CNG发动机油复合添加剂调和工艺对发动机油性能的影响

对CNG发动机油所采用的添加剂按分组方式和不同的添加顺序进行复合调配,考察调配的不同复合剂对发动机油性能的影响。试验表明：添加剂之间存在协同效应,不同的复合剂对发动机油的性能有一定的影响,其中对100℃黏度变化率、成焦量、磨斑直径和最大无卡咬负荷影响较大,对运动黏度、黏度指数、倾点、低温动力黏度、闪点等影响不大;采用优化后的复合剂添加顺序：T106D+T109B+T203,T154B+T161B+T706,L135+L57,可使CNG发动机油获得最佳综合性能。     

抗磨添加剂在不同ATF基础油中摩擦学性能研究

选择矿物油、部分合成油、全合成油作为自动变速箱油基础油,将不同的极压抗磨剂T203、T307、T306加入不同的基础油组合中,通过四球机测试不同极压抗磨添加剂在基础油中的摩擦学特性。试验结果表明:在单一基础油中,T203、T307对矿物油的抗磨性能最优,不同添加量T306在不同基础油中抗磨性能较相近;在极压性能方面,T203、T306在全合成油中的极压性感受性最优,T307在各基础油中极压性能差别不大;其中部分合成油中,合成油的比例对摩擦性能的影响也有不同程度差异;与单剂相比,双剂配合没有明显提高基础油抗磨性。     

绿色汽油机油抗氧剂复合性能分析研究

分析了常用矿物油抗氧剂的作用机理，从可生物降解润滑油对添加剂的要求出发，选择了T203、T706、CuDTP、DNA等常用抗氧剂，通过试验考察了以菜籽油为原料的汽油机基础油对单一抗氧剂的感受性，采用均匀试验设计分析了抗氧剂之间的复合性能，提出几种抗氧剂的最佳配比为：DNA：T706：CuDTP：T203：4．9：1：1：16。     

甲醇汽油对汽油机油抗磨性影响的试验研究

结合甲醇汽油及其燃烧产物的特点,向汽油机油中添加甲醇汽油及其燃烧产物后,在曲轴箱模拟试验机上进行了氧化试验,在四球磨损试验机上考察了汽油机油氧化前后的抗磨损能力。试验结果表明:甲醇汽油及其燃烧产物使发动机油的抗磨性有一定的降低;添加甲醇汽油的汽油机油氧化后的抗磨性能比氧化前明显下降;同等条件下,甲醇体积分数为35%、50%的甲醇汽油比甲醇体积分数为15%、25%和80%的甲醇汽油对汽油机油的抗磨性影响更大。     

固体添加剂、摩擦改进剂在锂基润滑脂中的应用研究

针对常用复合锂基润滑脂存在的润滑极压抗磨性不足等问题,研究不同固体添加剂、摩擦改进剂对复合锂基润滑脂极压抗磨减摩性能的影响。结果表明,固体添加剂对复合锂基润滑脂极压抗磨性能影响较大,其中PTFE和二硫化钼组成的复配剂可使润滑脂得到优异的极压和抗磨性能;摩擦改进剂Priolube 3986复酯和硬脂酸复配具有协同作用,可明显增强润滑脂的抗磨减摩性能;固体添加剂和摩擦改进剂对润滑脂的润滑作用可以优势互补,全面提升润滑脂综合性能。     

固体添加剂和摩擦改进剂对锂基润滑脂性能的影响

针对常用复合锂基润滑脂存在的润滑极压抗磨性不足等问题,研究不同固体添加剂、摩擦改进剂对复合锂基润滑脂极压抗磨减摩性能的影响。结果表明,固体添加剂对复合锂基润滑脂极压抗磨性能影响较大,其中PTFE和二硫化钼组成的复配剂可使润滑脂得到优异的极压和抗磨性能;摩擦改进剂Priolube 3986复酯和硬脂酸复配具有协同作用,可明显增强润滑脂的抗磨减摩性能;固体添加剂和摩擦改进剂对润滑脂的润滑作用可以优势互补,全面提升润滑脂综合性能。     

硫、磷系添加剂复合使用在菜籽油中的抗磨性能研究

以菜籽油为基础油，在四球摩擦磨损实验机上分别考察丁两组硫系和磷系添加剂T321与T304、T321与T307复合使用对菜籽油的抗磨性和极压性的影响。结果表明，在菜籽油叶：加入添加剂T321与T304能更好地提高菜籽油的抗磨性能和极压性能。     

基于变速变负荷条件的润滑油抗磨性测试方法

目前标准的润滑油抗磨性测试方法都是在固定的转速和负荷下进行的.提出一种新的基于变速变负荷条件下的润滑油抗磨性测试方法,并与SH/T 0189 92方法进行比较.结果表明,2种方法得到的润滑油抗磨性能测试结果具有较好的一致性.基于变速变负荷条件的润滑油抗磨性测试方法可缩短试验时间,提高试验效率,可用于润滑油抗磨性的试验研究.     

复合纳米粒子作为润滑油添加剂的摩擦学性能

研究了复合纳米粒子作为添加剂对润滑油摩擦学性能的影响.将改性纳米CaCO3和纳米Zn按一定质量分数进行复配后,加入到液体石蜡中,采用摩擦磨损试验机考察了其摩擦学性能;并采用正交试验方法分析了2种纳米粒子的最佳配比和最佳添加量.结果表明,复合纳米粒子综合了CaCO3和Zn 2种纳米粒子的性能,作为润滑油添加剂,比单一的纳米CaCO3和纳米Zn添加剂有更好的抗磨减摩性能;在本文试验条件下,纳米CaCO3和纳米Zn的质量比为1∶1,总质量分数为0.6%时,配制的润滑油具有更好的抗磨减摩性能.     

CNG/汽油两用燃料发动机油清净分散性试验研究

按CNG/汽油两用燃料发动机对机油清净分散性能要求,选择了几种清净分散剂,通过试验考察了基础油与添加剂的感受性,采用均匀设计分析了几种添加剂之间的复配性能。试验结果表明:几种添加剂的最佳配比为T104∶T106∶T151∶T152=2∶3∶5∶5。     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

基于多目标非支配解提取法的电力系统无功优化

针对传统的电力系统多目标粒子群优化算法采用权重系数法将多目标转化为单目标,从而忽视了各目标函数间的竞争关系这一问题,提出将非支配解提取法运用到电力系统多目标无功优化中,并设定了一套提取规则,以电力系统中的有功网损、电压偏差和电压稳定裕度为目标,使目标在充分竞争的情况下得出Pareto最优解,利用IEEE-14节点系统对多目标非支配解提取法的电力系统无功优化进行了仿真测试。研究结果表明,该算法一次运行可以得出多组非支配解,既有偏向单个目标的解也有兼顾所有目标的解,克服了权重系数法的盲目性和单一性,可使电力决策者根据实际问题选择最优解,具有较好的灵活性与多样性。     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.