Kinetic Energy Non-Lethal Weapons Testing Methodology – BTTR Impact Force Model Development


  1. Anctil, B.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN);Biokinetics and Associates Ltd, Ottawa ONT (CAN)
The Blunt Trauma Torso Rig (BTTR) consists of a flexible membrane tuned to match the human chest response. A sensor located behind the point of impact measures the dynamic deflection caused by the deformation of body armours or kinetic energy non-lethal weapon (KENLW) impacts. The deflection data is used to predict the associated risk of injury. A mathematical model, based on the undamped single degree of freedom system, was developed to complement the functionality of the BTTR by allowing calculation of the projectile impact force from the dynamic membrane deflection data. A series of experimental trials with instrumented and non-instrumented projectiles was conducted to estimate the model parameters. Despite good correlation between the measured excitation (projectile force impulse) and the system response (membrane deflection), the model predicted force impulse was always lower than the measured excitation and dependant of the projectile characteristics. The undamped single degree of freedom system was not found appropriate for the BTTR. System identification techniques should be considered in future attempts to build a more sophisticated dynamic system to represent the BTTR.
Blunt Trauma;NLW;Kinetic Energy NLW;Thoracic;Instrumentation;Laser Displacement Transducer;Impact force
Report Number
DRDC-RDDC-2016-C332 — Contract Report
Date of publication
01 Mar 2013
Number of Pages
Electronic Document(PDF)

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