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针对大展弦比柔性机翼尺寸大、轻质、低频、柔性等特点,为了避免传统模态测试的缺陷,提出采用车载运动条件下的环境激励方式进行机翼结构动力学特性试验研究,并初步建立了大展弦比柔性机翼的结构动力学特性测试技术。试验测试过程中,分别采用加速度计和光纤光栅(FBG)应变传感器测量经过优化的测点的结构响应,并利用特征系统实现算法(ERA)和随机子空间(SSI)法分析结构响应数据。结果表明两种方法的辨识结果均与有限元(FEM)计算结果相接近,加速度的辨识结果和FBG应变传感器测量的结果相一致。这验证了大展弦比柔性结构动力学特性车载试验方案的可行性,同时验证了FBG应变传感器应用于此类测试的有效性。
In order to avoid the shortcomings of the traditional modal testing, this paper proposes an environment-inspired method under the condition of vehicle motion to study the experimental study of the dynamic characteristics of the wing structure, in view of the large size, light weight, low frequency and flexibility of the large aspect ratio flexible wing. The structure dynamic characteristics testing technology of large aspect ratio flexible wing was preliminarily established. During the test, the structural responses of the optimized measuring points were measured with accelerometers and fiber grating (FBG) strain sensors, and the structural response data were analyzed using the ERA and SSI methods. The results show that the identification results of both methods are close to those of the finite element (FEM), and the recognition results of acceleration agree with those of FBG strain sensor. This verifies the feasibility of an in-vehicle test scheme with large aspect ratio flexural dynamics and verifies the effectiveness of FBG strain sensors for such tests.