基于正弦振动试验的航天器结构模态参数识别

The Spacecraft Modal Parameter Identification Based on the Sine-Swept Vibration Test

文章基于正弦数据的特点,主要针对稳态正弦扫描时,扫描频率分布不均匀的情况研究了一种新的数据改进方法,即将所有频率的响应信息叠加在一起,对它重新采样得到新的时域数据。并利用该方法对某型号卫星进行模态参数识别,与模态试验相比,结果比较理想,从而实现了利用正弦振动试验的数据提取模态参数的目的。

A new data-improving method is proposed based on the characteristics of the sine-swept data, considering the uneven swept frequency under the stable sine-swept test. The response of every swept frequency is added up, and the new time data are obtained by performing sampling again. The method is used to identify modal parameters of a satellite. Comparing with the modal test, the results are fairly well, which shows the validity of identifying modal parameters using sine-swept vibration test data.