波纹曲面指夹式玉米精量排种器设计及其机理研究

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1、中图分类号学校代码１０２２４密级公开学号１６０７０９５去＃寒嗛人缭博士学位论文波纹曲面指夹式玉米精量排种器设计及其机理研究作者唐汉导师王金武教授学位类别工学博士所在学院工程学院一级学科农业工程二级学科农业机械化工程二〇一八年十二月ClassifiedIndex：Code：10224Confidential(yes/no)：noNo.1607095DissertationfortheDoctoralDegreeDesignandMechanismAnalysisofRippleSurfacePickupFi

2、ngerMaizePrecisionSeedMeteringDeviceCandidate:TangHanSupervisor:Prof.WangJinwuDegreeCategory:DoctorofEngineeringCollege:EngineeringCollegeFirstleveldiscipline:AgriculturalEngineeringSecondleveldiscipline:AgriculturalMechanizationHarbinChinaDecember2018目录摘要...................

3、............................................................................................................................I英文摘要.....................................................................................................................................III1引言.......

4、....................................................................................................................................11.1研究目的与意义.................................................................................................................11.2玉米种植及精密播种技术....

5、..............................................................................................21.2.1玉米种植分布及产量..................................................................................................21.2.2玉米精密播种技术......................................................

6、................................................41.3国内外玉米精量排种器研究现状......................................................................................41.3.1精量排种器类型及工作原理.......................................................................................41.3.2国外玉米精量排种器研究现

7、状...................................................................................71.3.3国内玉米精量排种器研究现状.................................................................................101.4研究内容与方法...............................................................................

8、................................171.4.1课题来源................................