Design Of Tank Engine Vibration Isolator Based On Magnetorheological Elastomer

With the development of the technology,tank vehicles develop to high-speed,high-efficiency and light-weight,so that their man-machine environment is becoming more and more complicated and deteriorating.The vibration,noise and operating environment are becoming increasingly prominent.The vibration of the tank has become an important direction.Static and dynamic characteristics of the engine mounting system is one important factor in affecting the mobility of the tank vehicles and the soldier’s comfort.Based on the tank engine as the research background,The design of the tank engine shock absorber based on magnetorheological elastomer(MRE)is discussed from four aspects:theoretical analysis,structural and magnetic circuit design,material preparation,test verification.Specific work is as follows:(1)The dynamic model of the engine mount system is established.The main factors that affect the displacement of the vehicle body(the vertical force of the engine and the road surface excitation)are analyzed,the stiffness range of the single shock absorber is 1 ×10~6 to 1.17×10~7 N/m。(2)According to the design principles of vibration isolator,the structure and magnetic circuit of the isolator are designed.When the current reaches 2A,the minimum magnetic induction intensity of the magnetorheological elastomer is 694 mT,which is evenly distributed to meet the design requirements.(3)The samples of the silicone rubber and natural rubber based MREs are prepared,their properties are tested and compared with the Dynamic thermomechanical analyzer(DMA),The results showed that although the magnetorheological effect of the natural rubber based MRE is smaller than that of the silicone rubber-based MRE,the elastic modulus of the MRE is greater and the applicability of the magnetorheological elastomer is greater in practical applications.So the natural rubber based MRE can meet the requirement of variable stiffness of tank engine mount system,finally natural rubber is determined to make the vibration isolator.(4)The experimental platform based on magnetorheological elastomer isolator was built.In the sweep test,the stiffness of the isolator is increased from 2.7 × 10~6N/m at 0A to 3.2×10~6N/m at 1.5A at the loading mass of 30kg,and the relative magnetorheological effect is 19.3%.the stiffness of the shock absorber is increased from 3.6 ×10~6N/m at OAto 4.1 X 10~6N/m,and the relative magnetorheological effect is 19.3%at the loading mass of 75kg.The experimental results show that the relative magnetorheological effect of the elastomer decreases with the increase of the loading mass.The self-made magnetorheological elastomer has a high magnetorheological effect and the suspension system has the effect of frequency shift.In the damping effect test,by controlling the switch with external current,the suspension system has a better vibration damping effect in the conditions of low frequency,natural frequency and high frequency.