TCON 
TEPS 
DAMPT0 
DEPS 
IDUMP 
NOCOLL 


AMuSnag 

18 
Card: Field 
Variable 

Description 
Original Units 
Metric Units 



This card includes additional optional inputs for the SNAG Impulsive Restraint Option. 


18:1 
TCON 

Moment constraint option. For ABS( _{} ) >TEPS, apply equal and opposite moments to each of the vehicles. 
lbin 
Nm 
18:2 
TEPS 

Moment constraint null band. For values of ABS (_{}) < TEPS, apply viscous resistance. 
rad/sec 

18:3 
DAMPT0 

Linear damping option. For velocity of the SNAG point movement greater than DEPS, apply coulomb damping of magnitude DAMPT0. 
lbsec/in

Nsec/cm 
18:4 
DEPS 

Linear damping null band. For values of SNAG point velocity <DEPS, apply viscous resistance.DAMPT0 
in/sec 
cm/sec 
18:5 
IDUMP 

Option for additional DUMP of information related to the SNAG. 


18:6 
NOCOLL 

Coll option. If=1, turn off collision forces (i.e. no calls to subroutine coll) for duration of the SNAG. (This option is useful for situations where two vehicles lock together for a prolonged period of time after the primary collision. Use caution with this option as the collision routine is disabled from TSBEG (Card 18, field 1) until the end of the simulation run.) 


18:7 


Currently not used 


18:8 


Currently not used 


18:9 
AMUsnag 
μsnag_{v} 
Intervehicle SNAG friction force coefficient: During the impulsive constraint this coefficient of friction can be used to model tangential forces between the two vehicle structures when the corresponding adjacent surfaces of V1 and V2 are moving with respect to each other (at a velocity greater than ζ_{V}). The friction force is perpendicular to the SNAG force and it opposes relative motion with a value equal to μsnag_{v} times the SNAG force. If used, this value should normally be set to be equal to or less than AMU (card 13, field 7), the intervehicle friction coefficient. 


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