Load identification has long been a difficult issue for distributed load acting on structures. In this paper, the dynamic load identification technology based on the modal coordinate transformation theory is developed for dealing with identification problem of the two-dimensional thin plate structure. For the distributed dynamic load acting on a plate, we decompose it with the mode functions in the modal coordinate space and establish the liner relationship between the time function coefficients of the distributed load and the modal excitations which are solved out based on the known response data of the measuring points. Then the distributed dynamic load is rebuilt based on orthogonal decomposition and inverse Fourier Transform method. The simulation examples and elastic thin plate structure tests show that the proposed method has a good accuracy with the allowable error range and is reliable and practical. The proposed method can be also used for load identification of complicated structures in a wide range of engineering applications.

中文翻译：

---

一种基于模态坐标变换的薄板结构分布动载荷辨识方法

长期以来，载荷识别一直是作用在结构上的分布载荷的难题。本文针对二维薄板结构的识别问题，开发了基于模态坐标变换理论的动载荷识别技术。对于作用在板件上的分布动载荷，我们在模态坐标空间中将其分解为模态函数，并建立分布载荷的时间函数系数与模态激励之间的线性关系，并根据已知响应数据求解。的测量点。然后基于正交分解和傅里叶逆变换方法重建分布式动态负载。仿真算例和弹性薄板结构试验表明，该方法在允许误差范围内具有良好的精度，可靠实用。该方法还可用于广泛工程应用中复杂结构的载荷识别。