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Risk of Hearing Loss Injury Caused by Multiple Flash Bangs on a Crowd

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Document pages: 27 pages

Abstract: A flash bang is a non-lethal explosive device that delivers intensely loud bangsand bright lights to suppress potentially dangerous targets. It is usually used incrowd control, hostage rescue and numerous other missions. We construct amodel for assessing quantitatively the risk of hearing loss injury caused bymultiple flash bangs. The model provides a computational framework for incorporatingthe effects of the key factors defining the situation and for testingvarious sub-models for these factors. The proposed model includes 1) uncertaintyin the burst point of flash bang mortar, 2) randomness in the dispersionof multiple submunitions after the flash bang mortar burst, 3) decay of acousticimpulse from a single submunition to an individual subject along theground surface, 4) the effective combined sound exposure level on an individualsubject caused by multiple submunitions at various distances from thesubject, and 5) randomness in the spatial distribution of subjects in the crowd.With the mathematical model formulated, we seek to characterize the overalleffect of flash bang mortar in the form of an effective injury area. We carryout simulations to study the effects of uncertainty and randomness on the riskof hearing loss injury of the crowd. The proposed framework serves as astarting point for a comprehensive assessment of hearing loss injury risk, takinginto consideration all realistic and relevant features of flash bang mortar.It also provides a platform for testing and updating component models.

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