Analysis of fatigue life of turbine generator rotor
Analysis of fatigue life of turbine generator rotor
复制标题
汽轮发电机转子疲劳寿命分析
作者：
Wang, Zhengwei;Luo, Yongyao;He, Qingqing;Wu, Jinshui;Chen, Liangnian
本文根据全寿命理论和实测的S-通过实际材料的N曲线，验证了疲劳寿命预测数值方法的可靠性和准确性，分析了可能导致误差的因素，并采用所确定的数值方法对灯泡贯流式机组转子中心部分进行了疲劳分析，计算了额定工况和飞逸工况下的运行情况，并与试验结果进行了比较。对常用的平均应力修正方法进行了验证，在验证的应力范围内，测试点处的最大误差为6.58%，在实际工况下，频繁的启停运行不是造成疲劳损伤的主要原因。
National standard fatigue experiments were conducted and simulated in this paper based on the total life theory and the measured S-N curve of practical material to validate the credibility and accuracy of numerical method for fatigue life prediction.Factors that may lead to errors were analyzed.The warranted numerical methods were used for fatigue analysis of the rotor center part in a bulb unit.Operations under the rated and runaway conditions and the corresponding start-stop processes were simulated.The commonly used mean stress correction was also validated.In the validation experiments,the maximum error at the testing points in the validated stress range was 6.58%.In the practical cases,the major cause of fatigue damage is frequent start-stop running rather than stable operation.