Automotive

Terramechanics and Off-Road Vehicle Engineering, Second by J.Y. Wong

By J.Y. Wong

This e-book may be of significant curiosity to any specialist engineer or car engineering pupil engaged on off-road cars. Reflecting the rise in off-road car creation and development-recreational, agricultural, building, military-this e-book equips readers with the entire precious wisdom to effectively layout and version off-road car platforms, and gives a complete creation to terramechanics, the mechanics of vehicle/terrain interplay. the one booklet to hide the rules of off-road motor vehicle and terrain engineering, a swiftly constructing zone that comes with SUVs, tractors and agricultural cars, army cars, and development equipmentCovers the newest advancements within the box, together with the most recent computer-aided tools hired within the improvement of latest iteration of high-mobility off-road cars in Europe, North the US and Asia.Ideal for pro reference and path reference by means of scholars, with new particular labored layout examples, case reports, and accompanying difficulties and recommendations.

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Additional resources for Terramechanics and Off-Road Vehicle Engineering, Second Edition: Terrain Behavior, Vehicle Design and Performance

Sample text

Based on these observations, various semi-empirical factors (or parameters) have been introduced to the Boussinesq equation, to account for the behaviour of different types of terrain. For instance, Frohlich introduced a concentration factor υ to the Boussinesq equation. G. 6: Distribution of radial stresses under a point load in soils with different concentration factors (Reprinted by permission of ASABE from Sohne, 1958) The value of υ depends on the type of terrain and on its moisture content.

4). Such a strip load may be considered as an idealization of that applied by a tracked vehicle, with the track assumed to be equivalent to a rigid footing with uniform normal pressure. G. 7) The points in the medium that experience the same level of stress may be described in the form of a family of isostress lines (or surfaces), commonly referred to as pressure bulbs. 5. It is interesting to point out that at a depth equal to the width of the track, the vertical stress under the centre of the loading area is approximately 50% of the pressure p0 exerted on the surface by the track.

It should be pointed out that when the normal and shear stress distributions on the wheel–soil interface are specified, the performance Modelling of Terrain Behaviour 49 of the wheel, expressed in terms of motion resistance, thrust, drawbar pull and tractive efficiency, is completely defined (Wong, 1977). Thus, in the early work the role of the finite element method is restricted to predicting the stress distribution and deformation in the soil mass for given normal and shear stress distributions on the wheel–soil interface.

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