Monitoring method of rice seeds mass in vibrating tray for vacuum-panel precision seeder

According to the physical properties of rice seeds, triaxial ellipsoidal particle models were established based on the multi-sphere approach, and simulations of seeds motion in a vibrating tray were performed using the discrete element method (DEM). It was shown that the normal impact force Fn of seeds action on the tray was mainly composed of transient impact and accumulation force sections. The value of transient impact force was not stable because it was influenced comprehensively by shape of seed, vibration parameter and seeds-mass-per-unit-area (SMA). The variation of accumulation force determined by impulse change of seeds was relatively stable. Simulation results indicated that its value was almost linearly varied with SMA under a certain vibration parameter, and a real-time monitoring method of seeds mass in a vibrating tray is presented in this paper. Two cantilever force sensors were back-to-back fixed at the bottom of seed tray. Due to a phasic difference w existed between the vibration inertia force and the seeds normal impact force Fn, a differential operation was performed between the output signals of two sensors to eliminate the influence of inertia force and extract Fn effectively. Then, a signal processing circuit mainly composed of differential amplifier, active low-pass filter, bias voltage circuit, envelope detector, and passive low-pass filter in series was designed to detect seeds mass. Calibration tests were carried out in laboratory with vibration frequency f and amplitude A of tray in the ranges of 9–13 Hz and 3–5 mm, the results showed that the comprehensive measurement errors were <3.5% with SMA j in the range of 0.2–1.8 g/cm. 2015 Published by Elsevier B.V.

[1]  R. Kačianauskas,et al.  Investigation of adequacy of multi-sphere approximation of elliptical particles for DEM simulations , 2010 .

[2]  J. De Baerdemaeker,et al.  Discrete element modelling for process simulation in agriculture , 2003 .

[3]  Zhao Zhan Analysis and Research of a Precision Seeder Horizontal Adjustment Mechanism , 2012 .

[4]  A. Özmerzi,et al.  Mathematical Modelling of Vacuum Pressure on a Precision Seeder , 2004 .

[5]  Z. Barut Effect of Different Operating Parameters on Seed Holding in the Single Seed Metering Unit of a Pneumatic Planter , 2004 .

[6]  Istvan Oldal,et al.  Grain velocity distribution in a mixed flow dryer , 2012 .

[7]  Harald Kruggel-Emden,et al.  A study on the validity of the multi-sphere Discrete Element Method , 2008 .

[8]  R. Singh,et al.  Optimisation of Design and Operational Parameters of a Pneumatic Seed Metering Device for Planting Cottonseeds , 2005 .

[9]  He RuiYin,et al.  Comparison and analysis of different rice planting methods in China , 2008 .

[10]  Li Yaoming,et al.  Numerical analysis and laboratory testing of seed spacing uniformity performance for vacuum-cylinder precision seeder , 2010 .

[11]  Yaoming Li,et al.  Original papers: Grain separation loss monitoring system in combine harvester , 2011 .

[12]  Arzu Yazgi,et al.  Optimisation of the seed spacing uniformity performance of a vacuum-type precision seeder using response surface methodology , 2007 .

[13]  B. B. Gaikwad,et al.  Design of a low-cost pneumatic seeder for nursery plug trays , 2008 .

[14]  Chen Jin,et al.  Discrete element method simulation of seeds motion in vibrated bed of precision vacuum seeder. , 2009 .

[15]  H. Søgaard,et al.  Instrumentation and method for high accuracy geo-referencing of sugar beet plants , 2007 .

[16]  Runyu Yang,et al.  Discrete particle simulation of particulate systems: A review of major applications and findings , 2008 .

[17]  D. Karayel Performance of a modified precision vacuum seeder for no-till sowing of maize and soybean , 2009 .

[18]  H. Landry,et al.  Discrete element modeling of machine-manure interactions , 2006 .

[19]  J. Favier,et al.  Model for the deformation in agricultural and food particulate materials under bulk compressive loading using discrete element method. I: Theory, model development and validation , 2004 .

[20]  Herman Ramon,et al.  Simulation of grain-straw separation by Discrete Element Modeling with bendable straw particles , 2014 .

[21]  Guy T. Houlsby,et al.  A new algorithm for contact detection between convex polygonal and polyhedral particles in the discrete element method , 2012 .

[22]  Simone Pascuzzi,et al.  Experimental and Theoretical Performance of a Vacuum Seeder Nozzle for Vegetable Seeds , 1996 .