Analytical expressions for relay responses of systems

Identification of two‐input two‐output process using state‐space analysis

“…The analytical expressions of relay feedback responses were derived by Majhi and Atherton for small time delay second‐order process [6], further extended for unstable first‐order plus delay time (FOPDT) process under existing limit cycle [7]. Panda et al [8, 9] modelled the feedback relay response of second‐order plus dead time processes with different damping coefficients in the time domain for SISO and two‐input two‐output (TITO) processes. The step test for SISO and decentralised auto tuning of TITO processes were introduced by Wang et al [10].…”