类Chen-Qi四维超混沌系统预定时间自适应同步
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Pre-Defined-Time Adaptive Synchronization of the 4-D Hyper-Chaotic Chen-Qi-Like System
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    摘要:

    本文应用预定时间控制理论,设计了基于正切函数、双曲正切函数、指数函数的三种自适应控制器和参数估计律,以实现类Chen-Qi超混沌的驱动系统与同类型的参数未知的响应系统,在预定时间内达到同步,完成理论证明.应用数值仿真,考察了同步误差曲线、控制输入曲线图等,对比了三种控制器的效果.结果表明:当驱动系统为混沌运动时,设计的控制器能使响应系统在预定时间内同步到混沌运动,四个状态的同步误差收敛时间相差较小.当驱动系统为周期运动时,设计的控制器能使响应系统同步到周期运动,但四个状态的同步误差收敛时间相差较大.其根本原因是三次非线性项带来的不平衡、不匹配.同时也表明:基于正切函数的自适应控制器和参数校正律,相比其余两种控制器和参数自适应律,对状态初值和系统参数有更大的适应范围,普适性更好.

    Abstract:

    Appling pre-defined-time stability theory, three controllers were designed to achieve synchronization between Chen-Qi-like four-dimension hyper-chaotic driving systems and response systems of the same type with unknown parameters within a pre-defined time based on tangent function, hyperbolic tangent function, or exponential function. Theoretical proofs were provided. Its’effectiveness were testified with state time history diagrams and synchronous error curves via numerical simulation. The results indicated that controllers designed can achieve to synchronize to chaotic motion while the driving system in chaotic motion, and with a small convergence time difference among the four state synchronization errors. But there was a significant convergence time difference in the four state synchronization errors while driving system in periodic motion. That was induced by the imbalance and mismatch of the state cubic nonlinear term essentially. The results also indicated that adaptive controller and parameter correction law based on tangent function had a larger range of adaptability to initial state values and system parameters comparing to the other two controllers and parameter adaptive laws, thus it hold a better universality.

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王院生.类Chen-Qi四维超混沌系统预定时间自适应同步[J].动力学与控制学报,2025,23(2):83~92; Wang Yuansheng. Pre-Defined-Time Adaptive Synchronization of the 4-D Hyper-Chaotic Chen-Qi-Like System[J]. Journal of Dynamics and Control,2025,23(2):83-92.

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  • 收稿日期:2024-01-29
  • 最后修改日期:2024-03-04
  • 在线发布日期: 2025-03-13
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