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The main reason for the massive loss of rapeseed in mechanized harvesting is the mismatch between the harvester requirements and the pod shatter resistance and plant branching characteristics. Low pod resistance, entanglement caused by excessive branches, and inconsistent pod maturity are primary mismatch problems. However, studies on rape characteristics by integrating agricultural machinery and agronomy are limited. A total of 15 varieties were planted for research from 2016 to 2018. In this paper, the Two-Degree-of-Freedom (2-DOF) collision method was adopted to evaluate the pod shatter resistance taken from the field, and the plant agronomic characteristics and their correlation were investigated. In 2020, a screened variety of C6009 with higher shatter resistance and suitable plant features for mechanized harvesting was planted in large areas and harvested by machines for verification. The test results demonstrated that the compact plant varieties with high branches might be more favorable for yield and shatter resistance. The field harvest loss of the screened variety was significantly less than that of the control group. It provides a reliable reference for agronomic experts in terms of rape variety improvement and agricultural machinery experts regarding the optimization of rape harvesters.
Yiren Qing; Yaoming Li; Lizhang Xu; Zheng Ma. Screen Oilseed Rape (Brassica napus) Suitable for Low-Loss Mechanized Harvesting. Agriculture 2021, 11, 504 .
AMA StyleYiren Qing, Yaoming Li, Lizhang Xu, Zheng Ma. Screen Oilseed Rape (Brassica napus) Suitable for Low-Loss Mechanized Harvesting. Agriculture. 2021; 11 (6):504.
Chicago/Turabian StyleYiren Qing; Yaoming Li; Lizhang Xu; Zheng Ma. 2021. "Screen Oilseed Rape (Brassica napus) Suitable for Low-Loss Mechanized Harvesting." Agriculture 11, no. 6: 504.
Crops with branching characteristics, such as rapeseed, are difficult to harvest owing to their specific plant geometry. To solve this problem, an harvesting reel with improved tine trajectory, considering the reel working process and a function suitable for oilseed rape, is proposed in this study. The improved tine, of which angle can be continuously adjusted to adapt to the plant structure and meet the operating requirements of the reel in the stages of pushing the reel into the crops, feeding plants into the auger, and releasing the reel. The kinematics of the tine trajectory between the new and standard reels were calculated and a simulation comparative analysis was performed, which proved that the new reel satisfies the theoretical requirements. Single-factor field experiments were conducted for the two types of reels. The test results demonstrated that the proposed reel has a lower header loss rate and is significantly affected by the reel speed than the reel height or machine forward speed. According to the multivariate orthogonal results, the combination of optimal parameters with minimum loss rate yielded a reel rotational speed of 1.88 rad s−1, machine speed of 0.6 m s−1, and reel vertical height of 1100 mm. The actual loss rate was found to authentically decrease to 1.04% in the supplementary field test under this condition, which verified that the parameters are reasonable. This study combines experiments and trajectory analysis to explain the advantages of the improved reel and provide a new study direction of reducing rapeseed harvesting losses.
Yiren Qing; Yaoming Li; Yi Yang; Lizhang Xu; Zheng Ma. Development and experiments on reel with improved tine trajectory for harvesting oilseed rape. Biosystems Engineering 2021, 206, 19 -31.
AMA StyleYiren Qing, Yaoming Li, Yi Yang, Lizhang Xu, Zheng Ma. Development and experiments on reel with improved tine trajectory for harvesting oilseed rape. Biosystems Engineering. 2021; 206 ():19-31.
Chicago/Turabian StyleYiren Qing; Yaoming Li; Yi Yang; Lizhang Xu; Zheng Ma. 2021. "Development and experiments on reel with improved tine trajectory for harvesting oilseed rape." Biosystems Engineering 206, no. : 19-31.
