基于神经网络泛函数的摩擦学系统转化模型研究

建立了摩擦学特性影响规律的径向基神经网络模型，可以较准确地计算和预测不同摩擦学系统条件下摩擦系数与各影响参数之间的关系；进一步基于神经网络建立了不同系统之间的泛函数关系，基本解决了摩擦学系统的条件转化，为摩擦学设计、程序化计算和分析提供了一种方便有效的工具。     

主动摩擦学设计方法

摩擦学是研究具有相对运动表面之间的相互关系的学问，摩擦学设计是以摩擦学的基本观点进行设备运行系统工作状态研究的设计，本文综合当前国内外摩擦学设计的理论和方法，提出主动摩擦学设计的基本概念和设计方法。     

摩擦学设计主要是摩擦学系统的设计

在一般意义下的讨论了摩擦学设计,涉及 摩擦学设计的目标和特征。强调摩擦学设计不能仅仅被理解为理解为摩擦副的设计,更能被理解为摩擦,磨损或润滑的设计。介绍了国内在转子－轴承－密－齿轮系统、推力轴承系统、缸套－活塞－活塞环系统、主动磁轴承系统和摩擦学机敏材料系统设计方面所做的一些工作。国家自然科学基金委员会对这些 强有力的经费支持。     

摩擦制动系统摩擦表面的摩擦学研究

基于系统分析的方法，建立了摩擦制动系统的摩擦学模型，分析了系统结构随时间和外界条件变化的特牲。对摩擦表面的摩擦学行为作了系统的分析，揭示了制动过程中摩擦力在不同条件下的组成机制。     

凸轮传动系统的摩擦学设计

凸轮传动系统主要被应用于机械控制系统，控制精度是其机构设计的重点内容，凸轮廓线精确设计是运动方式的基本保证，摩擦学问题是系统正常工作的重要条件，是系统失效的重要因素，决定系统的使用寿命。本文综述和分析凸轮传动系统摩擦学设计的基本问题，提出设计研究的方向。     

基于面向对象技术的摩擦学设计语言

对摩擦学任务求解过程进行了系统分析．提出了摩擦学设计构件模型，定义了基于该模型的“摩擦学设计语言（TDL）”。该语言主要解决了各类摩擦学任务描述与非同类摩擦学数据与应用共享两个问题。应用表明，该语言可以很好地描述各类摩擦学任务，并为各类摩擦学应用提供了统一的数据接口。     

在线摩擦学设计知识获取方法的研究

采用故障诊断和动力学分析相结合的方法，研究了轴承—转子系统摩擦学设计知识获取方法，提出了动力学性能神经网络计算方法，实现了在线动力学分析，为知识获取提供轴承—转子系统实时性能参数。利用灵敏度矩阵可以得到系统运行、维护和设计的改进方案。实例证明：该方法是可行有效的。     

摩擦学尺寸效应及相关问题的思考

根据文献研究,简单阐述了尺寸效应的研究现状、宏观/微观摩擦学的差异。从尺寸大小的角度,提出了应当对摩擦学传统理论有效性、过渡状态摩擦学、摩擦系数、摩擦学与材料、系统结构和物理规律尺寸效应与摩擦学特性的关系等一些摩擦学领域的重要基础问题进行认真思考和系统研究。     

大型旋转机械摩擦学—动力学设计数据库的设计与实现

本文针对摩擦学系统的特点，详细地研究了一类有代表性的摩擦学系统－大型汽轮发电机组转子轴承系统－的摩擦学－动力学设计数据库。说明了摩擦学－动力学设计数据库的设计过程，以及摩擦学－动力学设计数据库的结构和功能。     

重载丝杠螺母副的摩擦学系统模型的建立

在基本摩擦学理论和实验的基础上 ,分析了某种选定的摩擦副在某种选定的摩擦学工况条件下的摩擦学系统特性 ,建立了轧机压下装置中重载丝螺母副的摩擦学特性与载荷之间关系的数学模型 ,推导出相对准确的摩擦系数—载荷 ,磨损率—载荷计算公式 ,与实验结果比较有较好的吻合性。该数学模型可为摩擦学系统特性转化的研究提供研究参照体 ,亦可为工程设计人员在摩擦学设计时提供有效的计算工具。     

Computational methods applied to oxidational wear

Theories of oxidational wear tend to involve the number of contacts (N) between sliding tribo-elements as well as the contact temperature (T_F), i.e. the temperature at the real areas of contact between these tribo-elements. This paper describes how these important parameters can be found for a given tribo-system, namely high-chromium ferritic steel pins sliding against rotating austenitic stainless steel disks, by the application of a numerical method to the analysis of the theoretical and experimental divisions of heat (DTH and DE) between tribo-elements undergoing oxidational wear. The paper then shows how one can use these values of N and T_F as inputs to a similar numerical method in order to deduce credible and consistent values for the tribological oxidation constants required for the theoretical oxidational wear rates (W_RTH) to be equal to the experimentally measured oxidational wear rates (W_REXPT) of the given tribo-system.     

