基于高频动态特性的点阵结构损伤识别研究
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O329;TB52+3;TH113.1

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国家自然科学基金资助项目(1702118,11672004,11520101001);江苏省基础研究计划资助项目(BK20170520);江苏省高校自然科学研究资助项目(17KJB130005)


Damage Identification of Lattice Structure Based on High Frequency Dynamic Response
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    摘要:

    针对轻质点阵结构中的脱焊损伤,文中采用高频动态响应特性分析方法,通过测量损伤局部处的共振响应,直接对脱焊点进行定位。基于数值方法计算模拟了轻质点阵结构的高频响应,研究了含多个脱焊损伤的点阵结构在高频段内的固有频率和固有振型。结果显示,损伤处将产生明显的局部共振。在实验验证中提出了采用压电片的宽频激励方式,结合扫描式激光测振仪全场测量,计算得到结构在激励频段的频响函数。通过分析频响函数峰值频率对应的固有振型,准确识别出损伤位置。数值与实验研究结果均表明,对轻质点阵结构的高频响应特性进行模态参数识别,可有效识别定位脱焊损伤。

    Abstract:

    A high frequency dynamic response characteristic analysis method is proposed to locate the debonded welding in lattice structures. The location of the defect is detected directly by measuring the local resonance responses. In numerical study, the high?frequency response of light lattice structure and the natural frequencies and mode shapes of lattice structure with multiple damages are analyzed. The results show obviously that there will be local resonance in the damaged areas. In the experimental verification, the broadband excitation method using piezoelectric patches is proposed. Combined with the full field measurement of scanning laser vibrometer, the frequency response function of the structure in the excitation frequency band is calculated. By analyzing the mode shapes corresponding to the peak frequency of frequency response function(FRF), the damage location can be identified accurately. The numerical and experimental results show that the modal parameter identification of the high frequency response characteristics of the lattice structures can effectively identify and locate the debonded welding defects.

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  • 在线发布日期: 2021-10-31
  • 出版日期: 2021-10-30
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