Research On Modeling And Simulation Analysis For Vibration Reduction Of Floating Raft System

Floating Raft system as a modern ship equipment commonly used as a means of vibration and noise reduction has been widely used in both military and civil ships. With the development of radar technology and comfort requirements on how to enhance the floating raft system damping performance studies it has also become increasingly important.This article first setting up the floating raft system's dynamics model by admittance matrix parameters of four-terminal subsystem comprehensive method and obtain graph of power flow transmission. To verify the theoretical modeling conclusions and make optimization analysis easier, this paper attempts to draw floating raft raft solid modeling by Creo software and import into ANSYS divided into regular hexahedral mesh. Modal analysis shows that vibration reduction effects in low frequency is not well. Low-order vibration modes show that the energy consumption mainly through the isolator elastic deformation, so in order to enhance the floating raft damping effect in the low frequency, we need to study the raft rigidity and vibration parameters. The response data of analysis nodes achieved by harmonic response analysis, and plotting the transfer curve of the power flow, compared with theoretical results, shows that ANSYS can effectively simulate the floating raft isolation system. Verify conclusion that the poor vibration reduction effects of floating raft system, at the same time there has been densely-frequency characteristics of floating raft system 100-1000 Hz band.The impact of the floating isolator structure and parameters on the vibration reduction effects of floating raft system shows that change the structure reduces the raft stiffness. It can effectively improve the low frequency vibration reduction effects floating raft and within tight frequency characteristics 100-100 Hz. Change the stiffness of the isolator can change the power flow passing position of peaks occur, the peak and quantity. Especially the lower isolator stiffness increases in favor of floating raft isolation system to enhance the performance of floating raft system.To solve the poor vibration damping effect in low frequencies, this paper attempts to install the dynamic vibration absorber in raft shelves to analyze its influence on frequencybetween 1-100 Hz. Passive vibration absorption device can absorb certain vibration frequency of the vibration energy, but its vibration absorption band is narrow. Self-tuning vibration has a wider vibration absorption band and better vibration reduction effects. Different vibration mounting position for the vibration absorbing effect under multi-frequency excitation also been studied. The results demonstrated that mounting positions under different frequency of external excitation should change for better vibration absorption effect.