The precision seeding technique has been developed at full speed along with the continuous development of new agricultural technologies,especially those concerning cultivated patterns.The seed-metering device is the k...The precision seeding technique has been developed at full speed along with the continuous development of new agricultural technologies,especially those concerning cultivated patterns.The seed-metering device is the key component of a precision seeder.A ground wheel is used to drive the seed-metering device of the conventional direct seeder.However,the wheel bears high resistance and easily slips.Moreover,the adjustment of the precision seeder’s seeding rate is more difficult.In order to solve these problems,a control system which could keep the rotational speed of the seed-metering device consistent with the seeder’s working speed for the precision seed-metering device was designed.The control system includes a Hall sensor,a single chip microcomputer system,a motor control module,a stepper motor and a display.The control system used a Hall sensor to measure the seeder’s working speed and employed a single chip microcomputer system to predict the rotational speed of seed-metering device.It would then determine the relationship between the seeder’s working speed and the rotational speed of the seed metering-device according to the seeder’s working state,distance between seeds and the requirement of sowing rate.The system could effectively reduce the influence of inhomogeneous sowing caused by the ground wheel’s slipping.The system was found to be reliable by the experiment.The seeding control system could also make the speed of the seed-metering device and seeder’s uniform,improving the uniformity of the amount of seeding,and achieving the goal of design.This new design provides a platform to solve problems of the seed-metering device and the seeder.展开更多
Due to the influence of complex working environment and artificial factors,it is easy to cause crop up over or less tillage problem when straw returning machine is working in paddy field.A new method for path detectio...Due to the influence of complex working environment and artificial factors,it is easy to cause crop up over or less tillage problem when straw returning machine is working in paddy field.A new method for path detection suitable for rice,rape and wheat high crop stubble tilling environments was proposed.First the distribution characteristics of rice,rape and wheat high crop stubble images in paddy field based on RGB color model were analyzed,and rice,the color images of rape and wheat high crop stubble were converted into gray ones using custom factor combination R+G-2B;Then,the gray images of rice,rape and wheat high crop stubble were segmented from soil background by means of luminance mean texture descriptor;Next,the binary image through custom shear-binary-image algorithm was cut to remove big noise blobs in high crop stubble’s tilled area;Finally,navigation path from navigation points by using the least square method was derived.The experimental results indicated that the navigation path detection algorithm was fast and effective to obtain navigation path in rice,rape and wheat high crop stubble tilling environments with up to 96.7% of segmentation accuracy within 0.6 s of processing time.展开更多
基金This work was financially supported by the Special Fund for Agro-scientific Research in the Public Interest(No.201203059)the Natural Science Foundation of China(No.51275196)+1 种基金the Fundamental Research Funds for the Central Universities(No.2012ZYTS022)and the National Key Technology R&D Program(No.2011BAD20B08).
文摘The precision seeding technique has been developed at full speed along with the continuous development of new agricultural technologies,especially those concerning cultivated patterns.The seed-metering device is the key component of a precision seeder.A ground wheel is used to drive the seed-metering device of the conventional direct seeder.However,the wheel bears high resistance and easily slips.Moreover,the adjustment of the precision seeder’s seeding rate is more difficult.In order to solve these problems,a control system which could keep the rotational speed of the seed-metering device consistent with the seeder’s working speed for the precision seed-metering device was designed.The control system includes a Hall sensor,a single chip microcomputer system,a motor control module,a stepper motor and a display.The control system used a Hall sensor to measure the seeder’s working speed and employed a single chip microcomputer system to predict the rotational speed of seed-metering device.It would then determine the relationship between the seeder’s working speed and the rotational speed of the seed metering-device according to the seeder’s working state,distance between seeds and the requirement of sowing rate.The system could effectively reduce the influence of inhomogeneous sowing caused by the ground wheel’s slipping.The system was found to be reliable by the experiment.The seeding control system could also make the speed of the seed-metering device and seeder’s uniform,improving the uniformity of the amount of seeding,and achieving the goal of design.This new design provides a platform to solve problems of the seed-metering device and the seeder.
基金financially supported by the Special Fund for Agro-scientific Research in the Public Interest(No.201203059)the Natural Science Foundation of China(No.51275196).
文摘Due to the influence of complex working environment and artificial factors,it is easy to cause crop up over or less tillage problem when straw returning machine is working in paddy field.A new method for path detection suitable for rice,rape and wheat high crop stubble tilling environments was proposed.First the distribution characteristics of rice,rape and wheat high crop stubble images in paddy field based on RGB color model were analyzed,and rice,the color images of rape and wheat high crop stubble were converted into gray ones using custom factor combination R+G-2B;Then,the gray images of rice,rape and wheat high crop stubble were segmented from soil background by means of luminance mean texture descriptor;Next,the binary image through custom shear-binary-image algorithm was cut to remove big noise blobs in high crop stubble’s tilled area;Finally,navigation path from navigation points by using the least square method was derived.The experimental results indicated that the navigation path detection algorithm was fast and effective to obtain navigation path in rice,rape and wheat high crop stubble tilling environments with up to 96.7% of segmentation accuracy within 0.6 s of processing time.
