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对输入输出测量噪声干扰下连续Hammerstein模型进行参数重组处理,得到线性微分方程。利用小波调制函数对该线性微分方程进行调制积分处理,得到等价的代数方程。在研究调制函数对输入输出测量噪声影响的基础上,提出用广义噪声模型来处理输入输出测量噪声并提出调制广义最小二乘算法来实现代数方程的无偏参数估计。最后利用奇异值分解(SVD）方法获得Hammerstein模型参数。数字仿真和工业应用实例验证了所...
A close-form model for dispersion in shallow waves over varying shear current
Longitudinal dispersion coefficient waves steady shear
2010/9/26
The longitudinal dispersion coefficient of pollutants in a wave-steady current flow field (WCLDC) is theoretically quantified by deriving a stream function for the combined flow. The steady current pr...
Development of a Lowcost Hardwareintheloop Simulation System as a Test Bench for Antilocked Braking System
hardwareintheloop simulation(HILS) antilocked braking system(ABS)
2011/8/4
Nowadays validation of antilocked braking system(ABS) systems relies mainly on a large amount of road tests.
Kinematics Analysis of Mechanisms Based on Virtual Assembly
assembly constraint constraint degree eliminating element method
2011/8/3
Currently, virtual assembly technology has attracted increasing attention due to considerations of solving assembly problems in virtual environment before actual assembly in manufactory.
Methodology to Estimate Remaining Service Life of Steel Structure by Possibilistic Reliability Theory
steel structure system fuzzy fatigue damage possibilistic reliability
2011/8/3
Steel structure system of crane deteriorates over time due to environmental effects, material fatigue, and overloading. System structural reliability and remaining service life assessment methods are ...
Virtual Reality Toolkit for the Assembly of Nanotube-based Nano-electro-mechanical Systems
virtual reality nano-assembly nano-electro-mechanical systems
2011/8/3
Nano assembly and manipulation technologies are the basis for nano-electro-mechanical systems(NEMS). Atomic force microscopy(AFM) is widely used to manipulate nanotubes to assemble NEMS. Manipulating ...
纳米Fe3O4颗粒磁性的影响因素分析
纳米磁性液体 纳米Fe3O4颗粒 饱和磁化强度
2013/9/6
用化学共沉淀法制备了纳米Fe3O4颗粒, 研究了影响纳米Fe3O4颗粒磁性的因素. 设计了四因素三水平的正交实验, 对影响Fe3O4颗粒磁性的四个因素进行了分析比较, 得出影响最大的因素是Fe3+与Fe2+的摩尔比, 其次是反应前驱物铁盐的浓度, 再次是表面活性剂的用量, 影响最小的因素是碱的用量. 研究了碱和表面活性剂的滴加次序、陈化时间和搅拌速度对纳米Fe3O4颗粒磁性的影响, 并对Fe3O4...
Modeling and Verification of an Astronaut Handling Large-mass Payload
extravehicular activity inverse kinematics inverse recursive dynamics ADAMSTM
2011/8/3
The experiments on astronaut motions are difficult to conduct due to the limitation and high cost of constructing or simulating the microgravity environment of space. Therefore, the method of computer...
Characterization of the Elastic-plastic Region Based on Magnetic Memory Effect
metal magnetic memory plastic deformation magnetomechanical effect
2011/8/3
Detecting stress concentration, especially critical stress state leading to structure damage or failure, is one of the most important tasks of equipment diagnosis.
Inlet Recirculation Influence to the Flow Structure of Centrifugal Impeller
centrifugal compressor inlet recirculation flow field calculation
2011/8/3
Inlet recirculation is proved as an effective way for centrifugal compressor surge margin extension, and is successively used in some engineering applications. Unfortunately its working mechanism is s...
Purpose: This paper explores the barriers faced by Malaysian manufacturing companies in successfully
implementing the Supply Chain Management (SCM). The study has highlighted some pertinent factors
...
回转机械在线监测系统的开发
机械振动信号 电气参数 状态监测 故障诊断
2009/9/27
开发一套用于大型AC－DC转换设备的在线状态监测和故障诊断系统,该转换设备由一台同步电动机和两台直流发电机组成.监测系统从机组上拾取共13路振动信号,经分析处理,显示各路振动信号的机械图像,幅值,频谱,自相关函数等.当任何一路振动信号的幅值超过设定值时,监测系统将发出警告,并自动存储此前5～15 min的全部检测数据供进一步分析.监测系统同时还监测同步电动机的6路主电网信号.
针对遗传算法(SGA)存在求解精度与收敛速度间的矛盾,提出了一种自适应对称调和遗传算法(IASHGA),并将该算法用于水轮发电机组PID调速系统参数的优化设计,以系统的上升时间和超调量指标作为IASHGA算法的适应度函数;以四川某水电站的真实数据对经过优化后遗传算法PID控制规律进行计算机仿真.仿真结果表明,改进的算法较之常规遗传算法(SGA)和粒子群优化算法(PSO),不但提高了全局的搜寻能力...
三峡工程450t、500t门机抓梁液压系统
门机 抓梁液压系统
2009/2/23
三峡工程450t、500t门机抓梁液压系统是用于三峡坝区泄洪闸水下液压抓梁的装置。主要内容和特点：该液压装置由液压站15套、液压移轴装置24套(内装磁致伸缩位移传感器和电感式接近开关的特殊机电液一体化油缸)、定位信号装置24套、管线布置15套组成。三峡大坝有很多泄洪闸，当洪水来临时，将泄洪闸提起泄洪，泄洪完毕后，再将泄洪闸放下蓄水。三峡大坝要将水下100多米深，重达数百吨的泄洪闸提起放下采用的就是...
Creep transition of transversely isotropic thick-walled rotating cylinder
Creep Transition Transversely Isotropic
2010/9/27
Creep stresses for a transversely isotropic thick-walled rotating cylinder under internal pressure have been obtained by using Seth’s transition theory. Results obtained have been discussed numericall...