Method and device for identifying damping characteristics of dual-frequency harmonic attenuation signals

Abstract

The embodiment of the invention discloses a double-frequency harmonic wave attenuation signal damping feature identification method and device. The method comprises the steps that: envelopes of original double-frequency harmonic wave impact attenuation signals are obtained, conditions of two harmonic component decrements with time change are derived based on principles of a sum value and a difference value of two harmonic component index decrements corresponding to curves formed by peak points and peak-valley points, a least square method is employed to calculate the damping feature coefficient of each harmonic component in the double-frequency harmonic wave impact attenuation signals, and therefore, the problems are solved that a current impact attenuation signal damping feature extraction technology only processes single-frequency signals and is not good in processing effect of envelope curves of the dual-frequency harmonic signals generated after TMD (Tuned Mass Damper) is arrangedso as to cause difficult identification of the damping feature coefficients of the double-frequency harmonic wave impact attenuation signals.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method and device for identifying damping features of a dual-frequency harmonic attenuation signal. Background technique [0002] Under the action of external excitations such as gusts, the vibration response signal of the transmission tower usually includes many frequency components, corresponding to different order modal frequencies, among which the first order frequency is the main cause of the structural dynamic response. The dynamic response of the transmission tower improves the safety of the transmission tower. At present, most of the transmission towers will install a dynamic vibration absorber (Tuned Mass Damper, TMD) to reduce the first-order frequency vibration signal. After the dynamic vibration absorber TMD is installed, the original low-order modal frequency point of the transmission tower disappears, but two corresponding new frequency points appear on both sides...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a dual-frequency harmonic attenuation signal damping feature identification method, which is used to solve the problem that the existing shock attenuation signal damping feature extraction technology can only process single-frequency signals, and the dual-frequency harmonic signals generated after the installation of TMD The processing effect of the envelope curve is not ideal, which leads to the technical problem that the identification of the damping characteristic coefficient of the double-frequency harmonic shock attenuation signal is difficult

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