电机定子圆柱壳体周向模态频率计算

发布时间：2019-06-07 08:49

【摘要】：为了研究电机定子圆柱壳体长度、壁厚、平均直径以及径厚比对其周向模态频率的影响,用有限元法对不同参数的圆柱壳体进行了模态分析。通过分析得出圆柱壳体周向模态频率与其长度关系很小,而与其壁厚近似成线性比例关系,与其平均直径的平方近似成反比关系。圆柱壳体周向模态频率变化率近似与径厚比成线性变化。圆柱壳体的径厚比越小,模态频率变化率越低;模态阶数越高,模态频率变化率越低。当圆柱壳体径厚比较小时,传统解析公式计算结果误差较大。为了减少计算误差,提出一种计算圆柱壳体周向模态频率的解析方法,通过与有限元仿真和实验模态分析结果对比,验证了该解析计算方法的有效性。
[Abstract]:In order to study the effects of the length, wall thickness, average diameter and diameter-thickness ratio of the stator cylindrical shell on the circumferential modal frequency of the motor, the modal analysis of the cylindrical shell with different parameters is carried out by using the finite element method. Through the analysis, it is concluded that the relationship between the circumferential modal frequency and the length of the cylindrical shell is very small, but it is approximately linear proportional to its wall thickness and inversely proportional to the square of the average diameter. The frequency change rate of circumferential mode of cylindrical shell is approximately linear with the ratio of diameter to thickness. The smaller the diameter-thickness ratio of the cylindrical shell is, the lower the modal frequency change rate is, and the higher the modal order is, the lower the modal frequency change rate is. When the diameter and thickness of cylindrical shell is small, the error of the traditional analytical formula is large. In order to reduce the calculation error, an analytical method for calculating the circumferential modal frequency of cylindrical shells is proposed. The effectiveness of the analytical method is verified by comparing with the results of finite element simulation and experimental modal analysis.
【作者单位】：沈阳工业大学机械工程学院;
【基金】：国家自然科学基金(51175350)
【分类号】：TM303.3

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