It's one that comes up often in terms of estimating modal parameters from test data.

这是个很好的问题，是一个从试验数据中估计模态参数常常会遇见的问题。

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This paper presents a synthesized model updating method using the modal parameters and frequency response functions(FRF) extracted from the vibration test data.

文章提出了一种利用模态参数和由振动试验数据求得的频响函数来进行模型修正的方法。

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ARMAX model method and subspace-based state space method were used to process the flight flutter test data, and identify the flutter modal parameters of aircraft.

论文使用了现代参数辨识技术的AR MAX模型递推法和状态子空间辨识法，对飞行颤振试验数据进行处理，辨识飞机的颤振模态参数。

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