论文部分内容阅读
考虑到１６结点相对自由度壳元能很好地描述薄壳和厚壳的性质，而且和三维实体单元的联接也相当方便，本文采用该种单元对水轮机叶片进行离散，并通过样条插值获得叶片有限元网格结点的三维坐标。对水轮机转轮叶片系统的动力特性进行了具体的分析计算，得到了各阶固有频率及相应模态。结果表明，水轮机转轮最低若干阶频率的振动是以下环为主的振动，同时指出，对不同阶次的频率，附加质量的影响是不同的。
Considering that the relative degree of freedom of 16-node shell element can describe the properties of thin shell and thick shell well, and it is also very convenient to connect with the three-dimensional solid element. In this paper, the unit is used to discretize the turbine blades and the spline interpolation Obtain the 3D coordinates of the blade finite element mesh node. The dynamic characteristics of turbine blade system are analyzed and calculated. The natural frequency and corresponding mode of each step are obtained. The results show that the vibration of the turbine with the lowest frequency of some orders is the ring-based vibration. It is also pointed out that the influence of the additional mass on the different orders of frequencies is different.