电动静液压主动悬架自适应Smith反馈时滞控制
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U463.3

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国家自然科学基金资助项目(51775426);陕西省重点研发计划资助项目(2020GY?128);西安市碑林区应用技术研发类资助项目(GX1928)


Adaptive Smith Feedback Time Delay Control of Active Suspension with Electro Hydrostatic Actuator
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    摘要:

    为了提高电动静液压(electro hydrostatic actuator,简称EHA)主动悬架在时变时滞下的减振效果,提出了一种自适应Smith反馈时滞控制策略。首先,建立了含时滞的EHA主动悬架模型,根据时滞微分方程理论得到可控阻尼与临界时滞的关系,分析了临界时滞下时滞对悬架系统动态特性的影响;其次,以遗传算法优化得到的最优时滞反馈系数及时滞量为补偿参考,采用自适应Smith反馈时滞控制对时滞主动力进行补偿;最后,仿真分析了自适应Smith反馈时滞控制策略下悬架的动态特性,开展了EHA主动悬架时滞控制台架试验。结果表明:自适应Smith反馈时滞控制下的悬架动态特性得到改善,有效降低了时滞对EHA主动悬架的影响。

    Abstract:

    In order to improve the damping effect of active suspension with electro hydrostatic actuator (EHA) under time-varying delay, an adaptive Smith feedback time delay control strategy is proposed. Firstly, an EHA active suspension model with time delay is established, the relation between controllable damping and critical delay is obtained by combining the theory of delay differential equation, and the influence of the critical delay on the dynamic characteristics of suspension system is analyzed. Secondly, the optimal feedback coefficient and time lag obtained by genetic algorithm are used as the compensation reference, and the adaptive Smith feedback time delay control is used to compensate the main force of time delay. Finally, the dynamic characteristics of the suspension under the control strategy are simulated, and the time-delay control bench test of the EHA active suspension is carried out. The results show that the dynamic characteristics of the suspension under the adaptive Smith feedback time delay control is reduced, which effectively reduces the influence of the time delay on the EHA active suspension.

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  • 在线发布日期: 2022-11-01
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