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3ms Acceleration Clip

Overview​

The 3ms chest acceleration clip is a filtered peak acceleration value used in the Combined Thoracic Injury (CTI) calculation. It represents the highest chest acceleration sustained over a 3-millisecond interval, helping quantify the severity of thoracic loading during impact.

Inputs​

Signals:​

  • Resultant Chest Acceleration (G's)

Calculation​

Calculation from SAE 1727 [1],

  1. Filter chest accelerations (CFC = 180)
  2. Linear interpolate to a time step that is a multiple of the time window

-- Single peak and cumulative peak 2. Calculate the longest sustained acceleration over 3ms

Chest_3ms_SingleChest_3ms_Cumulative
3ms Clip Example for Single Peak
3ms Clip Example for Cumulative

Chest_Displacement_Measureing_Sites

Chest Deflection Measurement Sites [1]

Injury Criteria [2] [3]​

ATDChest 3ms Clip Limit (g)
HIII - M5060
HIII - F0560
HII - 10yo60
HIII - 6yo60
HIII - 3yo60
CRABI - 12mo60

References​

[1] "Calculation Guideline for Impact Testing" No. J1727-2015-02 SAE International. SAE Technical Report, 2015.

[2] National Highway Traffic Safety Administration. (2000). Federal Motor Vehicle Safety Standards; Occupant Crash Protection; Final Rule. Federal Register, 65(208), 67691–67703.

[3] National Highway Traffic Safety Administration, “49 CFR §571.213b: Child Restraint Systems,” Electronic Code of Federal Regulations.