Study On The Control System For Isolation And Buffer Based On Magneto-Rheological Technology

Deep-space exploration has already became weighs nations high tech industry level and economic strength, and has a very important significance in science, military affairs and politics. As the key technology in deep-space exploration , isolation buffer technique is very important. Magnetorheological elastomer(MRE)is a class of new smart material whose shear modulus may be varied by application of magnetic field resulting in the changes of stiffness. Devices used of MRE have the features of no sealing, stable performance ,quick response and so on. MRE Isolation buffer has low energy consumption, simple configuration, good reliability and wide operation bandwidth compared with traditional isolation buffer, and will be the direction of smart isolation buffer in the future. In this paper, rheology mechanism of the MRE material, MRE isolation buffer design, mechanical property test, dynamic characteristics, control strategy and control system design and implementation are studied. The specific works are as followed:â‘ The magnetic effect of magnetorheological elastomers is analyzed according to ferromagnetic particles and matrix viscoelasticity. A coupling field model ,in which the oblique chain has a certain angle with the magnetic field, is proposed on the basis of dipole and coupling field models. Relationship between the magneto-induced shear modulus and the oblique angle of particles chains is deduced that the magneto-induced effect will decrease while the oblique angle of particles chains increases. Finally, by using the dynamic mechanical analyzer (DMA),the magneto-induced shear storage modulus, loss modulus and loss gene of MRE sample are tested at different magnetic field and frequency and the experimental and the results verify the rationality of viscoelastic model.â‘¡The structural design of MRE isolation buffer is discussed on the basis of MRE working model . The viscoelastic model which characterizes the mechanic properties of MRE is established according to the basic model of viscoelastic materials -Kelvin model. At the same time, the MRE isolation buffer is test on the mechanic properties test platform, and results shows that the shear stiffness increase gradually with increasing current density, and is a function of exciting current.â‘¢A dynamic model of MRE isolation buffer is presented ,and simulation model is established by using Matlab/Simulink. The accuracy and efficiency of the model is certified by the comparison of data measured with simulation and experiment. Two control strategys is put forwarded which are dual control and human-simulated intelligent control(HSIC).After simulating the two control, result shows that dual control is simple and convenient, and HSIC can inhibit more effectively the maximum peak acceleration of sprung mass.â‘£Based on dSPACE AutoBox, real-time control planform is put up, and some key technologies of software and hardware are solved such as AutoBox controller, current driver and some control software.10cm drop experiment that MRE isolation buffer is fixed on slide rail of carbinet is imposed. Experimental results show that the maxmun peak acceleration of sprung mass can be inhibit by two controls , even on the resonance peak, although the real-time control effects is worse than simulating effects.