汽轮发电机基座底板大体积混凝土温控技术

茂名电厂5#机汽轮发电机基座底板为大体积混凝土，为确保混凝土质量，需要对混凝土进行温度控制，在施工过程中，通过采取合理施工工艺以及采取有效的温控措施，混凝土没有出现温度裂缝，确保5#汽机施工质量。     

砼温度应力计算理论在地下室裂缝控制中的应用

结合工程实际，运用砼温度应力计算理论，对大体积浇筑地下室底板砼，在凝结养护过程中所产生的温度收缩应力的计算。估量砼浇筑后可能产生的最大温度收缩应力，及自然养护条件下7天时的温度收缩应力，并采取有效措施，控制温度收缩应力对地下室底板砼裂缝的影响。     

不可压缩湍流的多尺度方程组

The short-range property of interactions between scales in incompressible turbulent flow was examined.Some formulae for the short-range eddy stress were given.A concept of resonant-range interactions between extremely contiguous scales was introduced and some formulae for the resonant-range eddy stress were also derived.Multi-scale epuations for the incompressible turbulent flows were proposed.     

谁与素质教育过不去

素质教育的涵义，素质教育真正死敌是工具教育，对应试教育的理解，素质教育是以教育目的的为特征的大一统的教育。     

高炉冷却壁工作状态下的温度场与热应力分析

在对高炉冷却壁工作状态下的温度场和热应力分布的分析和对其破损机理认识的基础上，使用开发的有限元程序在586微机上计算，掌握了冷却壁工作状态下的温度场和热应力分布，进而对灰口铸铁和球墨铸铁、铸钢等不同冷却壁材质的等效应力和最大热应力进行比较和分析，据此提出高炉冷却壁设计的一些改进性建议。     

重载焊接机器人刚度与变形分析

本文对重载焊接机器人的传动系统进行分析,从其减速器、齿轮副、传动轴和伺服电机进行理论计算,求出各个传动机构的刚度。对机器人的大臂和小臂进行受力分析,求出所受力的大小。通过Simulation软件对应力变形进行了分析验证,为重载焊接机器人在性能分析和结构优化中提供理论基础。     

基于有限元分析的输电铁塔实时应力计算系统

提出了基于有限元分析的输电铁塔应力计算方法,并开发了输电铁塔实时应力计算系统。采用桁梁混合模型对输电铁塔进行建模,对铁塔结构进行离散化,以节点位移阵列作为未知量,与整体刚度矩阵,载荷阵列组成矩阵方程,采用置1法消除整体刚度矩阵的奇异性,运用高斯消元法求解节点位移矩阵,根据弹性力学中应力与位移的关系,给出各节点应力,最终求出铁塔受力情况。通过自主开发的输电铁塔实时应力计算系统反演了铁塔的倒塔事故。分析结果表明,该系统具有较高的计算精度,可用于输电铁塔实时应力计算。     

处理数学教材应力求"四化"

走进课程改革的实践中,作为教学一线的教师常常因教材的呈现方式与课标的要求相矛盾而大伤脑筋.     

Stress uniformity process of specimens in SHPB test under different loading conditions of rectangular and half-sine input waves

Based on the characteristics of 1D waves,the stress uniformity process in specimens under different loading conditions of rectangular and half-sine input waves was analyzed in split Hopkinson pressure bar (SHPB) test.The results show that the times of an elastic wave propa-gating from one end to the other in a specimen to attain stress equilibrium,is related to input wave-forms and relative mechanical impedance between the specimen and the input/output bars.Here-into,with the increae of the relative impedance,the times decreases under rectangular input waves loading,while it increases under half-sine input wave loading.The dimensionless stress value of specimen corresponding to the status of stress equilibrium increases with the increase of the rela-tive mechanical impedance.However,the dimensionless stress value under half-sine input wave loading is significantly lower than the value under rectangular input wave loading for specimen with low mechanical impedance,and the relative differentia of the dimensionless stress values under two loading conditions decreases with the increase of the relative mechanical impedance.In gen-eral,the forced state of specimen with relatively low mechanical impedance under half-sine input wave loading is evidently superior to the state under rectangular input wave loading in SHPB test,and the advantages of forced state under half-sine input wave loading turns weak with the increase of the relative mechanical impedance.     

建筑结构工作应力检测新方法

依据局部应力释放原理,提出建筑结构工作应力测试的新方法——局部应力解除法,与其它方法相比,该方法具有操作简便、测试精度高、费用低、不受现场环境条件影响等优点,适用于建筑物中各种钢结构构件和钢筋混凝土结构构件中钢筋的实际工作应力检测。