橡胶弹性支座动态承载特性及其影响因素分析

基于复刚度理论,采用正交实验法,对风力发电机橡胶弹性支座进行动态性能实验,研究载荷频率、载荷幅值、预载荷诸因素对弹性支座动态性能的影响规律. 实验结果表明,橡胶材料的动态性能与载荷频率和幅值具有显著的相关性. 频率增加,橡胶弹性元件的弹性刚度和阻尼因子明显增大;幅值增加,弹性刚度减小,阻尼因子却逐渐增大. 对实验数据进行方差分析,表明载荷频率对动态性能的影响最大,其次是载荷幅值,预加载因素影响非常有限.

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.