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Because computer control operates on sampled data, z-transforms serve a similar purpose that the Laplace transforms provide for continuous control . This paper reports insight provided by z-transforms and how controller performance predicted by z-transforms compares with experimental results for a discharge-air-temperature controller. The root-locus technique using z-transforms can predict the gain limits that must be observed to keep the loop stable. Further strengths of the root-locus technique using z-transforms permit the construction of control algorithms to give the desired rise time, settling time, and damping ratio. The control algorithm would thus not be limited to strict proportional, proportional-integral, or proportional- integral-derivative control. The z-transform analysis assumes a linear system, although it does accommodate time delays. The degree of nonlinearity of the hardware influences the fidelity of the mathematical representation.
Units: Dual