ISO/TR 13330:2013 PDF

Overview

ISO/TR 13330:2013 - Road vehicles - Calculation processes for the neck injury criteria in rear impact - is an informative Technical Report from ISO/TC 22/SC 12 that defines recommended calculation procedures for several neck performance criteria used in low-severity rear impact testing. The report documents standardized processing steps (filtering, offset correction, sign conventions and time windows) for metrics such as upper neck loads, NIC (Neck Injury Criterion), Nij, and other neck criteria reported in the literature. ISO/TR 13330:2013 applies specifically to measurements taken on mid‑size adult male dummies and does not prescribe particular injury criteria or provide injury risk curves.

Key topics and technical requirements

• Scope: Calculation procedures for neck injury metrics in low‑severity rear impact; applies to mid‑size adult male dummies only.
• Data handling: Raw (unfiltered) signals must be used as input; first step is filtering per specified channel filters.
• Filtering & sampling: Normative references dictate filtering channels (examples in the report: head and force channels with CFC 1000, T1 accelerations with CFC 180, upper neck moment with CFC 600).
• Zero offset correction: Remove mean offset calculated over the last 10 ms before impact (for 10 kHz acquisition, last 100 points).
• Reference frame & sign convention: Uses SAE J211-1 reference axes (+X forward, +Y left→right, +Z downward) and explicit polarity checks for Fx, Fy, Fz, Mx, My, Mz.
• Time windows: Maximum/minimum evaluation windows are specified (e.g., NIC evaluated until end of head restraint contact; others use full available time window).
• Computation details: Procedures for computing NIC, Nij (including force/moment decomposition into tension/compression and flexion/extension), moment shift to occipital condyles, and how to combine component contributions.

Applications and users

Practical uses of ISO/TR 13330:2013 include:

• Standardizing post‑processing of crash test data in rear-impact (whiplash) assessments.
• Supporting development and validation of vehicle head restraints, seat designs, and occupant protection systems.
• Ensuring comparability of neck criterion calculations between laboratories and test programs.

Primary users:

• Automotive safety engineers and crash test laboratories
• Biomechanics researchers studying whiplash mechanisms
• Dummy and sensor manufacturers implementing measurement systems
• Regulators and standards bodies assessing test methods

Related standards

• ISO 6487 - Measurement techniques in impact tests - Instrumentation (normative reference for filtering/measurement).
• SAE J211-1:2003 - Instrumentation for Impact Tests - Part 1: Electronic Instrumentation (reference for reference frame and sign conventions).

Keywords: ISO/TR 13330:2013, neck injury criteria, rear impact, whiplash, NIC, Nij, upper neck loads, crash test, head restraint, vehicle safety.