ERF减振器的模糊控制系统设计

电流变流体是一种新型的智能材料,在本论文中,将其作为减振器的阻尼介质,设计了一种新型的ERF减振器,并针对这种ERF减振器,设计了相应的模糊控制算法,最后用MCS-51单片机和协处理器F200模糊控制芯片构成了单片机模糊控制减振系统。     

汽车悬架磁流变减振器的优化设计及仿真

基于磁流变减振器在汽车悬架减振系统半主动控制中的广泛应用,根据磁流变液的特点和磁流变减振器阻尼力与结构参数的关系,设计了新型的磁流变减振器,并对影响磁流变减振器性能的参数进行了优化和仿真.仿真计算表明,该磁流变减振器设计是一种能优化阻尼力的有效算法.     

磁流变减振器磁路结构的参数化优化设计

磁流变减振器是一种新型智能减振装置,而磁流变减振器的磁路结构是磁流变减振器设计的重点,在磁流变减振器磁路结构设计中引入有限元分析的优化设计过程,介绍了ANSYS的参数化编程语言APDL及其在磁路结构优化设计中的应用,并针对某一磁流变减振器的磁路结构运用APDL语言对其进行优化设计。分析结果显示,运用APDL语言对磁流变减振器的磁路结构进行优化设计后,间隙处的磁感应强度明显增加,磁场分布更加合理,是一种有效的磁路优化设计方法。     

回转叶片式磁流变减振器的结构设计与建模分析

对回转叶片式液压减振器进行了结构改造,设计了一种新型的磁流变减振器,还进行了阻尼力的理论建模,对其阻尼特性作了理论分析,在此基础上对减振器的结构设计提出了改进,对阻尼力的理论模型加以修正。     

新型液电馈能式汽车减振器的设计

采用机电液耦合系统,设计了一种新型液电馈能式汽车减振器。这一减振器将直线往复运动转换为液压马达旋转,推动发电机产生电能,实现能量回收。这一减振器结合了电磁式减振器和液压式减振器的优点,既具有电磁馈能的高效性,又具有液压系统布置的灵活性。对新型液电馈能式汽车减振器的工作原理进行了分析,通过试验验证了这一减振器设计的可行性。     

一种新型电流变减振器力学模型仿真研究

设计了一种新型的基于混合模式的电流变减振器,并建立了该减振器的力学模型,利用MATLAB＋SIMULINK对其阻尼特性进行了仿真,结果表明,该减振器具有良好的减振特性。     

一种基于电磁弹簧的智能减振器设计与研究

针对现有参数可调式减振器结构的不足之处,设计了一种基于电磁弹簧的智能减振器,该减振器采用动力吸振器原理,可通过自主调节自身频率以适应多种工况.首先,设计了一种新型的电磁弹簧结构,通过仿真优化了电磁弹簧的结构,确定了电磁弹簧模型;然后,基于该电磁弹簧模型,设计了一种刚度可调的智能减振器装置,并对该智能减振器装置的减振性能...     

回转叶片式磁流变减振器的结构设计与健康分析

对回转叶片式液压减振器进行了结构改造，设计了一种新型的磁流变减振器，还进行了阻尼力的理论建模，对其阻尼特性作了理论分析，在此基础上对减振器的结构设计提出了改进，对阻尼力的理论模型加以修正。     

液压减振器热-机耦合研究现状与展望

为总结和分析汽车液压阻尼减振器热-机耦合建模与优化设计的研究进展和发展趋势,首先分析了减振器温升对减振器阻尼特性、结构寿命及整车性能带来的危害,进而从减振器热-机耦合模型的建立、带有温度补偿的新型减振器设计以及半主动控制方法等几方面进行了综述。提出了切实可行的减振器热-机耦合研究技术路线,即建立热-机耦合模型、基于热-机耦合模型的减振器优化设计、基于整车性能的悬架优化设计以及基于温度补偿的新型减振器设计,最后指出设计具有应用级别的馈能式减振器是解决温升危害的一种有效途径。     

新型三级刚度扭转减振器设计开发及性能分析

针对车辆爬行工况下发生的严重变速器齿轮敲击问题,设计开发新型三级刚度扭转减振器,并通过专用台架试验和实车试验验证了三级刚度扭转减振器性能。首先,基于传统从动盘式扭转减振器结构特点,设计新型三级刚度扭转减振器机械结构并阐明其工作原理;其次,利用专用台架试验,测试得到从动盘式扭转减振器和新型三级刚度扭转减振器扭矩传递特性,验证三级刚度扭转减振器机械结构设计和性能参数设计的有效性;最后,设计实车道路试验,包括试验测试流程和传感器布置方案,综合试验信号时域、频域和时频域结果,对比分析传统从动盘式扭转减振器和新型三级刚度扭转减振器减振性能。结果表明,该新型三级刚度扭转减振器可有效解决原车在爬行工况下传动系统剧烈的扭转波动和变速器齿轮敲击问题。     

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.     

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。     

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....     

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.