直升机燃油泵测试系统的研究与设计

介绍了某型直升机燃油泵测试系统的工作原理和特点,并利用PLC和触摸屏技术设计了该装置的控制分系统.结果表明本测试系统设计合理,达到了预期的设计目标.     

电驱动燃油泵通用测试装置的设计与实现

针对仓储中心不仅储存品种多、数量大的电驱动燃油泵,而且缺乏通用综合型的电驱动燃油泵检测设备,致使燃油泵库存期满后无法实现性能检测,只能返回承制厂处理的现实难题。该文首先简要介绍了电驱动燃油泵的功用和工作原理,在此基础上,详细说明了流体测试系统的的基本组成和特点,利用平板电脑、PLC、智能调节阀和比例调节阀技术设计了该装置的电控系统,给出了电控系统的硬件、软件和操作界面的实现方法。实际应用表明:该测试装置能够满足电驱动燃油泵性能的测试要求,测试精度和效率高,可靠性强,结构科学合理,操作界面友好,可为产品性能检测提供有力的技术支持。     

燃油泵电刷架装配质量检测试验台开发

分析了电动燃油泵电刷架在装配过程中电刷组件弹簧压力对燃油泵性能和使用寿命的影响，开发了其性能自动检测试验台，并详细介绍了检测试验台的机械设计部分和系统控制设计部分。     

电动燃油泵叶轮间隙测试误差分析

叶轮间隙的大小直接影响燃油泵的性能,对叶轮间隙测试系统的机械结构进行设计并对误差作出分析,阐述了叶轮间隙检测装置的评定方法,为同类测试设备的验收评定提供了依据.试验结果表明:该测试装置测试性能稳定可靠,测试精度满足设计要求.     

基于单片机的汽车发动机电动燃油泵在线检测系统开发

针对某公司生产的电动燃油泵产品出厂检测的需要,对电动燃油泵性能检测系统进行了深入的研究,基于单片机技术,开发了电动燃油泵在线性能检测系统。系统具有数据采集、处理、储存、统计分析及动态显示功能。结合生产实际,进行了实测验证,结果表明,汽车发动机电动燃油泵经2500小时的耐久性试验后,电流误差2%,流量误差(4~4.6)%,符合国家标准中的相关规定。系统既可用于产品在线检测,也可用于新产品的性能曲线分析,具有测试效率高、功能齐全、运行稳定、实时性强和维护方便等特点。     

基于模糊控制的容积式泵工作性能测试系统研究

针对植保机械用容积式泵工作性能测试系统中环境、温度、水质的不确定性和满足分级测试的需求问题,设计了以气动隔膜调节阀、进出水回路调节系统等部件组成的测试系统,并运用质量法进行了测定。研究了在测试过程中如何调节气动隔膜保持容积式泵出水压力恒定的控制方法,提出了一种自适应模糊PID控制策略,设计了模糊PID控制器,并应用于基于组态软件、可编程控制器和高精度仪表的恒压力控制系统;通过PLC编程,分别实现了传统PID控制和模糊PID控制,并对两种控制方法分别进行了测试。研究结果表明:与传统PID的测试系统相比,基于模糊PID的测试系统响应速度快,超调量降低近20%左右,工作效率提升近30%左右,各项指标均符合测试要求,且测试系统稳定可靠。     

基于PLC模糊控制的异步电动机变频调速改造研究

目前用异步电机实现同步控制已经成为一种趋势.采用PLC变频调速方式及模糊PID补偿控制器来实现异步电机的同步控制,实现基于模糊PLC控制的异步电机变频调速改造.对改造后的系统进行测试,结果表明设计的系统同步效果良好.     

基于LabVIEW的汽车燃油泵输油性能测试系统

为对汽车燃油泵输油性能进行准确和有效的检测,以虚拟仪器技术、电子技术和控制技术为基础,以LabVIEW为软件开发平台,结合相关功能硬件研制出了汽车燃油泵真空度法测试系统。系统根据发动机转速调整燃油泵工作电压,通过测得的负压值判断燃油泵输油性能,以数字和虚拟仪表图形两种数据形式动态显示被测参数值变化。试验结果证明,系统具有采集数据实时性好、更新维护方便和自动化测试程度高的优点,可以作为汽车燃油泵性能检测的一种新思路。     

基于PLC的轴承测试液压伺服加载系统PID控制

轴承是测功机的关键零件,其性能好坏直接影响测功机的测试精度和工作可靠性。为了测试轴承性能,设计了一套基于PLC控制的液压伺服加载系统。阐述了测试加载系统的构成,完成了液压系统原理图的拟定,利用伺服控制技术控制加载力,明确了控制系统的软硬件设计,设计了PLC输入输出点分配和扩展模块的端子接线,应用PID控制策略对PLC进行关键程序编程。系统采用闭环控制关键量,精度高、反应快,能够满足轴承加载测试的需要。     

基于LabVIEW的PLC I/O模块测试

基于LabVIEW和施耐德电气的PLC产品搭建了一套自动测试系统,对PLC的I/O模块进行数据采集,测试其精度性能。整套系统的关键在于使用LabVIEW完成PC对PLC以及DC电源和数字万用表之间的控制。实验证明,系统能实现自动化测试。     

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...     

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.     

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.     

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。     

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.     

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...