The effects on vehicle motions of responses of undamaged steering systems to external forces can be significant during spinout motions. This option has been added to permit the inclusion of those effects on the vehicle trajectory. The inputs are on Cards 25 and 26.
M-edit includes the provision to include the effects of a steer degree-of-freedom (SDOF) steering system during a simulation run. The steer degree-of-freedom was included to model the effects of an undamaged steering system during spinout subsequent to a collision. The model is similar to the SDOF included in the Highway Vehicle Object Simulation Model (HVOSM) program (e.g., Ref. 15).
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XIPS1 |
CPSP1 |
OMGPS1 |
AKPS1 |
EPSPS1 |
XPS1 |
PSIF1 |
PSIFD1 |
TSDOF1 |
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25 |
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Card: Field |
Variable |
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Description |
Original Units |
Metric Units | ||||||||||||
25:1 |
XIPS1 |
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Vehicle #1 Steer degree-of-freedom Option Inputs Steering system moment of inertia about the wheel steering axes. (range approx. 200-1000 lb-sec-in) |
lb-sec-in |
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CPSP1 |
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Steering system coulomb friction torque, effective at the wheel steering axes. (range approx. 500-2000 lb-in) |
lb.-in |
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25:3 |
OMGPS1 |
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Front wheel steer angle at which steering limit stops are engaged. (range approx. 20-30 degrees) |
Degrees |
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25:4 |
AKPS1 |
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Stiffness of the steering limit stops, effective at the front wheel steering axes. (range approx. 50,000-100,000 lb-in/rad). |
lb-in/rad |
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EPSPS1 |
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Friction lag in the steering system. (range approx. 2-17 deg/sec) |
Deg/sec |
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XPS1 |
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Front wheel pneumatic trail. (range approx. 0.50-1.50) |
inches |
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25:7 |
PSIF1 |
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Initial steer angle used if TSDOF1 = 0.0. |
degrees |
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25:8 |
PSIFD1 |
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Initial steering system velocity, used if TSDOF1 = 0.0. |
deg/sec |
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25:9 |
TSDOF1 |
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Start time for steer-degree of freedom. |
seconds |
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