随着铁塔高度的增高,抱杆高度也随之增加,其稳定问题尤为突出。为了深入研究抱杆结构的整体稳定性能,使用特征值屈曲方法在平衡吊重工况下分析抱杆结构临界荷载随各因素变化规律。同时,为考虑初始缺陷、不同加工条件等因素对结构稳定性...随着铁塔高度的增高,抱杆高度也随之增加,其稳定问题尤为突出。为了深入研究抱杆结构的整体稳定性能,使用特征值屈曲方法在平衡吊重工况下分析抱杆结构临界荷载随各因素变化规律。同时,为考虑初始缺陷、不同加工条件等因素对结构稳定性能的影响,提出一种不平衡起吊稳定承载力简化计算方法,给出抱杆结构不平衡起吊整体稳定承载力计算式、步骤和各参数选取方法。该方法效率高,满足工程所需精度。通过对某一工程实例进行有限元分析,得到关键参数,将其代入整体稳定计算式,得到示例抱杆不平衡吊重为16.3 k N。展开更多
The magnetic properties of the claw pole have a direct effect on the output power of a generator Many methods can be used to measure these magnetic properties,each with its own advantages,but an important shortcoming ...The magnetic properties of the claw pole have a direct effect on the output power of a generator Many methods can be used to measure these magnetic properties,each with its own advantages,but an important shortcoming is that all are destructive.In this study,a new non-destructive method to measure the magnetic properties of claw pole was proposed and a corresponding testing set-up was designed.A finite-element model was constructed to simulate the measurement process.Results proved that the measured magnetization-like curves had good agreement with the trend of the input magnetic curves and the effect of the positioning error in the measuring process could be neglected.To further validate the new method,seven types of claw poles of different materials subjected to different heat-treatment processes were forged and tested by both the new method and the conventional ring-sample method.Compared with the latter,the new method showed better consistency,relatively higher accuracy,and much stronger stability of measurement results;however,its sensitivity needs to be improved.The effects of material compositions and heat-treatment parameters on the magnetic properties of the claw pole were briefly analyzed.展开更多
文摘随着铁塔高度的增高,抱杆高度也随之增加,其稳定问题尤为突出。为了深入研究抱杆结构的整体稳定性能,使用特征值屈曲方法在平衡吊重工况下分析抱杆结构临界荷载随各因素变化规律。同时,为考虑初始缺陷、不同加工条件等因素对结构稳定性能的影响,提出一种不平衡起吊稳定承载力简化计算方法,给出抱杆结构不平衡起吊整体稳定承载力计算式、步骤和各参数选取方法。该方法效率高,满足工程所需精度。通过对某一工程实例进行有限元分析,得到关键参数,将其代入整体稳定计算式,得到示例抱杆不平衡吊重为16.3 k N。
基金Partially supported by National Natural Science Foundation of China(Grant No.51875348)
文摘The magnetic properties of the claw pole have a direct effect on the output power of a generator Many methods can be used to measure these magnetic properties,each with its own advantages,but an important shortcoming is that all are destructive.In this study,a new non-destructive method to measure the magnetic properties of claw pole was proposed and a corresponding testing set-up was designed.A finite-element model was constructed to simulate the measurement process.Results proved that the measured magnetization-like curves had good agreement with the trend of the input magnetic curves and the effect of the positioning error in the measuring process could be neglected.To further validate the new method,seven types of claw poles of different materials subjected to different heat-treatment processes were forged and tested by both the new method and the conventional ring-sample method.Compared with the latter,the new method showed better consistency,relatively higher accuracy,and much stronger stability of measurement results;however,its sensitivity needs to be improved.The effects of material compositions and heat-treatment parameters on the magnetic properties of the claw pole were briefly analyzed.
