采用l1范數(shù)改進(jìn)的結(jié)構(gòu)損傷定位向量方法
[Abstract]:In recent years, the damage identification based on structural vibration has been developed rapidly, among which the damage identification method based on the change of flexibility matrix before and after damage is considered as one of the methods with great development prospects. The damage location vector (DLVs) method is a damage identification method based on the flexibility matrix. By calculating a set of specific vectors and applying the vector as a load on the lossless structure, the stress at the damage element is zero or small. The damage location vector is the null space vector of the flexibility matrix difference before and after damage. The damage location vector method does not depend on the structure type and is suitable for multiple damage cases, so it has a great advantage over other methods. Of course, this method is only suitable for structures with linear systems before and after damage. In this paper, the damage location vector method is studied based on the sparsity of the damage location vector. Firstly, we analyze the characteristics of damage location vector from the sparsity of damage location vector, and use the newly developed p (p2) norm to measure the sparsity of damage location vector. It is found that the dense damage location vector is superior to the sparse damage location vector for the damage location vector. Based on this, we propose a new damage location vector selection method. Comparing the new method with the original method, it is found that the new method is superior to the original method in locating the damage, and the new method can reduce the damage misjudgment in the noise environment. In this paper, we propose a sparse recovery algorithm to solve the damage location vector with sparse characteristics, instead of using singular value decomposition (SVD) to obtain it. Based on the properties expected by DLVs, a truss model is numerically simulated and a frame model is tested by using a non-sparse damage location vector. The effectiveness of the proposed improved method and its performance are verified. Because the new selection method of damage location vector avoids the trouble of applying each damage location vector to the structure to determine the selection criteria, the method is more convenient and practical in application.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TU317
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