When the spacecraft structural dynamic model is updated using test data, the freedom of FEM can be matched with test freedom by means of reduction method.
利用试验数据修正航天器结构动力模型时，使用缩聚方法使有限元自由度与试验自由度匹配。
When the spacecraft structural dynamic model is updated using test data, the freedom of FEM can be matched with test freedom by means of reduction method.
利用试验数据修正航天器结构动力模型时，使用缩聚方法使有限元自由度与试验自由度匹配。
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