一种新型船用柴油机油的研制

根据船用柴油机油的性能要求,通过开展基础油及各功能添加剂等对油品抗水、分水性能的影响研究,以及清净分散剂、抗氧抗磨剂等添加剂对油品高温清净性、烟炱分散性、抗磨损性及抗氧抗腐蚀性的影响研究,提出一种新型船用柴油机油配方方案。综合评定试验结果表明,研制的船用柴油机油具有优异的理化性能和良好的分散性、抗氧抗腐蚀性、抗磨性能和清净性能,并通过了FZG齿轮试验机试验和发动机台架试验。     

甲醇汽油发动机润滑油抗磨性试验研究

根据甲醇汽油对发动机润滑油抗磨性影响的要求,选用T203、T706、MoDDP抗磨添加剂,开发出一种甲醇汽油发动机润滑油;通过四球机试验考察各单剂对基础油抗磨性的影响,并采用正交试验方法分析各剂之间的复合性能。试验结果表明:当添加剂T203、MoDDP、T706的配比为1.5∶1.5∶0.4时,研制油的复合抗磨性能最佳。     

机械用中高档新油品技术简介（七）

6.油品添加剂(1)润滑油清净添加剂相当于Exxon公司Paranox-26油品,有效成分为石油磺酸钙(?)碳酸钙的胶体化合物。产品性能良好,主要用于内燃机润滑油中作为清净性添加剂,使发动机内部清净、减少积碳、减少磨损、延长机器使用寿命,是现代各类内燃机油不可缺少的添加剂的。与老产品上—202性能相比,添加量可节约20%左右,效果显著。(2)T405硫化烯烃棉子油油性添加剂相当于Lubrizol 5006硫化鲸鱼油代用品,可以     

二冲程汽油机油清净性行车试验研究

本文介绍了几种二冲程摩托车专用润滑油在轻骑AG50型轻便摩托车上的野外行车清净性试验研究。研究结果认为,合理地平衡油品清净性与润滑性的添加剂配方技术是提高二冲程发动机油质量的关键。     

生物降解二冲程油中添加剂对清净性影响的研究

研究了添加剂对以合成酯为基础油的生物降解二冲程汽油机油（简称二冲程油）清净性的影响.经发动机台架试验，得出如下的结论：金属有灰清净剂有恶化生物降解二冲程油高温清净性的迹象；无灰清净分散剂能够有效地改善生物降解二冲程油高温清净性，但有一个最佳的性能/用量比例；高分子酰胺类与聚酰胺类添加剂复合使用有利于降低成本，提高油品的适应性；中碱、高碱抗粘环添加剂对活塞环粘结和整体清净性都有较大的改善作用，复合使用同样可以提高油品对使用条件的适应性；抗磨添加剂、抗氧剂和降凝剂对生物降解二冲程油的清净性影响不大。     

四冲程摩托车发动机油行车试验研究

本文介绍了几种商品四冲摩托车专用润滑油在嘉陵ＪＨ１２５Ｄ型摩托车上的行车试验研究。试验结果表明,运用合理的添加剂配方技术,提高润滑油的抗氧化能力是改善四冲程发动机油清净性和抗磨性的关键。     

润滑油添加剂摩擦学性能的试验研究

在四球摩擦磨损试验机上对比评价了T202,T321和T406的摩擦学性能,应用扫描电镜(SEM)和X-射线能谱仪(XPS)分析了GCr15钢球表面磨痕及化学反应膜成分,对不同添加剂对轴承钢球接触疲劳寿命可能的影响机理进行了分析。结果初步验证了这几种添加剂的抗磨机理和对疲劳寿命可能的影响,也确定了其摩擦学性能差异的原因。     

CNG/汽油两用燃料发动机油低温性能试验研究

对几种降凝剂在同一种基础油中的倾点、表观粘度、边界泵送温度进行了探讨,来满足CNG/汽油两用燃料发动机油低温性能的要求。试验结果表明:对试验所选定的基础油,T803B、T811具有良好的感受性,T602的感受性较差,由T803B与T811按照1∶1的比例复合,具有较好的协同效应,在同等低温性能要求的条件下,可以显著减少降凝剂的添加量。     

甲醇汽油发动机油抗乳化性试验研究

甲醇汽油中甲醇吸水性强,要求甲醇汽油发动机油具有好的抗乳化性能。采用石油和合成液抗乳化性能测定仪研究抗乳化剂T1001、C405与清净分散剂、抗氧抗腐剂在基础油中的抗乳化性能。试验结果表明,T1001与基础油的感受性能良好,与分散剂、抗氧抗腐剂有协和作用,但与清净剂复配时产生沉淀;C405与清净分散剂、抗氧抗腐剂复合时的抗乳化性能比单独使用C405时有所降低。因此在研制甲醇汽油发动机油时,清净分散剂、抗氧抗腐剂与抗乳化剂复配时需慎重。     

金刚石砂轮电解修整磨削液的防锈性能研究

分析几种防锈添加剂对金属结合剂金刚石砂轮电解修整磨削液防锈性能的影M向，通过试验确定了几种防锈添加剂的合理含量，以及不同氯化钠电解液浓度所对应的各类添加剂含量。论文确定了金刚石砂轮电解修整磨削液的基本组成，并进行了电解修整磨削液的电解性能试验。     

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.     

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.     

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%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.     

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...     

OPTIMIZATION METHOD ON IMPELLER MERIDIONAL CONTOUR AND 3D BLADE

An optimization method for 3D blade and meridional contour of centrifugal or mixed-flow impeller based on the 3D viscous computational fluid dynamics (CFD) analysis is proposed. The blade is indirectly parameterized using the angular momentum and calculated by inverse design method. The design variables are separated into two categories: the meridional contour design variables and the blade design variables. Firstly, only the blade is optimized using genetic algorithm with the meridional contour remained constant. The artificial neural network (ANN) techniques with the training sample data schemed according to design of experiment theory are adopted to construct the response relation between the blade design variables and the impeller performance. Then, based on the ANN approximated relation between the meridional contour design variables and impeller performance, the meridional contour is optimized. Fewer design variables and less calculation effort is required in this method that may be widely used in the optimization of three-dimension impellers. An optimized impeller in a mixed-flow pump, where the head and the efficiency are enhanced by 12.9% and 4.5% respectively, confirms the validity of this newly proposed method.