scholarly journals Evaluation of Changes in Soil Compaction Due to the Passage of Combine Harvester

2016 ◽  
Vol 64 (3) ◽  
pp. 877-882
Author(s):  
Martin Svoboda ◽  
Marek Brennensthul ◽  
Jiří Pospíšil
Keyword(s):  
Soil Compaction ◽  
Rear Wheel ◽  
Measured Parameter ◽  
Vertical Load ◽  
Lateral Tilt ◽  
Combine Harvester ◽  
Maize Stubble

This paper concerns the results of changes in soil compaction after the passages of combine harvester. The research was done on the maize-stubble; the soil was the mold formed in the sand. The measured parameter was a penetration of resistance in range of depth 0–60 cm. The measurements were done in the ruts after the passages the front and rear wheel of combine harvester. During the experiment two levels of vertical load of wheels were applied – these levels were dependent on filling of grain tank of harvester. Moreover, the influence of the lateral tilt of harvester on the soil compaction was analyzed (the harvester was equipped with the leveling system which allowed to obtain the tilt). The obtained results shows that the increase in vertical load caused greater compaction in ruts. Furthermore, it was found that the passage of tilted harvester caused lower compaction than the harvester without tilt.

scholarly journals Braking Efficiency and Stability of Chassis Braking System of Combine Harvester: The Theoretical Derivation and Virtual Prototype Simulation

2019 ◽  
Vol 2019 ◽  
pp. 1-18 ◽  
Author(s):  
Peilong Li ◽  
Hongmei Xu
Keyword(s):  
Virtual Prototype ◽  
Rear Wheel ◽  
Test Methods ◽  
Theoretical Derivation ◽  
The Road ◽  
Braking System ◽  
Directional Stability ◽  
Driving Speed ◽  
Combine Harvester ◽  
Combine Harvesters

With the advancement of agricultural mechanization, the safety of agricultural vehicles has aroused extensive concern. However, conventional methods evaluate the performance of the combine harvesters in a laborious and inaccurate filed-test way. It is still a challenge to evaluate their performance in a theoretical derivation-based simulation way. Here, we accurately derive the braking model of the combine harvester, which provides a guidance for further braking simulation. Firstly, a four-wheel braking system was designed and theoretically checked. Secondly, the virtual prototype of the chassis braking system was established in ADAMS, in consideration of the complicated contact characteristics between the tire and the road and between the friction pad and the brake disk. Finally, simulation experiments of braking efficiency and directional stability were carried out under different braking conditions. By this means, we find a novel effective yet simple way to optimize the braking efficiency as well as the sufficient braking stability of combine harvesters. The results show that braking efficiency would be improved with stronger braking force, lower initial braking velocity, and lighter weight of the combine harvester. Compared with straight-line braking, steering braking shows lower braking efficiency and less inclination of rear wheel bounce under the same braking conditions. As for braking directional stability, the lateral slippage would be increased with the locking of rear wheels, higher driving speed, or lower road adhesion coefficient. In addition, the simulation results are in agreement with the theoretical results, proving the validity of the virtual prototype simulation. Overall, other than traditional filed-test methods, our method provides an effective yet simple way for designing and evaluating the chassis braking system of combine harvesters.

Simulation Study on Tractor’s Same-Rut-Steering Mechanism

2011 ◽  
Vol 338 ◽  
pp. 236-240
Author(s):  
Ren Cai Zhao ◽  
Xu Ma ◽  
Long Qi ◽  
Rui Chuan Li
Keyword(s):  
Soil Compaction ◽  
Three Dimensional ◽  
Rear Wheel ◽  
Front Wheel ◽  
Steering Wheel ◽  
Steering Mechanism ◽  
Environment Simulation ◽  
Parameterized Model ◽  
Simulation Results ◽  
Deflection Rate

When tractor steers in the same rut, it can not only improve its flexibility in steering, but also reduce soil compaction and crop rolling. In this paper , the concept of tractor steering in the same rut was proposed on the basis of four-wheel-steering (4WS) theory, and the angle relationship between front wheel and rear wheel, which can achieve the same-rut-steering, was established. A three dimensional parameterized model of tractor’s same-rut-steering mechanism was established by the Pro/E software, and its running tracks were simulated in the ADAMS environment. Simulation results show that the same-rut-steering accuracy was affected to some extent when tractor’s speed or steering wheel deflection rate was changed. At last, methods for improving the same-rut-steering accuracy were put forward.

