野草入侵模糊算法的半主动空气悬架研究

为了抑制由路面不平引起的车辆振动,结合磁流变阻尼器和空气弹簧的变阻尼/刚度特性,设计了含内置永磁体式磁流变阻尼器的半主动空气悬架系统.基于电磁学原理,对内置永磁体式磁流变阻尼器的力学特性建模.建立了1/4车辆二自由度动力学模型,并利用野草入侵算法对常规模糊算法规则进行优化,开发了野草入侵-模糊混合控制策略对内置永磁体磁流变阻尼器的空气悬架进行半主动控制.为验证该控制策略在磁流变空气悬架的半主动控制效果,进行了C级路面随机输入及凸块脉冲输入仿真分析,仿真结果可知,野草入侵-模糊控制策略能有效地提高半主动悬架系统的综合性能.并且通过台架试验进一步表明,利用该控制策略能够使车身振动加速度及悬架动挠度分别减小25.87%、35.13%.

IWO-Fuzzy-Hybrid Control Strategy of Semi-Active Air Suspensions

A novel magnetorheological damper with embedded permanent magnets( MREPM) was designed and inte-grated into vehicle suspension systems with air spring to restraining the vibration of vehicle induced by uneven pave-ment. Based on the principle of electromagnetism,the magnetic field and mechanics model of MREPM was estab-lished. Then,a 1/4 car model of semi-active suspension system with two degree of freedom was designed in MAT-LAB. A fuzzy controller which is optimized by invasive weed optimization ( IWO ) was built, namely, IWO-fuzzy hybrid control strategy. To validate the proposed control strategy in vehicle suspension,the dynamic simulation of ve-hicle system was carried out under C grade road random excitation and pulse excitation caused by convex block. The simulation result shows that the IWO-fuzzy control strategy can effectively improve the comprehensive performance of the semi-active suspension system. Moreover,through the shake table test,it is shown that the vibration acceleration of vehicle body and the dynamic deflection of suspension reduced by 25.87%,35.13% respectively.