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Assessing Reproducibility of Head Restraint Measurements: ACEA Study Results

This document presents the results of the ACEA study on the repeatability and reproducibility of head restraint measurements. The study was conducted in two phases, testing different seats in multiple labs. The measurements investigated include seat position, seat back angle, head restraint stem angle, SAE Manikin position, H point, backset, and head restraint height. The analysis reveals issues of reproducibility and repeatability, with significant differences observed in seat back angle and stem angle. The practical measurements also show variations in backset and height.

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Assessing Reproducibility of Head Restraint Measurements: ACEA Study Results

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  1. Head Restraint IWG Document: HR-1-7 GRSP-Informal Head Restraints GTR OICA presentation 1 February 2005 ABSTRACT fromACEA Whiplash Test Series on Repeatability and Reproducibility of Proposed Test Procedures September 2004 Céline Adalian & Raimondo Sferco

  2. Purpose of the ACEA Study • Test series conducted in two phases • Phase 1: Repeatability testing • 3 different seats used • 3 repeat tests of each seat • All repeat testing conducted at Thatcham • Phase 2: Reproducibility testing • 3 different seats used • Testing conducted in five different labs (using the same test protocol) • One test per configuration

  3. HRMD Setup used • Initial Geometric assessment with HRMD • Seat = mid height / mid rails • HR = mid position if locked or else fully down Sample picture of HRMD measurement

  4. Parameters investigated with respect to test set-up • Initial position of seat • Seat back angle • Head restraint stem angle • Initial position of SAE Manikin + HRMD • H point • Backset and head restraint height

  5. Seat setup as results of HRMD measurementsSeat back and stem angle Points marked with a “+” are from the tests made at Thatcham (repeatability assessment)

  6. HRMD setupHRMD H-point measurement result scatter Points marked with a “+” are from the tests made at Thatcham (repeatability assessment)

  7. HRMD setupHRMD height and backset measurement result scatter Points marked with a “+” are from the tests made at Thatcham (repeatability assessment)

  8. HRMD torso angle vs backset measurement result scatter

  9. Conclusions on HRMD measurements and set-up procedure • Analysis shows that reproducibility and repeatability issues still exists. • The use of the HRMD procedure by the different labs caused seat back angle (stem angle) differences of up to 4 deg. This could be seen as significant. One degree change in the stem angle will lead in theory to 15 mm increase in backset. • In the practical measurement the maximum differences of backset and height for reproducibility were more than 20 mm.

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