基于改进遗传算法汽车动力传动系统性能仿真软件

探讨了建立发动机燃油经济性和排放性能模型、定义汽车运行循环、预测汽车动力性燃油经济性和排放性能,介绍了自主开发的VDS车辆动力学软件.通过实车道路和底盘测功机的性能试验对VDS软件进行验证.     

基于改进遗传算法汔车动力传动系统性能仿真软件开发

探讨了建立发动机燃油经济性和排放性能模型、定义汽车运行循环、预测汽车动力性燃油经济性和排放性能，介绍了自主开发的VDS车辆动力学软件。通过实车道路和底盘测功机的性能试验对VDS软件进行验证。     

考虑排放约束的汽车动力传动系的优化匹配研究

基于GT-drive软件建立汽车整车仿真模型,并利用多目标优化设计软件mode FRONTIER与GT-drive软件联合构建汽车动力性、燃油经济性的双目标优化模型,在此基础上兼顾排放约束对某中级乘用车的动力传动系进行优化匹配,得到一组关于各挡速比与主减速比的Pareto解集(多目标规则问题的有效解)。根据研究车型的具体设计选取合适的解进行分析,结果表明:优化后的汽车在动力性、经济性和排放性能方面均得到了不同程度的改善。     

基于ADVISOR的汽车燃油经济性对比分析

燃油经济性是电动汽车优于传统汽车的一个重要方面。以混合动力汽车以及传统汽车为例,采用ADVISOR软件在美国UDDS工况下对两种车辆进行燃油经济性分析,得出混合动力汽车和传统汽车的燃油消耗。并对仿真结果进行深层分析,研究两种汽车的经济性能。     

轿车自动无级变速器的试验研究及其试验装置的开发

燃油经济性和较少的有害气体排放和日益增大的舒适性等要求是现代汽车十分重要的研究课题,ＣＶＴ已经从理论上回答现代汽车设计所需迫切解决的很多问题,其主要优点是改善了汽车性能,燃油消耗和排污。     

插电式并联混合动力汽车遗传模糊控制策略优化设计

以提高插电式混合动力汽车燃油经济性和排放性能为目标,设计了能够实现需求转矩在发动机和驱动电机之间合理分配的模糊控制策略,并详细介绍了遗传算法优化模糊控制规则的方法。优化结果表明,优化后的模糊控制策略较优化前提高了燃油经济性和排放性能,并使发动机工作点较好地集中在高效区域。研究内容可为操作者和专家制定模糊控制规则提供有效的手段。     

基于ADVISOR的混合动力公交车经济性仿真

混合动力汽车是目前解决环境污染和能源问题切实可行的方案。基于Advisor软件,先确定动力混合形式,在根据其各个性能的要求对发动机、电机等部件进行参数设计及整车建模。采用功率跟随式控制策略,在仿真软件Advisor里将各参数输入,并且修改相关控制策略,最终得到仿真结果。其结果表明与传统内燃机汽车相对比,串联式混合动力汽车无论是在动力性还是在燃油经济性和排放性能上面都有着较大的优势。     

汽油机涡轮增压与废气排放控制

涡轮增压技术与废气排放控制系统的结合,使汽油机的动力性能和燃油经济性能提高到一个新水平,废气涡轮增压技术在提高汽油机动力性能的同时,可以降低排放废气温度,降低排气噪音,改善燃油经济性,减少排放污染。结合目前采用废气涡轮增压技术的小排量汽车日益增多,维修中时常遇到涡轮增压器与废气排放系统相关联的故障,要解决这类问题就必须清楚其工作原理。     

新型CVT的开发与展望

现代汽车十分重要的研究课题是燃油经济性，较少的有害气体排放和日益增大的舒适性等要求。新型ＣＶＴ将可起到十分重要的作用．ＣＶＴ已经从理论上回答了现代汽车设计所需迫切解决的问题，其主要优点是改善了汽车性能、燃油消耗和排污。本文将讨论ＣＶＴ有关开发情况和未来的发展趋势。     

双离合器自动变速器整车建模与性能仿真

基于AVL/CRUISE性能仿真软件对配备了双离合器自动变速器(DCT)的汽车进行了整车建模,并进行了动力性与燃油经济性的仿真分析。与配备传统机械变速器(MT)汽车进行了性能对比分析,得到如下结论:在UDC循环工况下,配备DCT汽车比MT汽车燃油消耗增加了3.58%,动力性提高了1.9%。     

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...     

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。     

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。     

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。     

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%.