Stay cable frequency comprehensive self-verification analysis method based on dynamic test

Abstract

The invention discloses an inhaul cable frequency comprehensive self-verification analysis method based on a dynamic test. The inhaul cable frequency comprehensive self-verification analysis method comprises the steps that inhaul cable vibration response time history data are acquired; a Fourier transform method module, an empirical mode decomposition module and a variational mode decomposition module are respectively used for processing inhaul cable dynamic response time history data; according to the three module methods in the above steps, cable frequency values are decomposed respectively, whether the vibration order corresponding to the frequency value can be determined or not is judged according to each group of output frequency results, if yes, a first-order vibration frequency result is output, first-order vibration frequencies obtained by the three modules are compared, and whether the three groups of data meet convergence conditions or not is judged; otherwise, outputting the minimum frequency result obtained by the three module analysis methods, comparing whether the results of the three modules meet the frequency order relation, judging whether the vibration order corresponding to each frequency can be determined, if not, determining that the effective frequency cannot be extracted from the group of measurement data, and otherwise, outputting the power analysis result.

Description

technical field [0001] The present invention relates to the technical field of in-service detection and evaluation of prestressed cable structures, and more specifically relates to a prestressed cable frequency that performs multi-algorithm comprehensive analysis combined with algorithms and multi-order frequencies for dual self-verification of the cable's measured dynamic data. Analytical method. Background technique [0002] The cable force of prestressed cables is directly related to the bearing capacity, deformation and dynamic performance of the structure, and is an important evaluation index of the service state of the structure. For prestressed cables in service, if there is no pre-embedded sensor, the indirect method is often used to detect the force of the cable. Generally, the dynamic sensor is used to test the acceleration and other vibration time history signals of the cable, and the frequency of the cable is obtained according to the time-frequency analysis. Th...

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Problems solved by technology

However, this technology has high requirements on the test reflective surface, and the signal loss on the long-distance low-reflection surface is large, and the main natural vibration frequency of civil engineering structures is generally low (within 10Hz), and the environmental noise interference is large. Under the long-distance test condition, the data The signal-to-noise ratio is low, and how to ensure the accuracy of testing and analysis has rarely been studied, which has become an important bottleneck problem restricting the application and development of non-contact detection technology in the field of civil engineering

On the other hand, there is no effective and convenient verification method in engineering whether the data obtained by using a single test sensor is consistent with the actual situation of the cable

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