Input Double Output Research Articles

Some Complexity Problems on Single Input Double Output Controllers

<p>We investigate the time complexity of constructing single input<br />double output state feedback controller structures, given the <br />directed structure graph G of a system. Such a controller structure<br />defines a restricted type of P3-partition of the graph G. A necessary<br /> condition (*) has been found and two classes of graphs have<br />been identified where the search problem of finding a feasible P3-<br />partition is polynomially solvable and, in addition, (*) is not only<br />necessary but also sufficient for the existence of a P3-partition. It<br />is shown further that the decision problem on two particular graph<br />classes - defined in terms of forbidden subgraphs - remains NP-<br />complete, but is polynomially solvable on the intersection of those<br />two classes. Moreover, for every natural number m, a stabilizing<br />structure with Single Input m-Output controllers can be found in<br />polynomial time for the system in question, if it admits one.</p>

Design of self-organising controller with dual outputs

A new fuzzy logic controller called a self-organising controller with dual outputs (SOCDO) is presented. The SOCDO has dual outputs in the basic level and updates its control rules as it monitors measures of performance. To implement the SOCDO, the authors regard an SISO process as a double input double output (DIDO) in the self-organising level. The advantage of the SOCDO is that it shows characteristics of PID even though it has only two inputs for the FLC, i.e. error and change of error, hence it yields both zero steady-state error and fast rising time.