Calculating frictional force with considering material microstructure and potential on contact surfaces

A method based on the energy dissipation mechanism of an Independent Oscillator model is used to calculate the frictional force and the friction coefficient of interfacial friction. The friction work is calculated with considering the potential change of contact surfaces during sliding. The potential change can be gained by a universal adhesive energy function. The relationships between frictional force and parameters of a tribo-system, such as surface energy and microstructure of interfacial material, are set up. The calculation results of the known experimental data denote that the frictional force is nearly proportional to the surface energy of the material, nearly inversely proportional to the scaling length, and independent of the lattice constant. The results agree with that of adhesion friction equations. They also agree with the experimental results performed with an atomic-force microscope under the ultra high vacuum condition. __________ Translated from Tribology, 2006, 26(2): 159–162 [译自: 摩擦学学报]     

Synthetical efficiency-based optimization for the power distribution of power-split hybrid electric vehicles

Now the optimization strategies for power distribution are researched widely, and most of them are aiming to the optimal fuel economy and the driving cycle must be preknown. Thus if the actual driving condition deviates from the scheduled driving cycle, the effect of optimal results will be declined greatly. Therefore, the instantaneous optimization strategy carried out on-line is studied in this paper. The power split path and the transmission efficiency are analyzed based on a special power-split scheme and the efficiency models of the power transmitting components are established. The synthetical efficiency optimization model is established for enhancing the transmission efficiency and the fuel economy. The identification of the synthetical efficiency as the optimization objective and the constrain group are discussed emphatically. The optimization is calculated by the adaptive simulated annealing （ASA） algorithm and realized on-line by the radial basis function （RBF）-based similar models. The optimization for power distribution of the hybrid vehicle in an actual driving condition is carried out and the road test results are presented. The test results indicate that the synthetical efficiency optimization method can enhance the transmission efficiency and the fuel economy of the power-split hybrid electric vehicle （HEV） observably. Compared to the rules-based strategy the optimization strategy is optimal and achieves the approximate global optimization solution for the power distribution. The synthetical efficiency optimization solved by ASA algorithm can give attentions to both optimization quality and calculation efficiency, thus it has good application foreground for the power distribution of power-split HEV.     

铣削加工过程的智能多目标优化方法

采用神经网络和专家系统的方法,实现带宽容分层约束的铣削加工过程多目标优化,利用Ｂｏｌｔｚ－ｍａｎｎ机神经网络求妥各层次的多目标优化问题,利用专家系统控制进程。通过实例证明了系统优化求解的有效性。     

线切割系统中用圆弧代替非圆曲线的优化模型

建立了在线切割系统中用尽可能少的圆弧近似代替非圆曲线的优化模型，采用二分法进行求解。用该算法组成的线切割编控软件与国内线切割同类软件相比在加工条件相同的情况下，获得了用圆弧代替非圆曲线其3B程序最少、加工时间最短的良好效果。     

Effects of laser surface texturing on friction behavior of silicon nitride under lubrication with water

Water lubrication is one of the candidates of the tribo-system with low negative environmental impact. It is well known that some kinds of ceramics show excellent tribological properties under lubrication with water. The characteristic improvement was attempted by giving texturing to Si₃N₄ so that the water lubrication might spread as a representative of the ecotribology system. The surface laser texturing showed the friction reducing effect under the sliding condition of the low bearing characteristic number. The mechanism of the triblogical property improvement by the laser surface texturing was discussed based on the experiment results and the surface analytical results.     

自动扶梯智能安防系统的设计

为了预防自动扶梯发生安全事故,设计了一种基于人工智能的自动扶梯智能安防系统。这一系统利用视频数据采集平台采集乘客数据,应用机器视觉及人工智能技术对乘客的姿态与行为进行主动识别,针对乘客的危险行为给出异常报警,在出现危险状态时触发声光报警器,控制自动扶梯减速或停止运行。这一系统通过有线或无线网络将数据传输至云平台,监管部门可基于手机客户端进行实时监控。特种设备监督管理部门、检验机构、维护保养单位、产权单位等可通过这一系统掌握自动扶梯运行状况。应用所设计的自动扶梯智能安防系统,可以显著提高自动扶梯安全事故预防水平和应急处理能力。     

公交车钢板吊耳座的拓扑优化设计

针对公交车钢板吊耳座的轻量化设计问题,基于HyperWorks进行了拓扑优化设计。以钢板吊耳座零件的单元密度为变量,以最大应力为约束条件,以体积分数最小为目标函数,建立了拓扑优化模型。利用HyperMesh进行了网格划分,通过OptiStruct模块获得了优化计算结果。结合企业加工工艺要求,修改优化计算结果,实现了钢板吊耳座的轻量化设计。拓扑优化设计后总质量比原设计方案减轻了25.71%。安全计算的结果验证了拓扑优化设计结果的可行性。     

甘蔗收获机械台架数字样机的结构优化设计研究

对甘蔗收割机台架机构虚拟样机的运动仿真能使数字样机尽量模拟实际状态,观察模型是否正确表达设计要求;对样机台架结构进行了有限元分析并采用一阶方法进行优化,可以预估凭经验设计结构的最危险点,对结构进行改造和优化,保证结构综合应力在材料许用应力范围内使整体重量下降约7%,材料分配更合理,大大缩短了研制周期,降低了设计成本.对虚拟样机进行仿真和优化,可为数字样机的创新设计提供一种新的思路和应用依据.     

Performance optimization of hypervelocity launcher system using experimental data

This study presents the performance optimization of hypervelocity launcher system by using the experimentall data. During the optimization, the RSM (Response Surface Method) is adopted to find the operating parameters that could maximize the projectile speed. To construct a reliable response surface model, 3 full factorial method is used with the selected design variables, such as piston mass and 2 driver fill pressure. Nine test data could successfully construct the reasonable response surface, which used to yield the optimal operational conditions of the system using the genetic algorithm. The optimization results are confirmed by the experimental test with a good accuracy. Thus, the optimization can improve the performance of the facility.