Request PDF on ResearchGate | Terramechanics and Off-Road Vehicle Engineering | This book will be of great interest to any professional engineer or. PDF | Bekker's Derived Terramechanics Model (BDTM) is an analytical tool for evaluating vehicle off-road mobility. BDTM has been developed using Bekker's. Terramechanics and. Off-Road Vehicle. Engineering. Contents: Page 2. Terramechanics and Off-Road Vehicle Engineering. Page 3. Terramechanics and.

Terramechanics And Off-road Vehicle Engineering Pdf

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download Terramechanics and Off-Road Vehicle Engineering - 2nd Edition. Print Book & E-Book. Terrain Behaviour, Off-Road Vehicle Performance and Design. 0 star rating Write a review DRM-free (EPub, PDF, Mobi). × DRM-Free. This book will be of great interest to any professional engineer or automotive engineering student working on off-road vehicles. Reflecting the increase in. Terramechanics and Off-Road Vehicle Engineering will be of great interest to any professional engineer or automotive engineering student working on off-road.

The controllability limits in the direction of performance of the vehicle.

The target of the considered in relation to the steady-state handling torque vectoring control is to reduce the offset between responses on deformable terrains. For instance, in the Mz-curves at different longitudinal acceleration contrast to on-road driving, the variant of torque values and under consideration of the controllability distribution in proportion to the vertical load should limits.

In doing so, the variation of the vehicle take into account that increasing of vehicle weight on cornering response induced by the longitudinal the front axle in off-road conditions generates also an dynamics can be reduced. In deceleration conditions, increased yaw rate and lateral acceleration. The cause the effect of the Mz-variation cannot be fully of this behaviour can be ascribed to sinkage and soil compensated because the steady-state curve intersects shear strength effects as explained in [7].

Additional the controllability limit during braking see the blue sinkage can lead to a higher side force in the tyre- dot-dashed line in Figure 3. Then, the resulting cornering stiffness Shimada and Shibahata [4] have presented three of the front tyres increases with vertical load and the possible approaches of Mz-compensation: i a vehicle tends to more oversteer, especially with the low differentiation of the wheel torques within the rear axle turning velocity and increased yaw velocity.

With left-to-right torque vectoring technique ; ii an active respect to the soil shear strength, steady-state cornering roll control system capable of varying the lateral load at the same manoeuvre conditions can result in transfer distribution between the two axles; and iii a oversteer vehicle behaviour on soft soils such as sand four-wheel-steering 4WS system.

The conclusions of and a understeer behaviour on moderate firm grounds the analysis are that the in-axle torque vectoring like clay soils. All these effects should be also taken methodology for the specific case study vehicle is into account while developing the torque vectoring able to fully compensate the load transfer and the tyre control strategy for all-terrain vehicles. Also, this method proves to be much more effective in the compensation than the Several studies [3, 4] have analysed the Active Roll Control system and the 4WS system compensation of the variation of the vehicle dynamic described in [4].

The compensation method is based on the front-to-rear torque distribution in off-road conditions analysis of the variation of the available vehicle yaw has been given in [7]. The authors of [7] explained that this fact can be caused by the restriction of the circumferential forces by the soil shearing strength.

Terramechanics and Off-Road Vehicle Engineering, 2nd Edition

The same study has confirmed that the shifting of torque distribution to the rear axle can give a significant improvement in the yaw dynamics for off- road transient manoeuvres. The kinematic discrepancy significantly influences the power distribution between the driving axles and wheels and as consequence fuel consumption and stability.

One of 3 the first investigations in this area relates to the works capability and the power losses due to wheel slip and of Dudzinski [8], and the detailed description of the rolling resistance.

The results presented in [10, 11 ] indicate terrain vehicles. For instance, the relevant TV methods that the control of the torque transfer ratios between the for electric ground vehicles operating in off-road front and the rear axles during cornering on dry and wet conditions have been proposed by Yamakawa, soils can minimize the kinematic discrepancy and Watanabe, and Kojima [16, 17].

This additional feature can also be on optimal torque determination by criteria of included in the TV control strategy. The method in [16] used the ratio of vertical load on a wheel to the total load on the 4 Torque vectoring and longitudinal vehicle as one of the target control characteristics.

A number of studies point out that the conditions. Firstly, a better traction.

For example, the results presented in surface with obstacles having a range of bumps with [12] for an all-wheel drive sport utility vehicle show different heights up to 0. However, slow and medium velocities. For instance, the Haldex eAWD system proposed for mid-size AWD cars has shown increased acceleration capacities compared with a conventional front wheel drive powertrain [13].

