Agile tire slippage dynamics for radical enhancement of vehicle mobility

Gray, Jeremy P.; Vantsevich, Vladimir V.; Paldan, Jesse R.

doi:10.1016/j.jterra.2016.01.002

Cited by 25 publications

(10 citation statements)

References 35 publications

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“…Estimation of a mass of bundle of trees is usually carried out in studies related to the evaluation of traction characteristics of skidding tractors (Gray et al 2016, Stoilov and Kostadinov 2009, Vechinski et al 1998). Phillips (1983) determined the mass of a bundle Phillips (1983) used the developed computer program.…”

Section: Discussionmentioning

confidence: 99%

Simulation Modeling of Truck Load of Skidding Tractors with a Grapple for Chokerless Skidding

Shegelman

Будник

Baklagin

2019

Croat. j. for. eng. (Online)

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The objective of the present study is to define mass distribution laws for a bundle of trees using the methods of statistical simulation modeling in order to calculate chokerless skidding tractors lift capacity. For that purpose a statistical simulation model has been developed to generate forest taxation data necessary for complete filling of skidding tractor grapple. The following samples have been obtained from the regions of the European North of Russia based on the model: masses of bundles of trees that can be placed in grapple and values of vertical component of normal load applied to skidding tractor grapple. Minimum values for masses of bundles may vary in the range of 40-87% from the average value. Maximum values may vary in the range of 8-55% from the average value. The difference between the maximum and minimum masses of bundle values increased with increasing the capacity grapple and decreased with increasing the distance from the butt to grapple. We have determined the dependence of bundle mass variation and values of vertical component of normal load applied to skidding tractor grapple on capacity grapple for the regions of the European North of Russia. The studies have allowed determining recommended values for chokerless skidding tractors lift capacity. The analysis of specifications of various models of skidding tractors has shown that clambunk skidders have deficient marginal lift capacity.

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Section: Discussionmentioning

confidence: 99%

Simulation Modeling of Truck Load of Skidding Tractors with a Grapple for Chokerless Skidding

Shegelman

Будник

Baklagin

2019

Croat. j. for. eng. (Online)

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“…Tire pressure combinations were as follows: front tire pressure During the tests, we measured tractor resistance to movement and the number of revolutions of the front and rear wheels at non-zero and zero wheel torque under the condition that the wheels' travel (D = 50 m) is the same in both modes. As reference (Gray et al 2016) and practice shows, the distance of 50…60 m gives a sufficient accuracy of experimental studies. For calculation of MFWD tractor's lead of front wheels and movement resistance force dependences on the inflation pressure of the tires, we conducted the abovementioned measurements when the tractor was travelling in the following modes: -when the tested tractor was pulled with the front drive axle enabled and gear (H 2-1, forward) activated while fuel flow to the engine was cut-off (i.e., with non-zero wheels' torque); -when the tested tractor was pulled with the front drive axle disabled and gear (H 2-1, forward) activated while fuel flow to the engine was cut-off (i.e., with zero front wheels' torque and non-zero rear wheels' torque); -when the tested tractor was pulled with the front drive axle enabled and gear deactivated (i.e., with non-zero wheels' torque); -when the tested tractor was pulled with the front drive axle disabled and gear deactivated (i.e., with zero wheels' torque).…”

Section: Equipment Site and Measurementsmentioning

confidence: 92%

“…When the tractor is in motion in 4WD mode, the kinematic discrepancy between the front and rear wheels causes them to slip/skid to some extent. In vehicle tests, the tire slippage is determined by the number of revolutions of the wheel in the driving n drive and driven n driven modes (i.e., with a non-zero and zero wheel torque) under the condition that the wheel travel is the same in both modes (Basrah et al 2017;Gray et al 2016;Misiewicz et al 2016). We calculated the coefficient of slip (or skid -in the case of negative values) for the front and rear wheels of the tractor according to the following equations:…”

Section: Calculation Of Measured Parametersmentioning

confidence: 99%

Impact of the Inflation Pressure of the Tires on Lead of Front Drive Wheels and Movement Resistance Force of Tractors

Janulevičius

Gurevičius

2019

Transport

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The transmission of mechanical front-wheel drive tractors normally has a front axle lead ratio, which is equal to 1.5…2.5%. Naturally, when ballast masses are added to the tractor or when inflation pressure in the tires is reduced, distortion of the tires is inevitable, which changes the lead of the front wheels. In this paper, we present the impact of tire inflation pressures on the lead front drive wheels and movement resistance force when the tractor travelled with a front drive axle enabled and was engine braking with the fuel supply off. It was found that the variation in front and rear tires inflation pressure combination can significantly change the lead of the front drive wheels. For the tested tractor up to 6.9%. The result is that when the tractor travelled with the front axle enabled and was engine braking, the engine-braking efficiency decreases with increasing lead of the front wheels. Front (slipping) wheels create the opposite-direction torque, which is transferred to the rear wheels through the tractor’s front-rear axle drive system. Additional losses of the engine braking occur in transmission due to power circulation, and the result is that the tractor wheels receive less braking torque from the engine.

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“…These include the analytical and semi-analytical solutions proposed by Marshall (1968), Dagan and Tulin (1969), Collins (1972Collins ( , 1978, Karafiath and Nowatzki (1978), Petryk (1983), Tordesillas and Shi (2000), and Hambleton and Drescher (2009a), as well as the numerical models developed using either finite element or discrete element methods by Yong et al (1978), Liu and Wong (1996), Fervers (2004), Chiroux et al (2005), Shoop et al (2006a,b), Asaf et al (2006), Hambleton and Drescher (2009a,b), Modenese (2013), Johnson et al (2015), Xiao and Zhang (2016), Ozaki and Kondo (2016), and Nishiyama et al (2016) among others. Alternative mathematical models, developed ad hoc from theoretical considerations or experimental evidence (e.g., Higa et al, 2015) or based on simplifying physical assumptions (e.g., Gray et al 2016), can also be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Predicting wheel forces using bearing capacity theory for general planar loads

Hambleton¹,

Stanier²

2018

Preprint

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This paper assesses the applicability of bearing capacity theory for evaluating the forces generated on wheels operating on clay under steady rolling conditions. Considering recent advances in bearing capacity theory, namely with respect to the interaction diagrams developed for general loading, a theoretical model for computing the horizontal force or torque from fundamental input parameters such as the vertical force (weight), wheel diameter, and undrained shear strength of the soil is presented. The predictions are compared with existing analytical solutions and data from laboratory testing, and reasonable agreement is demonstrated. The foremost conclusion is that bearing capacity theory can be used to obtain reasonable predictions of wheel forces analytically under any operating condition (driven, braked, or towed), provided the contact length and so-called contact angle, which defines the position of the contact interface, can be estimated. Aside from providing a rigorous and highly convenient framework for evaluating wheel forces under arbitrary loading, the analysis enables a natural physical interpretation of the mobility problem.

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Agile tire slippage dynamics for radical enhancement of vehicle mobility

Cited by 25 publications

References 35 publications

Simulation Modeling of Truck Load of Skidding Tractors with a Grapple for Chokerless Skidding

Simulation Modeling of Truck Load of Skidding Tractors with a Grapple for Chokerless Skidding

Impact of the Inflation Pressure of the Tires on Lead of Front Drive Wheels and Movement Resistance Force of Tractors

Predicting wheel forces using bearing capacity theory for general planar loads

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