*AIRBAG_SIMPLE_AIRBAG_MODEL

LS-DYNA Input Interface KeywordThis model defines a one-chambered airbag with uniform pressure method, injected gas and vent hole.

Format

(1) (2) (3) (4) (5) (6) (7) (8)
*AIRBAG_SIMPLE_AIRBAG_MODEL_{OPTION}
If OPTION = ID, insert the following line.
(1) (2) (3) (4) (5) (6) (7) (8)
monvol_ID Title
(1) (2) (3) (4) (5) (6) (7) (8)
surf_IDex Surf_typ            
CV CP T fct_IDM MU AREA Pext ρ
fct_IDp Text Cpa Cpb MW GASC    

Definition

Field Contents SI Unit Example
monvol_ID Airbag identifier.

(Integer)
Title Title.

(character)
surf_IDex Airbag external surface identifier.

(Integer)
Surf_typ Set type.
= 0 Default
The surf_IDex is a segment.
≠ 0
The surf_IDex is a set of parts.

(Integer)
CV Heat capacity at constant volume.

(Real)

 [ J kg⋅K ] MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeaaciGaaiaabeqaamaabaabaaGcbaWaamWaaeaada WcaaqaaiaabQeaaeaacaqGRbGaae4zaiabgwSixlaabUeaaaaacaGL BbGaayzxaaaaaa@3DB3@
CP Heat capacity at constant pressure.

(Real)

 [ J kg⋅K ] MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeaaciGaaiaabeqaamaabaabaaGcbaWaamWaaeaada WcaaqaaiaabQeaaeaacaqGRbGaae4zaiabgwSixlaabUeaaaaacaGL BbGaayzxaaaaaa@3DB3@
T Input gas temperature.

(Real)

 [ K ]
fct_IDM Mass flow rate of injected gas versus time function identifier.

(Integer)
MU Vent hole shape.
< 0
Function identifier of shape factor versus absolute pressure.

Default = 1 (Real)
Area Vent hole area.
< 0
Area.
> 0
Function identifier of area versus absolute pressure.

(Real)

 [ mm 2 ] MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaamWaaeaaca qGTbGaaeyBamaaCaaaleqabaGaaeOmaaaaaOGaay5waiaaw2faaaaa @3AB5@
Pext External pressure.

(Real)

 [ Pa ]
ρ Ambient density (used if CV=0).

Default = P e x t ⋅ M W T e x t ⋅ G A C S MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqGqFfpeea0xe9vq=Jb9 vqpeea0xd9q8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr 0=vr0db8meaabaqaciGacaGaaeqabaWaaeaaeaaakeaadaWcaaqaai aadcfacaWGLbGaamiEaiaadshacqGHflY1caWGnbGaam4vaaqaaiaa dsfacaWGLbGaamiEaiaadshacqGHflY1caWGhbGaamyqaiaadoeaca WGtbaaaaaa@485A@ (Real)

 [ kg m 3 ]
fct_IDp Vent hole mass flow out function versus absolute pressure (used if CV=0).

(Integer)

  
Text External temperature.

Default = 295 K (Real)

 [ K ]
Cpa First heat capacity coefficient of injected gas (used if CV=0).

(Real)

 [ J mole .K ] MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaamWaaeaada WcaaqaaiaabQeaaeaacaqGTbGaae4BaiaabYgacaqGLbGaaeOlaiaa bUeaaaaacaGLBbGaayzxaaaaaa@3DFE@
Cpb First heat capacity coefficient of injected gas (used if CV=0).

(Real)

 [ J m o l e ⋅ K 2 ] MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeaaciGaaiaabeqaamaabaabaaGcbaWaamWaaeaada WcaaqaaiaadQeaaeaacaWGTbGaam4BaiaadYgacaWGLbGaeyyXICTa am4samaaCaaaleqabaGaaGOmaaaaaaaakiaawUfacaGLDbaaaaa@4093@
MW Molecular weight of gas(used if CV=0).

(Real > 0)

 [ k g m o l e ] MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeaaciGaaiaabeqaamaabaabaaGcbaWaamWaaeaada WcaaqaaiaadUgacaWGNbaabaGaamyBaiaad+gacaWGSbGaamyzaaaa aiaawUfacaGLDbaaaaa@3D93@
GASC Universal gas constant 8.314 J mole .K MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaaGioaiaac6 cacaaIZaGaaGymaiaaisdadaWcaaqaaiaabQeaaeaacaqGTbGaae4B aiaabYgacaqGLbGaaeOlaiaabUeaaaaaaa@3FB6@ (used if CV=0).

(Real)

 [ J mole .K ] MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaamWaaeaada WcaaqaaiaabQeaaeaacaqGTbGaae4BaiaabYgacaqGLbGaaeOlaiaa bUeaaaaacaGLBbGaayzxaaaaaa@3DFE@

Comments

  1. This keyword maps to /MONVOL/AIRBAG1, /MAT/GAS, and /PROP/INJECT1.
  2. Vent option defined with function fct_IDp can be used only if CV = 0.