Research On The Method Of The Semi-Active Switch Control Of Double-Layer Isolation System

As a kind of effective vibration damping device,floating raft vibration isolation is widely used in vibration isolation of submarine power units.The double-layer isolation system is the most basic form of a floating raft isolation system.It is a vibration isolation system that realizes vibration reduction step by step through a double-layer structure.Semi-active control is a kind of parameter control,which can improve the performance of the isolation system by constantly changing the structure parameters to adapt to external excitation.Combining the semi-active control with the double-layer isolation can effectively improve the isolation effect of the double-layer isolation system.This article studies the semi-active switch control of double-layer isolation system.Main tasks are as follows:(1)Establish the mechanical model of flexible foundation double-layer isolation system,derive their physical parameter expressions from the definition of force transmissibility,insertion loss,vibration level difference,transfer power flow rate,insert power flow rate and vibration response of foundation.Then discuss the influence of foundation stiffness value on the force transmission rate,insertion loss,vibration level drop,transfer power flow rate,insert power flow rate and vibration response of foundation with the change law of the excitation frequency based on the double-layer isolation system as an example.(2)Build the dynamic model of semi-active control double-layer isolation system.According to the characteristics of switch control in semi-active control double-layer isolation system,research the existing principle and limitations of semi-active control switch algorithm and propose a new switch semi-active control algorithm.(3)Construct MATLAB-Simulink simulation model of double-layer isolation system,carry out the simulation of passive control with high and low damping and semi-active control of each switch algorithm.The results indicate that the isolation effect near the low frequency and resonant frequency of the double-layer isolation system under the new switch algorithm is significantly improved compared to passive control and existing semi-active switch control algorithms.(4)Set up the test system of switch semi-active control double-layer isolation,execute program for switch algorithm to realize the semi-active control of the double-layer isolation system.Carry out tests of new switch algorithm for semi-active control of double-layer isolation system and passive control with high damping and low damping.The test results are basically consistent with the simulation results,which indicate that the new switch algorithm can effectively improve the isolation performance near the low frequency and resonant frequency of the double-layer isolation system under the new switch algorithm.