基于AMESim的液压传动教学方法研究

简述了《液压传动》课程教学中使用仿真技术的基本情况,以液压溢流阀元件为例说明在教学过程中利用AMESim仿真平台构建液压元件及其动态特性分析的操作方法。AMESim仿真技术在教学中的运用可以有效提升教学效果,增强学生对理论知识的理解和解决实际问题的能力。     

AMESim软件在液压控制系统教学中的应用

针对《液压控制系统》课程理论性强,涉及面广,内容抽象等特点,在教学中引入AMESim仿真软件,以力反馈两级电液伺服阀为对象进行建模仿真,阐明了AMESim软件在本课程教学中的应用,达到了促进学生对抽象知识的理解和掌握,激发学生兴趣,提高教学水平及学生的工程实践能力的目的。     

仿真技术在"液压传动技术"课程教学中的应用研究

针对职业教育"液压传动技术"课程教学中存在的理论推导繁琐、液压元件结构复杂、液压回路工作原理抽象,导致学生学习难度大和综合实践能力培养不足等问题,以UG和AMESim软件联合引入"液压传动技术"教学中的应用为研究对象,并以齿轮泵、差动连接的快速运动回路为例对教学过程中的同步应用教学方法进行了设计.研究表明将UG和AME...     

液压仿真技术在液压传动教学实践中的应用

为解决《液压与气压传动》课程流体力学部分教学难点的问题,采用AMESim软件针对油液的物理性质、静力学、运动学和动力学规律建立流体属性仿真模型、液体静压力仿真模型、流体连续性原理仿真模型和孔口流量仿真模型。将其引入到教学过程中,通过可视直观的曲线图和数据,让学生更加深刻地理解相关理论与公式。实践表明:将AMESim仿真技术引入到课程教学过程中,相对于常规教学,学生的考勤率平均提高3.13%,上课抬头率平均提高14.88%,课堂表现更加优秀。通过该课程教学改革增强了教学的直观性,加强学生对知识的理解,充分调动了学生学习积极性,提高了学习效率,提升了课堂教学质量。     

液压专业课的虚拟仿真实验教学

实验教学是液压专业课程的重要环节。针对传统液压实验教学资源不足等问题,采用AMESim和Automation Studio软件开发虚拟仿真实验,并应用于实验教学中。实践表明,仿真实验拓展了现有实验内容的深度和广度,丰富了实验教学资源和教学形式,与实物实验优势互补,相互验证。仿真实验的实施,有利于学生理解抽象的专业知识,培养学生进行实验设计和实验调试等综合能力,调动学生参与实验的积极性和主动性,提高实验教学质量和教学效果。     

基于AMESim-Simulink联合仿真的风电回转支承实验台液压加载系统研究

结合风电转盘轴承实际工况下的受载情况,为验证所设计液压加载系统的可行性和改善系统的动态响应性能,设计出风电回转支承实验台液压加载系统。在AMESim中建立液压加载回路的仿真模型,所采用的BP神经网络PID控制器以S函数的形式导入到Simulink中的系统模型中,进行AMESim和MATLAB/Simulink联合仿真研究,并与传统PID控制的同一系统进行AMESim仿真对比。仿真结果表明,所采用的液压加载系统能够模拟出风电转盘轴承实际工况下承受到的载荷,BP神经网络PID控制改善液压加载系统的响应性能。     

轮式起重机控制驾驶室俯仰液压系统AMESim的仿真与优化

为提高QLY轮式起重机控制驾驶室俯仰液压系统(简称:QLY起重机驾驶室液压系统)性能,该文介绍了QLY起重机驾驶室液压系统工作原理,并在此基础上对QLY起重机驾驶室液压系统系统进行分析,利用AMESim软件对QLY起重机驾驶室液压系统建立模型,对QLY起重机驾驶室液压系统的参数进行设定,通过系统模型进行动态特性仿真,并且,通过理论计算验证了AMESim仿真的可行性,通过分析结果,来优化和完善QLY起重机驾驶室液压系统,同时为同类型产品提供设计依据。     

汽车EHB系统控制策略研究

为了提高汽车线控液压制动系统的动态响应特性,在分析了线控液压制动系统工作原理的基础上建立其数学模型以及AMESim液压模型,提出了遗传算法优化PID控制策略和模糊自适应PID控制策略。基于AMESim与Matlab/Simulink软件搭建系统联合仿真研究平台,通过分析相同输入信号下实际制动轮缸压力曲线来研究线控液压制动系统在两种控制算法下的动态响应特性。结果表明遗传算法优化PID控制策略比模糊自适应PID控制策略下的系统响应时间少0.1s,前者更有助于提高线控液压制动系统的响应特性。     

基于AMESim的液压位置伺服系统仿真

介绍了AMESim软件及其特点,并应用该软件对四通道静力协调加载系统中的一个通道即液压位置伺服系统进行了模型搭建、参数选择和仿真分析。该系统是一个典型的闭环控制系统,其中包括比例放大和反馈。结果表明,应用AMESim软件能较好地解决液压系统动态仿真问题。     

基于AMESim的雷达天线车液压调平系统仿真研究

简述了液压仿真软件包AMESim的性能和特点,以雷达天线车液压调平系统为例,在AMESim环境中进行建模和动态仿真,通过对仿真结果的分析,验证了该模型的正确性,并应用AMESim软件对系统加以优化,有效地指导了设计.     

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...     

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.     

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。     

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...     

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。     

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。     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

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.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

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.