Structural damage location and damage assessment method based on frequency variation
A technology of damage degree and frequency change, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, and can solve problems such as difficult measurement of degree of freedom information, incomplete structural modal parameters, and difficulty in obtaining high-order modal information.
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[0078] Such as figure 1 , figure 2 Shown, the present invention adopts following steps:
[0079] The first step: establish the finite element model of the undamaged structure as the reference finite element model;
[0080] Step 2: Vibration test the damaged structure and identify the m-order modal frequency of the damaged structure ω i * ( i = 1 , . . . , m ) ;
[0081] The third step: assess the damage degree of the damaged structure;
[0082] Step 4: Determining the damage location of the damaged structure.
[0083] The specific algorithm of the above steps is deduced as follows:
[0084] 1. The reference finite element model is represented by K and M, that is, the stiffness matrix and mass matrix of the undamaged structure, and its eigenvalues are exp...
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