共查询到17条相似文献,搜索用时 52 毫秒
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针对含有执行器非线性的车辆队列控制系统, 提出一种固定时间全局预设性能控制(Global prescribed performance control, GPPC) 控制方法. 首先, 设计一种平滑等效变换, 在同一框架下解决死区及饱和问题, 同时消除执行器非线性固有拐点问题. 其次, 构造两个新型性能函数, 并基于此提出一种全局预设性能控制算法, 实现如下目标: 1) 保证跟踪误差在固定时间内收敛到预定稳态区域; 2) 消除初始误差必须已知的限制; 3) 减小误差的超调量. 然后, 基于上述等效变换及预设性能控制算法, 设计一种固定时间滑模队列容错控制方案, 实现固定时间单车稳定及队列稳定. 最后, 通过 MATLAB 仿真实验, 验证了所提算法的有效性. 相似文献
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为了优化车辆队列在长距离行驶过程中的能源消耗,对空气流动阻力下车辆队列能耗优化间距策略以及相应的队列控制方法进行了研究;首先根据车辆队列在行驶过程中受到的空气流动阻力,建立基于异构风阻系数的车辆动力学模型;其次,设计基于滑模控制的非线性车辆队列控制方法,使其能够在不同风阻系数下稳定地收敛到期望的车辆队列;在此基础上,构建稳态下车辆队列能量消耗评价模型,并通过优化分析,计算能量消耗最优下的车辆队列期望车间距;最后通过数值仿真的手段验证所提控制方法的有效性与可行性;该结果表明:所设计的控制器能够使整个车辆队列达到期望的控制效果;得到的最优车间距能够使得特定条件下车辆队列稳态能量消耗降低。 相似文献
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针对通信延时环境下的异质车辆队列控制问题, 本文提出了一种基于三阶模型的分布式非线性车辆队列纵向控制器. 首先, 基于三阶动力学模型描述了车辆的异质特性. 考虑车辆跟驰行为以及异质通信延时, 提出一种通信延时环境下的异质车辆队列非线性控制器. 所提控制器不仅可以在通信延时以及车辆异质特性的影响下实现队列中车辆的位置、速度以及加速度的一致性, 而且可以有效避免负的车辆间距和不合理的加/减速度, 保证车辆的运动行为符合交通流理论. 然后, 利用Lyapunov-Krasovskii定理对车辆队列的稳定性进行分析, 得出车辆队列的稳定性条件和通信延时上界. 最后, 所提控制器的有效性和稳定性通过数值仿真得到验证. 相似文献
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Linying Lu;Xiaohong Jiao;Ting Zhang; 《国际强度与非线性控制杂志
》2024,34(7):4554-4575
》2024,34(7):4554-4575
In the face of external disturbances, the autonomous vehicle with a high center of gravity is exposed to the risk of roll instability during trajectory tracking. To this end, this paper aims to propose a vector-extended-state-observer (VESO)-based adaptive fixed-time terminal sliding mode prescribed performance control strategy, which coordinates the front wheel steering angle and external roll moment to ensure the roll stability of the high center of gravity autonomous vehicle while improving the tracking dynamic and steady state performances. The VESO for estimating the external disturbance is designed to enhance the robustness outside the sliding mode surface, based on which the adaptive updating laws compensate the estimation errors to provide the control system's dynamic performance. A fixed-time sliding mode control with prescribed performance is proposed, which combines a fixed-time prescribed performance control method to further improve the transient performance and steady-state accuracy. The double lane-changing reference trajectory tracking conditions under different vehicle driving speeds and initial errors settings are verified by simulation in MATLAB/Simulink environment, and the results show that the proposed control strategy can ensure the rolling stability of the vehicle, can track the reference trajectory accurately and quickly, and has strong robustness. 相似文献
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考虑实际操纵工况特别是低附着路面条件对汽车队列动力学稳定性的影响,提出针对异质汽车队列的自适应协调控制策略.建立包含车轮旋转动力学的队列分布式控制器设计模型,将车速-轮速误差引入队列的跟驰控制决策以协调车辆动力学与队列动力学,将路面附着引入间距策略以适应路面工况的变化.首先,以保证节点车辆的动力学稳定性和队列的跟驰控制性能为目标,基于滑模控制方法设计队列自适应协调控制策略,并基于Lyapunov方法证明队列跟驰的间距误差以及车速-轮速误差一致最终有界,导出兼顾车辆动力学的队列稳定性条件.然后,基于4辆车组成的异质汽车队列,在高、低两种路面附着工况下对控制方案进行仿真评价.仿真结果表明,所提出的自适应协调控制策略通过对节点车辆动力学和队列动力学的协调控制,能够保证汽车队列系统在大范围操纵工况特别是低附着路面工况下的车辆动力学稳定性、队列稳定性和交通流稳定性. 相似文献
