共查询到16条相似文献,搜索用时 140 毫秒
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基于模糊滑模控制(FSMC)方法研究了低音速机翼颤振的主动控制。提出一种模糊滑模控制方法,主要解决非线性气动弹性的浮沉和俯仰二维机翼的颤振问题。根据气动弹性机翼,设计了滑模面,建立了模糊滑模控制器,控制器能有效抑制颤振。与自适应控制技术相比较,结果显示模糊滑模控制收敛性更好。 相似文献
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空空导弹三维自适应模糊滑模制导律设计 总被引:1,自引:0,他引:1
提出了一种基于自适应模糊滑模控制的空空导弹三维制导律,解决了一般滑模控制中存在的抖振问题.该制导律在非线性系统的精确模型未知的情况下,通过模糊系统对非线性模型进行逼近,并根据Lyapunov方法设计了参数自适应律.仿真结果表明,该制导律与比例制导相比有较大的性能改善. 相似文献
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提出了适用于一类不确定离散时间系统的间接自适应模糊滑模控制策略。首先,根据指数趋近律得到离散滑模控制的理想控制律,然后,用两个模糊系统近似其中的未知函数,用第三个模糊系统近似切换控制。模糊系统的参数向量由带参数投影的自适应律在线调整。证明了该控制算法可以保证闭环系统状态有界,且跟踪误差收敛到原点的小邻域内。仿真结果在表明算法有效性的同时具备减轻振颤的能力。 相似文献
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提出了适用于一类不确定离散时间系统的间接自适应模糊滑模控制策略。首先,根据指数趋近律得到离散滑模控制的理想控制律,然后,用两个模糊系统近似其中的未知函数,用第三个模糊系统近似切换控制。模糊系统的参数向量由带参数投影的自适应律在线调整。证明了该控制算法可以保证闭环系统状态有界,且跟踪误差收敛到原点的小邻域内。仿真结果在表明算法有效性的同时具备减轻振颤的能力。 相似文献
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基于模糊神经网络滑模控制器的一类非线性系统自适应控制 总被引:2,自引:0,他引:2
本文研究了一类不确定性非线性系统的自适应控制,在模糊神经网络滑模控制器(Fuzzy nerual Networks sliding Mode Controlle )的基础上提出了一种设计方法,将FNNSMC与带死区的滑模控制器(Sliding mode Controller with Dead Zone)有机结合,通过平滑切换实现自适应控制,这种方法使系统不仅有好的鲁棒性而且能有效地消除离频动,同时 相似文献
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《Mechatronics》2021
This paper proposes a novel adaptive hierarchical control approach for Steer-by-Wire (SbW) vehicles to improve the handling stability. The high-level stability control scheme contains a variable steering ratio (VSR) strategy based on the adaptive-network-based fuzzy inference system (ANFIS) and an active front steering (AFS) controller designed with the integral sliding mode method by tracking the expected yaw rate, in which the desired front wheel angle is generated to enhance the cornering stability performance. Besides, an adaptive tracking controller (ATC) for the SbW system is designed by using the adaptive sliding mode control method to achieve desired steering performance in the lower level. The proposed adaptive control strategy is validated with different driving circles from ISO standards in simulation tests and hardware-in-the-loop (HiL) experiments. The results demonstrate that the designed control approach improve the vehicle handling stability significantly, even in some extreme driving conditions. 相似文献
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针对电液伺服系统的跟踪控制问题,在系统模型不确定性参数的界未知的情况下,提出一种自适应滑模控制方案。该方案的主要思想是用滑模方法抑制系统中的外干扰力扰动,对系统不确定性参数进行自适应估计,用估计值来补偿不确定性参数的变化。对于系统全局稳定性,采用李雅普诺夫稳定性理论给出了严格的证明。仿真结果表明了该方案具有良好的跟踪性能和鲁棒性。 相似文献
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Adaptive sliding controller with self-tuning fuzzy compensation for vehicle suspension control 总被引:2,自引:0,他引:2
Since the hydraulic actuating suspension system has nonlinear and time-varying behavior, it is difficult to establish an accurate dynamic model for a model-based sliding mode control design. Here, a novel model-free adaptive sliding controller is proposed to suppress the position oscillation of the sprung mass in response to road surface variation. This control strategy employs the functional approximation technique to establish the unknown function for releasing the model-based requirement. In addition, a fuzzy scheme with online learning ability is introduced to compensate the functional approximation error for improving the control performance and reducing the implementation difficulty. The important advantages of this approach are to achieve the sliding mode controller design without the system dynamic model requirement and release the trial-and-error work of selecting approximation function. The update laws for the coefficients of the Fourier series functions and the fuzzy tuning parameters are derived from a Lyapunov function to guarantee the control system stability. The experimental results show that the proposed control scheme effectively suppresses the oscillation amplitude of the vehicle sprung mass corresponding to the road surface variation and external uncertainties, and the control performance is better than that of a traditional model-based sliding mode controller. 相似文献
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首先利用非线性控制方法中的积分反步法设计了一种AQM算法,接着使用非线性控制方法中的模糊滑模变结构控制方法进行AQM算法的设计.仿真结果表明,与积分反步法相比,基于模糊滑模变结构控制的AQM算法性能上优于基于积分反步法的AQM算法.与基于线性控制方法的PID控制方法相比,基于积分反步法的AQM算法性能上优于基于PID控制的AQM算法. 相似文献
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为考虑拦截导弹控制回路动态,所设计的滑模制导律在实际应用中往往涉及到不可量测的反馈状态变量和不确定性的内部参数等问题。采用自适应控制和观测方法,给出了一种基于观测器的自适应滑模制导律,观测器主要用于实现对系统状态,如视线角速度的高阶导数和有界不确定项,如相对运动速度的高阶导数等的在线估计,从而满足实际情形下的可执行性要求。制导律推导中考虑到了拦截导弹具有一阶机动动态的情形,且该方法也可以推广到具有高阶机动动态下的设计。非线性系统仿真表明,相比于传统的比例导引和滑模制导律,该制导律在足够的机动性能下,不仅可以实现对机动目标的碰撞拦截,且具有较强的机动性能和拦截性能优势,同时仿真结果也表明了所设计的观测器的有效性。 相似文献
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Fuzzy sliding-mode controllers with applications 总被引:5,自引:0,他引:5
Ha Q.P. Nguyen Q.H. Rye D.C. Durrant-Whyte H.F. 《Industrial Electronics, IEEE Transactions on》2001,48(1):38-46
This paper concerns the design of robust control systems using sliding-mode control that incorporates a fuzzy tuning technique. The control law superposes equivalent control, switching control, and fuzzy control. An equivalent control law is first designed using pole placement. Switching control is then added to guarantee that the state reaches the sliding mode in the presence of parameter and disturbance uncertainties. Fuzzy tuning schemes are employed to improve control performance and to reduce chattering in the sliding mode. The practical application of fuzzy logic is proposed here as a computational-intelligence approach to engineering problems associated with sliding-mode controllers. The proposed method can have a number of industrial applications including the joint control of a hydraulically actuated mini-excavator as presented in this paper. The control hardware is described together with simulated and experimental results. High performance and attenuated chatter are achieved. The results obtained verify the validity of the proposed control approach to dynamic systems characterized by severe uncertainties 相似文献