ANALYSIS OF DYNAMIC LOAD-BEARING CHARACTERISTICS AND INFLUENCE FACTORS FOR RUBBER ELASTIC BRACKETS

Based on the theory of the complex stiffness and taking the advantage of the orthogonal experimental method, the dynamic performance tests for rubber elastic brackets of wind turbines are carried out to study the influences of the load frequency, the load amplitude and the preloading on the rubber elastic brackets. Experimental results show that there is a significant correlation between the dynamic performance of rubber materials and the load frequency or the load amplitude. The elastic stiffness and the damping factors of the rubber elastic brackets increase significantly with the increase of the load frequency; the elastic stiffness decreases but the damping factors increase gradually with the increase of the load amplitude. Analysis of variance based on the orthogonal experiment data shows that the load frequency is the most important factor for the dynamic performance, the second important factor is the load amplitude, and the effect of the preloading is very limited.