Abstract
In this paper, we propose two sub-optimal control methods of sampled-data systems, which consider the trade-off between performance and the number of samplings. They are as follows: 1) Multirate sampled-data control method, in which each component of input may have a different constant sampling interval. 2) Quasivariable interval sampled-data control method, in which the sampling interval of each component of input need not be constant and can have integer multiple values of a basic interval T.
Two simple numerical examples show these methods are effective for practical uses.
