Output-only linear time-varying structure modal parameter identification method
A technology for structural modal and parameter identification, applied in the field of structural dynamics, can solve the problems of complex application, no simplicity, high model order and sample sensitivity, and achieve the effect of wide application prospects and benefits.
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[0109] The three-degree-of-freedom spring-damper-mass system of the present embodiment, such as figure 2 shown. The three-degree-of-freedom spring-damper-mass system of this embodiment includes three masses m 1 、m 2 、m 3 , four dampers c 1 、c 2 、c 3 、c 4 , four springs k 1 (t), k 2 (t), k 3 (t), k 4 (t), where the three masses and the four dampers are constant and do not change with time, while the stiffnesses of the four springs change with time.
[0110] Spring stiffness k in a three-degree-of-freedom time-varying system i The relationship of (t) changes with time is shown in formula (25):
[0111] k i ( t ) = k i , 0 + k i , 1 c o s ( 2 π t p ...
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