SWERISK transferprojekt – slutrapport

During 2011-2013 FOI has developed the computer model SWERISK - on behalf of the Swedish Armed Forces [1]. The development of SWERISK started in 2007 with the goal to create an easy to use computer program for the calculation of risk distances in EOD and demining operations. FOI got a commission from SWEDEC (Swedish EOD and Demining Centre) for this work. It is intended to be a fast instrument to support the crucial task of determining how large an area must be sealed off to minimize the risk to own troops and civilians. The most basic functionality of SWERISK is the calculation of risk distances according to several widespread simple empirical rules based on warhead weight (UN), explosive weight (NATO) or diameter (NL). However, these simple rules do not indicate what injury severity corresponds to the calculated risk distances, nor do they give any information about the risk distances in different directions; in fact, the orientation of the warhead and the characteristics of the surrounding terrain influence the risk area. Therefore, SWERISK also calculates probability of injury for different injury severities as a function of target position relatively to the detonation point. These calculations are based on warhead construction, fragment ballistics and human vulnerability. During this project the program has evolved from only including one-dimensional medium risk distances to producing a two dimensional map of the injury probability, taking into account the terrain and height variations around the detonation point. Furthermore, the object can have an arbitrary position, orientation and speed.