Studies on the Identification and Control of Multi-rate Systems

多速率系统在化学过程工业中非常常见。这是因为想要调节的许多属性或质量变量不能以期望的那么快的采样率获得。通常，主要测量（例如组成、密度或分子量分布测量）花费几分钟或甚至超过一小时的分析时间。另一方面，诸如流速、温度和压力的二次测量以相对快的速率采样，并且通常可以以相对快的采样速率调整操纵变量，唯一的限制是主要变量的缓慢采样。本研究关注的是这种多速率系统的分析和设计，其中的输出或变量进行调节，只能在定期但缓慢的采样率和次要变量可以测量的操纵变量一样快，特别是，以下主题进行了研究。(1)多速率系统的自适应控制系统设计（2）多速率系统的模型输出跟踪控制系统设计（3）一种新型的无涟漪多速率控制系统设计（4）所提出的方法在机械伺服系统中的应用我们还与国际合作研究人员一起研究了化学多速率过程的辨识以及所提出的方法在CSTR等过程中的适用性。

Multirate systems are very common in the chemical process industry. This is so because many property or quality variables that one wants to regulate are not available at as fast a sample rate as one desires. Typically, the primary measurements such as the composition, density or molecular weight distribution measurements take several minutes or even more than one hour of analysis time. On the other hand secondary measurements such as flow-rates, temperatures and pressures are sampled at relatively fast rate, and usually the manipulative variables can be adjusted at relatively fast sample rates, the only limitation being the slow sampling of the primary variables. This research was concerned with the analysis and design of such multirate systems, where the outputs or the variables to be regulated are only available at regular but slow sample rates and secondary variables can be measured as fast as the manipulative variables; in particular, the following topics were studied.(1) Adaptive control system design for multirate systems(2) Design of a model output following control system for multirate systems(3) A novel ripple free multirate control system design(4) Application of the proposed method to mechanical servo systemsand we also examined identification of chemical multirate processes and applicability of the proposed method to process such as CSTR with international collaborative researchers.