小型风力发电技术探讨

风能利用是未来新能源利用的一个重要发展方向。介绍了小型风力发电技术，包括小型风力发电机的系统、结构组成、优点，以及系统的选择与选址，最后重点介绍了风光互补系统，展望了小型风力发电的发展长景，认为其将来会有极广的应用。     

欧姆龙PLC在数控剪床中的应用

介绍了采用小型PLC、触摸屏、步进系统组成剪床的数控系统,并提供了在应用中所遇到的硬件接口数据及软件流程等。     

基于PLC的闸门流量自动控制系统

本文概述了闸门流量控制及系统组成原理.给出了数据采集与转换线路,弥补了小型PLC数据显示的不足.     

基于PIC单片机空间定位系统的设计

提出了一种利用PIC单片机作为开发平台构建小型智能化的空间定位系统的方案。通过将采集到的多种数据发送到单片机。利用单片机对采集到的数据进行处理和显示。同时用软件查询的方式实现了多种中断之间的相互嵌套。并和上位机进行通信来实现系统的网络化。本控制系统充分利用了PIC单片机的软硬件资源。使系统更加智能化和小型化。同时实现了网络化的功能。     

小型风光互补电源与上位机数据通讯和储存的设计

为了便优化风、光发电设备的容量匹配,同时有效降低成本,小型风光互补电源须拥有数据通讯和储存的功能。本文在分析PLC通讯协议和数据提取、存储的基础上,通过VB语言编程,实现了小型风光互补电源系统的数据通讯和储存功能。     

小型矿井提升系统的设计

比较了不同类型和配置的提升系统对小型矿山的适用性，从滚筒质量、电动机尺寸、材料选择等方面对小型提升机部件的尺寸和规格进行了计算。实践表明，小型矿井提升系统的投入使用降低了成本，延长了部件的使用寿命，提高了生产效率和安全性。     

基于FPGA的大气数据采集系统的设计

大气数据的采集是影响无人机飞行控制的主要因素,为了实现对该信号源的采样,根据大气数据的高度和空速的测量原理,选用简易小型空速管作为采样通路,采用芯片级动压和静压传感器作为信号源,设计了基于FPGA的大气数据采集系统,并且在DSP处理器上实现对数据的算法处理。最后通过在某小型无人机上的飞行试验结果表明,该大气数据采集系统能够实现对空速和气压高度的获取。     

基于Modelica/Dymola的小型燃气轮机建模与仿真

为了研究小型燃气轮机在不同环境下的动态特性,采用模块化建模方法,并根据质量和能量守恒原理,对小型燃气轮机进行了合理划分,建立了压气机、燃烧室、透平等单元部件的数学模型,并将这些部件划分为容积模块和流动模块.采用面向对象的、多领域的物理系统建模语言Modelica和Dymola编译器编制了各部件的仿真程序,建立了SmallGasTurbine通用模型库,以方便不同结构系统的小型燃气轮机的模型搭建.以川崎M1A-13D、M7A-01小型燃气轮机为例,搭建了它们的系统模型,将厂家给定基本数据与仿真结果进行了对比.研究结果表明,小型燃气轮机模型模拟仿真误差较小,具有很高的精确度.     

微机励磁在水轮发电机组中的应用

针对中小型水轮发电机组的常规模拟式励磁装置现况，进行革新改造。采用微机励磁系统控制技术，以提高系统运行可靠性和稳定性，减小劳动强度，实现数据传送和远程控制为目的，并随着中小型水电站对自动化需求的不断提高，微机励磁技术取代传统的励磁装置将是必然选择。     

小型无人机地面监控系统软件设计与实现

针对小型无人机飞行监测和控制的任务需求,设计了一种地面监控系统软件.系统实现了导航参数实时获取、飞行控制参数在线调整、航迹规划与回显、数据存储及分析等功能,并为超视距飞行提供了有利保障.经大量完全自主飞行实验结果表明,所设计的监控系统软件不仅能够满足小型无人机下行信道传输数据量大的监测要求,而且可以确保上行信道控制参数高精度、高可靠性的要求.     

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.     

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.     

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。     

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.     

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.