燃气灶点火定时开关的设计

设计制作一种机械式燃气灶定时开关,可以根据使用者预先设定的时间到时准确关闭,从而能够达到杜绝厨房安全隐患的目的。本设计利用外接的定时器对燃气灶进行时间控制,通过机械结构的传动准确关闭点火开关。其特点是工作稳定,受环境影响小,成本低,安装方便等。     

双级全预混燃气灶引射器的理论分析

提出的一种双级全预混引射器是燃气灶实现全预混燃烧的重要部件。以燃烧功率为3. 5kW的民用天然气燃气灶为例,建立了双级引射器的理论模型,分析了引射比、截面比、引射压差等对引射器性能的影响。结果显示:引射器存在一最佳截面比使被引射流体压差最高,最佳截面比随引射比的增加而增大,且不受引射压差的影响;被引射流体压差随引射器截面比的增大呈先快速增加后小幅下降的趋势,且受引射比和截面比的影响逐渐减弱。一、二级引射比分别为μ_1=1. 2、μ_2=9. 3时,双级全预混燃气灶引射器的最佳截面比为k_1=15、k_2=130,此时的引射器性能较好,结构较优。     

自动节能环保安全燃气灶的设计与应用

通过对市场上现有燃气灶的调查研究,提出了“锅起火灭,锅落火起”的节能新方案,火苗不会因为外界环境因素（风吹、水淋等）意外熄灭造成燃气泄漏;采用更方便快捷的点火方式,设计了更节能、环保、安全的优化机构。经过模型设计及试验分析计算,此新型燃气灶达到了节能、便捷、安全的效果。     

一种节能环保抽油烟机清洁装置的设计

该文设计了一种利用燃气灶未利用的废热产生高压蒸汽对抽油烟机内部油污进行清理的装置.它包括供水模块,蒸汽发生模块和除油模块.该装置弥补了现有蒸汽除油产品高能耗而且需要对抽油烟机拆卸后才能对其进行油污清理的缺点,是一种无需外加能源、装载在抽油烟机内部、不用拆卸且自动清理抽油烟机内部油污的高效蒸汽除污装置.     

大尺寸球面加工装置

球面加工一直是决定轴流泵产品质量的关键因素。充分利用卧式车床的结构特点，设计了一种新型的大尺寸球面加工装置，并对其结构特点、工作原理、使用注意事项进行了介绍。     

螺旋压力机上带锻件顶出结构的锻模设计

锻件生产中成品顺利出模有着重要的现实意义.文中通过带顶出结构模具的设计及改进,充分利用了现有设备,同时也为此类设备上锻模设计工作摸索出一种基本设计方法及思路,积累一些前期设计经验.     

带有延时熄火装置的家用燃气炉

目前所使用的家用燃气炉,主要由炉台、炉头、煤气管接嘴、电子打火器构成,为防止泄漏,燃气灶必须加装熄火保护装置.论文提供了一种能在使用中人为地事先设定燃烧时间,延时关闭煤气通路,避免因忘记关炉而发生事故的带有延时熄火装置的家用燃气炉.该设计已获国家实用新型专利.     

新型秸秆撕裂粉碎机的设计

目前食用菌生产的原材料资源不断开发,为了充分利用农业废料,设计了一种利用动定锯齿结构对稻草等秸秆进行较细撕切粉碎的加工机械,能够用作食用菌的原料,大大提高了稻草的利用率.     

活塞式制冷压缩机的参数化设计

提出一种基于约束网络图的参数化设计方法，并把它应用于活塞式制冷压缩机的计算机辅助设计。该方法可充分利用已有的压缩机同类产品的成熟结构，可减少活塞式制冷压缩机的设计绘图时间。     

一种密集移动车库的制造装配与调试

为解决传统自行车停车装置无法充分利用水平空间,基于密集书库的原理,设计了一种密集移动车库,该车库采用模块化设计,每个模块主要包括两大部件:停车固定装置和停车底板,其制造装配与调试主要围绕这两大部件展开,该停车装置能够充分利用水平空间,方便停车取车。文中介绍了密集移动车库的整体结构、制造方法、装配方式、调试过程以及密集移动车库的应用前景。     

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.     

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.     

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.