抄録
This research is concerned with a device for measuring the differences of pressures between two points, used for investigating ventilation in tunnels. This device is composed of a double-walled container in which the air pressure is kept constant as the reference pressure. In order to obtain the exact constant pressure, the temperature in the container must be controlled to a high accuracy within 10-3°C. In this paper, analytical and experimental studies are developed for the estimate and control of the temperature in the container. First, the parameters of a bilinear control system can be estimated using the least-squares and the correlation-regression algorithms from input-output measurements. Using these parameters, the temperature in the container can be estimated. Nextly, the ambient air temperature influences the accuracy of the temperature in the container. In order to estimate this effect, a feedforward controller can be added to regulate the output of the heater according to atmospheric temperature. The experimental results show the good regulation.
