Development of methods and means for determining traction-dynamic and fuel-economic parameters of the tractor under operating conditions

Arzhenovskiy, Aleksey; Г, Арженовский А.

doi:10.17816/0321-4443-66341

Cited by 4 publications

(1 citation statement)

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“…Для оптимизации математической модели далее принимаются допущения: тяговое усилие F на крюке тягача [15,16] -величина неизменная; инертные массы тягача и буксируемых объектов одинаковы и равны m.…”

Section: методы исследованияunclassified

Analysis and rationale of TOW units for tractors with massive towed objects

Popov,

Filkin,

Moiseev

et al. 2023

Vestnik IzhGTU imeni M.T. Kalashnikova

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The most difficult stage in the operation of a tractor with massive towed objects is the starting mode. This is due to the need to overcome the static friction force, which significantly exceeds the motion friction force. As a solution to this problem, we can consider the use of the initial kinetic energy of the tractor, which can be developed when using limited elastically deformable tow units. To optimize the mathematical model, the following assumptions are made: traction force F on the hook of the tractor is a constant value; the inertial masses of the tractor and towed objects are the same and equal m. The dynamics of a tractor and massive towed objects is described by means of theoretical mechanics, taking into account the elastic deformation of tow units. The composed systems of linear homogeneous differential equations with right-hand sides are solved by the method of elimination of functions with increasing of exponential order, as a result of which differential equations of the fourth and sixth power are formed. Initial conditions at t = 0: since the tow unit is not deformed and no force is applied to the towed object. The periods t2 and t3 are determined, during which the tow units will undergo maximum deformation. To assess the effectiveness of the use of elastically deformable tow units, the results obtained should be compared with similar results corresponding to absolutely rigid tow units. Comparison of displacements, speeds and energy testifies to the high efficiency of the elastically deformable tow units. The use of elastically deformable tow units makes it possible to accumulate the initial kinetic energy of an aircraft tow tractor, which makes it possible to overcome the static friction force and ensure the starting of heavy towed objects. Comparison of the kinematic and dynamic parameters of the tractor with towed objects for options with absolutely rigid and elastically deformable tow units shows that the efficiency of using the latter increases with an increase in the number of towed objects. Elastically deformable tow units can cause oscillations of the tractor-towed objects system. To prevent them, the tow units must be blocked at the moment of their maximum deformation.

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Section: методы исследованияunclassified

Analysis and rationale of TOW units for tractors with massive towed objects

Popov,

Filkin,

Moiseev

et al. 2023

Vestnik IzhGTU imeni M.T. Kalashnikova

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Digital Data Processing Methods for Estimating Tractive Force of Tractors

Fedorenko

Tarkivskiy

Mishurov

et al. 2021

Engineering Technologies and Systems

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Introduction. When carrying out an energy assessment of agricultural machines and traction tests of tractors, the most important indicator is the value of the tractive effort. The existing methods for determining the tractive effort of tractors imply the use of specialized measuring instruments, such as strain gauges and devices for processing and displaying information. The accuracy of determining the tractive effort is significantly influenced by the physical and mechanical properties of soil. To process the useful signal during the measurement of tractive effort, the data stream of the strain gauge sensor must be subjected to additional digital filtering taking into account the operating conditions of the agricultural unit. Materials and Methods. The functions of changing the tractive effort obtained on the K-744R2 tractor in various gears have been analyzed. An algorithm for digital processing of the signal of a strain gauge force meter based on a median filter has been developed that makes it possible to increase the measurement accuracy. The advantage of the proposed method is the ability to cut off sharp short-term impulse noise and sharp fluctuations in the amplitude of the measured value. Results. A method for determining the amount of tractive effort using median signal processing has been proposed. A device for determining the tractive effort during testing of agricultural tractors and units has been developed. The choice of the main components of the device for determining the magnitude of the tractive effort has been substantiated. As a result of the research, a device for measuring and digital processing of the signal of a force meter based on a microcontroller and specialized software for processing initial data in real time was designed and manufactured. Discussion and Conclusion. The developed method makes it possible to exclude the negative effect of impulse noise arising in the process of measuring the tractive effort of the tractor. The proposed device for measuring the tractive effort of tractors is compatible at the level of the exchange protocol with existing devices, has a high speed of operation in real time, multi-channel operation.

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Determining the Traction Characteristic of a Tractor in Operating Conditions

2018

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One of the most important aspects in terms of increasing the efficiency of agricultural production is the improvement of the methods and tools of determining the main operating indicators of tractors as they influence the productivity, efficiency and ecological safety of machinetractor units. (Research purpose) To develop a method for obtaining traction characteristics of a tractor, which make it possible to reduce the time needed for measurements under operating conditions, and to design an instrument for economical obtaining of tractors’ traction characteristics under specific farm conditions. (Materials and methods) the authors have chosen a method for determining the energy performance of tractors under operating conditions in a transient mode. They have conducted traction tests of tractors for various modes and soil backgrounds to evaluate its tractiondynamic and fueleconomic indicators. The traction characteristic of a tractor is the dependence of the tractor performance (traction power, speed, hourly and specific fuel consumption, and slipping) on the load at various speeds against a given soil background. However, traction tests require expensive equipment, as well as significant costs and time to prepare and conduct, which leads to their implementation only in the conditions of machine testing stations. (Results and discussion) The authors have developed a method for obtaining traction characteristics of a tractor under operating conditions. Instantly increasing the fuel supply to the maximum, during the tractor acceleration, the engine crankshaft speed and trackmeasuring wheel were measured at a given speed and against the corresponding soil background with load and without load. It has been revealed that the fuel and economic indicators can be determined using cyclical fuel supply by the fuel pump at the maximum mode on the bench for checking and adjusting the fuel equipment. The authors have developed and assembled a measuring and computing installation that allows processing arrays of data from two inductive sensors. (Conclusions) The proposed method for determining the tractiondynamic and fueleconomic indicators of tractors and the measuringcomputing installation that implements it allow obtaining a traction characteristic (speed, slipping, traction power, hourly and specific fuel consumption depending on the load at various speeds against a given soil background) in operating conditions, thus reducing the time and cost of operation.

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Development of methods and means for determining traction-dynamic and fuel-economic parameters of the tractor under operating conditions

Cited by 4 publications

References 0 publications

Analysis and rationale of TOW units for tractors with massive towed objects

Analysis and rationale of TOW units for tractors with massive towed objects

Digital Data Processing Methods for Estimating Tractive Force of Tractors

Determining the Traction Characteristic of a Tractor in Operating Conditions

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