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Abstract: In this paper,the stress field in a long rectangle platen being upset(after bulge profile emerging)is resolved by mathmatic analytic metho d,the tension stress zones formed elliptic shape curves in upset are found thro ugh quantitative calculati
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文摘:本文用数学解析法求解了矩形长板镦粗时(出现鼓肚)的应力场，定量计算出镦粗体内存在呈椭圆曲线的拉应力区，并得出拉应力区与镦粗基本参数的关系。 |
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Abstract: In this paper,the urgent monitoring process and post-seismic tendency analysis about Jingyang earthquake are introduced.The anomalous feature of the short leve lling variations in Jingyang Station during the earthquake preparation process w as s
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文摘:简要介绍了泾阳4.8级地震应急监测情况及震后地震趋势分析过程，着重分析了这一地震孕育发生过程中泾阳地震台短水准异常变化特征。 |
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Abstract: In this paper,through stress analysis of region about conical and spherical parts during drawing,a calculating formula of maximum tangential compressive stess in unsupported wall region is deduced.And this is condition of causing internal wrinkl
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文摘:通过对球形和锥形零件在拉深过程中各部分的应力分析，得到了拉深过程中悬空区切向压应力最大值的计算公式，以此作为引发内皱的条件，在保证工件不被拉裂的前提下，建立了临界计算公式。 |
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Abstract: In this paper,through the hydrogen-filling test for the kovar alloy of austenite under fixed load,the kovar alloy hydrogen brittleness sensitivity is measured its feature on hydrongen brittleness fracture is studied,and the way of solving the fr
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文摘:通过对面心立方奥氏体的可伐合金衡载荷充氢试验，测试了其氢脆敏感性并研究了氢断裂特征，提出了解决可伐合金脆断的方法。 |
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Abstract: In this paper,using numerical solution method of vector diffraction theory,we discuss the dependence of reflectivity upon structural parameters of subwavelength grating,particularly upon substrate thickness.It can be used as the basis for design
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文摘:利用矢量衍射理论的数值求解方法，研究了亚波长光栅结构参数对反射率的影响，特别是基底厚度对反射率的影响，这些为设计和制作具有优良的抗反射性能的二元光学元件提供了设计依据。 |
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Abstract: In this paper,using the improved L-P method and the interpolation perturbation method,the authors seek to solve a class of the damped strongly nonlinear free oscillation problems.Its first order approximate solution is obtained.
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文摘:本文用插值摄动法及改进的L-P法相结合的方法求解了一类有阻尼的强非线性自由振动问题，得到了一级近似解。 |
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Abstract: In this paper,virtual instrument technique is introduced into dynamic electric parameter measuring.VI's function units are constructed with structured software design method.A design and development method of virtual measuring instrument has bee
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文摘:将虚拟仪器技术引入动态电参量测量，用结构化软件设计的方法构造虚拟仪器的功能组件，提出了一种虚拟测量仪表的设计与开发方法。 |
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Abstract: In this paper,we derive predictive models of system and auxiliary system from double constant alterations respectively.The controller based on d-step ahead predictor can locate the closed loop poles at desired positions,whose parameters are adju
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文摘:引入双恒等变换推导出系统及辅助系统的的d步预测模型，基于估计器的自校正控制器能将闭环极点配置在所希望的位置，它的参数是由与其相互独立的对象参数调节.提出使用辅助估计器克服丢番方程的病态问题.仿真表明在存在可测干扰的情况下该系统具有良好的动态性能. |
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Abstract: In this paper,we develop a lofting method for railway tunnel profile including straight way and curve way,analyse carefully the error resources of lofting,and move an amendment one by one,precision analysis to the amended lofting formula shows t
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文摘:提出了铁路隧道断面（包括直道、弯道和坡度）的放样扫描方法，详细分析了放样扫描的误差来源，并逐一给出了修正方案，对修正后的放样公式作了精度分析，放样精度达到了预定的要求。 |
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Abstract: In this paper,we established the artificial neural network of the fault diagnosis of rotary mechanism using simulated annealing algorithm.We trained the neural network with seven kinds of fault sample of rotary mechanism and apply the neural net
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文摘:用模拟退火算法建立了旋转机械故障诊断的人工神经网络模型,以幅值谱中七个频段上的幅值为网络的输入模式,对旋转机械常见的几种故障进行分类训练,并应用于待识别故障样本的识别计算,证明该方法在旋转机械故障诊断中是有效的。 |
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Abstract: In this paper,we have had finite-calculation to dynamic structure according to the muffler drawings and the relation parameters.As we have received a disc impedance muffler model set at the entrance of LGA fan by using the optimum design way bef
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文摘:针对由最优化设计方法获得的LGA风机进口安装的圆盘式阻性消声器模型，在未对消声器实物加工之前，根据消声器的图纸及有关数据进行了有限元动力计算，从而初步了解消声器的动态特性.为设计优良的消声器提供新的有效途径. |
