Analysis of Random Vibration Fatigue Life Based on Fluctuation Wind for Antenna Structure

Abstract

Aimed at fatigue damage in the antenna structure caused by large amplitude vibration with long time fluctuating wind loads, this paper use the harmonic synthesis method to transform power spectrum of Davenport fluctuating wind to fluctuating wind speed time series based on time domain. Then comprehensively considering the surface roughness coefficient, wind pressure coefficient of variation with height, wind vibration coefficient in Beijing area ,it transforms the fluctuating wind speed into the fluctuating wind pressure curve, takes the structural dynamics simulation and is obtained the dynamic response of the antenna structure in turbulent wind Loads; By the method of rain-flow counting , the fatigue life is analyzed with the statistics for the dangerous location of the antenna structure coursed of fatigue stress with time.