Abstract
Determining the values of ASI (Acceleration Severity Index) and THIV (Theoretical Head Impact Velocity) parameters during tests allows you to assign an appropriate class for a given type of object to determine the safety level and to give the CE marking. The paper presents the methodology for determining these parameters based on the EN 1317-1 and EN 12767 standards. The paper also presents a tool created with the use of the Python programming language, which, based on the results of experimental tests or the results of numerical calculations, allows to determine the ASI and THIV values. The values of key parameters from the point of view of normative tests were calculated based on the results of experimental tests of the road sign supporting mast and numerical analysis carried out for the same case using the Finite Element Method and LS-Dyna software, following the EN 12767 standard.
Highlights
In accordance with World Health Organization, over a million people are being killed due to road accidents every year
Both standards specify safety classes based on vehicle speed reduction and such parameters as Acceleration Severity Index (ASI) and Theoretical Head Impact Velocity (THIV)
The value of Acceleration Severity Index – ASI is determined by the equation (1), wherein the numerators of individual terms of the equation there are components of the vehicle acceleration and in the denominator the corresponding acceleration limits
Summary
In accordance with World Health Organization, over a million people are being killed due to road accidents every year. Nowadays road barriers and passively safe supporting structures fulfil this function [4] For those objects, which constitute road restrictions, it is necessary to carry out crash tests by an accredited body in accordance with the standard appropriate for a given type of object to assign an appropriate safety class. EN 1317 “Road restraint systems” [5] – for road barriers and EN 12767 “Passive safety of support structures for road equipment” [6] – for objects like gantries and support masts Those regulations define the requirements that the tested objects should meet in order to qualify them to the. Both standards specify safety classes based on vehicle speed reduction and such parameters as Acceleration Severity Index (ASI) and Theoretical Head Impact Velocity (THIV). A tool was presented that allows determining the values of these parameters based on both experimental and numerical results
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