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Polymer extrusion / Zhijun Jiang in Industrial & engineering chemistry research, Vol. 51 N° 45 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14759-14770 Titre : Polymer extrusion : From control system design to product quality Type de document : texte imprimé Auteurs : Zhijun Jiang, Auteur ; Yi Yang, Auteur ; Shengyong Mo, Auteur Année de publication : 2013 Article en page(s) : pp. 14759-14770 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : System  design  Control  system Résumé : As a major polymer processing technique, polymer extrusion is a continuous process, during which material properties, machine variables, and process variables interact with each other to determine the final product quality. Precise control of key process variables such as barrel temperatures and melt pressure are crucial to ensure a good product quality in the extrusion process. In this paper, the overall extruder control system is constructed by two independent control loops, a single-input―single-output (SISO) control of the melt pressure at die output, and a multiinput―multioutput (MIMO) control of the barrel temperatures. The dynamic behaviors of melt pressure and barrel temperatures were analyzed first. The characteristics of the melt pressure dynamics were as follows: nonlinear and time-varying while the extruder barrel temperatures were nonlinear, slow response, and different zones were highly coupled. Advanced control algorithms were adopted to control these key variables. Experimental results demonstrate the fast response, near-zero overshoot, and precise tracking performance of the proposed control strategies. The robustness of the entire control system was verified through different operating conditions including materials and set points. Ultimately the performance of the entire control system was verified by product quality. The product quality improved significantly with the proposed controller. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620390 [article] Polymer extrusion : From control system design to product quality [texte imprimé] / Zhijun Jiang, Auteur ; Yi Yang, Auteur ; Shengyong Mo, Auteur . - 2013 . - pp. 14759-14770. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14759-14770 Mots-clés : System  design  Control  system Résumé : As a major polymer processing technique, polymer extrusion is a continuous process, during which material properties, machine variables, and process variables interact with each other to determine the final product quality. Precise control of key process variables such as barrel temperatures and melt pressure are crucial to ensure a good product quality in the extrusion process. In this paper, the overall extruder control system is constructed by two independent control loops, a single-input―single-output (SISO) control of the melt pressure at die output, and a multiinput―multioutput (MIMO) control of the barrel temperatures. The dynamic behaviors of melt pressure and barrel temperatures were analyzed first. The characteristics of the melt pressure dynamics were as follows: nonlinear and time-varying while the extruder barrel temperatures were nonlinear, slow response, and different zones were highly coupled. Advanced control algorithms were adopted to control these key variables. Experimental results demonstrate the fast response, near-zero overshoot, and precise tracking performance of the proposed control strategies. The robustness of the entire control system was verified through different operating conditions including materials and set points. Ultimately the performance of the entire control system was verified by product quality. The product quality improved significantly with the proposed controller. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620390

A two-stage method for identification of dual-rate systems with fast input and very slow output / Shengyong Mo in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1980–1988 Titre : A two-stage method for identification of dual-rate systems with fast input and very slow output Type de document : texte imprimé Auteurs : Shengyong Mo, Auteur ; Xi Chen, Auteur ; Jun Zhao, Auteur Année de publication : 2009 Article en page(s) : pp. 1980–1988 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Dual-rate  system  Finite  impulse  response  Combined  least-squares  criterion  Newton-Raphson  method Résumé : A dual-rate system with fast input and very slow output is very common in the chemical process industry. To identify its original fast single-rate model based on the output error method, a two-stage method combining techniques for dealing with initialization and local minimum problems is proposed in this paper. In its first stage, a finite impulse response (FIR) model is developed directly from the original dual-rate sampled data using the combined least-squares criterion and Newton−Raphson (N−R) method. In the second stage, a single-and-fast-rate output error model is developed on the basis of the original fast input signal and the derived slow rate model output. Besides the simulation examples, the method is also applied to develop a composition observer for an industrial distillation column. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800948g [article] A two-stage method for identification of dual-rate systems with fast input and very slow output [texte imprimé] / Shengyong Mo, Auteur ; Xi Chen, Auteur ; Jun Zhao, Auteur . - 2009 . - pp. 1980–1988. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1980–1988 Mots-clés : Dual-rate  system  Finite  impulse  response  Combined  least-squares  criterion  Newton-Raphson  method Résumé : A dual-rate system with fast input and very slow output is very common in the chemical process industry. To identify its original fast single-rate model based on the output error method, a two-stage method combining techniques for dealing with initialization and local minimum problems is proposed in this paper. In its first stage, a finite impulse response (FIR) model is developed directly from the original dual-rate sampled data using the combined least-squares criterion and Newton−Raphson (N−R) method. In the second stage, a single-and-fast-rate output error model is developed on the basis of the original fast input signal and the derived slow rate model output. Besides the simulation examples, the method is also applied to develop a composition observer for an industrial distillation column. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800948g