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气弹控制系统的驱动器、闭环信号回路在实际中会存在时滞环节,由于气弹敏感性和环境复杂性,时滞会引起控制信号迟延并导致气弹控制极速恶化、甚至造成系统失稳,该问题以往研究较少。针对翼型时滞气弹控制问题,设计了一种基于BRGWO算法和改进型滤波Smith的最优气弹控制方法。首先,引入二阶滤波器改进Smith预估器,设计了翼型气弹控制器;然后,创新设计了一种双向随机灰狼优化算法(bidirectional random grey wolf optimization, BGWO),提高了时滞下气弹控制参数的全局寻优能力,该算法改进了不同等级灰狼的狩猎策略,提高跳出非理想值机率、避免陷入局部最优。利用最小增益原理,在理论上证明了闭环系统稳定性。仿真结果表明,对比传统智能优化算法(如遗传算法、灰狼优化算法)和多种已有控制器(经典Smith、PI-PD型Smith和传统滤波Smith预估器),该方法具有更强的时滞补偿能力和更优的气弹控制性能,在不确定时滞、不确定风速、刚度变化和驱动干扰等算例下,保持了优良的时滞气弹控制效果,具有较强的鲁棒性。 相似文献
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推导光电层合简支板结构动力学方程及模态控制方程,以规格化后模态控制力指数作为遗传算法的适应度函数,基于二进制编码的遗传算法对用于简支板振动控制的单对、双对光致伸缩驱动器布局进行优化,计算机仿真结果表明优化后的驱动器布局方案可有效提高板结构振动控制的有效性。在此基础上进一步对板结构多模态振动控制进行探讨,提出适用于板结构多模态振动控制的驱动器布局优化方法及振动控制方案,仿真算例表明该方法可有效地对简支板前二阶模态进行振动无线控制。 相似文献
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针对双塔结构所具有的模型不精确及承受随机外力作用这一特点,为保证系统控制的顺利实现,采用了广义预测控制策略.在优化目标选择方面,以控制增益矩阵的Frobenius范数及控制效果作为优化目标,并采用遗传算法进行优化,通过优化得到了几组次优解,这些解可以供设计者进行选择.最后给出了计算实例.算例表明这一方法是有效的. 相似文献
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挠性结构主动减振中传感器和激振器的优化布置 总被引:3,自引:0,他引:3
本文提出了从有效衰减振动能量的角度,通过最小化Lyapunov第二方法中的优化性能指标,对挠性结构振动的主动控制进行优化的方法。研究了在以位移传感器或速度传感器作为检测元件进行部分状态变量反馈的约束条件下,传感器、激振器的最优位置以及最优反馈增益的确定,讨论了在包括截尾残余模态的情况下系统的稳定性。本文还对在两邻边固定、另两邻边自由的边界条件下矩形薄板振动的主动控制进行了优化计算和数字仿真。结果表明,优化的控制系统能够有效地衰减结构的振动。本方法具有明显的物理意义和较高的计算速度,并且通过选取不同的权系数,能够协调控制能量和振动的衰减效果,从而得到合理的位置和增益。 相似文献
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基于遗传算法的结构主动控制 总被引:10,自引:2,他引:8
提出了应用遗传算法进行结构主动控制的新方法,该方法能够在线计算控制力,对结构实施控制,并提出了解决该控制系统中时间滞后问题的方法,为该控制系统在实际中的应用打下了基础。 相似文献
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LIU Hong-yan HUANG Yu-mei SHI Wen-hao ZHAO Xing-wen 《国际设备工程与管理》2007,12(2):87-92
A novel control method has been proposed by using the genetic algorithm (GA) for nonlinear and complex plants. The proposed control strategy is based on a variable structure control, it overcomes the defects of other adaptive methods such as strong dependence to the system. A GA is used to learn to optimally select integral coefficient C. Simulation results verified the effectiveness of the controller. For position control of Direct Current (DC) motor in practice, this method has good performance and strong robustness, and both dynamic and steady performances were improved. 相似文献
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An approach that combines genetic algorithm (GA) and control vector parameterization (CVP) is proposed to solve the dynamic optimization problems of chemical processes using numerical methods. In the new CVP method, control variables are approximated with polynomials based on state variables and time in the entire time interval. The iterative method, which reduces redundant expense and improves computing efficiency, is used with GA to reduce the width of the search region. Constrained dynamic optimization problems are even more difficult. A new method that embeds the information of infeasible chromosomes into the evaluation function is introduced in this study to solve dynamic optimization problems with or without constraint. The results demonstrated the feasibility and robustness of the proposed methods. The proposed algorithm can be regarded as a useful optimization tool, especially when gradient information is not available. 相似文献
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以柔性板为对象,开展时滞H∞反馈控制的理论与实验研究。首先通过一种特殊形式的积分变换,将时滞方程转化为无时滞的标准状态方程形式,然后采用线性矩阵不等式设计H∞控制律,最后开展数值仿真与实验验证。结果显示,所给时滞H∞控制律不但可以处理小时滞量问题,也能处理大时滞量问题,而且具有对结构固有参数和时滞量不确定性的鲁棒性。 相似文献
