磁流变阻尼器的磁场分析

基于商用有限元分析软件,探讨单级和双级磁流变阻尼器的磁场特性.研究同样参数条件下双级磁路与单级磁路对磁流变阻尼器性能的影响,对比了不同结构参数、不同条件下的单级、双级磁流变阻尼器磁场分布的不同,从而系统研究了影响磁流变阻尼器磁场性能的各种结构参数及其贡献.可以用于指导磁流变阻尼器的设计.     

三工作面旋转式磁流变阻尼器磁路设计与性能分析

设计了一种新型结构的旋转式磁流变阻尼器。设计了新的磁流变阻尼器磁路结构,使得转子的两个端面和圆柱面均作为工作面,在不增大转子体积的情况下,有效增加了转子的工作面积。基于磁流变液与磁芯材料特性,对阻尼器进行了磁路设计,获得了阻尼器的相关机械参数与电气参数。针对阻尼器结构特点,应用有限元法,建立了磁流变阻尼器的有限元模型,并对其进行了电磁场分析,得到了阻尼器模型的电磁场物理量。结合有限元分析结果与磁流变液的本构关系,获得了磁流变阻尼器的屈服力矩—电流力学特性。     

剪切阀式磁流变阻尼器实用设计方法研究

建立了一种基于经验的剪切阀式磁流变(MR:magnetorheological)阻尼器简化设计方法,在阻尼器磁路设计中先参考已有设计预设阻尼通道长度和修正系数,并将结构设计的基本方程与各磁场通道同时饱和原则相结合确定阻尼器结构的基本参数。分析了MR阻尼器各主要性能指标和设计参数间的关系,提出一种针对剪切阀式MR阻尼器的体积最优的3变量优化模型,并对设计的阻尼器进行了数值模拟和试验研究。结果表明,此简化设计方法简便、有效,可作为剪切阀式磁流变阻尼器工程设计的一种实用方法。     

磁流变阻尼器优化设计与性能分析

利用磁流变液这种智能材料的力学性能 ,制作了一种双出杆磁流变阻尼器。文中主要讨论了磁流变阻尼器结构设计、磁路设计的基本原理 ,并讨论了结构参数对磁流变阻尼器性能的影响 ,最后优化设计了磁流变阻尼器的结构参数 ,给出了磁流变阻尼器结构参数的匹配关系     

磁流变液阻尼器的磁路设计方法

磁流变阻尼器因其优越的性能，在汽车制造业、建筑业都具有潜在的巨大商业应用价值。在对磁流变阻尼器的磁路设计进行理论分析的基础上，建立一套比较完善且有效的磁流变阻尼器的磁路设计方法。本文所涉及的磁流变液阻尼器主要应用于车辆悬架的半主动振动控制。     

磁流变弹性体阻尼器的设计及磁路分析

针对高速切削加工过程中产生振动的情况,基于剪切模式,设计了一种磁流变弹性体阻尼器,针对磁流变弹性体阻尼器的典型磁路结构,阐述了磁路设计原理,研究了磁路计算方法,并利用ANSYS软件对其磁路结构进行了分析验证。仿真结果的分析有助于优化磁路结构,使所设计的磁流变弹性体阻尼器的磁场效能得到最大的发挥。     

磁流变智能阻尼器的工作原理及设计

介绍了磁流变智能阻尼器的结构和工作原理，重点从线圈缠绕方式、结构参数和磁路设计等方面对磁流变阻尼器设计中应注意的一系列关键性技术问题作了详细归纳，并对已设计出的阻尼器进行了实验，分析了磁流变阻尼器的性能，进一步验证了设计方法的有效性和正确性.     

基于ANSYS的磁流变阻尼器设计技术研究

利用磁流变阻尼器具有响应快、稳定性好、阻尼力连续可调的优点,作为理想的气动控制元件。设计了一种新型阻尼器。建立了阻尼器力学模型与磁路结构,并用ANSYS软件对其结构参数进行了仿真。结果表明,合理地选择阻尼器结构参数可使之达到较好的控制效果。     

轴向绕组磁路结构磁流变液阻尼器设计

给出轴向绕组磁路结构磁流变阻尼器的设计方法,通过判定线圈横截面积与线圈槽横截面积相等,将阻尼器结构设计与磁路设计联系起来,设计出结构合理紧凑的阻尼器。然后采用ANSYS软件对磁路结构进行电磁场有限元分析,分析表明阻尼器结构设计满足要求,轴向绕组磁路结构改善了阻尼间隙通道磁场分布。     

磁流变阻尼器磁路设计与性能的相关性研究

通过对磁流变阻尼器的电磁学数值模拟,研究了磁路设计与磁流变阻尼器性能的相关性.磁流变阻尼器的台架试验结果表明,数值模拟结果与试验数据吻合良好,并据此提出通过数值模拟指导阻尼器磁路结构改进的方法.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.