Now it is easy to obtain large amount of data due to widely used DCSs.It is necessary to assess the control performance from these data.

• 目前的过程控制中普遍采用DCS系统,很容易从中得到大量的过程运行数据,如何有效利用这些数据分析控制回路的性能就成为很有价值研究课题。