Modal Parameter Identification Methods in the Frequency Domain

In the field of structural vibration analysis, frequency-domain modal parameter identification methods represent a widely adopted technique. These methods process vibration signals through frequency response function analysis to extract critical parameters including natural frequencies, damping ratios, and mode shape coefficients. These parameters are essential for structural health monitoring and damage diagnosis applications. The implementation typically involves Fourier transform operations, peak picking algorithms for frequency identification, and circle-fit or half-power methods for damping estimation. Notably, the method's complete program structure allows straightforward implementation with systematic data processing workflows. Furthermore, this approach can be integrated with complementary analysis techniques, such as time-domain modal parameter identification methods, through data fusion algorithms to achieve more comprehensive and accurate analytical results. The code implementation generally includes signal preprocessing, frequency domain transformation, parameter extraction modules, and result validation components.