运用正弦扫频实现电动振动台模型的频域辨识

目的研究以电动振动台为典型设备的相关振动试验装置的频域辨识技术。方法通过分析电动振动台数学模型,采用正弦扫频试验方法,进行全频带振动台空台面正弦扫频,并对所获得的时域正弦扫频数据进行频谱分析,进而获得系统的频率数据,再运用复数域上的最小二乘拟合算法,完成振动台模型传递函数的辨识。结果通过某型电动台空台面试验,对一组实测数据进行辨识,辨识出的电动振动台模拟与真实模拟一致。结论通过该方法并合理选取模型结构,能够很好地辨识出振动试验装置的模型。

Application of the Sine-sweep Test in Model Frequency Identification for a Electrodynamic Shaker

Objective To study the frequency domain identification technology for vibration test equipment, using the electric dynamic shaker as a typical device. Methods Firstly, the mathematics model of the electrodynamic shaker was analyzed, secondly, the sine-sweep test was used for whole-frequency sine sweep of the empty vibration table, and the sine-sweep signal data acquired was subjected to frequency spectrum analysis. So the frequency data of the electrodynamic shaker system was acquired. Finally, the least squares complex-curve fitting algorithm was used to accomplish the identification of the transfer function for the vibration table model. Results Through test with an empty electrodynamic shaker, a group of measured data was identified, and the electrodynamic shaker simulation mode identified was consistent with the real simulation. Conclusion Using this method, in combination with matching the structure of the shaker model, the model of the vibration test equipment could be well identified.