一种面向大规模定制生产模式下的工位配送方法研究

在“推动式”或“拉动式”生产过程中，生产配送是通过计划或看板实现的仓库被动配送模式。而在以订单为驱动的大规模定制生产模式下，这种被动配送方式已经不能满足动态的、不可预测的需求以及多品种、小批量的生产所要求的配送敏捷性和柔性。本文提出了一种以生产节拍为基础的工位库存模型，通过该模型来实现主动工位配送的敏捷配送方法，保证生产的稳定性和柔性。

Performance enhancement of IMC-PID controller design for stable and unstable second-order time delay processes

An IMC-PID controller was proposed for unstable second-order time delay system which shows the characteristics of inverse response(RHP zero). A plot of Ms versus λ was suggested to calculate the suitable tuning parameter λ, which provides a trade-off between performance and robustness. Six different forms of process models were selected from literature to show the applicability of the present method. Performance of controller was calculated by ITAE and total variation TV and compared with recently published tuning rules. Undesirable overshoot was removed by using a set-point weighting parameter. Robustness was tested by introducing a perturbation into the various model parameters and closed-loop results show that the designed controller is robust in the case of model uncertainty. The proposed method shows an overall better closed-loop response as compared to other recently reported methods.