Modeling and simulation of grain threshing and separation in threshing units—Part I

Miu, Petre I.; Kutzbach, Heinz Dieter

doi:10.1016/j.compag.2007.07.003

Cited by 83 publications

(47 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The equations of y and z were also obtained. The equation structure of y and z were in accordance with previous studies conducted by Miu & Kutzbach (2008a), but the specific expressions were dissimilar. This could be due to the differing characteristics and variables of the threshing and separation unit used in our study.…”

Section: Discussionsupporting

confidence: 84%

“…The total grain rate in the LFC unit is then q j , described as: [17] Assuming that δx is an arbitrary infinitely small distance, which is one point of the LFC, λ is the re-threshed coefficient, and β is the re-separated coefficient; i and j are natural numbers (i = 0, 1, 2, 3…; j = 1, 2, 3,…). Threshed grain probability density f(x) is as described by Miu & Kutzbach (2000, 2008a. We then obtain:…”

Section: Grain Threshing and Separation Model Of Lfc Unitmentioning

confidence: 99%

See 1 more Smart Citation

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

Tang

et al. 2014

Span. j. agric. res.

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionsupporting

confidence: 84%

Section: Grain Threshing and Separation Model Of Lfc Unitmentioning

confidence: 99%

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

Tang

et al. 2014

Span. j. agric. res.

View full text Add to dashboard Cite

show abstract

“…The content of impurities in the grain was lower by 0.94% and the difference in fuel consumption was negligible. With the axial threshing-separation mechanism less grain losses were obtained when compared with the straw walker (Rademacher 2003;Miu, Kutzbach 2007), due to the fact, that the separation area of the axial mechanism is 2,4-times bigger than area of the threshing concave of the tangential threshing mechanism.…”

mentioning

confidence: 99%

The experimental research of combine harvesters

Špokas¹,

Adamčuk²,

Bulgakov³

et al. 2016

Res. Agric. Eng.

View full text Add to dashboard Cite

AbstractŠpokas L., Adamčuk V., Bulgakov V., Nozdrovický L. (2016): The experimental research of combine harvesters. Res. Agr. Eng., 62: 106-112.The paper presents results of the experimental research of a middle-size combine harvester when used for harvest of winter wheat and spring barley in heavy harvest conditions. Based on the results obtained, it was possible to determine the effect of field conditions on the crop mass flow in combine harvester, grain losses, fuel consumption, and combine harvester field performance. It was found that grain moisture content and conditions of the crop stand have a significant effect on the work indicators of the combine harvester when compared with its technological parameters and crop mass flow.Кeywords: grain losses; fuel consumption; combine harvester field performance As stated by Kutzbach and Quick (1999) the main processes in a modern harvester are gathering and cutting, threshing, separating, cleaning, and material handling. Currently, designers of the combine harvesters pay more attention to the improvement of the quality of control process, its automatic control, improve the trafficability of the chassis and the environment protection. They argue that an increase in engine power increases the throughput of the combine harvester. Engine power of the combine harvesters equipped with the classic straw walkers already exceeded 295k W/400 HP, and hybrid and axial -closer to 440 kW/600 HP (Srivastava et al. 2006). But the throughput of the combine harvester is associated not only with the power of the engine, and it is more closely connected with the separation deck area, straw walker and cleaning mechanism capacity.According to the FAO Report (FAO 2014) in Ukraine, the 2014 aggregate cereal production is estimated at about 61.9 million tonnes marginally below 2013 year's record level and around 25% above the five-year average. This output reflects near-record yields, following favourable weather conditions during the cropping season, which more than offset a slight contraction in the planted area compared to 106

show abstract

“…And straws were partially loaded on the tangential threshing cylinder. Unbalanced vibration was induced by partial load on tangential threshing cylinder [1]. Unbalanced vibration of tangential threshing cylinder resulted in increased grain loss, shortened cylinder life, and resonance of structure during the process of rice threshing [2].…”

Section: Introductionmentioning

confidence: 99%

Unbalanced Vibration Identification of Tangential Threshing Cylinder Induced by Rice Threshing Process

Tang

Zhang

Zhou

2018

Shock and Vibration

View full text Add to dashboard Cite

Unbalanced vibration of tangential threshing cylinder increased the grain loss, shortened service life of the cylinder, and resulted in structural resonance during the rice threshing process. In this paper, the vibration amplitude and frequency of tangential threshing cylinder shaft were tested, and the vibration state of tangential threshing cylinder was identified. The restricted and working modalities of tangential threshing cylinder were solved by ANSYS software. Then, by comparing the resonance phenomenon between the inherent constraint frequency and the rotation speed frequency, the shaft vibration under the idle condition of tangential threshing cylinder was tested and analyzed. According to the axial vibration and axial trajectory of the cylinder, the inherent properties and characteristics of unbalanced vibration were revealed. Test results showed that when the tangential threshing cylinder was at idling and no-load state, the amplitude of vibration in the feed direction of straw flow was -0.049~0.060 mm, and the average vibration amplitude was 0.013 mm. As rice flowed along the tangential threshing cylinder, the vibration amplitude slightly increased. The trend and phase of each trajectory were similar, although the amplitude of each trajectory was different. The tangential threshing cylinder axis trajectory was flat oval. Unbalanced vibration was induced by the rice stalks in the concave gap.

show abstract

Modeling and simulation of grain threshing and separation in threshing units—Part I

Cited by 83 publications

References 4 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

The experimental research of combine harvesters

Unbalanced Vibration Identification of Tangential Threshing Cylinder Induced by Rice Threshing Process

Contact Info

Product

Resources

About