Several torque vectoring controller. For instance, [14] shows relevant solutions can be mentioned in this context.

As a result, the rolling powertrain. The corresponding car is equipped with the resistance losses can influence the power flows between TV power dividing unit differential on the rear axle the driveline and the wheels, and must be taken into and allows shifting between the hybrid and TV driving account for the development of the torque vectoring modes.

The TV system can redistribute the torque control strategy.

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A second source of tyre power loss is within the range of 0… Nm and is mainly being constituted by the slip ratio, which can reach operated at high velocities to improve the overall drive particularly high values in off-road conditions, in efficiency. In terrain It should be noted that the architecture of the conditions, values of slip ratio up to 0.

Hence, the off-road torque vectoring configuration and strategy of a TV system on an control should achieve a trade-off between traction electric vehicle. For example, [19] discusses the design of a hybrid all-terrain sport utility vehicle and shows 4 that the TV functions realized through two electric vehicle components and subsystems.

Jo Y. Wong

At full vehicle motors provide better integration with the control on scale, experimental testing of the entire system will be hybrid driving modes than with a configuration of one performed using a highly versatile vehicle demonstrator electric motor and a TV differential. Figures 4 and 5 that can replicate drivetrain A comparative analysis of different TV solutions for architectures ranging from one to four electric motors.

Development and demonstration of novel strategies for the modulation of the torque output of the individual electric motors to enhance brake energy recuperation, anti-lock brake ABS and traction control TC functions.

The benefits of these strategies include reductions in: i vehicle energy consumption, ii stopping distance, and iii acceleration times To achieve these targets, advanced torque vectoring control strategies for vehicle layouts characterised by Fig.

The corresponding target reference vehicle should provide better driving stability. However it must be pointed out that the longitudinal acceleration ax influences the behaviour of the reference understeer characteristic.

To give an example, Figure 6 displays a tree of the reference ay characteristics shaped for different ax-levels. They have trends i to more understeer with the growth of ax and ii to oversteer by negative ax-values.

Wong, Elsevier, Amsterdam, , pp. Professor Wong is the natural successor of the late Dr. Bekker, who first developed the science of terramechanics, this book will join Bekker's three books and an earlier book by Wong as the standard reference books on this subject.

This book reviews the various methods used to characterise soil strength and to predict the tractive performance of off-road vehicles. These methods include empirical and theoretical methods and parametric analysis.

The author concludes that parametric analysis, as first developed by Bekker, is the only method which provides techniques which are of practical value to the vehicle designer and user and are also applicable to the design of totally new vehicles or vehicles operating in new environments. The book contains detailed discussion of the practical problems involved in interpreting soil strength measurements, because of the inevitable variability of the data.

There is a particularly valuable section dealing with the statistical analysis of the data and it is shown how the quality of the data obtained can be improved by the use of m o d e m electronic data collection and processing equipment.

Much of this part of the book is taken up by discussion of the particular problems associated with measuring the strength properties of snow and muskeg. In particular, the author shows how to deal with terrain which recovers between the passage of one wheel and another, by a repetitive loading test, and how to characterise muskeg consisting of a surface mat overlying weaker peat and snow frozen in layers.

The largest section of the book deals with the prediction of tractive performance of tracked vehicles in soft snow, muskeg and soil. This consists of a description of the NTVPM computer model developed by the author and his colleagues. The model is far more comprehensive than any other approach which has been previously developed and enables the effects on performance of all track design features to be investigated.

Experiments carried out to validate the model in snow and muskeg are described and the degree of agreement between measured and predicted results is extremely good, considering that the measurements were made in naturally occurring ground conditions. As an example of the way in which the model can be used, the author shows predicted results, in snow and a wet clay soil, for vehicles having different track system configurations, suspension characteristics, initial track tension, weight, position of centre of gravity, ground clearance and sprocket location.Add both to Cart Add both to List.

Firstly, a better traction. site Restaurants Food delivery from local restaurants. Please try again later. Catt Editors. Ideal for professional reference and course reference by students, with new detailed worked design examples, case studies, and accompanying problems and solutions.

V vehicle velocity [14] Wong, J. The benefits of these strategies include reductions in: i vehicle energy consumption, ii stopping distance, and iii acceleration times To achieve these targets, advanced torque vectoring control strategies for vehicle layouts characterised by Fig.