基于键合图理论的间歇式精准喷施系统喷雾压力动态特性  

Dynamic characteristics of the spraying pressure for a precise intermittent spraying system using bond graph theory

作　　者：张校康 温浩军 陈金成[2,3] 张惠 纪超 ZHANG Xiaokang;WEN Haojun;CHEN Jincheng;ZHANG Hui;JI Chao(College of Mechanical and Electrical Engineering,Shihezi University,Shihezi 832000,China;Mechanical Equipment Research Institute,Xinjiang Academy of Agricultural and Reclamation Science,Shihezi 832000,China;Key Laboratory of Northwest Agriculture Equipment,Ministry of Agriculture and Rural Affairs,Shihezi 832000,China)

机构地区：[1]石河子大学机械电气工程学院,新疆石河子832000 [2]新疆农垦科学院机械装备研究所,新疆石河子832000 [3]农业农村部西北农业装备重点实验室,新疆石河子832000

出　　处：《中国农业大学学报》2021年第8期162-172,共11页Journal of China Agricultural University

基　　金：兵团中青年科技创新领军人才计划项目(2018CB010);国家重点研发计划项目(2016YFD0200705);“兵团英才”第二周期第二层次培养计划。

摘　　要：为解决传统喷施系统农药利用率低的问题,设计基于双阀控制的精准间歇式喷施系统。针对喷施系统多能域相互耦合的特点,采用键合图方法建立系统状态方程,并基于20-sim键合图仿真平台进行仿真计算,得到不同压力工况下的喷雾压力动态特性。试验研究喷施系统在0.2、0.3和0.4MPa压力下喷头的喷雾压力动态特性,并采用轮廓分析统计学方法研究仿真结果的准确率。试验结果表明:车速为0.8m/s,作物间距20cm,作物茎叶覆盖直径10cm情况下,间歇式精准喷施系统的喷雾准确率>89%,仿真计算与试验结果最大相合置信水平为0.088。基于键合图理论建立的数值模型能够很好的预测间歇式精准喷施系统的喷雾压力动态特性。In order to overcome low usage of the traditional spraying system,aprecise intermittent spraying system using double valve control was proposed in this study.In view of the coupled multi-energy domains in the spraying system,the spraying dynamics under different pressures was simulated using 20-sim bond graph simulation platform.The spraying system was constructed to test the spraying pressure dynamic characteristics of the nozzle under three different pressures(0.2,0.3 and 0.4 MPa),and profile analysis was applied to evaluate the accuracy of simulation results.The test results showed that the spraying system had an accuracy over 89% when the vehicle speed was 0.8 m/s,the crop spacing was 20 cm and diameter of the crop coverage was 10 cm.The maximum confidence level of the simulation calculation for the test results was 0.088.Therefore,the numerical model based on the bond graph theory can achieve a good performance of predicting the spraying pressure dynamic characteristics.

关 键 词：键合图 状态方程 精准喷雾 数值计算 

分 类 号：S224.3[农业科学—农业机械化工程]