Dynamic stiffness testing device and testing method of vibration damping fastener for track

The invention relates to the technical field of rail traffic, in particular to a dynamic stiffness testing device of a vibration damping fastener for a rail, which comprises a static force spring loading system, a fixed supporting system and a vibration system, the vibration system is connected with an excitation system and an acquisition system, and the vibration system comprises stacked mass blocks. The test fastener is arranged between the upper-layer mass block and the lower-layer mass block, the static force spring loading system comprises a loading assembly and a static force sensing assembly located between the loading assembly and the upper-layer mass block, and the loading assembly can move downwards to apply loading force to the test fastener. The invention further provides a dynamic stiffness testing method of the vibration reduction fastener for the track. The dynamic stiffness testing method comprises the steps that high-frequency dynamic stiffness testing is conducted on the tested fastener thro