共查询到18条相似文献,搜索用时 78 毫秒
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针对DMC算法无法直接对非自衡对象进行控制的特点,推导出了一种基于非自衡对象阶跃响应的改进动态矩阵控制算法。该算法对DMC预测模型的误差,采用实际输出的变化趋势校正。仿真结果表明,所提出的算法对于设定值有良好的跟踪特性,具有很强的抗干扰能力和快速调节性能,验证了本文方法对非自衡对象控制的有效性。 相似文献
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基于阶跃响应的非自衡对象预测控制 总被引:10,自引:0,他引:10
针对现有非自衡对象DMC算法预测模型不易建立的局限性,提出一种基于非自衡对象阶跃响应的DMC算法。分析与仿真结果表明,该算法对于设定值变化和输入扰动均无控制余差,且预测模型易于建立。 相似文献
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非自衡时滞对象的改进内模控制 总被引:2,自引:0,他引:2
针对化工生产中常见的具有积分和时滞特性的过程对象,采用一种改进的两自由度内模控制方案.其中一个新增的控制器用于设定值跟踪响应的期望极点配置,利用直接合成法设计设定值跟踪控制器;另一个新增的控制器用于稳定对象和抑制扰动,并采用期望闭环余灵敏度法确定控制器.设定值跟踪控制器和扰动抑制控制器可通过性能参数独立调节,并保证系统具有较好的鲁棒稳定性.最后,通过仿真实例验证了控制方案的有效性. 相似文献
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在最优控制问题的研究中,工业过程控制领域中不稳定系统的控制难度比较大,且在许多控制系统设计中控制能量可能成为重要的性能指标。对控制能量存在约束时不稳定过程的最优控制问题进行了研究与仿真,优化问题的难点在于性能指标的表示与最小化。首先基于不稳定过程的互质分解,由敏感度函数和控制敏感度函数定义了一个包含跟踪误差和控制能量在内的性能指标,采用谱分解最小化该性能指标,从而为不稳定系统导出了一种最优的控制器设计方法,可使系统获得最优的控制性能。仿真结果进一步说明了方法的有效性。 相似文献
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In this paper, we develop a computational method for a class of optimal control problems where the objective and constraint functionals depend on two or more discrete time points. These time points can be either fixed or variable. Using the control parametrization technique and a time scaling transformation, this type of optimal control problem is approximated by a sequence of approximate optimal parameter selection problems. Each of these approximate problems can be viewed as a finite dimensional optimization problem. New gradient formulae for the cost and constraint functions are derived. With these gradient formulae, standard gradient-based optimization methods can be applied to solve each approximate optimal parameter selection problem. For illustration, two numerical examples are solved. 相似文献
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Because there are large state fluctuation of working conditions, excessive energy consumption caused by manual operation in the dynamic transient procedure for copper flash smelting process. Working conditions of copper flash smelting process must be adjusted to the complex and variable copper concentrate feeding to satisfy the smelting performance. Optimal control strategy based adjustment cost for copper flash smelting working condition transition is proposed, which can achieve the expected working condition by following the optimal working condition transition path. The Cauchy–Schwarz inequality-based two-level matching method is developed to set the expected working condition. Then with minimizing adjustment cost and restricting operation domain to optimize smelting performance indicators, the optimal control problem of working condition transition is converted into a multi-constraints optimization problem with two fixed ends. A Legendre pseudospectral-based optimization method is also presented to obtain the path of optimal working condition transition. The simulation results of actual production data collected are given to verify the effectiveness and feasibility of the proposed strategy. 相似文献
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Integrator processes with long delay are
difficult to control. Nonlinear characteristics of actuators make
the control problem more challenging. A technique is proposed in
this paper for global satisfactory control (GSC) of such processes
with relay-type nonlinearity. An oscillatory control signal is
injected into the nonlinear process; the amplitude and frequency of
the oscillatory signal are designed to linearise the nonlinear
process in the sense of harmonic analysis; and a state feedback
controller is configured to implement GSC over the linearised
process. An illustrative example is given to demonstrate the
effectiveness of the proposed method. 相似文献
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Integrator processes with long delay are difficult to control. Nonlinear characteristics of actuators make the control problem more challenging. A technique is proposed in this paper for global satisfactory control (GSC) of such processes with relay-type nonlinearity. An oscillatory control signal is injected into the nonlinear process; the amplitude and frequency of the oscillatory signal are designed to linearise the nonlinear process in the sense of harmonic analysis; and a state feedback controller is configured to implement GSC over the linearised process. An illustrative example is given to demonstrate the effectiveness of 相似文献