Low pod resistance is a main reason for high oilseed rape loss in mechanized harvesting. To select varieties with high resistance, this study proposed a 2-degree-of-freedom collision method (2-DFCM) for pods. It was compared with the available ripping and shaker collision methods. The influences of various factors on pod resistance were discussed, and the characteristics of the pods of whole plants were compared and analysed. The results demonstrated that the 2-DFCM results are more reliable based on pod resistance. Field pod resistances were found to be significantly lower than after the indoor equilibration of unripe plants to the same water content, and 2-DFCM is convenient for field testing and accurately identifies pod characteristics. The pericarp, thousand-seed weight, pod thickness and volume, and plant branch height were found to be significantly correlated with pod resistance, which can be strengthened by breeding. The varieties and pod growth positions significantly affected resistance. For field pods, the branch pod resistance was significantly higher than that of the main inflorescence, and the top pod of the raceme had the lowest resistance. The results of this paper provide a reliable reference for agronomic experts to improve oilseed rape varieties.
Yiren Qing; Yaoming Li; Lizhang Xu; Zheng Ma; Xiaoli Tan; Zheng Wang. Oilseed rape (Brassica napus L.) pod shatter resistance and its relationship with whole plant and pod characteristics. Industrial Crops and Products 2021, 166, 113459 .
AMA StyleYiren Qing, Yaoming Li, Lizhang Xu, Zheng Ma, Xiaoli Tan, Zheng Wang. Oilseed rape (Brassica napus L.) pod shatter resistance and its relationship with whole plant and pod characteristics. Industrial Crops and Products. 2021; 166 ():113459.
Chicago/Turabian StyleYiren Qing; Yaoming Li; Lizhang Xu; Zheng Ma; Xiaoli Tan; Zheng Wang. 2021. "Oilseed rape (Brassica napus L.) pod shatter resistance and its relationship with whole plant and pod characteristics." Industrial Crops and Products 166, no. : 113459.
The grouser height and soil conditions have a considerable influence on the tractive performance of single-track shoe. A soil bin-based research was conducted to assess the influence of grouser height on the tractive performance of single-track shoe at different moisture contents of clay loam soil. Eight moisture contents (7.5, 12, 16.7, 21.5, 26.2, 30.7, 35.8, and 38%) and three grouser heights (45, 55, and 60 mm) were comprised during this study. The tractive performance parameters of (thrust, running resistance, and traction) were determined by penetration test. A sensor-based soil bin was designed for penetration tests, which was included penetration system (AC motor, loadcell, and displacement sensor). The test results revealed that soil cohesion was decreased, and adhesion was increased after 16.7% moisture content. Soil thrust at lateral sides and bottom of grouser were increased before 16.7%, and then decreased for all the three heights but the major decrease was observed at 45 mm height. The motion resistance was linearly decreased, the more reduction was on 45 mm at 38% moisture content. The traction of the single-track shoe was decreased with a rise in moisture content, the maximum decrease was on 45 mm grouser height at 38% moisture content. It could be concluded that an off-road tracked vehicle (crawler combine harvester) with 45 mm grouser height of single-track shoe could be operated towards a moderate moisture content range (16.7–21.5%) under paddy soil for better traction.
Sher Shaikh; Yaoming Li; Ma Zheng; Farman Chandio; Fiaz Ahmad; Mazhar Tunio; Irfan Abbas. Effect of Grouser Height on the Tractive Performance of Single Grouser Shoe under Different Soil Moisture Contents in Clay Loam Terrain. Sustainability 2021, 13, 1156 .
AMA StyleSher Shaikh, Yaoming Li, Ma Zheng, Farman Chandio, Fiaz Ahmad, Mazhar Tunio, Irfan Abbas. Effect of Grouser Height on the Tractive Performance of Single Grouser Shoe under Different Soil Moisture Contents in Clay Loam Terrain. Sustainability. 2021; 13 (3):1156.
Chicago/Turabian StyleSher Shaikh; Yaoming Li; Ma Zheng; Farman Chandio; Fiaz Ahmad; Mazhar Tunio; Irfan Abbas. 2021. "Effect of Grouser Height on the Tractive Performance of Single Grouser Shoe under Different Soil Moisture Contents in Clay Loam Terrain." Sustainability 13, no. 3: 1156.
