/SENSOR/NIC_NIJ

Block Format Keyword Describes the sensors based on Neck Injury Criteria (NIC), which are used to activate or deactivate an object according to the defined characteristics.

This sensor is based on the Neck Injury Criterion Nij, developed by the National Highway Traffic Safety Administration (NHTSA). It uses forces and moments computed in the spring to which it is attached. Tension or compression axial force are combined with flexion or extension bending moment and compared to a given critical value (Nij_max).

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/SENSOR/NIC_NIJ/sens_ID/unit_ID
sens_title
Tdelay
Nij_max Fint_tension Fint_compression Mint_flexion Mint_extension
Spring_ID Skew_ID Axial_dir Bend_dir
Tmin α MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeqySdegaaa@3792@ CFC

Definition

Field Contents SI Unit Example
sens_ID Sensor identifier.

(Integer, maximum 10 digits)
unit_ID (Optional) Unit Identifier.

(Integer, maximum 10 digits)
sens_title Sensor title.

(Character, maximum 100 characters)
Tdelay Time delay.

Default = 0.0 (Real)

 [ s ]
Nij_max Nij limit value.

Default = 1.0 (Real)
Fint_tension Critical axial force in tension.

Default = 6806.0 N (Real)

 [ N ]
Fint_compression Critical axial force in compression.

Default = 6160.0 N (Real)

 [ N ]
Mint_flexion Critical bending moment in flexion.

Default = 310.0 N.m (Real)

 N.m MathType@MTEF@5@5@+= feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr 0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape WaamWaa8aabaWdbiaad6eacaGGUaGaamyBaaGaay5waiaaw2faaaaa @3A91@
Mint_extension Critical bending moment in flexion.

Default = 135.0 N.m (Real)

 N . m MathType@MTEF@5@5@+= feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr 0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape WaamWaa8aabaWdbiaad6eacaGGUaGaamyBaaGaay5waiaaw2faaaaa @3A91@
Spring_ID Spring element identifier. 2

(Integer)
Skew_ID Skew system identifier. 3

Default = Skew system attached to the property of the spring

(Integer)
Axial_dir Direction for axial force monitoring. 4

Default = Z (Text)
Bend_dir Direction for bending moment monitoring. 4

Default = Y (Text)
Tmin Minimum time duration before activation when criteria is reached.

Default = 0.0 (Real)

 [ s ]
α MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeqySdegaaa@3792@ Filter constant. 5

Default = 2.0775 (Real)
CFC Filter Channel Frequency Class. 5

Default = 600 (Real)

 [Hz]

Comments

  1. Neck Injury criterion Nij is computed with:(1)
    N I J =   F z F i n t +   M y M i n t MathType@MTEF@5@5@+= feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr 0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape GaamOta8aadaWgaaWcbaWdbiaadMeacaWGkbaapaqabaGcpeGaeyyp a0JaaiiOamaalaaapaqaa8qacaWGgbWdamaaBaaaleaapeGaamOEaa WdaeqaaaGcbaWdbiaadAeapaWaaSbaaSqaa8qacaWGPbGaamOBaiaa dshaa8aabeaaaaGcpeGaey4kaSIaaiiOamaalaaapaqaa8qacaWGnb WdamaaBaaaleaapeGaamyEaaWdaeqaaaGcbaWdbiaad2eapaWaaSba aSqaa8qacaWGPbGaamOBaiaadshaa8aabeaaaaaaaa@4A1C@
    Where,
    F z MathType@MTEF@5@5@+= feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr 0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape GaamOra8aadaWgaaWcbaWdbiaadQhaa8aabeaaaaa@382D@
    Corresponding axial force.
    M y MathType@MTEF@5@5@+= feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr 0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape Gaamyta8aadaWgaaWcbaWdbiaadMhaa8aabeaaaaa@3833@
    Corresponding bending moment.
  2. Identifier of the spring from which the force and moment will be computed (select the spring corresponding to the upper neck load cell of the Dummy).
  3. Dummy’s spring modeling to the upper neck load cell is supposed to be a TYPE8 spring with a local skew system attached (in the property); this skew is supposed to be orientated according to standardized orientation.
  4. If the spring referred to in the sensor is oriented according to standardized orientation, Axial_dir and Bend_dir do not need to be defined.
  5. F z MathType@MTEF@5@5@+= feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr 0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape GaamOra8aadaWgaaWcbaWdbiaadQhaa8aabeaaaaa@382D@ force and M y MathType@MTEF@5@5@+= feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr 0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape Gaamyta8aadaWgaaWcbaWdbiaadMhaa8aabeaaaaa@3833@ moment used in Equation 1 are filtered according to SAE J211-1, using CFC-600 filter. CFC and α MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeqySdegaaa@3792@ can be adjusted for other CFC filters. Since forward-backward filter is calculated in runtime, its output is delayed by several cycles.
  6. Standardized orientation (SAE J211-1):
    • Positive X-axis is directed from the posterior to the anterior of the dummy
    • Positive Y-axis is directed from the dummy’s left to the dummy’s right
    • Positive Z-axis is directed from superior to interior
  7. This sensor can be used to terminate a simulation at specific conditions with the Engine keyword /STOP/LSENSOR.