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On-line optimizing control of bulk polymerization of methyl methacrylate: Some experimental results for heater failure

机译：甲基丙烯酸甲酯本体聚合的在线优化控制：加热器故障的一些实验结果

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An experimental unit has been assembled to carry out on-line optimizing control of the bulk polymerization of methyl methacrylate (MMA). A rheometer-reactor assembly is used. Temperature and viscosity measurements are used to describe the state of the system. The polymerization is carried out under an off-line computed optimal temperature history, T-op(t). A planned disturbance (heating system failure) is introduced at time t(1) This disturbance leads to a fall in the temperature of the reaction mass. A new optimal temperature history, T-reop(t), is re-computed on-line and is implemented on the reaction mass at time t(2) when the heating is resumed. This procedure helps 'save the batch'. A genetic algorithm is used to compute this reoptimized temperature history in a short period of similar to2 min of real time. The feasibility of the on-line optimizing control scheme has been demonstrated experimentally. Replicable results for the viscosity history, eta(t), of the polymerizing mass under several non-isothermal conditions have been obtained. These experimental results are quite trustworthy, even though the model predictions are only in approximate agreement with them, perhaps because of the extreme sensitivity of results to the values of the model parameters. (C) 2002 Wiley Periodicals, Inc. [References: 16]
机译：已组装了一个实验装置，以对甲基丙烯酸甲酯（MMA）的本体聚合进行在线优化控制。使用了流变仪-反应器组件。温度和粘度测量值用于描述系统状态。在离线计算的最佳温度历史T-op（t）下进行聚合。在时间t（1）引入了计划的扰动（加热系统故障），该扰动导致反应物料温度下降。在线重新计算新的最佳温度历史记录T-reop（t），并在恢复加热时的时间t（2）对反应质量进行实施。此过程有助于“保存批次”。遗传算法用于在类似于实时2分钟的短时间内计算此重新优化的温度历史记录。实验证明了在线优化控制方案的可行性。已经获得了在几种非等温条件下聚合物料的粘度历史记录η（t）的可复制结果。这些实验结果是非常值得信赖的，即使模型预测仅与它们大致吻合，也许是因为结果对模型参数的值极为敏感。 （C）2002 Wiley Periodicals，Inc. [参考：16]

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