特大型法兰用复杂截面工件精确弯曲成形的工艺

提出了一种复杂截面大型法兰成形的新工艺，即精密弯曲组焊——最后现场精加工的方法，通过小型模拟件的实验研究，分析了弯曲成形过程中工件的变形规律，并采用此工艺制造了某工程上大直径法兰，实践表明采用此工艺成形大型法兰是完全可行的。     

Dynamic response of large increased pressure wind tunnel rotor-gear coupling system with parallel misalignment

To study the misalignment of gear coupling, this paper analyzed the distortion of the tooth of gear coupling on the base of gear coupling ＇ s motion under parallel misalignment, and derived the specific expression of additive radial force, which produced by the rotor＇ torque. The motion differential equations of the large in- creased pressure wind tunnel rotor-gear coupling system were derived by the finite element method. Newmark integral method was applied to calculate the dynamic response of the system with parallel misalignment. The nu- merical results show that： under the effect of additive radial force, the static misalignment can arouse 2X frequency component lateral vibration; the dynamic misalignment can arouse2X,4X,6X multiple frequency components lateral vibration. The 2X frequency component is obvious. The additive radial force of the gear coupling can arouse lateral vibration with even multiple frequency components.