Heat Transfer in Gas-Solid Packed Bed Systems. 1. A Critical Review

G, = noise generator k = integral value of B/T K , = controller gain K , = process gain n, = noise sequence s = Laplace transform variable s, = coefficients of the polynomial 6(B) (denominator of G,(B)) t = time T = sampling interval X,(B) = transfer function of forward loop controller (Table 111) y = system output ut = controller signal a = relative perturbation in process parameters = relative perturbation in process time delay r ( B ) = polynomial resulting from factorization (Appendix) y, = coefficients of y ( B ) 6(B) = denominator of G,(B)