Review of research on international gear transmissions

Several international conferences on gears is introduced, furthermore, the statistic analysis is conducted on the international gear research in recent years by taking example of the most influential Germany international gear conference. Some important issues on the design, manufacture, and application of gear transmissions is discussed including how to improve the load capacity, suppress vibration and noise, improve transmission efficiency, save resources, improve the efficiency of manufacture, and avoid the environmental contamination, and so on. Main progresses and research highlights of the international gear researches are also introduced and analyzed.     

金属带-行星齿轮无级变速系统调速特性的研究

车用金属带－行星齿轮无级变速传动系统,具有结构简单、速比变化范围宽（可超过２５￣３０）的优点,是目前国际上广泛进行研究的一种较理想的新型传动装置。本文详细阐述了其传动机理功率流程,并通过速比调控规律的分析,揭示了系统于同步转换点处发生的内在原因,为对该传动系统实施自动控制奠定基础。     

Gear-bearing coupling dynamics characteristics of wind turbine planetary gear transmission system under variable load

Considering that the transmission system of wind turbine works in complex and changing load environment caused by stochastic wind speed,this paper uses sparse least squares support vector machine(SL-SVM) to simulate wind speed of true wind field,and obtains time-varying wind load caused by stochastic wind speed. The lumped-parameter method is used to develop a dynamic model of planetary gear transmission system of wind turbine coupled with bearing. The model includes the varying wind load,time-vary mesh stiffness of gear pair and time-vary stiffness of rolling element bearing. The numerical method is used to simulate the dynamic performance of planetary gear system of Multibrid Technology Wind Turbine with 1.5 MW rated power. The vibration displacement responses of the transmission system are obtained as well as dynamic meshing force each pair of gear and nonlinear bearing forces. The research can provide a foundation for optimizing dynamic performance and reliable design of gear transmission system of wind generator.     

减小三环减速器振动的试验研究

对三环减速器传动机理进行了研究,根据动力分析计算结果提出了减小三环减速器振动的措施,并进行了试验研究。     

小麦面粉及鲜面片色泽的影响因素

为明确小麦面粉及鲜面片色泽的影响因素,选取10个江苏沿淮及淮南地区大面积推广小麦品种进行2年3点种植,比较不同品种、不同地点和不同年份面粉及鲜面片色泽差异并分析其影响因素,探讨面粉及鲜面片色泽与品质性状间的相关性。结果表明,扬麦11、扬辐麦4号和宁麦14的面粉及鲜面片色泽较好,亮度高、黄度低。基因型是决定面粉白度、亮度(L~*值)和黄度(b~*值)的主要因素;环境因素亦影响面粉及鲜面片色泽。扬麦16、宁麦14和郑麦9023在不同年度及不同地点的色泽表现稳定。面粉与鲜面片放置24h内的色泽间呈显著正相关;面粉白度与籽粒硬度和出粉率呈极显著负相关;面粉及鲜面片L~*值与蛋白质含量、湿面筋含量、揉混仪参数和粉质仪参数呈显著或极显著负相关,与糊化特性参数呈显著或极显著正相关。综上所述,面粉色泽主要由基因型决定,鲜面片色泽与面粉色泽显著相关,二者与籽粒品质具有显著相关性。在小麦育种中,可通过面粉色泽指标筛选高白度及品质的品种。     

汽车自动变速器的单片机控制系统

本文分析了现有的自动变速器控制系统.指出单片机应用于自动变速器的控制具有明显优势.通过一个二参数控制系统实例,介绍一般自动变速器单片机控制的设计过程和注意事项.     

超高分子量聚乙烯工程塑料的摩擦磨损性能研究

用摩擦磨损试验和腐蚀磨损试验研究了超高分子量聚乙烯塑料的分子量、磨损时间、滑动速度、载荷、填料等对其摩擦磨损性能的影响，并对超高分子量聚乙烯工程塑料的摩擦磨损特性系统分析，为其优化设计提供理论依据。     

并联式混合动力车辆动力转换控制策略研究

从提高燃油经济性的角度出发，确立了并联式混合动力车辆传动系统的设计方案，建立了以直流电动机和发动机为动力源，金属带无级自动变速器为调速装置，行星排为动力转换器的并联式混合动力车辆动力学仿真模型。并分别以发动机最佳燃油经济性和电动机最佳效率为控制目标，分析了混合动力车辆由电动机驱动向发动机驱动转换时的综合控制策略。从而为并联式混合动力车辆的开发设计提供了理论依据。     

金属带无级自动变速车辆调速特性研究

采用键合图理论，建立了金属带无级自动变速系统在起步和加速过程中的动力学仿真模型，分析了发动机不同油门开度和对汽车实施最佳燃油经济性控制条件下，金属带无级变速装置速比随时间的变化规律，从而为无级自动变速汽车的选型匹配和方案布置提供理论设计依据。     

Study of Tooth Contact and Kinematic Precision on Cone-Generated Double Enveloping Worm Gearing

The tooth contact and kinematic precision of cone-generated double-enveloping worm gearing with machining and assembling errors have been investigated. The influence of different errors on driving quality has been discussed. The assembling method to reduce or eliminate the influences of machining errors on tooth contact and kinematic precision has been proposed.