摘要
提出了一种基于压电传感器的种子数粒系统,该系统用悬臂梁结构感受种子冲击以及用压电元件将冲击转换为电信号,经过放大整形后变成脉冲信号输入单片机计数并显示。根据典型的弹簧-质量-阻尼系统的二阶传递函数理论,对系统阻尼振动频率和阻尼比进行了分析。选用合适的高分子材料和安装方式,使系统拥有较好的阻尼比,种子短暂的冲击作用变换为单个波峰电压信号以实现准确计数。实验室试验结果表明,数粒系统单粒测量误差小于0.4%。
A seed-counting system was put forward with a cantilever beam detecting the impact of falling seeds,a piezoelectric sensor converting the impact into electrical signals,and a micro-controller counting and displaying seed counts.Based on the classical second-order transfer function model of the spring-mass-dashpot system,the natural frequency and damping ratio were analyzed.By using appropriate polymer material and signal conditioning,a testing system with proper damping ratio was constructed.The impact of a single seed became a single fast decaying pulse signal so that easy counting could be implemented.The experimental system showed the measurement error was less than 0.4% in single seed counting tests.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2011年第8期41-45,共5页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家高技术研究发展计划(863计划)资助项目(2006AA10A304
2006AA10Z255)
关键词
种子
压电传感器
悬臂梁
振动
数粒
Seed
Piezoelectric sensor
Cantilever beam
Vibration
Seed counting