One of the most important means of improving the mechanization of rapeseed harvests and increasing farmers’ income is to reduce the cleaning loss of rapeseed. In this study, a fuzzy grey control system was developed using an assembled cleaning loss sensor. Based on experimental data, the relationship between the cleaning loss and the opening of the louver sieve in the cleaning device was obtained. The fuzzy control scheme was established by combining grey prediction and the fuzzy control principle. Secondly, a microcontroller unit (MCU) was used as the controller, and the opening of the louver sieve was automatically regulated by detecting the signal of the cleaning loss. Finally, the performance and robustness of the control system was evaluated in field tests. Different experiments were conducted under different speed conditions to reflect the variable throughput. Results showed that using the grey prediction control system can realize the adjustment of the louver sieve opening in real time. The cleaning loss could be maintained within the ideal setpoint interval, compared with the operation with the control system switched off. These findings indicate that the application of the grey fuzzy control system reduces cleaning loss, and the nonlinear, time-variable and time delay problems in cleaning devices can be solved effectively.
Xiaoyu Chai; Lizhang Xu; Yang Li; Jie Qiu; Yaoming Li; Liya Lv; Yahui Zhu. Development and Experimental Analysis of a Fuzzy Grey Control System on Rapeseed Cleaning Loss. Electronics 2020, 9, 1764 .
AMA StyleXiaoyu Chai, Lizhang Xu, Yang Li, Jie Qiu, Yaoming Li, Liya Lv, Yahui Zhu. Development and Experimental Analysis of a Fuzzy Grey Control System on Rapeseed Cleaning Loss. Electronics. 2020; 9 (11):1764.
Chicago/Turabian StyleXiaoyu Chai; Lizhang Xu; Yang Li; Jie Qiu; Yaoming Li; Liya Lv; Yahui Zhu. 2020. "Development and Experimental Analysis of a Fuzzy Grey Control System on Rapeseed Cleaning Loss." Electronics 9, no. 11: 1764.
The transverse distribution of the threshed material in a typical tangential-longitudinal flow combine harvester is uneven and this is likely to cause local accumulation of materials on the cleaning screen. Cleaning performance and efficiency reducing problems are easily caused. In this study, discrete element simulation was applied. The distribution position of the guide strips on the threshed outputs distribution was analysed. The threshing outputs under threshing cylinder were divided into seven sections, with the total making up the threshing ration. Using the standard deviation of threshing ratio as an evaluation criterion, the optimal structural parameters of the distribution devices were obtained. In order to verify parameter accuracy, field tests were carried out to monitor the threshed outputs distribution along the transverse direction on the cleaning screen. The cleaning loss rate was analysed statistically. It was concluded that the cleaning performance of tangential-longitudinal-flow combine harvester was increased by the automatic distributing system; including threshed outputs, lateral distribution evenness along cleaning shoe was improved and local accumulation was reduced. The adaptive system decreased the criterion used for evaluation by 42%. Under a 1 m s−1 working condition, cleaning loss decreased by 71.67%, and under a 1.5 m s−1 working condition, the cleaning loss decreased by 50%.
Xiaoyu Chai; Ying Zhou; Lizhang Xu; Yang Li; Yaoming Li; Liya Lv. Effect of guide strips on the distribution of threshed outputs and cleaning losses for a tangential-longitudinal flow rice combine harvester. Biosystems Engineering 2020, 198, 223 -234.
AMA StyleXiaoyu Chai, Ying Zhou, Lizhang Xu, Yang Li, Yaoming Li, Liya Lv. Effect of guide strips on the distribution of threshed outputs and cleaning losses for a tangential-longitudinal flow rice combine harvester. Biosystems Engineering. 2020; 198 ():223-234.
Chicago/Turabian StyleXiaoyu Chai; Ying Zhou; Lizhang Xu; Yang Li; Yaoming Li; Liya Lv. 2020. "Effect of guide strips on the distribution of threshed outputs and cleaning losses for a tangential-longitudinal flow rice combine harvester." Biosystems Engineering 198, no. : 223-234.
The gap between concave grid and drum, the threshing gap, is one of the important operating parameters that affects the performance of threshing devices. The different methods currently adopted on combine harvesters to adjust both the drum and the concave, results in concentric and non-concentric threshing gaps that have different influence on e threshing performance. The threshing process is complex, therefore, in order to analyse the influence of the threshing gap on performance, flexible rice straw models were built using the discrete element method to simulate the threshing processes of the two adjustment methods. Their respective movements, separation status and the distribution of the mixture of the threshed output were examined. Simulation results indicated that over the same time, drum adjustment produced better material separation and transportation capabilities and more evenly distributed output mixture in the reception box, compared with the concave adjustment. A threshing experiment on a combine harvester was performed in order to verify the simulation result and the output mixture distribution status was found to be consistent with the results of the simulations. The experimental results showed that threshing was more effectively improved by changing the threshing drum diameter although the threshing gap was more complicated to adjust.
