## Card 2 - Initial Conditions – Veh1

 YCP10 PSI10 PSI1DO U10 V10 JTTO(1) AANGLE1 THETD1 2

 Card:  Field Variable Description Original Units Default Units Metric Units 2:1 XCP10 X’c10 The X' coordinate of the center of gravity of vehicle 1, (V1). The smaller vehicle or the bullet vehicle should  be entered as V1. Collision forces are calculated in a clockwise sweep of V1. The force calculations are less accurate in the vicinity of a narrow intrusion; therefore, accuracy is improved when V1 is the smaller vehicle.  A fixed Cartesian coordinate system is used, with the positive X' axis shown pointing upward, and the positive Y' axis to the right. Angles are measured clockwise from the positive X' axis. inches feet meters 2:2 YCP10 Y’c10 The Y'-coordinate of the center of mass of V1. (see comments on XCP10). inches feet meters 2:3 PSI10 ψ10 The heading angle of V1 measured clockwise from the positive X' axis. degrees 2:4 PSI1DO The angular velocity of V1. Taken to be positive when rotation is clockwise. deg/sec 2:5 U10 U10 The initial forward velocity of V1. The longitudinal component of the total vector velocity of V1. in/sec MPH m/sec 2:6 V10 V10 The initial sideways (lateral) velocity of V1 with right taken as positive. in/sec MPH m/sec 2:7 JTTO(1) Trailer option indicator. Set = 1.0 for trailer on veh#1;  = 0 if no trailer. Note:  a m-smac run with only 1 vehicle exercising the Trailer option must be with vehicle#1. Please note that m-smac input cards 20 & 22 are required for a trailer on vehicle #1. 2:8 AAngle1 θ10-ψ10 Initial trailer articulation angle with respect to tractor x axis. Note: AAngle1 = THET1=PSI1 degrees 2:9 THETD1 Initial trailer angular velocity. Taken to be positive when rotation is clockwise. deg/sec

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Card 3 -Initial Conditions: Veh2