Abstract:

A new aircraft adopted the all movable stabilizer whose shaft was fixed on the fuselage. The results of the calculations and model tests indicated that the rotation frequency of the all-movable stabilizer is an important parameter for the flutter characteristics of an aircraft. Because the lower rotation frequency was discovered in the first aircraft's ground vibration test, the design requirements were not met. It once became a big problem in the aircraft flight tests.The rotation frequency of all movable stabilizer depends on many factors. The non-linear effects on rotation frequency are briefly described in this paper. The measures adopted to raise the rotation frequency are also presented. Thus, the higher rotation frequency is obtained and the design requirements are met without any weight penalty.

Key words: all-movable stabilizer, rotation frequency, free play, non-linear effect