scholarly journals Improvement of Traction Indicators of a Track-Chain Tractor

2020 ◽  
Vol 22 (3) ◽  
pp. 89-102
Author(s):  
Salavat Mudarisov ◽  
Ilshat Gainullin ◽  
Ildar Gabitov ◽  
Eduard Khasanov
Keyword(s):  
Rolling Resistance ◽  
Support Surface ◽  
Efficiency Coefficient ◽  
Vertical Load ◽  
Propulsive Efficiency ◽  
Chain Links ◽  
Traction Power

The aim of this research was to conduct the comparative traction tests for T-170M1.03-55 tractor with a flat and elliptical rim. Structurally rational geometry of the crawler's support surface for tractors with semi-rigid suspension is realized by placing the support rollers at different heights relative to the cart. The results of traction tests showed that elliptical track rim has increased the maximum traction power by 10.4%, conditional traction propulsive efficiency coefficient to 7.43% and the specific traction effort by 8%. The increase in indicators is provided by a lower rolling resistance of a tractor with an elliptical rim. Reduction of the resistance power to rolling of the tractor with an ellipse track rim occurs due to alignment of support rollers vertical load and reduction of resistance to rollers movement on internal contours of tracks and in hinges of track chain links. The results of the research indicate a significant improvement in traction performance of T-170M1.03.55 tractors with elliptical track-chain rim.

scholarly journals Reducing the soil structure destruction along the rut and increasing the traction properties of the tractor by using the rear grouser of the track link

2021 ◽  
Vol 282 ◽  
pp. 07009
Author(s):  
V.N. Kozhanov ◽  
M.A. Rusanov ◽  
M.G. Shtyka ◽  
V.S. Kukhar
Keyword(s):  
Traction Force ◽  
Rolling Resistance ◽  
Resistance Coefficient ◽  
Support Surface ◽  
Horizontal Deformation ◽  
Tangential Traction ◽  
Soil Destruction ◽  
Agricultural Tractors ◽  
Agricultural Tractor ◽  
Traction Power

The traditionally used mixed grouser of the metal track link causes a decrease in the traction qualities of the agricultural tractor. The use of a rear grouser on the track link, in our opinion, will significantly improve the traction properties of an agricultural tractor with a metal track and reduce the soil destruction. When the rear grouser is immersed in the soil, an additional horizontal deformation of the soil occurs, which changes the law of horizontal deformation distribution along the support surface of the trackdrive, which ensures the alignment of the link shares in the implementation of the tangential traction force. This leads not only to a reduction in the trackdrive skidding, but also to a reduction in tractor rolling losses. Comparative tests of the T-4A tractor with a serial track, and a track on which links the front grousers were removed showed that the maximum traction power increases from 59 to 65 kW, the skidding with a hook load of 40 kN decreases from 14.6 to 9.4%, the rolling resistance coefficient decreases from 0.093 to 0.072, eliminates the “scissors” effect, which will reduce the number of erosive-dangerous particles in the track trace to 30...40%, which is 5.6...4.25 times less than in agricultural tractors with a mixed grouser, which confirms the effectiveness of their use.

scholarly journals Analytical determination of application point and normal reaction arm when rolling a wheel on a drum

2021 ◽  
Vol 341 ◽  
pp. 00039
Author(s):  
Maria Karelina ◽  
Tatyana Balabina ◽  
Alexey Mamaev
Keyword(s):  
Rolling Resistance ◽  
Analytical Determination ◽  
Support Surface ◽  
Rigid Support ◽  
Normal Reaction ◽  
Normal Forces ◽  
Elastic Wheel ◽  
Wheel Rolling ◽  
Force Equilibrium

Evaluation of the rolling resistance of car tires is now often performed on drum stands like car tests. This necessitates the study of the mechanics of interaction between the wheel and the drum in order to determine its force and kinematic characteristics, including the values and points of application of tangential and normal forces in contact with the drum. These problems can be solved taking into account that the mechanics of elastic wheel rolling on a drum is the same as when rolling on a flat rigid support surface. In this paper, from consideration of the mechanics of interaction between an elastic wheel and a drum, using the equations of power balance and force equilibrium of the wheel, the equations for determining the point of normal reaction in contact and its arm relative to the wheel axis during its rolling along one and two drums have been derived.. These dependencies have a simple form and can be applied when considering the rolling of both a single wheel and the car as a whole on a drum stand.

