六、分布参数系统的控制有时,要控制的系统不是几个参数的演化,而是一个场的演化,例如温度场、弹性振动、人造地球卫星中液体燃料的晃动、化工系统中浓度与温度等等的控制.场的演化一般表达成偏微分方程,或函数空间中的微分方程.这种系统叫做分布参数系统.这种系统比集中参数系统(即一、二节中所论的那种由常数微分方程描述的系统)复杂得多.许多新问题被提出来. Control of Distributed Parameters System Sometimes the system to be controlled is not evolution of several parameters but a field evolution such as temperature field, elastic vibration, shaking of liquid fuel in artificial earth satellite, concentration and temperature in chemical system, etc. Etc. The evolution of a field is generally expressed as a partial differential equation or a differential equation in a function space Such a system is called a distributed parameter system which is more efficient than a centralized parameter system Systems described by constant differential equations are much more complex and many new problems are raised.