Power Delivery Efficiency: A Valid Measure of Belt and Tire Tractor Performance

Zoz, Frank; Turner, Reed J.; Shell, Lon R.

doi:10.13031/2013.8817

Cited by 11 publications

(4 citation statements)

References 5 publications

(3 reference statements)

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“…Moreover, according to the reduction of traction efficiency with the tyre pressure, also the power delivery efficiency decreases when tyre pressure increases. Similar distributions of the power delivery efficiency were reported by Zoz et al (2002) as a function of the vehicle traction ratio. (Figure 9a) and at a tyre pressure of 160 kPa (Figure 9b), at the four soils under consideration.…”

Section: Measurement and Fitting Of Power Delivery Efficiency  Pd Ansupporting

confidence: 80%

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Influence of Soil on the Traction Performance of a 65 kW MFWD Tractor

Battiato¹,

Diserens²

2019

JAS

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This study aimed to investigate the influence of the mechanical behaviour of the soil surface on the traction performance and the fuel consumption of an agricultural tractor, both in qualitative and in quantitative terms, in order to increase the consciousness about the major role of the soil mechanical response in the optimisation of the energy aspects involved in the traction developed by a tractor and promote the development of new strategies to reduce costs of tillage management and improve agricultural sustainability. The traction performance of a 65 kW MFWD tractor at tyre pressures of 60 and 160 kPa was compared on four Swiss agricultural soils: a clay with corn stubbles, a clay loam with wheat stubbles, a silty loam and a loamy sand both with corn stubbles. Tests performed with a bevameter pointed out noticeable differences in the mechanical behaviour of the soils. According to such differences, the drawbar pull on the four soils was significantly disparate with differences in maximal values of about 16% at a tyre pressure of 60 kPa and up to 37% at a tyre pressure of 160 kPa. Simulations with a semi-empirical tractor-soil interaction model also showed dissimilarities in traction coefficient, motion resistance, and traction efficiency. Measurements of the fuel consumption pointed out the presence of a narrow slip range where the specific fuel consumption SFC is minimised. This range doesn’t vary significantly among the considered soils as well as with the tyre pressure and doesn’t differ very much from the range where the power delivery efficiency is maximised. The SFC differed for almost 20% among the considered soils at a tyre pressure of 60 kPa and for ca. 10% at a tyre pressure of 160 kPa. The increase in tyre pressure from 60 to 160 kPa produced an increment in SFC up to 16%. The results of this study clearly pointed out how the traction performance is a characteristic of the tractor-soil system and not of the tractor only, therefore, a proper knowledge of the soil mechanical behaviour should aid in developing strategies oriented towards reducing fossil fuel consumption.

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Section: Measurement and Fitting Of Power Delivery Efficiency  Pd Ansupporting

confidence: 80%

“…According to Zoz, Turner, and Shell (2002), the equivalent power-take-off PTO can be used in order to consider the engine power input. In this case, the power delivery efficiency is given by:…”

Section: Consumption Sfcmentioning

confidence: 99%

Influence of Soil on the Traction Performance of a 65 kW MFWD Tractor

Battiato¹,

Diserens²

2019

JAS

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“…The high speed (7-8 km/h) of tractors increases draft by another 20%, compared to the 2.5 km/h or less proposed here. The tractive efficiency of tractor tires is 60% to 80% (Zoz et al, 2002;Zoz and Grisso, 2003), which means that tractor tires lose 20% to 40% of axle power to motion resistance and slip. If properly configured, a tillage device which uses crampons loses less than 10%.…”

Section: Cost and Benefit Calculationsmentioning

confidence: 99%

UTOPUS: A Novel Traction Mechanism to Minimize Soil Compaction and Reduce Energy Consumption

Nannen¹,

Bover²,

Zöbel³

et al. 2020

Preprint

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Tractor tires on agricultural soil suffer from inherent limitations like energy loss due to slip and tire flexing and a need for considerable ballast to gain traction. These limitations contribute to soil compaction, make the agricultural tractor energy-inefficient and make it unviable to power a tractor with solar panels or by storing renewable energy in batteries.To address these disadvantages as a whole, we introduce a novel traction mechanism that allows weeding and cultivation using only autarkic solar energy, based on the novel principle of retractable tines or crampons for traction. The mechanism inserts relatively small crampons every few meters into the soil, and then uses a push-pull mechanism to pull tillage implements through the soil, without any additional ballast. The light weight of the resulting machine and the small contact area of crampons with the soil reduce soil compaction, while the static nature of the crampons minimizes energy loss and increases energy efficiency.We report a range of successful proof-of-concept trials which show the practical feasibility of the basic concept for weeding and soil cultivation with solar energy, wind energy, and electric power supply under different conditions. We also provide calculations on the economic advantages compared to ballasted tires.

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“…There are many other options to improve tractor traction performance. For example, the use of a four-wheel drive tractor instead of a rear-wheel drive tractor [9][10][11][12], tracks instead of wheels [13][14][15], dual wheels instead of single wheels, high-performance radial ply tires [16] instead of outdated bias ply tires, etc. Finally, tire inflation pressure [17][18][19][20] is a very important operation factor that positively affects tractor tractive performance and soil compaction due to an optimum ratio between the tire contact patch [21,22] and the tire rolling resistance.…”

Section: Introductionmentioning

confidence: 99%

Spike Device with Worm Gear Unit for Driving Wheels to Improve the Traction Performance of Compact Tractors on Grass Plots

Abrahám,

Majdan,

Kollárová

et al. 2024

Agriculture

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In general, energy loss reduction via the interaction of tires with the ground improves tractor traction performance when a drawbar pull is generated. This paper is examines the driving wheels with steel spikes for a tractor equipped with modern radial tires. An improved design of the spike device that allows for the change between an active and inactive position of the spikes is presented. The traction performance of a compact articulated tractor with the spike device was tested on a grass plot with two soil moisture contents (SMC). The highest difference in the drawbar pull in the range from 14.2% to 40.5% and from 17.1% to 36.8% was reached by the spikes in the active position in comparison with the tires without spikes, which were at the slip range from 45% to 5% in the case of the low SMC when the test tractor was in the 3rd and 1st gear. The motion resistance difference between the spikes in the active position and the tires without spikes was 11.8% and 2.5% at the low and medium SMC, respectively. At the low and medium SMC, the highest tractive efficiency of 0.765 (0.721) and 0.757 (0.731) was reached by the spikes in the active position when the test tractor was in the 1st (3rd) gear in comparison with 0.736 (0.7) and 0.723 (0.708) in the case of the tires without spikes. The results indicated that the spike device allowed for the improvement of tractor tractive performance.

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Power Delivery Efficiency: A Valid Measure of Belt and Tire Tractor Performance

Cited by 11 publications

References 5 publications

Influence of Soil on the Traction Performance of a 65 kW MFWD Tractor

Influence of Soil on the Traction Performance of a 65 kW MFWD Tractor

UTOPUS: A Novel Traction Mechanism to Minimize Soil Compaction and Reduce Energy Consumption

Spike Device with Worm Gear Unit for Driving Wheels to Improve the Traction Performance of Compact Tractors on Grass Plots

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