Zhan Su; Yaoming Li; Yunhua Dong; Zhong Tang; Zhenwei Liang. Simulation of rice threshing performance with concentric and non-concentric threshing gaps. Biosystems Engineering 2020, 197, 270 -284.
AMA StyleZhan Su, Yaoming Li, Yunhua Dong, Zhong Tang, Zhenwei Liang. Simulation of rice threshing performance with concentric and non-concentric threshing gaps. Biosystems Engineering. 2020; 197 ():270-284.
Chicago/Turabian StyleZhan Su; Yaoming Li; Yunhua Dong; Zhong Tang; Zhenwei Liang. 2020. "Simulation of rice threshing performance with concentric and non-concentric threshing gaps." Biosystems Engineering 197, no. : 270-284.
Harvesting main crop rice with a wide header at a required height can increase its ratoon crop yield by decreasing the stubble rolling rate. However, an increased harvest width brings in more input material in a specific time, causing the size enlargement or working speed slowdown of harvesters. To solve this issue, a double-cutterbar structure was proposed. To provide a design baseline for the structure, the cutterbar configuration methods based on rice plant deformation were developed and verified, stalk shearing tests were conducted, and a double-cutterbar prototype was fabricated and tested. The results indicated that the methods developed for the configuration of the upper and lower cutterbars could considerably implement their functions of lowering the straw-grain ratio and keeping stubble height as required. The shearing tests indicated that the bevel angle significantly influenced the total shearing energy on each cutting point in Internode 2 and 3 (p < 0.05) due to the increased stalk cross sectional area. The stubble rolling rate, panicle straw length and stubble height of the developed harvester were 26.9 %, 125 ± 80 mm and 332 ± 22 mm, respectively, which could meet the requirements of main crop rice harvesting. The outcomes indicated the functionality and practicability of the double-cutterbar structure developed based on rice plant deformation and shearing properties.
Mingsen Huang; Yaoming Li; Anya Chen; Lizhang Xu. Design and Test of Double-Cutterbar Structure on Wide Header for Main Crop Rice Harvesting. Applied Sciences 2020, 10, 4432 .
AMA StyleMingsen Huang, Yaoming Li, Anya Chen, Lizhang Xu. Design and Test of Double-Cutterbar Structure on Wide Header for Main Crop Rice Harvesting. Applied Sciences. 2020; 10 (13):4432.
Chicago/Turabian StyleMingsen Huang; Yaoming Li; Anya Chen; Lizhang Xu. 2020. "Design and Test of Double-Cutterbar Structure on Wide Header for Main Crop Rice Harvesting." Applied Sciences 10, no. 13: 4432.
The cleaning of rice on a combine harvester is a complex process, which leads to differences in impurity ratio of harvested grain, and the impurity ratio is one of the key criteria for the assessment of performance of a combine harvester. Combine operators usually optimize parameter settings only once for harvesting each crop because of time pressure, and therefore differences in site- and temporal-specific conditions are neglected. In this paper, to offer combine operators the opportunity to make better management decision, a machine vision method for grain impurity monitoring of a rice combine harvester in real time was proposed, and the classification of kernel and impurity particles using decision tree algorithm was presented. To obtain images of high quality during harvesting, the structure of the sampling device depending on the working properties in grain bin was designed, the illumination and installation of the light source were optimized, and finally lateral lighting system was constructed. To monitor and recognize grains and impurities, the morphological features of the particles extracted from the images were acquired. The selected 6 features (A1-A6), including area, perimeter, maximal feret diameter, elongation factor, compactness factor and Heywood circularity factor, were fed to the decision tree algorithm for classification. Output of the algorithm, a visualized tree, was used to classify the particles labeled in the binary image. The decision tree provided a classification accuracy of about 76% for the given training data set extracted from the captured images. From the experimental results, it is suggested that the method of monitoring the impurity ratio of harvested grains based on decision tree algorithm using image processing can be recommended as the basis of parameter optimization of combine harvesters.
