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Technical Paper

Computer-Based Analysis of the Dynamic Performance of Log Hauling Trucks

1995-11-01
952637
A yaw/roll simulation model is developed to assess the dynamic performance of 5, 6, 7, and 8-axle logging truck configurations in this paper. Results predicted by the yaw/roll models for a 5-axle tractor/pole trailer (with outriggers) and a 6-axle tractor/jeep/pole trailer (with outriggers) are compared with those measured in field tests for purposes of model validation. Good agreement between the simulations and measurements has been obtained. Certain performance measures for the tested tractor/pole trailer and tractor/jeep/pole trailer, such as Rearward Amplification Ratio, Load Transfer Ratio, Transient High-speed Offtracking, Understeer Coefficient, Static Rollover Threshold, and Low-speed Friction Demand, are examined by using the yaw/roll models.
Technical Paper

A Computer Simulation Analysis of Road Dynamics of Log Hauling Trucks

1994-11-01
942305
A nonlinear yaw-roll model for log hauling trucks is developed in this paper. Several nonlinear effects, such as nonlinear tire cornering forces, nonlinear tire aligning moments, and the coupling between the yaw and roll motions, are considered in this model. Using this model, a computer simulation of the directional and roll responses of a logging truck with tractor and pole-trailer configurations is carried out through various maneuvers. Simulated results for the lateral accelerations are compared with those obtained from field tests. Good agreement has been achieved.
Technical Paper

Handling Performance and Lateral Stability of Articulated Logging Trucks

1998-11-16
982786
The present state of knowledge on the handling behavior of articulated combination trucks is based on parametric studies made through truck model simulations. A detailed yaw-lurch planar mathematical model for articulated log-hauling combination doglogger trucks is developed in this study. Further, a thorough kinematic and dynamic analyses of log-hauling combination trucks, incorporating a sliding drawbar is carried out and the governing equations for the lateral and yaw planar motions are derived. Using a computer simulation model, the directional performance and the yaw and lateral stability of these articulated vehicles are fully investigated through a transient and harmonic response analyses. Finally, a parameter sensitivity analysis was carried out for different variables involved in the simulation model, to study the sensitivity of the steady-state response to various parameters.
Technical Paper

The Directional Response of Log Hauling Truck - Doglogger

1992-11-01
922427
A planar mathematical model for various design configurations of the doglogger truck, the tractor triaxle trailer combination and the tractor quadaxle trailer combination is developed. A kinematic and dynamic analysis of this vehicle model is then carried out and the governing equations for planar yaw motions are derived. Using the computer simulation model, dynamic responses of the vehicle are investigated through transient and harmonic response calculations, and a parametric sensitivity study is carried out.
Technical Paper

Directional Stability Analysis of Logging Trucks by a Yaw Roll Model

1993-11-01
932946
A yaw roll model is proposed for investigating the effect of roll motion and suspension on the lateral dynamic behaviour of various design configurations of log hauling trucks. A detailed kinematic and dynamic analysis of this model for the truck tandem axle pole trailer combinations is carried out, and the corresponding equations of motion are established. The directional response and roll response under step and sinusoidal steer maneuvers are investigated numerically. The results obtained show that the suspension and roll motion have a significant effect on the final steady state motion in the lateral direction.
Technical Paper

Directional Response and Yaw Stability of Articulated Log Hauling Trucks

2000-12-04
2000-01-3478
The planar mathematical model for various design configurations of articulated log-hauling truck in the form of a tandem axle tractor and two separate semi-trailer units, commonly known as super B train truck, is developed. A thorough kinematics and dynamic analyses of the log-hauling combination trucks, incorporating up to three axles to be steerable for the tractor, are carried out and the governing differential equations for the lateral and yaw planar motions are derived. Using a computer simulation model, the directional performance and the lateral and yaw and stability of this articulated truck is fully investigated through transient and harmonic response analyses. Finally, a parameter sensitivity analysis was carried out for different variables involved in the simulation model, to study the sensitivity of the steady-state response to various parameters.
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