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Side Slopes Static Stability of Double-Articulated Logging Tractor
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English
Abstract
A detailed analytical study of a wheeled double-articulated skidder is performed. Also experimental verification of the stability analysis is made using a scale model of the vehicle.
The double articulation joint allows both halves to rotate vertically as well as hinge horizontally. Equations locating the centers of gravity of each section of the vehicle are developed for the three basic modes of stability.
The three basic modes of static stability are front section tipping, rear section tipping and the entire vehicle tipping as a unit. The problem is complicated by including the cable winch load on the rear section of the skidder. This load varies in magnitude and direction.
The results are presented as stability curves in terms of hill slope, steering angle, vehicle orientation angle, articulation angle and cable force.
The analytical model and experimental model were in agreement. The skidder static stability was found to be very sensitive to its orientation angle on the hill and its steering angle.
This study provides a good basis for the dynamic study of the double-articulated logging tractor by showing the sensitive parameters which will affect stability.
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Citation
Blankenship, J., Means, K., and Biller, C., "Side Slopes Static Stability of Double-Articulated Logging Tractor," SAE Technical Paper 841140, 1984, https://doi.org/10.4271/841140.Also In
References
- Dix J. C. Design and operational criteria for safe logging skidders Proceedings of Forest Engineering Conference American Society of Agricultural Engineers St. Joseph, Michigan 1968
- Gibson H. G. Articulated-Frame, Four-Wheeled-Drive Tractor Stability Master's Thesis West Virginia University 1969
- Kolman B. Introductory Linear Algebra With Applications Macmillan Publishing Co. New York 1980
- Larson D. Liljedahl J. B. Simulation of Sideways Overturning of Wheel Tractors on Side Slopes Proceedings of National Farm Construction & Industrial Machinery Meeting American Society of Automotive Engineers Milwaukee, Wis. 1971
- Pershing R. L. “Simulating Tractive Performance,” SAE paper # 710525 1971
- Sandor B. I. Engineering Mechanics: Statics and Dynamics Prentice-Hall, Inc. NJ 1983
- Unruh D. H. “Determination of Wheel Loader Static and Dynamic Stability,” Earthmoving Industry Conference Society of Automotive Engineers Peoria, Ill. 1971
- Blankenship J. W. “Side Slope Static Stability of a Double-Articulated Logging Tractor Problem Report West Virginia University 1983
- Grace L. Means K. H. Biller C. J. “A Survey of Tractor Stability Analyses,” ASAE Paper No 83 1618 December 1983