包头体育中心体育馆暖通空调设计

根据建筑功能要求,考虑北方严寒干燥地区冬、夏季空调系统的特点,在满足设计参数的前提下,进行了方案优化比选.对比赛大厅空调系统进行CFD计算模拟的结果表明,该空调系统在满足使用功能的同时,达到了经济合理、环保节能的要求.     

蒸汽喷射泵设计计算程序设计

在对蒸汽喷射泵的工作过程具体描述和分析的基础上,建立蒸汽喷射泵设计的简化计算数学模型,并通过编程迭代计算的方法,获得蒸汽喷射泵设计中所需要的一些重要尺寸参数,从而为设计提供一种便捷的计算方法。     

A textile- based optical fiber sensor design for automotive seat occupancy sensing

In our previous publications, the response of perfluorinated (PF) graded index (GI) POFs (62.5/750, 62.5/490 μm) to bending, tensile loading, and cyclic loading was investigated. The results showed that Cytop-1 (62.5/750 μm) was more appropriate to be used as an optical fiber sensor for automotive seat occupancy sensing relative to Cytop-2 (62.5/490 μm). In this study, a textile-based optical fiber sensor was designed and the effect of automotive seat covering including face material and foam backing on a sensor’s performance was analyzed. The pressure interval under which the proposed POF sensor design could perform well was found to be between 0.18 and 0.21 N/cm², where PF GI POF (62.5/750 μm) was used as the POF material. The responses of the sensor in this interval were observed to be accurate and reproducible. The face fabric structure and the thickness of foam backing were not found to be significant factors to change the sensor response. Artificial neural network (ANN) was used for data analysis, and Qwiknet (version 2.23) software was used to develop ANNs. According to the results of Qwiknet, the prediction performances for training and testing data-sets were 75 and 83.33%, respectively.     

二维T-S波在壁面局部喷吸边界层流中的演化

采用壁面设置局部法向速度模拟喷吸条件,数值计算获得稳定的三维边界层基本流的数值解。在此基础上,研究不稳定的二维扰动T-S波在空间演化过程的非线性问题;探讨边界层壁面局部无量纲喷吸速度0.004,0.000 6对二维T-S波非线性演化的影响及其对增长率的贡献。数值计算结果表明,边界层平均流剖面的改变促进了扰动波的快速增长,增强了流体运动的不稳定性,扩大了中性曲线的不稳定区域范围,不稳定的二维T-S波获得了更大的增长率;不稳定的二维扰动T-S波在非线性演化过程中,由于非线性相互作用不断增强,逐渐诱导激发出三维扰动速度及高次谐波,其三维扰动基本波的流向波数和频率与二维扰动波的流向波数和频率相同;正、负相间流向涡及强剪切层已初步形成。     

门座式起重机门腿变形不均匀时的塔身倾角计算

建立了门座式起重机门座的空间力学模型，分析了由于荷载作用位置的非对称性造成门腿变形的非均匀性从而引起的门座顶平面及塔身的倾斜，并给出了此倾角的计算方法及计算公式。这将为门座式起重机的合理、精确设计，提供有益的参考。     

安钢2800中厚板轧机安装中的摊题及其解决方法的探讨

针对安钢2800mm中厚板轧机机架安装中所遇到的几个难题,从理论和实践分析,并提出解决的方法。     

Properties of Highly-Dense Iron‐Base Powder Metallurgy Materials Pressed without Zinc Stearate

The possibility of obtaining highlydense compacts by single pressing and sintering and the use of heatresistant solid lubricants (graphite, talc) instead of conventional lubricant was studied. It was shown that the addition of graphite is most effective to obtain highly-dense powder metallurgy materials since it substantially facilitates ejection of the part from the die and improves the mechanical properties.     

基于单片机MC68HC908的座椅后视镜电控系统的设计

本设计以MC68HC908单片机作为控制器,分别控制继电器和桥式电路驱动电机运动,从而控制汽车座椅和后视镜的运动,达到电动调节座椅和后视镜的目的。本文重点介绍了座椅以及后视镜电动系统的工作原理并给出了相关电路的设计。     

引进循环流化床锅炉15CrMo汽包管座与St45.8Ⅲ降水管厚壁异口径高压管道的焊接

引进芬兰的循环流化床锅炉，其汽包返包中国。降水管采用了德国碳素钢St45.8Ⅲ，与降水管相连的汽包管座采用了国产珠光体耐热钢15CrMo。该焊接头为高压、厚壁、异口径的焊接。文中介绍焊口所在的结构形式及工作条件，分析异种材料的焊接性能，并对其焊接及热处理工艺措施作了全面阐述。     

双座阀在电厂叠加式改造中的应用实践

介绍在背压汽轮机叠加式改造中 ,采用新型的大口径双座阀替代后置机的实践。图 1参 4