Hot Fire Training Simulators

Aircraft Hot Fire Training Simulators
ACA have undertaken both structural and thermal analysis of aircraft hot fire training simulators which have been installed at airports around the world.
Airports are some of the busiest places on earth. With hundreds of aeroplanes flying in and out of the larger airports everyday, if there was an accident, the potential for loss of life is tremendous.
One of the biggest risks to any airport is fire and since the first airports were developed there has always been a need for efficient fire fighting techniques and equipment.
In recent years, with airports getting larger and busier and there being an increasing risk of terrorist attacks, this need has become more pressing.
Airports can never eliminate the risk of fire and for fire crews and staff to be as efficient as possible in such an emergency they need to practice.
However, burning up a million pound aircraft every so often is not a viable option - even for the largest of companies.
The solution - full size mock-ups of several types of aircraft that are realistic enough to provide the right training, but are also much cheaper to produce and crucially - reusable.
ACA provide the analyses of fire training simulators for KiddeFT - Kidde Fire Trainers for whom we also produce models of proposed simulators, created in 3D AutoCAD and rendered in 3D Studio Max (below)

Stages of Analysis

Outlined below is a typical example of the structural analysis of a hot-fire training simulator. The sequence outlines the method of analysis used, from generating the structural model to deriving the stress and deflexion results. For simplicity only the steps taken in analysing the fuselage section are shown.
1) The model of the fuselage is generated using a combination of beam and shell elements.

2) The loads are then applied to the structural model (here an internal flash-over roof fire gives rise to a thermal load on the upper surface of the fuelage shell).
3) From this model a superelement model is generated, which enables the correct connectivity to adjacent elements to be effected. The analysis is non-linear in that uni-directional movement of the base of the main fuselage supports is permitted, to achieve a degree of thermal expansion.
4) Once the overall model is solved for all load cases (i.e. all environmental and thermal loads) the results for the superelement are expanded back to the original model. Here the stresses caused by the flash-over fire are shown.
5) Finally the deflexion results are obtained for this loading.(Deflexion exaggerated in display)
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