Helicopter hub center dynamic characteristic test excitation amplitude value adjusting method and device

The invention belongs to the technical field of helicopter hub center dynamic characteristic test loading, and relates to a helicopter hub center dynamic characteristic test excitation amplitude value adjusting method and device. The amplitude command of the frequency sweep voltage signal can be automatically adjusted in real time according to the vibration amplitude of the helicopter buffer in the vibration frequency sweep process, and it is guaranteed that vibration excitation applied to the propeller hub of the helicopter enables the helicopter to have obvious vibration and the landing gear buffer always meets the specified value requirement of the vibration amplitude. The problem that the test is stopped due to the fact that the vibration amplitude of the undercarriage buffer exceeds the limit in the test process is solved, the vibration amplitude of a helicopter body is prevented from being too large, the possibility of damage to a testing machine is reduced, the test loading control automation degree an