Document Type
Thesis
Date of Award
6-30-1963
Degree Name
Master of Science in Chemical Engineering - (M.S.)
Department
Chemical Engineering
First Advisor
Herbert Dengler
Second Advisor
Jerome J. Salamone
Third Advisor
C. L. Mantell
Abstract
System instability or poor control are problems which occur in commercial automatically controlled liquid level installations. A simple level control system was constructed to define the parameters which affect a level control system response. Special problems which occur in commercial installations were evaluated.
The system parameters were defined. To simplify the mathematical analysis, a negligible measurement and controller time constant were assumed. These were later shown to be reasonable assumptions. Transfer functions were derived for each component and were used to describe the system response. The system response was predicted by transient response analysis and compared with experimental results. An improved technique was used to determine component time constants with the loop open. Smaller component time constants resulted. The process time constant was found to have the greatest affect on system response. The effect of variations of the process time constant on the theoretical system performance was investigated. Large process time constants resulted in poorer control. The control valve operating characteristics were found to be linear.
System stability and response were predicted and experimentally confirmed using the mathematical analysis and techniques described in this work. The mathematical characterization accurately described a simple level control system and is applicable for design purposes in industrial level control.
It is concluded that if the factors which determine the response of a system are characterized properly, it is possible to use the technique for commercial design purposes.
Recommended Citation
Gregoli, Armando Anthony, "Application of transient response analysis to an automatically controlled liquid level system" (1963). Theses. 2786.
https://digitalcommons.njit.edu/theses/2786
