Yaw Motion Analysis of Single-Trailer Truck Using Yaw Amplification Factor (YAF)

This study investigates a yaw motion analysis of single trailer-truck using yaw amplification factor (YAF) approach. Unwanted yaw motion in single-trailer truck can cause instability of the truck vehicle and resulting road accident such as knife-jacking. This study focused on applying brake pressure to predict the jack-knife accident. The trailer truck was tested at 100 km/h while applying various brake pressures at 0.5 MPa, 1.0 MPa, 1.5 MPa, 2.0 MPa and 2.5 MPa during single lane change and double lane change using TruckSim software. Yaw Amplification Factor (YAF) was used to analyse the yaw movement in the single-trailer truck. The indicator of yaw amplification factor to predict jack-knifing which is related to unwanted yaw motion of a truck was implemented in this study to the potential accident analysis. This study showed that jack-knife accident happened when travelling at 100 km/h when applying the brake pressures of 1.5 MPa and 2.5 MPa for single lane change manoeuvre. Similarly, jack-knife accident also happened when travelling at 100 km/h for double lane change manoeuvre with brake pressures of 1.5 MPa, 2.0 MPa and 2.5 MPa. These findings are based on C
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indicator to predict jack-knife accident.