Study on Grain Loss Detecting Sensor of Combine Harvester
A floating raft structure sensor using piezo-electric polyvinylidene fluoride (PVDF) film as sensitive . material for grain loss detecting of combine harvester was presented in this paper. Double-layer vibration iso-lator was proposed to eliminate the vibration influence of combine harvester. Signal processing circuit which composed of a charge amplifier, band-pass filter, enve-lope detector, absolute value amplifier and square wave generator was constructed to detect the grain impact signal. According to the impact duration of grain on PVDF film, critical frequencies of band-pass filter were determined and the impact responses of filter under dif-ferent impact durations were numerical simulated. Then, grain detecting experiments were carried out by assem-bling the sensor on the rear of vibrating cleaning sieve, the results showed that the grain impact can be identi-fied effectively from vibrating noise and the sensor can output a standard square voltage signal while a grain impact is detected.
combine harvester grain loss PVDF film de-tecting sensor
Zhao Zhan Zhou Jing
High-tech Key Laboratory of Agricultural Equipment & Intelligentization ofJiangsu Province Zhenjiang Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education & Jiangsu Prov
国际会议
山东淄博
英文
109-112
2011-05-27（万方平台首次上网日期，不代表论文的发表时间）