Conference proceeding
Real-time process control techniques for a system with unpredictable disturbances
Advances in instrumentation and control : proceedings of the ISA ... International Conference and Exhibit, Vol.50(1), pp.11-19
01/01/1995
Abstract
The development of a feedback control system to maintain a desired concentration of an aerosol in an environmental chamber is discussed. System components include: a stepper-motor-driven dust generator connected by the serial port to a host computer; and an aerosol monitor connected to an analog-to-digital (A/D) converter in the computer capable of transmitting a voltage signal proportional to concentration. Uncontrolled trials revealed highly correlated concentration levels that exhibited unpredictable disturbances and tended to wander significantly off target. The automatic control system contained an exponentially weighted moving average (EWMA) algorithm, developed for use with correlated data, to both smooth the concentration readings near some average value and create control limits that vary over time. Control action was taken when either limit reached the setpoint by manipulating the dust generator output rate. This approach reduced the number of control actions needed to maintain the process near the setpoint and avoided unnecessary corrections when sudden, but short-lived, disturbances affected the system.
Details
- Title: Subtitle
- Real-time process control techniques for a system with unpredictable disturbances
- Creators
- Patrick T O'Shaughnessy
- Resource Type
- Conference proceeding
- Publication Details
- Advances in instrumentation and control : proceedings of the ISA ... International Conference and Exhibit, Vol.50(1), pp.11-19
- ISSN
- 1054-0032
- Language
- English
- Date published
- 01/01/1995
- Academic Unit
- Occupational and Environmental Health; Civil and Environmental Engineering
- Record Identifier
- 9984214952902771
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