基于Matlab的风洞信号延迟时间计算方法

摘要

Aiming at the problem that the synchronization between the balance signal and the angle signal is not good when doing test in wind tunnel, a method based on Matlab to calculate the delay time is proposed. The definition of the cross correlation function and three methods to calculate the correlation function have been analyzed, the method how to use the correlation function to calculate the delay time has also been introduced. At last, we use this method to analyze signal synchronization in the test technique of continuous angle of attack traverses. The analysis results show that correlation function method can make qualitative and quantitative analysis of signal synchronism and get determined signal delay time. This method provides an important guarantee for data correct the test data and get the real test data.%针对风洞试验中出现天平信号与迎角信号的同步性差异过大的问题，提出一种利用Matlab的计算信号间延迟时间的方法。分析了互相关函数的定义及3种求解互相关函数的方法，就如何应用互相关函数计算信号间的延迟时间做了简要介绍，并采用连续变迎角测力试验技术中的信号同步性进行了风洞试验分析。试验结果表明：该方法能够有效地对风洞信号的同步性进行定性、定量的分析，获得确定的信号延迟时间，为试验数据的修正和真实试验数据的获取提供了重要保证。