Jin Chen; Yi Lian; Yaoming Li. Real-time grain impurity sensing for rice combine harvesters using image processing and decision-tree algorithm. Computers and Electronics in Agriculture 2020, 175, 105591 .
AMA StyleJin Chen, Yi Lian, Yaoming Li. Real-time grain impurity sensing for rice combine harvesters using image processing and decision-tree algorithm. Computers and Electronics in Agriculture. 2020; 175 ():105591.
Chicago/Turabian StyleJin Chen; Yi Lian; Yaoming Li. 2020. "Real-time grain impurity sensing for rice combine harvesters using image processing and decision-tree algorithm." Computers and Electronics in Agriculture 175, no. : 105591.
Leaf fragments and grain mixture produced by rice threshing with a combine harvester seriously affects the subsequent grain cleaning efficiency. In this paper, rice leaf breaking force was tested at different temperatures and moisture contents to analyze the influence of temperature on the tensile properties of rice leaves. The overlapping regions of rice leaf breaking force and grain separation force at different temperatures were obtained. Based on the rice leaf breaking force, the effect of the temperature change on rice leaf with different moisture content was analyzed. The results showed that tensile strength of rice leaf decreased first, then increased and finally decreased from rice sheath to the top. The tensile breaking force of the leaf sheath was about 75 N (N is Newton, 1 N = 1 kg·m/s²). The tensile fracture resistance of rice leaf was shown to weaken with the increase of temperature. The influence of the moisture content on the mechanical properties of rice leaf during the process of temperature change was small. At 30 to 35 °C, the blade was the strongest tensile fracture resistance, which was the lowest probability of fracture under the same stress condition. At this time, the rice grain separation force has the least coincidence with the rice leaf resistance to breakage. According to the breaking force of different blade layers, the number of blade layers has a significant linear relationship with its tensile limit. Therefore, the overall fracture resistance of the multilayer blade can be improved by controlling the temperature and moisture content.
Zhong Tang; Yu Li; Ben Zhang; Meilin Wang; Yaoming Li. Controlling Rice Leaf Breaking Force by Temperature and Moisture Content to Reduce Breakage. Agronomy 2020, 10, 628 .
AMA StyleZhong Tang, Yu Li, Ben Zhang, Meilin Wang, Yaoming Li. Controlling Rice Leaf Breaking Force by Temperature and Moisture Content to Reduce Breakage. Agronomy. 2020; 10 (5):628.
Chicago/Turabian StyleZhong Tang; Yu Li; Ben Zhang; Meilin Wang; Yaoming Li. 2020. "Controlling Rice Leaf Breaking Force by Temperature and Moisture Content to Reduce Breakage." Agronomy 10, no. 5: 628.
To reduce the variability of cleaning performance caused by uneven airflow distribution, the theory of fan design and the characteristic parameters of threshed rice outputs were used to develop a prototype of cleaning fan. Computational Fluid Dynamics (CFD) was employed to simulate the air distribution inside the fan and the airflow speed distribution at the fan outlet. Response surface methodology (RSM) with three factors and three levels was employed to optimise fan impeller geometry parameters, this included blade inlet mounting angle, blade curvature and blade inlet curvature. According to the least squares analysis of RSM, the influence of each factor on the airflow distribution at each sub-outlet was estimated. The optimal values of blade inlet mounting angle, blade curvature and blade inlet curvature were 107°, 190 mm and 135 mm, respectively. The uniformity of the outlet airflow distribution of the optimised fan was clearly improved. The number of eddy currents in the flow passage were reduced, and the transporting performance of optimised fan was improved. The maximum pressure at 5% blade height away from the central plate was reduced by 37.78%, which indicates that the service life of the cleaning fan could be increased.
Xiaoyu Chai; Lizhang Xu; Yixin Sun; Zhenwei Liang; En Lu; Yaoming Li. Development of a cleaning fan for a rice combine harvester using computational fluid dynamics and response surface methodology to optimise outlet airflow distribution. Biosystems Engineering 2020, 192, 232 -244.
