棉秆切碎器的浮动夹持喂入机构设计

针对棉秆切碎收获机械介绍了一种新型带自调节、夹紧和主动输入功能的喂入机构。同时,对其结构组成、工作原理和关键部件参数设计分别进行了详述,并验算了最大通过量,分析了几种改变切碎长度的方法。实践表明,该机构还可适用于其它硬质冠状秸秆切碎前的强制喂入,具有结构简单、稳定性好、使用维修方便以及使用寿命长等特点。     

农用车辆机械性能综合检测系统的开发

基于农用车辆机械性能分析,设计了农用车辆综合性能检测方案,介绍了系统检测系统工作原理,建立了道路工况模型,并对发动机特性、变速器性能及制动性能进行试验分析。同时,开发了基于LabVIEW的综合系统,并与MABLAB软件混合设计,不仅拓展了开发平台功能,而且能满足多种工控性能参数的检测需求。     

半履带式气垫车的模糊控制系统

根据半覆带式气垫车的结构型式及行走特性,提出了模糊ＰＩＤ控制方案,研制了实时测量系统,并设计了相应的测量电路,由计算机协调控制整个闭环系统,保证气垫车能够稳定地运行并达到功率损耗最小。整个控制过程用ＭＡＴＬＡＢ软件进行了仿真并进行了试验研究工作。试验结果证明采用自速写模糊ＰＩＤ控制器能够使半覆带式气垫车稳定行驶的最佳工作状态。     

协方差分析方法优化农用车悬架参数

介绍了协方差分析随机振动的基本原理,建立了５自由度的农用车平面模型和状态方程,给出了评价农用车行驶平顺性的目标函数,通过协方差方法得出目标函数随悬架的阻尼和刚度变化的关系,用实例验证利用这种方法优化农用车悬架参数是可行的。     

农用运输车用张紧轮式永磁恒压发电机

张紧轮式永磁恒压发电机的研制提高了农用运输车的使用可靠性、方便性,降低了成本。由于对发电机重新设计和采用新的电子技术,使该发电机输出电压稳定在一定范围内,解决了农用运输车低速照明的电源问题。     

农用运输车车架强度及货厢对其贡献问题研究

通过对农用运输车车架强度计算和试验,就货厢对车架强度贡献问题进行了分析,为车架的节材研究奠定了基础。     

Performance assessment of small irrigation schemes along the Mauritanian banks of the Senegal River

Irrigation plays a fundamental role in world food provision but, to date, it has performed below expectations in Sub-Saharan Africa. The present study assesses and diagnoses the performance of 22 small and medium size community-managed irrigation schemes, mainly devoted to rice production, in different locations along the Mauritanian banks of the Lower Senegal River. The evaluations followed the Rapid Appraisal Process in which semi-structured interviews were held with representatives of the Cooperatives’ Boards in charge of each scheme to obtain information about the organisation of the cooperative, land tenure, irrigation system and organization, cropping pattern and soils. Additionally, for each irrigation scheme, the water-delivery service was characterized by making qualitative and comparative observations during field inspections; the pumping station's performance was diagnosed by a local specialist; the discharge at the head of the system was measured; daily irrigation time was recorded; and crop yields were determined by plot sampling. Then a set of performance indicators was computed. Water delivery capacity referred to irrigated areas was insufficient in a third of the schemes, and this insufficiency was exacerbated by poor maintenance. Irrigation intensity in habilitated areas was rather low being less than 0.66 in 50% of the schemes. The average productivity of land, irrigation water, and fuel (3.38 t ha⁻¹, 0.30 kg m⁻³ and 2.37 kg kWh⁻¹, respectively) were well below potential.     

电动汽车检测与维修技术人才培养的探讨

汽车工业的发展带来能源危机和环境污染两大问题,电动汽车产业正在呈现出蓬勃的生机,而电动汽车检修行业从业人员明显存在数量严重不足和素质普遍不高的现象。作为培养高技能人才的高等职业院校应顺应企业和市场的需求,加快电动汽车检测与维修技术人才的培养。     

复杂路面农用车辆制动防抱死系统仿真研究

分析了农用车辆使用制动防抱死系统的可行性,研究了复杂路面农用车辆制动防抱死系统仿真模型和仿真试验控制问题,建立了1/3农用三轮车制动动力学模型、复杂路面附着条件模型、农用三轮车仿真模型和复杂路面仿真模型,提出了两种制动工况下的仿真试验方法,准确模拟出农用车辆在复杂路面制动时车速与轮速曲线变化情况,验证了复杂路面ABS控制的有效性。     

先进安全车(ASV)技术的现状与发展

先进安全车(ASV,AdvancedSafetyVehicle)是为21世纪开发使用的一种高度智能化的安全车,其主要利用电子技术进一步提高汽车的安全性能。因而,汽车安全性的研究与开发已成为汽车行业发展的主要方向。为此,介绍了先进安全车(ASV)技术的现状,并讨论了这项技术的发展趋势。