced data processing method is demanded, because there are more noises in the raw data of dynamic wind tunnel test, compared with the static wind tunnel test. The characteristics of dynamic wind tunnel test data and the difference of various digital filters are analyzed, and the elliptic filter is the selection. The numerical computing method of elliptic functions and the design process of the elliptic digital filter are discussed in this paper. An instance is demonstrated which is designed for a research project, and the result was satisfying.%由于动态风洞试验比常规静态试验有更多的噪声和干扰,传统的数据处理方法不能满足要求,因此综合考虑动态风洞试验数据的特点,比较不同类型数字滤波器的性能,选择运用椭圆数字滤波器,对动态风洞试验数据进行处理.给出了设计椭圆数字滤波器时所需要的近似求解雅可比椭圆函数的方法,并简单介绍了椭圆数字滤波器的设计过程,给出了必要的设计公式.根据某项目动态风洞试验的试验数据设计了一款低通椭圆数字滤波器,有效地减少了信号中的噪声和干扰,并已成功地用于项目中.