Assessment of the impact of a damper pendulum on a steel cantilever member of a spatial structure
Keywords:
pendulum oscillations, Fourier transform, seismic monitoring, emission signalAbstract
The paper presents the results of an experimental study on the dynamic characteristics of a steel cantilever element in a spatial structure, using passive seismoacoustic monitoring methods. The purpose of the study was to determine the spectral characteristics of the object and assess the effectiveness of the pendulum vibration damper, as well as to conduct a comparative analysis of the damping properties of the structure under different operating modes. The study's relevance stems from the need to increase the reliability of engineering structures by implementing modern methods for monitoring their technical condition.
Vibrations were recorded using three-dimensional geophones with velosymmetric sensors oriented along three mutually perpendicular axes, which ensured the fixation of the spatial structure of the vibration process. Measurements were carried out under conditions of natural disturbance without the use of artificial influences, which allowed obtaining data close to the real operating conditions of the structure. The monitoring system provided continuous recording, preliminary signal processing and their spectral analysis.
During the study, the natural frequencies and shapes of the structure's vibrations were determined, and its damping characteristics were evaluated in the absence and presence of a pendulum damper. It was found that the use of a damper leads to a decrease in the amplitudes of vibrations and an increase in the level of damping, which confirms its effectiveness. It is shown that spectral characteristics can be considered as an informative indicator of the technical condition of the structure, sensitive to changes in its mechanical properties.
The results obtained confirm the feasibility of using passive seismoacoustic monitoring for the diagnosis of engineering structures. The proposed approach can be used to assess the condition of structures, monitor the effectiveness of vibration damping systems, and detect damage early.
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