PWM变量控制喷头雾化特性研究
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摘要
为研究基于高频电磁阀的变量喷雾系统对不同喷头的喷雾特性的影响,选取Lu120-02扇形、TR80-02型锥形和AD120-02型防漂3种不同喷头,采用基于高频电磁阀的变量喷雾系统,通过改变脉宽调制(PulseWidth Moderation,PWM)控制信号,测试了不同喷头在不同频率和占空比下的流量和雾滴粒径。结果表明:在高频信号下,3种不同类型的喷头流量和占空比均呈线性变化趋势,且和频率呈正相关性; AD120-02型喷头流量调节倍数在相同测量条件下均大于其余两种类型喷头,在10Hz达到最大调节倍数2.01倍; 3种喷头的雾滴的体积中值中径和控制信号的占空比、频率呈负相关性趋势变化; TR80-02号喷头雾滴分布相对跨度和粒径变化幅度均最小,其雾滴分布展现出最好的稳定性和均匀性。
In order to study the influence of variable spraying system based on high-frequency solenoid valve on the spray characteristics of different nozzles,three different nozzles were selected,including Lu120-02,TR80-02 and AD120-02.The variable spraying system tests the flow and droplet size of different nozzles at different frequencies and duty cycles by changing the pulse width moderation( PWM) control signal. The results show that under the high-frequency signal,the flow of the three different nozzles are all linear with duty cycle and positively correlated with frequency; the flow regulation multiple of the AD120-02 nozzle is larger than the other two under the same measurement conditions,and it reached the maximum adjustment factor of 2.01 times at 10 Hz; the VMD of the three nozzles' droplets and the duty cycle and frequency of the control signal showed a negative correlation trend; the TR80-02 nozzle has the smallest change in RS and particle size,and its droplet distribution exhibits the best stability and uniformity.
In order to study the influence of variable spraying system based on high-frequency solenoid valve on the spray characteristics of different nozzles,three different nozzles were selected,including Lu120-02,TR80-02 and AD120-02.The variable spraying system tests the flow and droplet size of different nozzles at different frequencies and duty cycles by changing the pulse width moderation( PWM) control signal. The results show that under the high-frequency signal,the flow of the three different nozzles are all linear with duty cycle and positively correlated with frequency; the flow regulation multiple of the AD120-02 nozzle is larger than the other two under the same measurement conditions,and it reached the maximum adjustment factor of 2.01 times at 10 Hz; the VMD of the three nozzles' droplets and the duty cycle and frequency of the control signal showed a negative correlation trend; the TR80-02 nozzle has the smallest change in RS and particle size,and its droplet distribution exhibits the best stability and uniformity.
引文
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[25]王双双,何雄奎,宋坚利,等.农用喷头雾化粒径测试方法比较及分布函数拟合[J].农业工程学报,2014(20):34-42.
[2]罗小勇.农药残留及其对策[J].中国农学通报,2009,25(18):344-347.
[3]傅泽田,祁力钧,王俊红.精准施药技术研究进展与对策[J].农业机械学报,2007,38(1):189-192.
[4]段立蹄,刘洋洋,茹煜.植保无人机变量施药监测技术研究发展与展望[J].中国农机化,2018,39(6):108-113.
[5]邓巍,丁为民,何雄奎.PWM间歇式变量喷雾的雾化特性[J].农业机械学报,2009,40(1):74-78.
[6]翟长远,王秀,密雅荣,等.PWM变量喷雾喷头流量模型[J].农业机械学报,2012,43(4):40-44.
[7]随顺涛,朱瑞祥,王丽丽.基于脉宽调制的变量喷药技术控制系统[J].农机化研究,2009,31(4):143-145.
[8]魏新华,于达志,白敬,等.脉宽调制间歇喷雾变量喷施系统的静态雾量分布特性[J].农业工程学报,2013(5):19-24.
[9]史万苹,王熙,王新忠,等.基于PWM控制的变量喷药技术体系及流量控制试验研究[J].农机化研究,2007(10):125-127.
[10]Lebeau F,El B L,Destain M F,et al.Improvement of spray deposit homogeneity using a PWM spray controller to compensate horizontal boom speed variations.[J].Computers&Electronics in Agriculture,2004,43(2):149-161.
[11]Pierce R A,Ayers P D.Evaluation of Deposition and Application Accuracy of A Pulse Width Modulation Variable Rate Field Sprayer[C].California:SAE paper,2001.
[12]韩文霆,姚小敏,朱冰钦,等.变量喷洒喷头组合喷灌试验[J].农业机械学报,2013,44(7):121-126.
[13]韩文霆.变量喷洒可控域精确灌溉喷头及喷灌技术研究[D].杨凌:西北农林科技大学,2003.
[14]张涛涛,张文爱,王秀.基于PWM变量农药喷洒控制系统的研究[J].农机化研究,2012,34(7):57-60.
[15]蒋焕煜,周鸣川,李华融,等.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.
[16]李龙龙,何雄奎,宋坚利,等.基于高频电磁阀的脉宽调制变量喷头喷雾特性[J].农业工程学报,2016,32(1):97-103.
[17]Bennur P J,Taylor R K.Evaluating the response time of a rate controller used with a sensor-based,variable rate application system.[J].Applied Engineering in Agriculture,2010,26(6):1069-1075.
[18]Han S,Hendrickson L L,Ni B,et al.Modification and testing of a commercial sprayer with PWM solenoids for precision spraying[J].Applied Engineering in Agriculture,2001,17(5):591-594.
[19]Gu J,Zhu H,Ding W,et al.Droplet size distributions of adjuvant-amended sprays from an air-assisted five-port PWM nozzle[J].Atomization&Sprays,2011,21(3):263-274.
[20]Schrock M D,Bora G C.Reliability Tests of Pulse Width Modulation(PWM)Valves for Flow Rate Control of Anhydrous Ammonia[J].Applied Engineering in Agriculture,2005,21(6):955-960.
[21]张吉利.农用航空喷雾系统的试验与研究[J].农业技术与装备,2014(5):56-59.
[22]刘永明,金亚英,陈慧岩.采用高速响应开关电磁阀的数字调压试验研究[J].液压与气动,2004(11):41-43.
[23]钟明春.德国LECHLER喷头的分类及性能指标[J].吉林农业,2011(6):184.
[24]吴罗罗,李秉礼,何雄奎,等.雾滴飘移试验与几种喷头抗飘失能力的比较[J].农业机械学报,1996(S1):124-128.
[25]王双双,何雄奎,宋坚利,等.农用喷头雾化粒径测试方法比较及分布函数拟合[J].农业工程学报,2014(20):34-42.