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| Research on control characteristics of vehicle suspension system with intentional time delay |
| Received:June 26, 2019 Revised:October 24, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20190626001 |
| KeyWord:vehicle suspension vibration intentional time delay inherent time delay active control |
| Author | Institution |
| 闫盖 |
上海第二工业大学 工学部, 上海 |
| 方明霞 |
同济大学 航空航天与力学学院, 上海 |
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| Abstract: |
| A vehicle suspension system with time delay is taken as the research object.The active control characteristics of the system with intentional time delay are studied by combining theory with experiment.Firstly,the dynamics equation is established,and the stability characteristics of the system are analyzed.The theoretical and simulation results show that under the classical second order optimal control law,the system is stable when the time lag is in the stable interval;otherwise the system becomes unstable with divergence.Therefore,the time-delayed active control law is designed based on state transformation.The simulation results show that the law can guarantee the stability of the system.It is also found that the change of the time lag will make the vibration amplitude of the system greatly change.Therefore,the intentional time delay is introduced in the control system,and the influence of the intentional time delay on the vibration characteristics of the system is studied.The calculation shows that the reasonable active time delay can reduce the vibration amplitude of the system.In order to verify the correctness of the results,a time delay active control suspension experimental system is set up.And it is verified through the simulation results compared with the experimental results under the same working conditions.The results show that adding reasonable intentional time delay in control can produce a better damping effect.Experimental results and simulation results have good agreement.Therefore,the research shows that it has high credibility.Due to the randomness of road excitation,finally,the suspension time-delayed optimal active control are analyzed under random excitation,the results show that when the active delay time is 0.04 s,the acceleration of the sprung mass RMS value is 39.4% lower than that without active time delay.It indicates that time-delayed active control has important engineering application value and plays a significant role in promoting the theoretical research of vehicle active suspension system with time delay. |
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