By means of mathematic analysis method, the design calculation problem of bellow expansion joint in two dimensions and three - dimensions pipe system were solved. American Expansion Joint Manufactory Association EJMA adopted the plane geometry method.

• 该文采用数学解析的方法,解决两维和三维管系中波纹管膨胀节的设计计算问题,美国膨胀节制造商协会标准(EJMA)采用的是平面几何法。