摘要：The modeling of physical systems is of great im-portance within all engineering fields because it allows usto understand the behavior of the system without havingto experiment on it. It also allows the determination ofcertain characteristics of the system, and can give impor-tant information on operating conditions with the use ofrelatively simple and inexpensive procedures. Moreover,it is an essential tool for the design of control strategies,which are very important at industrial level [1].
