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Forests 2017, 8(11), 456; https://doi.org/10.3390/f8110456

Incidence of Trailer Frame Structure on Driver’s Safety during Log Transportation

Department of Agricultural, Forest and Food Sciences, University of Torino, Largo Paolo Braccini, 2, 10095 Grugliasco, Italy
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Received: 29 September 2017 / Revised: 9 November 2017 / Accepted: 11 November 2017 / Published: 18 November 2017
(This article belongs to the Special Issue Forest Operations, Engineering and Management)
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Abstract

The frame structure of the trailer may influence both the traction and the tractor-trailer stability, especially along sloped paths. The aim of this research was to analyze a trailer overturning and the strains on the connected tractors (wheeled, or crawled) during log transportation (loose or tied) along a hillside. Two two-axle trailers were used: tandem and turntable steering. Three types of measurements were carried out during the field tests: (i) the detachment from the ground of the rear upstream wheels (or crawler); (ii) the transversal and longitudinal strains occurring when the trailer overturned (and released the hooking system of the tractor); (iii) the lateral deviation of the rear wheels (or crawler) of the tractor. The study highlighted that the two-axle trailer with turntable steering combined with the crawl tractor gave better results in terms of safety during trailer overturning. In addition, independent of the type of trailer, a tied load was found to be more dangerous than a load restrained only by steel struts, because when overturning, the load forms a single unit with the trailer mass which increases the strains. View Full-Text
Keywords: frame structure; two-axle trailer; crawl tractor; wheel tractor; safety frame structure; two-axle trailer; crawl tractor; wheel tractor; safety
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Manzone, M.; Calvo, A. Incidence of Trailer Frame Structure on Driver’s Safety during Log Transportation. Forests 2017, 8, 456.

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