重庆大学_过程控制_process_control_中文_翻译_第一章课件.ppt

* How Does It Do? Control Evaluation控制效果评价 Being used to satisfied the three basic needs:用来满足三个基本的需要 Reduce the influence of external disturbances Promote the stability of the process Enhance the performance of the process * How Does It Do? Controlling the Temperature From Equipment Standpoint: Four Basic Elements in a Control System四个基本要素的控制系统 * How Does It Do? Controlling the Temperature Control Equipment * How Does It Do? Controlling the Temperature Process Equipment * How Does It Do? Control Equipment Example 1 need to regulate the flow 需要调节流量 robustly shut off if needed 需要稳定的开关 * How Does It Do? Control Equipment Example 2 low flow resistance when open开路时电阻低流量 infrequently used but need reliability不经常使用但需要牢固 * How Does It Do? Control Equipment- Example 3 need good rangeability, 需要良好的可调范围 flow resistance okay,流阻好 robust shutoff needed 鲁棒关闭需要 * How Does It Do? Control Equipment Example 4 low flow resistance低流阻 good control abilities * Example 5 not a control valve, vents if pressure is too high 不能控制阀口，如果压力过高 How Does It Do? Examples of Control Equipment * How Does It Do? Control Equipment Process Equipment– Your Examples? Depending on the application areas根据应用领域 Being characterized with the special knowledge作为具有的特别的知识 Example 6 prevent backflow防止回流 * How Does It Do? Theoretical Modeling理论模型 Physical/chemical laws (fundamental, global) Material/energy balances Heat, mass, and momentum transfer Thermodynamics, chemical kinetics Physical property relationships 物理/化学法(基本,全球) 物质/能量守恒 热量、质量、动量传递 热力学、化学动力学 物理性质的关系 * How Does It Do? Theoretical Modeling Conservation Law 守恒律 Conservation of Component i * Introduction to Process Control Theoretical Modeling The first law of thermodynamics热力学第一定律 * Introduction to Process Control介绍过程控制 Aspects of Theoretical Modelling方面的理论模型 Model complexity assumptions模型复杂性的假设 Computationally expensive (not real-time)计算量大的 Expensive/time-consuming for extrapolation and scal