Crash Analysis (NIJ)

Download PDF

Updated2024-09-12
3 minute(s) read

Use this dialog box to calculate the Normalized Neck Injury Criterion value (NIJ) according to FMVSS.

Settings

Time channel	Specifies the data channel containing the time values of the signal in seconds. The values of the data channel must be monotonic increasing.
Force Fz	Specifies the data channel containing the values of the axial force in the z-direction at the point where the head intersects with the neck, in Newton.
Moment My	Specifies the data channel containing the values of the bending moment (total moment) in the y-direction at the top of the neck, in newton meters.
NTF	Specifies whether DIAdem executes the Nij calculation after NTF.
Critical compression force Fzc [N]	Specifies the critical compression force in newton for NTF.
Critical bending moment Myc [Nm]	Specifies the critical bending moment in newton meters for NTF.
NTE	Specifies whether DIAdem executes the Nij calculation after NTE.
Critical compression force Fzc [N]	Specifies the critical compression force in newton for NTE.
Critical bending moment Myc [Nm]	Specifies the critical bending moment in newton meters for NTE.
NCE	Specifies whether DIAdem executes the Nij calculation after NTE.
Critical compression force Fzc [N]	Specifies the critical compression force in newton for NCE.
Critical bending moment Myc [Nm]	Specifies the critical bending moment in newton meters for NCE.
NCF	Specifies whether DIAdem executes the Nij calculation after NCF.
Critical compression force Fzc [N]	Specifies the critical compression force in newton for NCF.
Critical bending moment Myc [Nm]	Specifies the critical bending moment in newton meters for NCF.

	Note The NijVersion variable receives the algorithm version number, which is independent of the DIAdem version number.
	Refer to the description of the NIJ criterion for further information such as mathematical background, input values, and directives and laws.

If you want to use waveform channels in this dialog box, follow Rules 2.2 and 2.3 for Calculating with Waveform Channels.

Result

DIAdem generates a result channel that contains the values of the NIJ analysis curve.

NijMax	Receives the maximum value of the NIJ calculation.
NijTime	Receives the time value for the maximum value.
NijType	Receives the calculation type.

Note DIAdem saves the calculation results and the version number of the algorithm which is not the same as the DIAdem version number in the following custom properties of the result channel: Result~Nij~Max, Result~Nij~Time, Result~Nij~Type, and Result~Nij~Version.

To calculate quantity-based in DIAdem, click the Calculate Quantity-Based button on the DIAdem ANALYSIS toolbar. When executing quantity-based calculations, DIAdem checks whether the program can also execute calculations on physical quantities in the same calculation. If DIAdem cannot execute the calculation because the physical quantities are unsuitable, the program displays an error message. Refer to the Help page Calculating Quantity-Based and Non-Quantity-Based in DIAdem for the conditions and rules for quantity-based calculations.