AMA StyleXiaoyu Chai, Lizhang Xu, Yixin Sun, Zhenwei Liang, En Lu, Yaoming Li. Development of a cleaning fan for a rice combine harvester using computational fluid dynamics and response surface methodology to optimise outlet airflow distribution. Biosystems Engineering. 2020; 192 ():232-244.
Chicago/Turabian StyleXiaoyu Chai; Lizhang Xu; Yixin Sun; Zhenwei Liang; En Lu; Yaoming Li. 2020. "Development of a cleaning fan for a rice combine harvester using computational fluid dynamics and response surface methodology to optimise outlet airflow distribution." Biosystems Engineering 192, no. : 232-244.
This paper deals with the numerical calculation method of deflection deformation of rice stalks. Due to large deflection of rice stalks caused by reel operation, it is improper to adopt the conventional formula that is usually used in small deflection calculation to fit rice stalk deformation curves. Therefore, a large deflection calculation formula in combination with Simpson’s formula was utilized to compute flexural rigidity (EI) and to fit curves. The experiments were conducted under different loads (0.03, 0.04, 0.05, 0.06, and 0.07 N) on a self-established deflection testing rig to verify this method. As a result, the measured results corresponded considerably to ones predicted by this method; furthermore, the flexural rigidity was maintained at a stable level under different loads. This study can provide the basis for establishing a complete deformation model of rice plant and can also be applied in deflection calculation of other stalk crops.
Mingsen Huang; Yaoming Li; Anya Chen; Lizhang Xu. Numerical Calculation Method of Deflection Deformation of Rice Stalk. Applied Sciences 2019, 9, 3125 .
AMA StyleMingsen Huang, Yaoming Li, Anya Chen, Lizhang Xu. Numerical Calculation Method of Deflection Deformation of Rice Stalk. Applied Sciences. 2019; 9 (15):3125.
Chicago/Turabian StyleMingsen Huang; Yaoming Li; Anya Chen; Lizhang Xu. 2019. "Numerical Calculation Method of Deflection Deformation of Rice Stalk." Applied Sciences 9, no. 15: 3125.
Rice is one of the most important grain crops in China and most of these fields are harvested by combine harvesters. With increasing rice grain yields and feed rates, the cleaning systems rice combine harvesters have to deal with larger volumes of threshed output. Field experiments have shown that the standard single-duct cleaning systems used in most rice combine harvesters has become a limiting factor, resulting in high grain losses and producing high grain impurity ratios. To investigate the reasons for poor cleaning performance, the terminal velocity of the different categories of threshed outputs were quantified and turbine flow meter measurements were performed to obtain insights into the airflow distribution inside the cleaning shoe. Based on these insights, a multi-duct cleaning device with return pan was proposed for tangential-longitudinal-flow rice combine harvesters. The new cleaning system was benchmarked against a commercial system during parallel field tests and it was concluded that the design adaptations improved the sieve losses by 85% and the grain impurity ration by 73%.
Zhenwei Liang; Yaoming Li; Josse De Baerdemaeker; Lizhang Xu; Wouter Saeys. Development and testing of a multi-duct cleaning device for tangential-longitudinal flow rice combine harvesters. Biosystems Engineering 2019, 182, 95 -106.
AMA StyleZhenwei Liang, Yaoming Li, Josse De Baerdemaeker, Lizhang Xu, Wouter Saeys. Development and testing of a multi-duct cleaning device for tangential-longitudinal flow rice combine harvesters. Biosystems Engineering. 2019; 182 ():95-106.
Chicago/Turabian StyleZhenwei Liang; Yaoming Li; Josse De Baerdemaeker; Lizhang Xu; Wouter Saeys. 2019. "Development and testing of a multi-duct cleaning device for tangential-longitudinal flow rice combine harvesters." Biosystems Engineering 182, no. : 95-106.
