Study on the chaos anti-control technology in nonlinear vibration isolation system

The nonlinear vibration isolation system (NVIS) works in a chaotic state when its parameters are in chaotic range. Under single-frequency harmonic excitation, the system exhibits chaotic behavior with broad band frequency. This idea can be used to control the line spectra water-born noise of the underwater vehicle, and to improve its capability of concealment. In order to ensure that the system works in the chaotic state effectively, a new chaos anti-control method is presented in this paper. Firstly, the NVIS model with feedback is provided, and the periodic-doubling bifurcation characteristic is analyzed. Simulation results show that the system has multiple dynamical behaviors with different parameters. Finally, an experiment on the basis of self-design rig is carried out, and the acceleration signal is measured. Combined with the chaos identification technology, it proves that the system works in a chaotic state at some special parameter range.