蒋焕煜,周鸣川,李华融,蒋卓华.PWM变量喷雾系统动态雾滴分布均匀性实验[J].农业机械学报,2015,46(3):73-77.
Jiang Huanyu,Zhou Mingchuan,Li Huarong,Jiang Zhuohua.Experiment on Dynamic Droplet Distribution Uniformity for PWM Variable Spray System[J].Transactions of the Chinese Society for Agricultural Machinery,2015,46(3):73-77.
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PWM变量喷雾系统动态雾滴分布均匀性实验   [下载全文]
Experiment on Dynamic Droplet Distribution Uniformity for PWM Variable Spray System   [Download Pdf][in English]
投稿时间:2014-05-29  
DOI:10.6041/j.issn.1000-1298.2015.03.010
中文关键词:  变量喷雾 脉宽调制 水敏试纸 变异系数
基金项目:国家高技术研究发展计划(863计划)资助项目(2012AA10A504)、农业部引进国际先进农业科学技术资助项目(2011-G32)和浙江省“新世纪151人才工程”资助项目
作者单位
蒋焕煜 浙江大学 
周鸣川 浙江大学 
李华融 浙江大学 
蒋卓华 浙江大学 
中文摘要:由于PWM变量喷雾作业过程中喷头不连续作业,喷雾的均匀性特别是喷雾机运动方向上的均匀性较难控制,为此通过高速电磁阀、不锈钢压力罐、压力传感器、气泵、调速输送带等构建了一套动态PWM变量喷雾实验平台,并对该平台动态喷雾雾滴分布特性进行实验研究。采用水敏试纸作为获取动态雾滴分布状态手段,通过图像处理技术以区域内雾滴覆盖率的变异系数作为动态雾滴分布均匀性判定指标,评估了在不同PWM控制信号频率、不同PWM控制信号占空比及不同喷雾压力下的单个喷头动态雾滴分布均匀程度。经实验表明,变异系数随控制信号占空比的增大而减小,控制信号频率对动态喷雾雾滴分布均匀性有较大影响,变异系数随控制信号频率增大而减小,喷雾压力对变异系数影响较小,喷雾压力越大变异系数越大。
Jiang Huanyu  Zhou Mingchuan  Li Huarong  Jiang Zhuohua
Zhejiang University,Zhejiang University,Zhejiang University and Zhejiang University
Key Words:Variable spray Pulse width modulation Water sensitive paper Coefficient of variation
Abstract:A dynamic PWM variable spray experiment platform was built up to solve the problems of discontinuous operation of nozzles in spray progress, and improve the homogeneity of droplets, especially homogeneity along the travel direction. This platform included high-speed solenoid valve, a stainless steel pressure tank, a pressure sensor, an air pump, a conveyor and so on. The distribution features of droplets in dynamic spray based on this platform was studied. Water sensitive paper was used to collect droplets under different frequencies and different duty cycles of PWM controlling signals, also different pressures of spray. Image processing technology was used to get the coefficient of variation (CV) value of percent area droplets coverage to evaluate the uniformity of droplets. The homogeneity of single nozzle dynamic spraying was evaluated under different experiment conditions. The research suggested that CV value decreased as the duty cycle of controlling signals increased, the frequency of controlling signals had influence on homogeneity, which was CV value decreased as the frequency increased. And what is more, when pressure became high, CV value became larger and the influence was weaker compared to the other factors.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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