The rolling resistance of truck tyres under a dynamic vertical load

2005 ◽  
Vol 43 (sup1) ◽  
pp. 135-144 ◽  
Author(s):  
Arnaud J. P. Miege ◽  
Atanas A. Popov
Keyword(s):  
Rolling Resistance ◽  
Vertical Load

scholarly journals Operation of a traction machine’s wheel mover with a locked asymmetrical balance bar

2021 ◽  
Vol 341 ◽  
pp. 00011
Author(s):  
Vladimir Zhulay ◽  
Yuriy Ustinov ◽  
Vitaliy Tyunin ◽  
Aleksey Shchienkо
Keyword(s):  
Support Surface ◽  
Vertical Load ◽  
Transport Mode ◽  
Tire Wear ◽  
Asymmetrical Balance

The problems of determining the parameters of a traction machine’s wheel mover with a locked asymmetrical balance bar operation, taking into account the kinematic mismatch arising from the redistribution of the vertical reactions at the driving wheels due to off-center pushing force, have been considered. An algorithm for calculating traction and braking forces, as well as drive wheels’ slippage and skid of an asymmetric balance bar based on their traction balance and the condition of equal actual speeds under a variable vertical load, have been presented. As a result of research it has been found that the greatest additional loads in the drive and tire wear of the wheel mover with a locked asymmetric balance bar will occur when it moves in transport mode on a support surface with high traction properties.

Influence of tyre pressure and vertical load on coefficient of rolling resistance and simulated cycling performance

Ergonomics ◽  
1999 ◽  
Vol 42 (10) ◽  
pp. 1361-1371 ◽  
Author(s):  
F. Grappe ◽  
R. Candau ◽  
B. Barbier ◽  
M. D. Hoffman ◽  
A. Belli ◽  
...  
Keyword(s):  
Rolling Resistance ◽  
Cycling Performance ◽  
Vertical Load ◽  
Tyre Pressure

scholarly journals INFLUENCE OF VERTICAL LOAD ON BRAKING FORCE AND TYRE ADHESION COEFFICIENT OF VEHICLE WHEEL

2018 ◽  
Vol 18 ◽  
pp. 383-392
Author(s):  
D. N. Leontiev ◽  
N. G. Mikhalevich ◽  
A. A. Frolov
Keyword(s):  
Automatic Regulation ◽  
Initial Moment ◽  
Support Surface ◽  
Vertical Load ◽  
Adhesion Coefficient ◽  
Road Surfaces ◽  
Braking Torque ◽  
Vehicle Active Safety ◽  
Experimental Researches ◽  
Automobile Wheel

Influence of vertical load on the adhesion coefficient of automobile wheel in the braking mode on the basis of experimental researches is analyzed. Research results of different authors concerning the degree of the influence of various factors on the adhesion coefficient are presented. It is known that the fundamental basis of vehicle active safety is its braking properties, and the nature of braking depends on the interaction of motorcar tires with road surfaces. Such interaction in the theory of a car is usually described by the adhesion coefficient, which can be implemented both in the longitudinal and transverse directions relative to the rotation area of the vehicle wheels. Experimental researches on rolling car wheel of locking border have demonstrated that a high change of filling speed of the brake chamber does not contribute to increasing the braking efficiency and consequently, the work of the modulator in the mode of intensive filling of brake chamber makes no sense. Vice versa, as experimental researches have demonstrated, the reduction of filling rate of the brake chamber increases the efficiency of braking, although at the initial moment of time, due to the low braking torque, the efficiency is slightly underestimated. Considering the inconsistency of the adhesion coefficient in automotive practice will allow modeling dynamics of vehicle inhibition with automatic regulation systems at a higher level and with greater reliability. Increasing the vehicle mass leads to a decrease in the coupling properties of its tires and consequently to reduce the amount of deceleration, reducing its mass, vice versa increases the coupling properties between the tire and support surface, which positively affects the performance of the vehicle braking (its slowing increases).

scholarly journals Refined method for determining the current agricultural machinery tire wearing surface area

2021 ◽  
pp. 10-15
Author(s):  
V.Yu. Revenko ◽  
◽  
S.S. Frolov ◽  
A.N. Tkachenko ◽  
A.B. Ivanov ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Surface Area ◽  
Field Tests ◽  
Efficiency Coefficient ◽  
Vertical Load ◽  
Agricultural Machinery ◽  
Specific Pressure ◽  
Refined Method ◽  
Predictive Assessment ◽  
Agricultural Machines

It has been established that the predictive assessment of the level of impact on the soil of tractors and agricultural machines is based on the calculation of the specific pressure equal to the ratio of the vertical load to the propeller contact surface area. A mathematical model is proposed that has been developed based on the results of field tests of a large number of samples of agricultural tires. The adequacy of the model was assessed using the Nash-Sutcliffe efficiency coefficient.

Truck tyre modelling for rolling resistance calculations under a dynamic vertical load

2005 ◽  
Vol 219 (4) ◽  
pp. 441-456 ◽  
Author(s):  
A J P Miège ◽  
A A Popov
Keyword(s):  
Experimental Data ◽  
Rolling Resistance ◽  
Vertical Load ◽  
Frequency Range ◽  
Model Predictions ◽  
Tyre Modelling ◽  
Truck Tyre

This paper deals with tyre modelling to predict the rolling resistance of truck tyres under a dynamic vertical load. Several models are applied and modified to perform the desired calculations. The model predictions are compared with the available experimental data on rolling resistance under a dynamic vertical load. The analysis is extended into a larger frequency range so that the different models considered can be assessed, and recommendations are made as to which model is best suited to the desired purpose. Within the frequency range considered and based on the experimental data available, Pacejka's model appears to give the best results.

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