PFD Modelling, Testing and Hydrodynamic Drag Measurement
1. Simulation of PFD Dynamics
GESAC has developed DynPFDSim software to simulate the dynamics of a person wearing a PFD. The software is a graphically driven, PC based simulation software which allows the user to choose the anthropometry of the PFD wearer. Size and buoyancy of the PFD can also be defined as can the speed of water and wave height. The simulation model also calculates loss of heat from the body which can lead to hypothermia. Heat loss from the head is estimated based on experiments conducted at the University of Calgary.
Turn testing of PFDs can be performed in our test tank which is approximately 20' long, 8.5' wide and 7' deep. Please click on the video on the left to observe a video record of a turn test on a 3 year old child wearing a PFD.
3. Hydrodynamic Drag Measurement
Our test tank and associated equipment can be used to measure hydrodynamic drag on various parts such as dummy segments at varying speeds. The parts are moved in water at speeds chosen by the user and drag forces are recorded. Picture on the left shows the 5th percentile female flotation Manikin torso mounted on a frame prior to insertion in water for measurement of drag.