Research on H2/H∞ control of active suspension for heavy special vehicles based on genetic algorithm
The traditional passive suspension has poor adaptability to different road conditions,resulting in a significant decline in vehicle performance under adverse road conditions,and is unable to meet the smoothness and stability requirements of heavy special vehicles under different road conditions.To address this problem,a 9-degree-of-freedom active suspension model of the whole vehicle is established,the H2/H∞ robust control active suspension is designed,and the genetic algorithm is used to optimize the H2 performance metrics under satisfaction of H ∞ constraint,the full-state optimal control law is obtained,and the performance of active and passive suspensions under continuous random pavement and bumpy road is analyzed in both the time and frequency domains.The results show that the designed H2/H∞ control active suspension has good performance in both time and frequency domains under the continuous random pavement,which can improve the smoothness and stability of the vehicle's driving and maneuvering.On the bumpy road,the active suspension could attenuate the vibrations from uneven road surfaces more quickly and reduce the maximum dynamic load on the left front tyre by 23.5％,the wheel ground adhesion is improved.The designed H2/H∞ control active suspension has good adaptability to different road conditions,meeting the needs of improving the smoothness and handling stability of heavy-duty special vehicles under different road conditions.
active suspensionheavy special vehicleH2/H∞ controlgenetic algorithmsmoothnesshanding stability
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