System Dynamics and Control

The natural and man-made world is a spectrum of time constants and linear and non-linear behaviours. Stacey Agnew has the ability to look at system dynamics and control from field measurements and calibration to complex mathematical models. We can also address systems with random behaviour in some features (stochastic systems) as well as those whose behaviour is completely repeatable (deterministic systems). Successes have ranged from sizing underground ore bins, to elastic instability in a high pressure gas valve, to retro-designing for stable air pollution control in the M5East road tunnel.

Road tunnel ventilation control involves an understanding of the complex interactions between traffic, air flow and resulting pollution levels. Accurate and timely adjustment of ventilation fans is required to meet the contractually specified in-tunnel pollution levels and portal air flows. It is also key to minimising electrical power consumption and simplifying operations for control room staff.

During tunnel fire emergencies, accurate control of jet fan thrust is required to contain and direct the spread of smoke whilst simultaneously limiting its mixing with tunnel air. The ability to develop fan control strategies which maximise egress time requires an understanding of the interaction of fire and airflow dynamics.

The same engineering science has been applied by Stacey Agnew to ventilation of other underground and enclosed industrial spaces; including; rail tunnels, cable tunnels used for electrical power distribution, conveyor tunnels used for coal transportation, and storage sheds for iron ore and zinc concentrate.