Slide 1 Flex PLI Inverse Test Setup - Moving Ram Friction Dirk-Uwe Gehring BGS Böhme & Gehring GmbH 5 th Meeting of the IG GTR9-PH2 Bergisch Gladbach,

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Presentation transcript:

Slide 1 Flex PLI Inverse Test Setup - Moving Ram Friction Dirk-Uwe Gehring BGS Böhme & Gehring GmbH 5 th Meeting of the IG GTR9-PH2 Bergisch Gladbach, Germany, December 2012 GTR9-5-25

Slide 2 Background ●Document GTR9-4-11e.pdf: Concept Tech, Austria: Investigation of the Influences of Friction within the Inverse Certification Test Setup of the FlexPLI. ●Action item from 4th meeting of IG GTR9-PH2: Measure the friction at the test stands and/or provide comments to the Concept document GTR9-5-25

Slide 3 Issue Analysis ●Friction at guiding rails can influence the test results in two ways: 1.If there is a distance between the velocity measurement position and the impact position the friction may reduce the velocity of the ram impactor so that it will hit the legform with a lower velocity as intended. 2.The friction could theoretically initiate a deceleration of the ram impactor and a lower energy input to the legform after the impact. GTR9-5-25

Slide 4 BASt Facility ●Answers : 1.Distance between the velocity measurement position and the impact position is approx. 0 mm. No possibility of an influence of friction before the impact. 2.BASt uses heavy duty roller bearings for the guiding system. The rollers minimize the friction even during the impact phase. GTR9-5-25

Slide 5 Actions Measurement of friction: ●Measurement with spring balance ●The friction force measured is approx. 2.5 N (!) Review of certification data: ●Maximum values occur up to ca. 20 ms, i.e. any effect occuring after 20 ms is irrelevant ●Influence and relevance of friction within 20 ms is unclear, but assumed to be negligible due to the short time GTR9-5-25

Slide 6 Certification Data - Example GTR9-5-25

Slide 7 Conclusions ●Speed measurement should be taken immediately before impact (distance approx. 0 mm) to avoid any influence of friction or any other speed influencing factor before impact. ●In case of smooth-running bearings there seems to be no need to set any additional requirements on the friction GTR9-5-25

Slide 8 Thank you! Dirk-Uwe Gehring BGS Böhme & Gehring GmbH GTR9-5-25