Research On The Dynamics Theory Model Of Magnetic Floating Raft Active Isolation System

Vibration control technology is an important branch of vibration engineering field, its main task is making the vibration level of controlled objects to meet people's scheduled standard by some means. Noise and vibration reduction problem of ships caused people's attention long ago. And people have done much research on vibration isolation technology. Vibration isolation can be divided into passive vibration isolation and active vibration isolation. Passive vibration isolation which is adding elastic and damping elements between the source and isolation target, and the elastic and damping elements dissipate vibration energy to achieve the purpose of vibration isolation. Because it does not need external energy, has simple structure, easy to realize, economy and has high reliability, passive vibration isolation has been widely used in various fields in engineering. But passive vibration isolation has inherent defect such as in low frequency vibration isolation effect is undesirability. With the development of science and technology, passive vibration isolation has been difficult to meet people's requirement in many aspects. In order to achieve better vibration isolation effect, people begin to do deep research on active vibration isolation technology.Maglev vibration isolation technology is an active vibration control technology which is developed in recent years, the stiffness and damping of maglev vibration isolation system depends on the structure parameters and equilibrium position of the system and control system, and they also can change in stable range in real-time according to need. The maglev vibration isolator is the main components of maglev vibration isolation system, and its core technology is maglev supporting technology. Maglev supporting technology is a typical kind of high-performance mechatronics technology, and it has no contact, no friction, high precision, low power consumption, and low noise, high clean and so on. The stiffness and damping of maglev vibration isolator can change in real-time according to control parameters; this provides a good technology foundation for improving the vibration isolation performance of raft vibration isolation system. Therefore the maglev active vibration isolation technology will be an important developing direction of active vibration control field.This paper applies maglev supporting technology to the vibration isolation field, designs an active vibration isolation component which is the maglev vibration isolator, and combines the maglev active vibration isolation component and the traditional passive vibration isolation components together to make an active vibration isolation system which is maglev floating raft vibration isolation system. The system uses the controllable and adjustable characteristics of stiffness and damping of maglev active vibration isolator to restrain the vibration in a wide frequency region. This paper does research begin with analyzing the theory of vibration control and vibration isolation, and then analysis the dynamics model of the floating raft vibration isolation system and maglev active vibration isolator, on the basis of this, the dynamics model of maglev floating raft vibration isolation system is deduced by dynamic substructure method. This laid a foundation for studying vibration isolation performance of maglev floating raft vibration isolation system.