Effect of Seed Filling and Releasing Angles on the Performance of Compound Vacuum Seed Metering Device

Liu, Zeqi; Zhang, Meng; Han, Jingti; Zhuang, Yajun; Yin, Xiang; Chen, Yulong

doi:10.35633/inmateh-65-16

Cited by 8 publications

(2 citation statements)

References 9 publications

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“…The ANOVA of the regression equation was carried out according to Table 4, and the results of the experiment were analyzed using Design Expert 13 to establish quadratic polynomial regression equations between the single grain rate Y 1 and missed sowing rate Y 0 , the test factor codes as shown in Equations ( 6) and (7), respectively [28]. R 2 is a crucial evaluation indicator for determining the linear fit of linear regression.…”

Section: Analysis Of Test Resultsmentioning

confidence: 99%

“…The flow field simulation sets the outer surface of the drum as the ambient pressure inlet, and the negative pressure shaft outlet as the static pressure outlet, the simplified model is shown in Figure 4 [26][27][28]. The negative pressure value is the difference between ambient and static pressure; the ambient pressure is the standard atmospheric pressure, 101,325 Pa.…”

Section: Seed Discharger Simulation Model and Parameter Settingsmentioning

confidence: 99%

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Simulation and Experimental Study of a Split High-Speed Precision Seeding System

Lü

et al. 2022

Agriculture

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According to the agronomic requirements of cotton precision seeding, the researchers designed a split seeding system to achieve high-speed precision seeding on the membrane. The 3D models used in the simulation process were created using Solidworks. They used the built-in Flow Simulation plug-in in SolidWorks to simulate the flow field in the drum and to grasp the air velocity and pressure changes. The CFD-DEM (computational fluid dynamics and discrete element method) coupling method was used to simulate the positive pressure airflow to transport the seeds, so as to grasp the movement of the seeds in the seed tube. EDEM (engineering discrete element modeling) was used to simulate the seeding process of the hole seeder, to understand the movement speed and trajectory of the seeds inside the hole seeder, and to analyze the reasons for missed seeding and reseeding. A three-factor, five-stage quadratic rotation orthogonal combination test was designed using Design-expert 13.0 software. This test evaluates the performance of a split seeding system by establishing a response surface for the seed rate, using the hole seeder speed, negative pressure, and hole diameter as test factors. The optimal parameter combination is obtained by optimizing the regression equation, which is further verified by bench tests. Under the hole seeding speed of 47.98 r/min, the negative pressure of 1.96 kPa and the hole diameter of 3.5 mm, the precision seeding system achieved a single seed rate of 90.9% and a missed seed rate of 4.3%. The verification test results are consistent with the optimization results, which meet the agronomic requirements of high-speed precision film seeding. This research provides a better technical solution for the application development of a precision seeder.

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Section: Analysis Of Test Resultsmentioning

confidence: 99%

Section: Seed Discharger Simulation Model and Parameter Settingsmentioning

confidence: 99%

Simulation and Experimental Study of a Split High-Speed Precision Seeding System

Lü

et al. 2022

Agriculture

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Design and Experiment on Seed-Guiding Tube of T-Groove Furrowing Device Based on Brachistochrone

Jin

Li-quan

et al. 2022

INMATEH

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The disorder flow of seeds caused by the collision in the seed-guiding tube is one of the important reasons for the reduction of seeding uniformity. For this problem, a seed-guiding tube with brachistochrone considering the influence of friction was presented in this paper. By analyzing kinetics and rotating the equation coordinate system, brachistochrone under the condition of friction was obtained and applied to the design of the structural parameters of the grain conductor of T-groove furrowing device, and a discrete element model of the grain conductor and wheat was established, thus single-factor simulation analysis and quadratic regression orthogonal rotation combination simulation tests were conducted to explore the optimal combination of parameters. The test results showed that the seed-guiding tube had a brachistochrone radius of 14.708 mm, a linear length of 500 mm and a working speed of 4 km/h, and the seed spacing offset dispersion degree and the seed lateral offset dispersion degree were 12.26 and 8.53 respectively, which had a high seeding uniformity. The results of the bench validation test showed that the coefficients of variation of the two test evaluation indexes between the bench test results and the virtual simulation results were 10.20% and 8.62% respectively, therefore the simulation results could be used for the optimization of the seed guide tube.

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Analysis of Vibration Characteristics for Rubbing Machine Based on Modal Test

YUE

Tian

Yin

et al. 2022

INMATEH

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Aiming at the problems of large vibrations and noise of a working stalk rubbing machine, this paper took the 9R-60 rubbing machine as the research object and used the B&K modal test system and the vibration test system to analyse the modal and no-load conditions of the whole machine. Through analysing modal test data, it was concluded that the first five natural frequencies of the machine were 95.262 Hz, 144.386 Hz, 288.198 Hz, 313.719 Hz and 326.140 Hz. The results showed that spindle rotation had a more significant effect on the vibration than the feed chain rotation; the maximum vibration acceleration occurred at the small motor frame at a spindle speed of 1700 r·min-1 and a feed chain speed of 0.65 m·s-1, which was 135.539 m·s-2. The distribution of the amplitude statistical characteristics of the vibration signals follows the normal distribution and belongs to the stationary random process. The vibration was a self-excited vibration of the rotating machinery caused by the rotation of the main shaft and a forced vibration excited by the rotation of the same shaft. The research provides a direction for further research on the vibration characteristics of the rubbing machine under load conditions, and provides a theoretical basis for the subsequent vibration reduction design.

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Effect of Seed Filling and Releasing Angles on the Performance of Compound Vacuum Seed Metering Device

Cited by 8 publications

References 9 publications

Simulation and Experimental Study of a Split High-Speed Precision Seeding System

Simulation and Experimental Study of a Split High-Speed Precision Seeding System

Design and Experiment on Seed-Guiding Tube of T-Groove Furrowing Device Based on Brachistochrone

Analysis of Vibration Characteristics for Rubbing Machine Based on Modal Test

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