Research On Porous Magnetorheological Elastomers And Buffer Device For Cushioning Application

Shock and vibration are very destructive mechanical damage,which brings great loss of life and property.At present,the impact of cushioning materials and device research has been widely used in industrial production,in several major earthquakes,a large number of rubber pads isolated buildings and bridges and other structures have successfully withstood the test;Ships,vehicles and various construction machinery operation of the rubber or sponge pad also successfully withstood the huge impact.However,due to the performance of the traditional buffer device is established,the buffer capacity is limited.Under the action of the instantaneous maximum pulse,a great deal of internal force and deformation will be produced,which brings negative impact to the mechanical structure of the anti impact performance and design.Therefore,it is urgent to use a new type of intelligent impact cushioning material instead of the traditional anti shock material.Based on the development and characterization of porous magnetorheological elastomers,a porous magnetorheological elastomer for cushioning was developed.In addition,in order to characterize the buffer performance and establishes the evaluation system of cushioning performance buffer design test device which based on the porous MRE was designed.The main content of this paper includes:(1)Starting from the porous MRE production group,to develop high performance porous MRE to buffer the application field,and study on the foaming agent and the effects of preparation methods on the properties of porous MRE dynamic mechanics,so as to further optimize the preparation process.(2)Improving the interfacial structure between the matrix and ferromagnetic particles in magnetorheological materials.Because of the porous elastic body to add foaming foaming agent in the preparation process,but also through high temperature process,which makes the porous elastic body and ordinary elastic body compared to some mechanical properties decreased,so the corresponding research method is improved and the matrix structure of the porous ferromagnetic particles interface of magnetorheological elastomers,in order to achieve the corresponding mechanical properties of the reinforcing effect.(3)Build a porous MRE buffer test platform,select the appropriate MRE working mode,the design of buffer device,finite element simulation analysis of the magnetic structure,magnetic circuit design and system optimization technology,and design a reasonable flow porous magnetic testing platform elastic buffer test.(4)Based on the experimental platform,the free fall impact test and the half sine impulse response test were carried out.In the case of different magnetic induction strength,the performance of the anti shock buffer is tested,and the data processing and evaluation system is established according to the test results.(5)Based on the magneto-rheological elastomer buffer device,the semi-active control simulation is carried out.The buffer test and test system is built,and the transmission characteristic test is carried out.The control experiment is carried out by the on-off control strategy.Starting from the control effect of acceleration response,the cushioning performance of the load is analyzed and compared under full opening,full clearance and on-of control.