Vibration isolation effect modelling method of floating raft vibration isolation system

The invention discloses a vibration isolation effect modelling method of a floating raft vibration isolation system, which comprises the following steps: firstly, determining the transmission coefficient of a raft frame, and measuring the vibration acceleration of each footing of a machine set, the input impedance and transmission impedance of each upper-layer vibration isolator, the input impedance of the raft frame at the mount point of each upper-layer vibration isolator, the input impedance and the transmission impedance of each lower-layer vibration isolator, and the input impedance of abase at the mount point of each lower-layer vibration isolator; and secondly, dividing the floating raft vibration isolation system into two subsystems according to the assumption of an excitation source, wherein in the first subsystem, each footing of the machine set is taken as a displacement source to perform calculation to obtain the vibration acceleration of the mount point of each upper-layer vibration isolator of t