摘要：精密锻造齿轮在原材料利用和提高生产率方面与机加工齿轮相比有比较明显的优点。精密镊造锥齿轮已应用在汽车齿轮差速器，并拥有很高的可靠性。另一方面，仍继续研究提高精度和扩大应用范围。本文介绍了差速器齿轮的整个精密模锻过程，从模具设计、冷锻到热处理。镀模的应力和弹性变形的确定借助于有限元分析软件。通过应变测量模具的实际弹性变形。本研究中模具的弹性变形达到1mm。模具尺寸的定量分析利用了经模的CAD／CAM数据。

摘要：The lateral stability of Velocity-173, canard-pusher type airplane, has been investigated with and without an extended vertical panel. It is well known that Velocity-173 has an excellent longitudinal stability but a relatively poor lateral stability. To improve the lateral stability, two types of composite sandwich panel have been designed and attached to the vertical tail of Velocity-173. A series of flight test has been performed to measure the effects of the extended vertical tail. Analytical methods, such as maximum likelihood estimation method and real-time parameter estimation method, have been used to extract lateral controllability/stability derivatives from flight test data. This work validates the effects of an extended panel to the lateral stability.