**5. Engineering Examples**

In this section, the SRIRMD-STOR method is applied to optimize the 3-DOF Manutec r3 system and the horizontal axis wind turbine (HAWT) system. Different from the numerical examples, the derivative functions of the state equations are unknown in those dynamic systems, since only the simulation models can be accessed. In addition to the methods proposed in this work, other existing methods are also used to optimize the 3-DOF Manutec r3 system and HAWT system.
