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复合材料结构在外部撞击载荷作用下容易产生目不可检的损伤,进而导致结构承载能力降低。以复合材料加筋圆筒结构为对象,研究基于系统辨识模型的外部低速撞击识别实验的两个关键问题。首先,通过数据分析阐明和完善了系统辨识方法中传递函数的模型阶次选择原则;其次,针对压电传感器生产工艺和安装工艺难以保证各传感器均一性问题,提出了一种传感器信号修正方法,以提高载荷识别精度;最后,分析和讨论了加筋结构型式对撞击识别的影响。实验结果表明,本文所提方法能有效地提高识别和重构外部撞击载荷。
The composite structure is easy to produce unacceptable damage under the external impact load, which leads to the decrease of the bearing capacity of the structure. Taking the composite material stiffened cylinder structure as the object, two key problems of external low speed impact recognition experiment based on system identification model are studied. First of all, the principle of model order selection of transfer function in system identification method is clarified and perfected by data analysis. Secondly, aiming at the problem that the production process and the installation process of piezoelectric sensor are difficult to guarantee the homogeneity of each sensor, a sensor signal correction method is proposed. To improve the load identification accuracy; Finally, the impact of the reinforced structure type on impact recognition is analyzed and discussed. Experimental results show that the proposed method can effectively improve the identification and reconstruction of external impact loads.