The Acoustic Performance Influence Research Of Vector Hydrophone Suspension System Base On Subsurface Buoy

With the difficulty of underwater passive detection increasing, it’s inevitable that theworking frequency of passive sonar system trends to very low frequency. Subsurface buoy isfacing the same problem as an underwater sound system. The influence of suspension devicebetween vector hydrophone and platform can’t be ignored which is caused by the changing offrequency. It’s important to choose reasonable suspension device that vector hydrophone canwork normally at very low frequency, and it’s necessary to study the acoustic performanceinfluence of suspension system.Vector hydrophone should move freely at the effect of sound wave in an ideal condition.The ideal condition is gone when suspension device exists. Considering a general model, themotion equations are listed based on the principle of dynamic. After that, the motionequations of several typical suspension systems are simplified. The simplified results showthat the natural frequency of system is determined by the parameters of suspension elements,and the suspension elements should be symmetric.The platform always gets the motivation because of the ocean environment. So one jobof the suspension device is making sure the vector hydrophone gets less energy from themotivation. So the damping capacity of several typical suspension systems is studied. It turnsout that the damping capacity of two elements vertical suspension system is the best, but itcan’t control the rotation of vector hydrophone. Then the rotation control of suspensionsystem is analyzed quantitatively. At last the equation of the acoustic performance influenceof suspension system by motivation is derived. The simulation analysis shows that the lowerlimit of working frequency is lower when the natural frequency of system is lower. Thedensity of vector hydrophone is better the same of water.Mooring device is a necessary part of subsurface buoy. Its vibration will pass to vectorhydrophone. Here, the vibration of mooring cable is simplified to the longitudinal vibrationproblem of pole. The concludes which are tested by both of simulation and experimentinclude that the vibration status of mooring cable is determined by the parameters of mooringcable, especially young modulus. The higher young modulus is, the better for vectorhydrophone working at very low frequency.