Vehicle Braking Stability Analysis in Turn Condition

2014 ◽  
Vol 607 ◽  
pp. 604-607 ◽  
Author(s):  
Ling Zhao
Keyword(s):  
Stability Analysis ◽  
Dynamic Model ◽  
Load Transfer ◽  
Rear Wheel ◽  
Front Wheel ◽  
Vertical Load ◽  
Steering Angle ◽  
Braking Distance ◽  
Simulation Results

Considering the influence of wheel vertical load transfer and Steering angle, the paper establishes a dynamic model of 7 degrees freedom for vehicle under Braking in Turn Condition. Based on this model, wheel lock braking and ABS braking were researched and simulated. The simulation results show directly that first lock of front wheel loses vehicle steering performance, first lock the rear wheel sideslips, ABS braking can prevent loss of vehicle steering performance and sideslip, but slightly long braking distance.

scholarly journals Investigating the Effect of the Tractor Drive System Type on Soil Behavior under Tractor Tires

Agronomy ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 696
Author(s):  
Abdolmajid Moinfar ◽  
Gholamhossein Shahgholi ◽  
Yousef Abbaspour-Gilandeh ◽  
Israel Herrera-Miranda ◽  
José Luis Hernández-Hernández ◽  
...  
Keyword(s):  
Bulk Density ◽  
Soil Compaction ◽  
Soil Bulk Density ◽  
Rear Wheel ◽  
Front Wheel ◽  
Soil Behavior ◽  
System Type ◽  
Soil Displacement ◽  
Wheel Drive ◽  
Displacement Transducers

To determine the effect of the tractor driving system type on the soil compaction and soil behavior a series of tests was conducted using Goldoni 240 tractor with a power rate of 30.8 kW and included four similar tires at three different driving systems (4WD, rear-wheel drive (RWD) and front-wheel drive (FWD)). To evaluate these systems’ effects on soil compaction, tests were conducted at three soil moisture contents (10, 15 and 20% d.b.), three tire inflation pressures (170, 200 and 230 kPa), and three tractor speeds (1.26, 3.96 and 6.78 km/h). Soil bulk density was measured at three average depths of 20, 30 and 40 cm. To evaluate soil compaction, cylindrical cores were used and to assess soil behavior during this process, the soil displacement in a three coordinate system was measured using three displacement transducers. It was found that the 4WD system created the least bulk density of 1155 kg/m3, while the FWD system led to the highest density of 1241 kg/m3. Maximum vertical soil compression of 55 mm occurred for the FWD system and it declined to 43 and 36 mm in RWD and 4WD systems, respectively. Soil displacement in the horizontal and lateral directions was larger for the FWD system in comparison to the other systems. With increment of speed and depth soil compaction decreased. Minimum bulk density of 1109 kg/m3 was occurred at velocity of 6.78 Km/h using the 4WD system, also with this system at the depth 40 cm density was 1127 kg/m3. While at velocity of 1.26 Km/h and depth of 20 cm soil density was 1190 kg/m3.

scholarly journals SOIL COMPACTION OF TIDAL RICE FIELD FROM USE ALSINTAN (CASE STUDY OF TANJUNG LAGO DISTRICT, BANYUASIN REGENCY)

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Suganda C. Saputra ◽  
M. Eddy Armanto ◽  
Momon Sodik
Keyword(s):  
Physical Properties ◽  
Soil Compaction ◽  
Rice Field ◽  
Soil Physical Properties ◽  
Soil Permeability ◽  
Field Environment ◽  
Combine Harvester ◽  
Materials Used ◽  
The Impact

