The following example demonstrates the input format for the steer degree-of-freedom (SDOF) option. In this example, it is assumed that the impact, which occurs at 0.50 seconds, does not produce any steering system limiting damage and that neither driver applies any steering control.
228. 600. 29.00 50000. 5.000 1.20 0.5 25
228. 600. 29.00 50000. 5.000 1.20 0.5 26
An echo of the SDOF inputs used is as follows:
S T E E R I N G S Y S T E M
MOMENT OF INERTIA XIPS = 228.000 228.000 LB-SEC**2
COULOMB FRICTION TORQUE CPSP = 600.000 600.000 LB-IN
FRICTION LAG EPSP = 5.000 5.000 DEG/SEC
ANGULAR STOP RATE AKPS = 50000.000 50000.000 LB-IN/RAD
ANGULAR STOP POSITION OMGPS = 29.000 29.000 DEGREES
PNEUMATIC TRAIL XPS = 1.200 1.200 INCHES
STEER DEGREE-OF-FREEDOM OPTION CONTROL INPUTS:
START TIME OF SDOF TSDOF = 0.500 0.500 SEC
INITIAL STEER ANGLE PSIF = .000 .000 DEG
INITIAL STEER VELOCITY PSIFD = .000 .000 DEG/SEC
(NOTE:PSIF,PSIFD NOT USED IF TSDOF > 0.0 SEC)
The inputs for the steering system properties were derived from published measurements made for the HVOSM steer degree-of-freedom model by Griffith, et, all as part of a follow up study of the HVOSM curb impact option (see Ref. 15). The m-smac SDOF model is based on the HVOSM SDOF model.
Please note that the suggested values and ranges should be used as starting values. Some applications which use the SDOF may require values that are outside the suggested ranges.