The influences of throughput and operating parameters on internal airflow and cleaning performance for the air-and-screen cleaning unit were investigated. The throughput experiment showed that, the airflow velocities above the vibrating screen decreased by 1.3–15.5% for every 1.0 kg s−1 increase of throughput and which below the vibrating screen decreased by 2.7–8.1%. As a result, the cleaning performance has declined. Then, the airflow velocity measurement and cleaning performance tests were taken under 4.0 kg s−1 throughput with single factor experiment in which fan speed, airflow deflector angle and sieve opening were as factors. And, the Computed Fluid Dynamic (CFD) numerical simulations were carried out to analyze the movement trend of internal airflow as an auxiliary analysis method. The following viewpoints were obtained, the fan speed has a large effect on cleaning performance by affecting the overall airflow velocities in the cleaning unit. And, the airflow velocities above the vibrating screen increased from 0.2 m s−1 to 0.4 m s−1 for every 150 r min−1 increase of fan speed, which below the vibrating screen increased from 0.4 m s−1 to 1.1 m s−1; The highest airflow velocities area above the vibrating screen moved forward to the central position in the longitudinal direction as the airflow deflector angle increased; With the reduction for each 4 mm of chaffer opening, the airflow velocities above the vibrating screen increased by 0.2–0.4 m s−1. At last, making mathematical relations between each operating parameter and the cleaning performance, and proposing the method of adjusting the single operating parameter under rated condition according to the throughput. They provide a basis for real-time automatic adjustment of the operating parameters in the air-and-screen cleaning unit.
Yang Li; Lizhang Xu; Ying Zhou; Baijun Li; Zhenwei Liang; Yaoming Li. Effects of throughput and operating parameters on cleaning performance in air-and-screen cleaning unit: A computational and experimental study. Computers and Electronics in Agriculture 2018, 152, 141 -148.
AMA StyleYang Li, Lizhang Xu, Ying Zhou, Baijun Li, Zhenwei Liang, Yaoming Li. Effects of throughput and operating parameters on cleaning performance in air-and-screen cleaning unit: A computational and experimental study. Computers and Electronics in Agriculture. 2018; 152 ():141-148.
Chicago/Turabian StyleYang Li; Lizhang Xu; Ying Zhou; Baijun Li; Zhenwei Liang; Yaoming Li. 2018. "Effects of throughput and operating parameters on cleaning performance in air-and-screen cleaning unit: A computational and experimental study." Computers and Electronics in Agriculture 152, no. : 141-148.
Grain separation losses is a key parameter to weigh the performance of combine harvesters, and also a dominant factor for automatically adjusting their major working parameters. The traditional separation losses monitoring method mainly rely on manual efforts, which require a high labor intensity. With recent advancements in sensor technology, electronics and computational processing power, this paper presents an indirect method for monitoring grain separation losses in tangential-axial combine harvesters in real-time. Firstly, we developed a mathematical monitoring model based on detailed comparative data analysis of different feeding quantities. Then, we developed a grain impact piezoelectric sensor utilizing a YT-5 piezoelectric ceramic as the sensing element, and a signal process circuit designed according to differences in voltage amplitude and rise time of collision signals. To improve the sensor performance, theoretical analysis was performed from a structural vibration point of view, and the optimal sensor structural has been selected. Grain collide experiments have shown that the sensor performance was greatly improved. Finally, we installed the sensor on a tangential-longitudinal axial combine harvester, and grain separation losses monitoring experiments were carried out in North China, which results have shown that the monitoring method was feasible, and the biggest measurement relative error was 4.63% when harvesting rice.
Zhenwei Liang; Yaoming Li; Zhan Zhao; Lizhang Xu. Structure Optimization of a Grain Impact Piezoelectric Sensor and Its Application for Monitoring Separation Losses on Tangential-Axial Combine Harvesters. Sensors 2015, 15, 1496 -1517.
AMA StyleZhenwei Liang, Yaoming Li, Zhan Zhao, Lizhang Xu. Structure Optimization of a Grain Impact Piezoelectric Sensor and Its Application for Monitoring Separation Losses on Tangential-Axial Combine Harvesters. Sensors. 2015; 15 (1):1496-1517.
Chicago/Turabian StyleZhenwei Liang; Yaoming Li; Zhan Zhao; Lizhang Xu. 2015. "Structure Optimization of a Grain Impact Piezoelectric Sensor and Its Application for Monitoring Separation Losses on Tangential-Axial Combine Harvesters." Sensors 15, no. 1: 1496-1517.