Combine harvester is a rice harvester that can cut the panicles of standing plants, knock down and clean the grain while crossing the rice fields. The use of combine harvester can potentially damage the soil, the soil becomes hard and the use of fuel causes potential air pollution in the rice field environment. The objectives of this study were to identify the impact of soil compaction due to the use of a combine harvester machine and to determine what physical properties affect the soil compaction due to the use of a combine harvester machine. Equipment and materials used for the sand cone test in this study include:transparent bottles, calibration funnels, plates for sand funnels, hammers, spoons, brushes, chisels, scales and sand. The results showed that soil compaction causes porosity and soil permeability was reduced so that it can inhibit plant growth. Soil compaction affects soil physical properties such as bulk density, porosity, and groundwater content. 

scholarly journals Application of Soft Computing Techniques for the Analysis of Tractive Properties of a Low-Power Agricultural Tractor under Various Soil Conditions

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Katarzyna Pentoś ◽  
Krzysztof Pieczarka ◽  
Krzysztof Lejman
Keyword(s):  
Neural Networks ◽  
Soil Moisture ◽  
Low Power ◽  
Soft Computing ◽  
Soil Compaction ◽  
Traction Force ◽  
Soil Conditions ◽  
Vertical Load ◽  
Soft Computing Techniques ◽  
Tractive Efficiency

Considering the fuel consumption and soil compaction, optimization of the performance of tractors is crucial for modern agricultural practices. The tractive performance is influenced by many factors, making it difficult to be modeled. In this work, the traction force and tractive efficiency of a low-power tractor, as affected by soil coefficient, vertical load, horizontal deformation, soil compaction, and soil moisture, were studied. The optimal work of a tractor is a compromise between the maximum traction force and the maximum tractive efficiency. Optimizing these factors is complex and requires accurate models. To this end, the performances of soft computing approaches, including neural networks, genetic algorithms, and adaptive network fuzzy inference system, were evaluated. The optimal performance was realized by neural networks trained by backpropagation as well as backpropagation combined with a genetic algorithm, with a coefficient of determination of 0.955 for the traction force and 0.954 for the tractive efficiency. Based on models with the best accuracy, a sensitivity analysis was performed. The results showed that the traction performance is mainly influenced by the soil type; nevertheless, the vertical load and soil moisture also exhibited a relatively strong influence.

Changes in soil stress during repeated wheeling: A comparison of measured and simulated values

Soil Research ◽  
2018 ◽  
Vol 56 (2) ◽  
pp. 204 ◽  
Author(s):  
Mojtaba Naderi-Boldaji ◽  
Ali Kazemzadeh ◽  
Abbas Hemmat ◽  
Sajad Rostami ◽  
Thomas Keller
Keyword(s):  
Water Content ◽  
Bulk Density ◽  
Soil Compaction ◽  
Travel Speed ◽  
Rear Wheel ◽  
Linear Increase ◽  
Wheel Load ◽  
Wheel Drive ◽  
Stress Variations ◽  
Cone Index

Agricultural machinery traffic is one of the main causes of soil compaction in modern agriculture. Soils with weak inherent soil structural stability already have low bearing capacity and, when subjected to intensive tillage with a high frequency of traffic, are susceptible to severe soil compaction. In this study, repeated wheeling experiments were carried out on an Iranian clay soil prepared at two water contents (corresponding to 0.9 and 1.35 × water content at the lower plastic limit), two wheel loads (light and heavy rear wheel loads of a two-wheel-drive tractor) and two vehicle travel speeds (0.5 and 1 m s–1). The experiments tested whether the stress variations due to repeated wheeling are mainly due to variations in rut depth with repeated tyre passes and whether traffic at a higher travel speed has a smaller compaction effect. Mean normal stress was measured at three depths (0.15, 0.25 and 0.35 m) beneath the centre of tyres using cylindrical Bolling probes. Rut depth and cone index were measured after each pass. The results showed a linear increase in rut depth with consecutive tractor passes, with a greater increase on wet soil. However, bulk density increased more in dry soil than in wet soil at 0.15 and 0.25 m depth, most likely due to soil water content being close to the optimum Proctor water content. At 0.35 m depth, the bulk density increase was larger for wet soil, with obvious impacts of wheel load and travel speed (greater increase for slower speed and heavier wheel). Cone index generally increased with repeated tractor passes, with the greatest increase at 0.35 m depth in wet soil under heavy rear wheel traffic. Stress generally increased with increasing rut depth due to repeated wheeling. Reduced distance between the soil–tyre interface and the Bolling probes with increasing rut depth was investigated as a potential reason using analytical stress simulations, but could not fully explain the increase in stress with rut depth. Therefore, additional factors (e.g. soil strength) must have contributed to the stress increase with increasing number of tractor passes.

