燃机端面齿联轴器刚度特性参数化建模与实验

为研究刚度特性对重型燃机端面齿联轴器工作行为的影响,构建端面齿联轴器刚度分析参数化模型,对端面齿接触压力、扭转刚度、压缩变形等重要参数进行计算分析.采用有限元方法研究联轴器结构变形与刚度的变化规律.用实验装置对联轴器的变形和刚度进行了直接测试,刚度模型计算结果与有限元结果以及实验结果吻合较好.研究结果表明:螺栓预紧过程中端面齿及轮盘圆柱发生了不同程度的扭转,导致联轴器各部件刚度特性各有不同,其中端面齿压缩刚度随预紧力增大明显增大,而其它部件的刚度略微减小.由于扭转的存在,端面齿联轴器在变形、刚度变化规律、接触应力及接触状态等特征上有别于一般的联轴器.

Parametric modeling and experimental research of stiffness characteristics of curvic coupling of gas turbine

To study the effects of stiffness characteristics on the working behavior of bolted joint with curvic coupling of heavy duty gas turbine, a stiffness analytical model was established with parametric modeling method. The curvic contact pressure, rotation stiffness, compression deformation have been derived by the proposed method, the deformation and stiffness change of all parts of the curvic coupling are investigated during the bolt tightening by finite element analysis and experimental method. The validity of the method is proved by experiments and finite element simulation. The results show that the bending behavior on the curvic and the cylinder part of the disc in bolt tightening, the curvic compression stiffness increases sharply and the stiffness data of other parts decreases slightly during bolt tightening process. The change laws including deformation, stiffness, contact stress, contact status of contact surfaces in curvic coupling are different from those in usual couplings.