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  • 1
    Electronic Resource
    Electronic Resource
    Model Predictive Time-Optimal Control of Second-Order Processes (1970)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 9 (1970), S. 494-502 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i260036a002
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Least Squares Fitting of Unsteady Process Models Using an On-Line Digital Computer (1972)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 11 (1972), S. 203-212 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i260042a010
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    On-Line Identification of Process Dynamics. A Multi-Frequency Response Method (1975)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 14 (1975), S. 359-368 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i260056a002
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear adaptive optimization of biomass productivity in continuous bioreactors (1991)
    Springer
    Bioprocess and biosystems engineering 7 (1991), S. 101-114 
    Details
    ISSN: 1432-0797
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A novel on-line adaptive optimization algorithm is developed and applied to continuous biological reactors. The algorithm makes use of a simple nonlinear estimation model that relates either the cell-mass productivity or the cell-mass concentration to the dilution rate. On-line estimation is used to recursively identify the parameters in the nonlinear process model and to periodically calculate and steer the bioreactor to the dilution rate that yields optimum cell-mass productivity. Thus, the algorithm does not require an accurate process model, locates the optimum dilution rate online, and maintains the bioreactors at this optimum condition at all times. The features of the proposed new algorithm are compared with those of other adaptive optimization techniques presented in the literature [1–5]. A detailed simulation study using three different microbial system models [3, 6–7] was conducted to illustrate the performance of the optimization algorithm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369421
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Pole-placement self-tuning control of a fixed-bed autothermal reactor. Part II: Multivariable control (1986)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 32 (1986), S. 1015-1024 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The multiinput/multioutput pole-placement self-tuning controller (MIMO PPSTC) previously developed by McDermott and Mellichamp is used to control a fixed-bed autothermal reactor with internal countercurrent heat exchange. The performance of the controller is demonstrated using step changes in the set points and in the primary disturbance variables. It is shown that the complete temperature profile can be maintained by controlling two temperatures in the catalyst bed: one just before the hot spot and the other at the exit of the bed. Simulated results using a 36th-order nonlinear reactor model operating at both an open-loop upper stable steady state and an open-loop unstable steady state are presented. Experimental results for a fixed-bed autothermal reactor operating at an upper stable state are presented.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690320611
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    A scaling procedure for the structural and interaction analysis of dynamic models (1987)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 33 (1987), S. 250-257 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Many techniques that are used for analyzing the structure of large-scale, interactive systems (including the structural dominance analysis and singular-value decomposition methods) require a careful scaling of input and output variables to yield useful results. A suitable scaling procedure motivated by physical arguments and aimed at expressing input and output variables in common terms is presented and illustrated through several examples, including nonlinear lumped-parameter and distributed-parameter models.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690330211
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  • 7
    Electronic Resource
    Electronic Resource
    Controller tuning using optimization to meet multiple closed-loop criteria (1985)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 31 (1985), S. 484-487 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690310317
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Identification and adaptation in control loops with time varying gain (1966)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 12 (1966), S. 83-89 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A method is presented to apply the gain identification procedures developed in a companion paper to a control system. The method employs a small identification tank which follows the control tank; the identification tank is perturbed to estimate the gain of the process (controlled tank system). The effects of load changes on the identification system are minimized by this approach.The results of analog and digital computer simulations of this adaptive process are given. Both a general system with linear change in gain and a pH control system with a step change in concentration of the buffer species are studied. Process gain changes up to 20:1 are introduced.It is concluded that an adaptive control system of this type can be designed to maintain good control characteristics in a process experiencing wide gain variation. Criteria are presented to aid in the design of an adequate identifier.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690120117
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  • 9
    Electronic Resource
    Electronic Resource
    Characterization and gain identification of time varying flow processes (1966)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 12 (1966), S. 75-82 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A method for continuously estimating the gain of a flow process by sinusoidal perturbation is presented. The resulting output perturbation is correlated with a second sinusoid to generate periodically an estimate of the process gain. A method of implementing such an identifier on a small analog computer is described.The experimental testing of this identifier computer with both a real process (a pH regulating system) and with an analog computer simulation of the process is described. The results of identification tests with a nonstationary system are presented. From these results it is concluded that the identifier estimates the process gain satisfactorily, introducing a delay (equal to one-half the period of identification) and making an effective sampling or clamping of the gain estimate (over each period of identification).
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690120116
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Pole-placement self-tuning control of a fixed-bed autothermal reactor. Part I: Single variable control (1986)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 32 (1986), S. 1004-1014 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A pole-placement self-tuning controller has been used to control a fixed-bed autothermal reactor conducting the water-gas shift reaction at both an upper stable state and a middle unstable state. Excellent set-point tracking and disturbance rejection characteristics were obtained using a single manipulated variable, the heat input at the entrance to the catalyst bed, to control a single bed temperature. Excellent set-point tracking during the transition from the upper state to the middle state was obtained by using a technique that tuned the closed-loop poles on-line so as to give an optimal response.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690320610
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    Paper (German National Licenses)
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