D. Gorinevsky et al., Performance analysis of cross-direction process control using multivariable and spectral models, IEEE CON SY, 8(4), 2000, pp. 589-600
This paper addresses two interrelated problems in cross-directional (CD) co
ntrol of paper making processes. The first problem is explaining paper prop
erty streaks observed in many CD control installations. The streaks usually
correspond to the high-resolution error profile harmonics with wavelength
close to twice the actuator sparing. Typically, the streaks of paper weight
or moisture are very stable, A question that often arises is whether the s
treaks can be compensated by better tuning of the CD controller, The second
, related, problem addressed in this paper is how the achievable high-resol
ution error profile and its spectrum depend on the CD controller tuning. Th
is paper compares the performances of a mapped controller and an optimal mu
ltivariable controller. It also describes spectral characteristics of CD er
ror profile around the Nyquist frequency, We demonstrate applications of th
e developed analysis methodology to paper mill data where weight streaks ar
e a problem.