4. The optimal control problem for enzymatic reaction system
Our main objective is to control the rate of stirrer (i.e. mass
transfer rate), so that we can get maximum production of biodiesel.
Also, it is our object to keep the cost function as low as possible.
We use a control variable uðtÞ, which represents the stirring activator
input at time t satisfying 0 6 uðtÞ 6 1. Here uðtÞ represents control
input with values normalized to be between 0 and 1 [48]. Also
uðtÞ ¼ 1 represents the maximal use of stirrer and uðtÞ 0, which
signifies no change in stirrer rotation.
Based on the above assumptions, the control induced system
corresponding to the system (7) would be: