摘要
针对苏南地区油菜播种一体机作业过程中种子监测困难的问题,设计了一种基于PVDF双压电薄膜的油菜单粒精密播种机播种性能监测系统。系统通过播种机安装在测速轮上的编码器采集机具作业速度,结合设定的目标播量,得到理论排种间距,采用聚偏二氟乙烯(PVDF)压电薄膜监测装置,采集油菜种子落粒数。为了滤除机器振动信号干扰,设置参照压电薄膜,通过逻辑运算模块降低振动干扰,采用施密特电路迟滞原理消除比较器抖动干扰。系统采用STM32F103VBT6单片机作为中央处理器,结合设定的理论株距、相邻脉冲电压信号的时间间隔与播种机前进速度,计算得出播种量、排种速度、漏播率与重播率等性能指标。试验台试验表明,在26.5~42.2 r/min排种轴转速下,系统对排种量的检测精度不低于96.4%,漏播检测精度高于95.8%,重播检测精度高于98.4%;振动频率8~16 Hz条件下,系统播量检测精度高于95.2%。
In order to address the difficulty of monitoring small seeds during the operation of an integrated rape sowing machine in southern Jiangsu,a monitoring system for the sowing performance of a single seed precision seeder for rapeseed is designed based on PVDF bi-piezoelectric film.The system collects the operating speed of the machine through the encoder installed on the tachometer wheel of the seeder,and obtains the theoretical seeding spacing in combination with the set target seeding rate.The PVDF bi-piezoelectric film monitoring device is used to collect the number of rapeseeds.In order to filter the interference of machine vibration signal,a reference piezoelectric film is set up to eliminate vibration interference through logic operations,and the Schmitt circuit hysteresis principle is used to eliminate comparator jitter interference.The system uses the STM32F103VBT6 microcontroller as the central processor to calculate the performance indicators such as sowing volume,seeding speed,omission rate and reseeding rate by combining the set theoretical plant distance,the time interval between adjacent pulse voltage signals and the forward speed of the seeder.The test bench shows that under the conditions of 26.5-42.2 r/min seeding shaft speed,the system detects the seeding volume with an accuracy of 96.4%,the missed sowing with an accuracy of 95.8%and the resowing with an accuracy of 98.4%.Under the condition that the vibration frequency is 8-16 Hz,the system can detect the sowing volume with an accuracy higher than 95.2%.
作者
孙国峻
张金然
徐勇
余洪峰
何瑞银
SUN Guojun;ZHANG Jinran;XU Yong;YU Hongfeng;HE Ruiyin(College of Engineering,Nanjing Agricultural University,Nanjing,Jiangsu 210031,China;Tianwei Inspection and Testing(Jiangsu)Co.Ltd,Yancheng,Jiangsu 224007,China)
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第5期601-607,共7页
Journal of Hunan Agricultural University(Natural Sciences)
基金
国家重点研发计划项目(2016YFD0300908)
江苏省农业科技自主创新资金项目[CX(19)2012]
江苏省现代农机装备与技术示范推广项目(NJ2019-14)。
关键词
油菜播种机
播种性能监测系统
漏播率
重播率
PVDF双压电薄膜
振动信号消除
比较器抖动消除
rapeseed planter
seeding performance monitoring system
leakage sowing rate
replay rate
PVDF bi-piezoelectric film
vibration signal cancellation
comparator jitter cancellation
