仿生非光滑犁壁规范化设计

通过深入研究典型土壤动物蜣螂的体表而，建立了数学模型，以便描述非光滑单元体尺寸、形状和位置的分布规律；基于数学模型仿真，模拟了仿生非光滑表而。为了满足工业化生产，对仿生非光滑单元体的尺寸进行了规范化处理，并讨论了不同规范化没计的特点，以适应不同的仿生非光滑犁壁加工。     

旋耕机总体参数的CAD系统

在分析、研究旋耕机总体参数与作业质量、功率消耗、结构合理性之间关系的基础上，建立了旋耕机总体设计的ＣＡＤ系统。该系统是在ＡｕｔｏＣＡＤ软件支撑下开发而成，由若干模块组成，可方便得出旋耕机总体设计参数     

Strip-tillage effect on seedbed soil temperature and other soil physical properties

The no-tillage system is perceived as having lower soil temperatures, wetter soil conditions, and greater surface penetration resistance compared with conventional and other conservation tillage systems. Concerns associated with the effect of the no-tillage system on certain soil physical properties (i.e. soil temperature, moisture, and compaction) prompted this study to evaluate the effect of an alternative tillage system, strip-tillage, on these physical properties, compared with chisel plow and no-tillage systems. The study was conducted on two Iowa State University research and demonstration farms in 2001 and 2002. One site was at the Marsden Farm near Ames, where the soils were Nicollet loam (Aquic Hapludolls) and Webster silty clay loam (Typic Haplaquolls). The second site was at the Northeast Research and Demonstration Farm near Nashua, where the soils were Kenyon loam (Typic Hapludolls) and Floyd loam (Aquic Hapludolls).Soil temperature increased in the top 5 cm under strip-tillage (1.2–1.4 °C) over no-tillage and it remained close to the chisel plow soil temperature. This increase in soil temperature contributed to an improvement in plant emergence rate index (ERI) under strip-tillage compared with no-tillage. The results show no significant differences in soil moisture status between the three tillage systems, although the strip-tillage soil profile has slightly greater moisture content than chisel plow. Moisture content through the soil profile particularly at the lower depths under all tillage treatments was greater than the plant available water (PAW). However, the changes in soil moisture storage were much greater with strip-tillage and chisel plow than no-tillage from post-emergence to preharvest at 0–30 and 0–120 cm. It was observed also that most change in soil moisture storage occurred between post-emergence and tasseling. Penetration resistance was similar for both strip-tillage and no-tillage, but commonly greater than chisel plow. In general, the findings show that strip-tillage can contribute effectively to improve plant emergence, similar to chisel plowing and conserve soil moisture effectively compared with no-tillage.     

采用改进的遗传算法求解高速犁体曲面的优化模型

针对高速犁体曲面的最优化问题，提出用一种新的鲁棒全局优化算法——改进的遗传算法，并采用该算法求解犁体曲面。通过6400个数值试验优选出遗传算子，用Turbo C语言编制了相应的软件进行了仿真试验。试验结果表明，该方法能较成功地解决犁体曲面优化设计时高度非线性函数优化求解难的问题，求解时间是复合形法的1/360。     

青海民和官亭盆地喇家遗址古耕作土壤层微形态研究

采用Leica-DMRX偏光显微镜对喇家遗址剖面不同土壤发生层的薄片进行了观察和影像定量分析,旨在阐明青海民和官亭盆地喇家遗址古耕作土壤层和现代耕作土壤层的发育过程和微形态特征。齐家文化时期古耕作土壤层（Ah2/Ap4）的微形态特征主要表现为粗颗粒呈现圆状-次圆状,C/F15μm值呈现低值,排列显示弱定向,常见亚胶膜状和团聚状淀积黏土,大量的针状方解石微晶分布在孔隙边沿,孔隙度较高,主要是以圆形孔洞、囊孔占优势,孔隙壁光滑。辛店文化时期古耕作土壤层（Ah1/Ap3）与Ah2/Ap4层的主要微形态特征相似,只是C/F15μm值呈现相对高值,亚胶膜状和团聚状淀积黏土比例减少。相比于古耕作土壤层（Ah1/Ap3,Ah2/Ap4）,现代耕作土壤层（Ap1）主要表现为粗颗粒呈现次棱角状-次圆状,含有大量浓聚物状残积黏土和极少量亚胶膜状淀积黏土,含有大量的针状方解石微晶,孔隙度较低,且C/F15μm值趋于升高。古耕作土壤层 Ah2/Ap4和 Ah1/Ap3皆为黑垆土,它们分别是在全新世中期大暖期的环境背景之下,齐家文化时期和辛店文化时期人类简单耕作和古生物气候条件下的产物。Ap1层为淡灰钙土,它是距今约1 500年以来人类施加土粪、农业耕作和沙尘暴堆积的综合产物,其特征主要受到人类活动强度和方式的控制。     

小型背负式花生联合收获机的设计研究

介绍了国内外花生联合收获机的研制现状，阐述了小型背负式花生联合收获机的特点、结构设计、参数确定、试验情况以及应用前景。     

水平换向犁油缸底座的机构设计与有限元分析

运用机械虚拟设计方法，以SolidWorks2001为技术平台，建立了水平换向犁的三维模型，在对其运动、受力情况进行理论分析的基础上，运用挂接于SolidWorks2001之上的DDM对其进行动态仿真，找出该犁油缸底座中的油缸连接板受力最大的时刻；然后在此时刻对其进行动态加载，再运用内嵌于SolidWorks2001之上的COSMOS＼works对其进行有限元分析，根据其力学及运动学分析结果。找出设计中的薄弱环节，并提出相应的改进措施。     

手扶驱动式圆盘犁试验结果分析

对手扶拖拉机配套驱动式圆盘犁研究过程中有关试验结果作一分析。研究结果表明，作业工艺质量符合农艺要求；驱动速度系数以２．２０～４．６７为宜；以主选工作挡乘坐作业可显著提高生产率；驱动滑切形成沟壁，撕裂形成沟底，较大地降低了能耗。研究结果可供手扶驱动式圆盘犁产品设计及推广使用部门决策时参考。     

悬挂式旋耕机组振动问题研究

悬挂式旋耕机组在作业过程中存在着严重的振动问题,这不仅恶化了驾驶员的工作环境,而且直接影响机具的工作寿命。本文运用频谱分析方法和模态分析技术,系统研究了引起振动的因素,提出了改善振动特性的方法。     

曲元线设计犁体曲面之探讨

本文提出用曲线作为水平元线形成扭柱型犁体曲面的数学模型,从而可用电子计算机探求最优的犁体曲面。由于采用等轴双曲线作水平元线,包络抛物线作导曲线,因此,通过控制导曲线的形状、位置以及曲元线的轴距A、曲线所在标准坐标系相对犁体曲面坐标系的旋转角φ、标准坐标系的原点坐标即可求得所需的犁体曲面。