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针对协作式车队机动过程中存在燃油或制动延时的情况,建立车辆与车队动力学模型,综合考虑本车与相邻前车间的局部信息及领头车的全局信息,提出协作车队纵向控制策略.从避免Slinky-Effects效应出发,得到车队队列稳定条件,根据Lyapunov-Razumikhin方法证明车队中单车稳定性,并将两者相结合共同确定燃油或制动延时界限.在此基础上,分析车间距稳态误差及车队抖动与碰撞的避免条件.最后通过数字仿真检验上述设计,仿真结果对比表明了所提出控制策略具有较好的控制效果. 相似文献
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本文研究了网联车辆编队的节油速度轨迹优化和分布式控制问题. 考虑异质车辆编队节油, 采用一种基于滚动时域优化的速度规划算法, 求解出适应于变化道路坡度的编队整体节油速度. 此外, 为了提高速度规划和调节的灵活性, 提出了一种基于期望编队速度的二次间距策略. 采用基于间距误差最小化的分布式凸优化算法对轨迹优化问题进行求解, 为所有跟随车提供最优轨迹. 在此基础上, 设计了一种具有双幂次趋近律的PID型滑模控制器, 使得各跟随车跟踪最优轨迹. 仿真结果表明, 该方法可在忽略空间和速度扰动的情况下保证车辆的内部稳定性和队列稳定性. 相似文献
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The issue of achieving prescribed-performance path following in robotics is addressed in this paper, where the aim is to ensure that a desired path within a specified region is accurately converged to by the controlled vehicle. In this context, a novel form of the prescribed performance guiding vector field is introduced, accompanied by a prescribed-time sliding mode control approach. Furthermore, the interdependence among the prescribed parameters is discussed. To validate the effectiveness of the proposed method, numerical simulations are presented to demonstrate the efficacy of the approach.
相似文献16.
In this paper, a nonoverestimated adaptive prescribed performance sliding mode control algorithm based on time-varying barrier function is proposed, for high-order integrator systems subject to bounded but unknown disturbances. The developed algorithm has some remarkable features. Firstly, it is able to ensure that the system states are confined in a performance function from the initial instant. Secondly, it is easy-implementable and some exponential stability and practical fixed-time stability algorithms can be easily obtained. Finally, with the system states to be known, the size of the performance function is independent of the upper bound of the external disturbance. To show the efficiency of the developed algorithm, some numerical simulations are provided. 相似文献
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Changchun Hua Jiannan Chen Yafeng Li 《International journal of systems science》2017,48(12):2499-2508
This paper investigates the leader-follower formation problem for a group of quadrotors. Finite-time control scheme and prescribed performance control method, which are regarded as two highlights, are introduced in this paper. First, a control scheme with prescribed performance is used to control the translational movements to ensure the quadrotors obtain a relative gentle transient process and an adjustable steady-state error bound. Then, the desired orientations for the rotation subsystem provided by translational movements part are stabilised by a fixed-time control law. Finally, by designing a finite-time formation controller, followers can track the desired position and heading angle in finite time, which is important for the practical application. Several simulation results are given to show the effectiveness of the designed control strategy. 相似文献