Large-tonnage dynamic load loading method and device for helicopter strength test

The invention belongs to the technical field of aviation ground tests, and discloses a large-tonnage dynamic load loading method and device for a helicopter strength test, and the method comprises the steps: applying an axial pre-tightening force through a pre-compression spring, and continuously adjusting a supporting part of the pre-compression spring through contact type electromagnetic excitation based on an inertial resonance principle. And the other end of the pre-compression spring generates a dynamically amplified load, and the load is used as a load of a fatigue test for loading. Aiming at the loading requirement of the large-tonnage dynamic load in the helicopter structural strength fatigue test, the inertia resonance device and the control device are added on the basis of an electromagnetic valve loading mode, the electromagnetic valve loading force is subjected to fixed-frequency amplification based on the inertia resonance amplification principle, the large-tonnage dynamic load can be efficiently