Modeling and simulation of grain threshing and separation in axial threshing units

Miu, Petre I.; Kutzbach, Heinz Dieter

doi:10.1016/j.compag.2007.07.004

Cited by 41 publications

(30 citation statements)

References 2 publications

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“…The structure of threshing and separation probability density equations were in accordance with previous studies conducted by Miu & Kutzbach (2008b), but the specific expressions were not the same. This could be due to the differing characteristics and variables of the threshing and separation units used in our study.…”

Section: Grain Re-threshing and Re-separation Performance Of Lfc Unitsupporting

confidence: 74%

Modeling and design of a combined transverse and axial flow threshing unit for rice harvesters

Tang

et al. 2014

Span. j. agric. res.

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The thorough investigation of both grain threshing and grain separating processes is a crucial consideration for effective structural design and variable optimization of the tangential flow threshing cylinder and longitudinal axial flow threshing cylinder composite units (TLFC unit) of small and medium-sized (SME) combine harvesters. The objective of this paper was to obtain the structural variables of a TLFC unit by theoretical modeling and experimentation on a tangential flow threshing cylinder unit (TFC unit) and longitudinal axial flow threshing cylinder unit (LFC unit). Threshing and separation equations for five types of threshing teeth (knife bar, trapezoidal tooth, spike tooth, rasp bar, and rectangular bar), were obtained using probability theory. Results demonstrate that the threshing and separation capacity of the knife bar TFC unit was stronger than the other threshing teeth. The length of the LFC unit was divided into four sections, with helical blades on the first section (0-0.17 m), the spike tooth on the second section (0.17-1.48 m), the trapezoidal tooth on the third section (1.48-2.91 m), and the discharge plate on the fourth section (2.91-3.35 m). Test results showed an un-threshed grain rate of 0.243%, un-separated grain rate of 0.346%, and broken grain rate of 0.184%. Evidenced by these results, threshing and separation performance is significantly improved by analyzing and optimizing the structure and variables of a TLFC unit. The results of this research can be used to successfully design the TLFC unit of small and medium-sized (SME) combine harvesters.

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Section: Grain Re-threshing and Re-separation Performance Of Lfc Unitsupporting

confidence: 74%

Modeling and design of a combined transverse and axial flow threshing unit for rice harvesters

Tang

et al. 2014

Span. j. agric. res.

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“…The transient (implicit scheme) analysis. Based on the results of transient analysis, we obtain the following data: dependence of the maximum pressure on time, the values of average flow velocities, the spectral analysis of the broadband noise, the graphs of the All the existing variety of drum-type threshing machines for combine harvesters can be generalized in terms of their drum diameter D = 600-660 mm (John Deer, Deutz-Fahr) and D = 750-800 mm (New Holland, PCM), drum rotation frequency 300-1250 rpm and their drum length L = 1200-1600 mm [9][10][11][12][13][14][15].…”

Section: Decisionmentioning

confidence: 99%

Acoustic pressure contributions of a combine harvester’s thresher drum to the overall workplace noise situation

Stepanov¹,

Kireev

Korchagina

2020

E3S Web Conf.

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This paper analyzes the magnitude of the acoustic pressure contribution of a combine harvester’s thresher drum to the overall noise situation with the goal of providing the regulatory parameters for the workplace conditions. In the course of the current research the velocity and pressure graphics for the airflow on the parts of a rotating thresher drum as well as the sound intensity parameters by frequency spectra and sound pressure magnitudes were calculated.

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“…A threshing and transmission device is the key component of plot breeding harvesting machinery, also the key element that discriminates plot breeding harvesting machinery from field harvesting machinery, since it directly affects the success of seed breeding [5][6][7] . Seed retention within the threshing and transmission device has been the focus and difficulty that has not been completely solved in the research field.…”

Section: Introduction mentioning

confidence: 99%

Motion simulation and test on threshed grains in tapered threshing and transmission device for plot wheat breeding based on CFD-DEM

Dai

Song

Zhao

et al. 2019

International Journal of Agricultural and Biological Engineering

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Mechanization of field experiments is the only way to improve crop breeding and seed propagation effects. In order to further clarify and improve the working performance of tapered threshing device for plot breeding, and reduce the remaining seeds in the device, the numerical simulation was carried out on the motion process of materials in the longitudinal-axial tapered cylinder threshing and transmission device of the plot wheat breeding combine harvester based on CFD-DEM method. Simulation results showed that, threshing and transmission of particles and short stalks at axial direction could be realized under the influence of air flow. Meanwhile, the material transference and distribution rule and stream field distribution rule of air flow in the threshing and transmission device were obtained, the variations of velocity and displacement of particles and short stalks with time were obtained; the motion trajectories and forms of particles in different types of retention were also studied. At rotating speed of 1300-1600 r/min for the tapered threshing cylinder in the verification test, the particle retention rate in the enclosure was 0-0.13%, while in the simulation the particle retention rate in the enclosure was 0-0.11%, only a 0.02% difference between them. The results proved a favorable feasibility to simulate the working performance of the tapered threshing and transmission device for plot breeding through gas-solid coupling method.

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Modeling and simulation of grain threshing and separation in axial threshing units

Cited by 41 publications

References 2 publications

Modeling and design of a combined transverse and axial flow threshing unit for rice harvesters

Modeling and design of a combined transverse and axial flow threshing unit for rice harvesters

Acoustic pressure contributions of a combine harvester’s thresher drum to the overall workplace noise situation

Motion simulation and test on threshed grains in tapered threshing and transmission device for plot wheat breeding based on CFD-DEM

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