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南京理工大学 电子工程与光电技术学院,江苏 南京 210094
Received:05 November 2021,
Published:28 March 2023
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Meng ZHOU, Weixian QIAN, Kan REN. Study of the Guidance Law for Super-Twisting Sliding-Mode Guided Projectiles with Multiple Constraints[J]. Acta Armamentarii, 2023, 44(3): 799-805.
Meng ZHOU, Weixian QIAN, Kan REN. Study of the Guidance Law for Super-Twisting Sliding-Mode Guided Projectiles with Multiple Constraints[J]. Acta Armamentarii, 2023, 44(3): 799-805. DOI: 10.12382/bgxb.2021.0776.
针对末制导过程中出现的加速度、落点和落角等多约束问题,研究一种多约束2阶超螺旋滑模制导律。将弹目相对运动方程转化为标准2阶系统模型,基于超螺旋(ST)算法设计2阶滑模制导律,使系统能够快速达到收敛,满足对落角的导引精度需要;采用饱和函数代替符号切换函数,消除滑模变结构算法固有的抖振问题;为解决加速度受限问题,设计带辅助系统(AS)的制导律。数字仿真结果表明,所设计的制导律能以期望的攻击角度和落角精确命中目标,与现有的1阶滑模制导律相比,收敛速度更快,制导精度更高。
Regarding the terminal guidance with accelerated speed
impact point and impact angle constraints
an multiple-constraint super-twisting guidance law for guided projectiles is proposed. First
to simplify the design process
the relative motion model of the missile and the target is converted into a standard second-order form. By applying the Super-Twisting (ST) algorithm
the guidance system can realize convergence faster. By replacing the sign function with saturation function
vibration is decreased. Moreover
an auxiliary guidance scheme is designed by adopting the auxiliary system (AS) theory to solve the problem of accelerated speed constraints. The simulation results indicate that suggested super-twisting sliding-mode guidance law is highly precise and can realize anti-windup control.
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WANG Y H , TONG H Y , REN H L . NESO-based path following control for underactuated hovercrafts with unknown nonlinear uncertainties and a safety limit constraint [J ] . Applied Sciences , 2020 , 10 ( 15 ): 5287 . DOI: 10.3390/app10155287 http://doi.org/10.3390/app10155287 https://www.mdpi.com/2076-3417/10/15/5287 https://www.mdpi.com/2076-3417/10/15/5287 In this brief, the path following control problem of underactuated hovercrafts subject to nonlinear time-varying uncertainties and a safety limit constraint (SLC) is addressed. A novel homogenous nonlinear extended state observer (NESO)-based safe motion controller for a path following control scenario of underactuated hovercrafts is proposed. First, a NESO is constructed to estimate and compensate the nonlinear time-varying uncertainties for the underactuated hovercraft. Then, a NESO-based backstepping sliding mode control (BSMC) law with a turning SLC is proposed to achieve the yaw control for underactuated hovercrafts, which improves both safety and maneuverability of the underactuated hovercraft during the path following control scenario. The nonlinear time-varying turning SLC is first directly taken into the control system design, which is achieved by introducing an auxiliary dynamic system to limit the virtual input control during the backstepping design process. A NESO-based backstepping surge control law is also designed to achieve the surge control for underactuated hovercrafts. Furthermore, all error signals of the proposed closed-loop control system are proven to be bounded. Finally, an application case is tested on an underactuated hovercraft to illustrate the effectiveness and superiority of the designed control scheme.
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