Biscogniauxia (Hypoxylon) Canker or Dieback in Trees

EDIS ◽  
2017 ◽  
Vol 2017 (6) ◽  
Author(s):  
Claudia Paez ◽  
Jason A. Smith
Keyword(s):  
Water Stress ◽  
Tree Species ◽  
Soil Compaction ◽  
Urban Areas ◽  
Root Disease ◽  
Poor Health ◽  
Green Spaces ◽  
Opportunistic Pathogens ◽  
Wide Range ◽  
Quercus Spp

Biscogniauxia canker or dieback (formerly called Hypoxylon canker or dieback) is a common contributor to poor health and decay in a wide range of tree species (Balbalian & Henn 2014). This disease is caused by several species of fungi in the genus Biscogniauxia (formerly Hypoxylon). B. atropunctata or B. mediterranea are usually the species found on Quercus spp. and other hosts in Florida, affecting trees growing in many different habitats, such as forests, parks, green spaces and urban areas (McBride & Appel, 2009).  Typically, species of Biscogniauxia are opportunistic pathogens that do not affect healthy and vigorous trees; some species are more virulent than others. However, once they infect trees under stress (water stress, root disease, soil compaction, construction damage etc.) they can quickly colonize the host. Once a tree is infected and fruiting structures of the fungus are evident, the tree is not likely to survive especially if the infection is in the tree's trunk (Anderson et al., 1995).

Evaluation of Loosening and Soil Compaction with a Working Tool of Tillage Machines Using a Hydrodynamic Model

2020 ◽  
Vol 13 (6) ◽  
pp. 394
Author(s):  
Salavat Mudarisov ◽  
Ildar Farkhutdinov ◽  
Airat Mukhametdinov ◽  
Raushan Aminov ◽  
Rustam Bagautdinov ◽  
...  
Keyword(s):  
Hydrodynamic Model ◽  
Soil Compaction

Dynamic Damping and Stiffness Characteristics of the Rolling Tire

2001 ◽  
Vol 29 (4) ◽  
pp. 258-268 ◽  
Author(s):  
G. Jianmin ◽  
R. Gall ◽  
W. Zuomin
Keyword(s):  
Dynamic Behavior ◽  
Variable Parameter ◽  
Low Frequency ◽  
Vertical Load ◽  
Frequency Range ◽  
Inflation Pressure ◽  
Vehicle Simulation ◽  
Dynamic Damping ◽  
Speed Range ◽  
Stiffness Characteristics

Abstract A variable parameter model to study dynamic tire responses is presented. A modified device to measure terrain roughness is used to measure dynamic damping and stiffness characteristics of rolling tires. The device was used to examine the dynamic behavior of a tire in the speed range from 0 to 10 km/h. The inflation pressure during the tests was adjusted to 160, 240, and 320 kPa. The vertical load was 5.2 kN. The results indicate that the damping and stiffness decrease with velocity. Regression formulas for the non-linear experimental damping and stiffness are obtained. These results can be used as input parameters for vehicle simulation to evaluate the vehicle's driving and comfort performance in the medium-low frequency range (0–100 Hz). This way it can be important for tire design and the forecasting of the dynamic behavior of tires.

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