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研究了载体姿态受控、位置不受控制情况下, 具有时间延迟的漂浮基双臂空间机器人载体姿态与末端爪手工作空间协调运动的动力学建模与控制问题。利用系统动量守恒关系及Lagrange方法, 建立了漂浮基双臂空间机器人的系统动力学模型及运动Jacobi 关系。以此为基础, 考虑到系统存在时间延迟的复杂情况, 利用Taylor级数展开, 导出了适用于时间延迟情况下控制系统设计的数学模型。利用该模型, 提出了一种双臂空间机器人在时间延迟情况下的改进计算力矩控制方案。而后, 运用Lyapunov 第二类方法, 结合图形分析以及范数的方法证明了该控制系统的稳定性。数值仿真结果证实了该控制方案在系统存在时间延迟的情况下, 仍然可以有效地控制双臂空间机器人, 稳定地追踪工作空间的期望轨迹。 相似文献
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In this article, a new hybrid method based on the combination of the genetic algorithm (GA) and artificial neural network (ANN) is developed to optimize the design of three-dimensional (3-D) radiant furnaces. A 3-D irregular shape design body (DB) heated inside a 3-D radiant furnace is considered as a case study. The uniform thermal conditions on the DB surfaces are obtained by minimizing an objective function. An ANN is developed to predict the objective function value which is trained through the data produced by applying the Monte Carlo method. The trained ANN is used in conjunction with the GA to find the optimal design variables. The results show that the computational time using the GA-ANN approach is significantly less than that of the conventional method. It is concluded that the integration of the ANN with GA is an efficient technique for optimization of the radiant furnaces. 相似文献
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A surrogate assisted evolutionary optimization method with application to the transonic airfoil design 总被引:1,自引:0,他引:1
Ava Shahrokhi 《工程优选》2013,45(6):497-515
A multi-layer perceptron neural network (NN) method is used for efficient estimation of the expensive objective functions in the evolutionary optimization with the genetic algorithm (GA). The estimation capability of the NN is improved by dynamic retraining using the data from successive generations. In addition, the normal distribution of the training data variables is used to determine well-trained parts of the design space for the NN approximation. The efficiency of the method is demonstrated by two transonic airfoil design problems considering inviscid and viscous flow solvers. Results are compared with those of the simple GA and an alternative surrogate method. The total number of flow solver calls is reduced by about 40% using this fitness approximation technique, which in turn reduces the total computational time without influencing the convergence rate of the optimization algorithm. The accuracy of the NN estimation is considerably improved using the normal distribution approach compared with the alternative method. 相似文献
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Tarapada Roy Debabrata Chakraborty 《International Journal of Mechanics and Materials in Design》2009,5(1):45-60
The present article deals with the design of optimal vibration control of smart fiber reinforced polymer (FRP) composite shell
structures using genetic algorithm (GA) based linear quadratic regulator (LQR) and layered shell coupled electro-mechanical
finite element analysis. Open loop procedure has been used for optimal placement of actuators considering the control spillover
of the higher modes to prevent closed loop instability. An improved real coded GA based LQR control scheme has been developed
for designing an optimal controller in order to maximize the closed loop damping ratio while keeping actuators voltages within
limit. Results show that increased closed loop-damping has been achieved with a large reduction of control effort considering
control spillover. 相似文献