双板差分冲量式谷物流量传感器设计  

Design of a Dual-plate Differential Impact-based Yield Sensor

作　　者：胡均万[1] 罗锡文[1] 阮欢[1] 陈树人[2] 李耀明[2] 

机构地区：[1]华南农业大学南方农业机械与装备关键技术省部共建教育部重点实验室,广州510642 [2]江苏大学现代农业装备与技术省部共建教育部重点实验室,镇江212013

出　　处：《农业机械学报》2009年第4期69-72,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家“863”高技术研究发展计划资助项目(2006AA10A307);国家“十一五”科技支撑计划资助项目(2006BAD11A03)

摘　　要：设计了一种双板冲量式谷物流量传感器及其差分消振电路,以消除车身振动对测产精度的影响。振动试验表明,在没有谷物输入时联合收获机车身振动导致前后2个检测板产生的2个振动信号是一对共模信号,可通过电路差分的方法消除;差分后传感器的输出电压的信噪比由2.5 dB提高到62 dB。在零喂入量情况下,振动产生的零点误差小于0.01 g/s;在联合收获机正常作业的喂入量范围内（0.5-2 kg/s）,实验室测量误差小于3%。田间实际测量误差不大于5%。A dual-plate differential impact-based yield sensor was designed to eliminate the influences of the vibration signal. Two similar parallel plates were mounted in front of the outlet of the combine harvester. The front plate was used to detect the impact of grain out of elevator the harvester as well the vibration. The rear plate was used to detect the vibration only. A differential circuit was used to eliminate the vibration signal of the harvester. The experimental waves showed that the vibration signals of the two plates were similar while the harvester runs with no grain input. The influence of the vibration could be eliminated by the differential circuit. The zero drift of this sensor is less than 0.01 g/s. The error of the yield sensor is less then 3% at flow rates 0.5--2 kg/s in lab. It is not greater than 5 % in field condition.

关 键 词：谷物 流量传感器 冲量式 振动信号 双板 差分电路 

分 类 号：S816.34[农业科学—饲料科学] TP212[农业科学—畜牧学]