涡流穿过式传感器实际渗透深度的数学模型

采用直接测量固态导体内部磁场分布的方法，研究影响穿过式传感器实际渗透深度的各种因素。结果表明，实际渗透深度除与导体的电导率、磁导率及测试频率有关外，还与线圈的结构及激励磁场有关。最后利用遗传算法建立了涡流实际渗透深度的数学模型，为确定涡流在导体中的实际渗透深度提供了可靠依据。     

环境温度对斜探头K值,近场长度和波束指向角的影响

根据有机玻璃中超声纵波速度随温度变化的实际情况，阐述了斜探头K值，近场长度和波束指向角随环境温度的变化规律，分别导出了它们各自的数学表示式，可用于实际定量计算，为探伤实际应用提供了理论依据。     

洛阳市新建煤气管道的阴极保护

根据洛阳市土壤的腐蚀特性及煤气管道的实际情况，制定出了合理的阴极保护方案，经过几年的实际运行，证明保护效果良好。     

平面分流焊合成形力的工程简易算法

平面分流焊合模在有色金属型材挤压中得到较多的采用，本文结合金属流动的数值模拟结论和对ＭＢ２合金实际单位挤压力的研究结果，给发流焊合挤压力的工程简化计算与实际相比，工程相对误差小于１０％，可供实际参考。     

平面分流焊合成形力的工程简易算法

平面分流焊合模在有色金属型材挤压中得到较多的采用，结合金属流动的数值模拟结论和对ＭＢ２合金实际单位挤压力的研究结果，给出了平面分流焊合挤压力的工程简化计算方法，与实际相比，工程相对误差小于１０％，可供实际参考。     

中州企业认真学习《江泽民文选》

近日，中州铝厂党委中心组成员集中学习《江泽民文选》。中州铝厂党委强调，学习《江泽民文选》要发扬理论联系实际的马克思主义学风，按照“真学、常学、深学、勤于思考，善于运用，真正学通弄懂”的要求，紧密联系中州企业工作实际和干部职工思想实际，真正学以致用，用以促学，学有所成，确保做到思想水平有明显提高、各项工作有新起色，为中州企业可持续发展提供正确的理论指导。     

一种新的变轴数控机床标定方法

本文论述了国内外并联数控机床所采用的标定方法，选择了序列法进行了标定试验。但在实际标定过程中，出现了部分数据误差较大的问题，本文针对所面临的问题，提出了数值逼近法，并应用到实际机床的标定中，获得了机床的相关参数。之后，通过数学模型的计算值和实际测量值对比，验证了数据的可靠性，从而验证了方法的可行性和正确性。     

硬铬镀层针孔故障及其防治方法

硬铬镀层时常产生针孔故障，对针孔故障产生的原因作了分析，结合生产实际，提出了一些防止针孔故障的有效方法，具有实际应用价值。     

三通管胀形模拟与实际成形差异研究

将有限元软件模拟得到的结果与实际成形结果相比较，指出了在三通管胀形过程中模拟结果与实际成形结果的差异，并分析了模拟结果与实际成形结果差异的原因。     

冒口重量系数计算法

提出了一种实际冒口重量的计算方法。以圆柱和腰圆斜度为１∶１０的冒口形式为例，对查表或简单计算得到的不带斜度的冒口重量乘以一个系数，便可得到实际带有斜度的冒口重量，简化了实际冒口重量的运算。     

A cellular operator model for the simulation of static recrystallization

This paper introduces an advanced recrystallization model, based on the principles of cellular automata. The model employs a scalable subgrid technique for efficient tracking of local variations during recrystallization and provides excellent statistics of grain size and texture after recrystallization. Grain boundary nucleation, transition band nucleation and particle-stimulated nucleation were incorporated in the model. This model can interface with other microstructural models, such as a deformation texture model, a dislocation density based flow stress model and a precipitation model. The sensitivity of the model with respect to minute changes of microstructure and microchemistry was tested. Finally, a through-process exercise was conducted to assess the performance of the model in multi-step simulations.     

氧化铝烧结法生产的生料浆质量预测模型及应用

针对烧结法氧化铝生产过程中生料浆配料工艺的特点，根据物料平衡的原理建立机理模型，作为生料浆质量预测的主规律模型；针对碱液成分波动大且难以实时检测的问题，对碱液成分含量建立了神经网络预测模型，并和机理模型进行嵌套集成；利用灰色理论对机理模型的偏差数据进行信息挖掘，建立了GM（1，1）补偿模型，并与机理模型进行并联集成，获得生料浆质量预测模型。验证结果表明，该质量预测模型能获得较理想的生料浆质量预测精度，其应用可使生料浆质量得到显著的提高。     

TC4钛合金焊接结构连续非线性疲劳损伤

文中从TC4焊接结构在船舶舰艇领域的使用特性出发,根据第四强度理论对现有的连续非线性损伤模型进行修正,提出更符合工程实际的非线性损伤模型,并根据疲劳试验数据测算出其模型参数.然后通过疲劳卸载试样SEM观察分析,验证所修正的损伤模型.再通过非线性损伤修正模型和线性损伤模型及试验数据的对比.结果表明,线性损伤模型在中小载荷下的寿命相对保守,而非线性损伤模型则更接近试验值,证明了修正模型的工程应用价值.     

Modeling and simulation of the flow field in the electrolysis of magnesium

A three-dimensional mathematical model was developed to describe the flow field in the electrolysis cell of the molten magnesium salt, where the model of the three-phase flow was coupled with the electric field force. The mathematical model was validated against the experimental data of the cold model in the electrolysis cell of zinc sulfate with 2 mol/L concentration. The flow field of the cold model was measured by particle image velocimetry, a non-intrusive visualization experimental technique. The flow field in the advanced diaphragmless electrolytic cell of the molten magnesium salt was investigated by the simulations with the mathematical model.     

基于深度森林的热轧带钢凸度预测模型

在热轧现场轧制规格切换或工况异常的情况下板凸度控制模型偏差较大,为了提高模型精度,提出了一种基于深度森林的热轧带钢凸度预测模型。深度森林模型融合了集成学习和深度学习的思想,采用了多粒度扫描增加数据特征多样性,采用级联森林逐层处理,使得模型具备强大数据拟合能力。将热轧数据经前期预处理导入模型,并对模型参数进行了网格搜索寻优,对比随机森林模型,深度森林模型的效果更优。基于深度森林的热轧带钢凸度预测模型得到了MSE值为6.537,MAE值为1.587,MAPE值为2.903%和R值为0.985的预测性能。     

Analysis of bearing configuration effects on high speed spindles using an integrated dynamic thermo-mechanical spindle model

This work presents the effects of bearing configuration on the thermo-dynamic behavior of high speed spindles using the comprehensive dynamic thermo-mechanical model. The dynamic thermo-mechanical model consists of a comprehensive bearing dynamic model, a shaft dynamic model and a thermal model. The thermal model is coupled with the spindle dynamic model through bearing heat generation and thermal expansion of the whole system based on the bearing configuration. Thus the entire model becomes a comprehensive dynamic thermo-mechanical model. The new thermo-mechanical model also considers a pertinent mapping between bearing stiffness and shaft stiffness matrices based on bearing configurations, so that more general cases of bearing configurations can be modeled. Based on this model, the effects of bearing orientation on the spindle dynamics are systematically described and experimentally validated. It is shown that bearing orientation has a significant effect on spindle stiffness. Finally, the effects of various bearing configurations on spindle thermal and dynamic behavior are illustrated through numerical analysis with three different spindles.     

Improvements to Alexander’s computer model for force and torque calculations in strip rolling processes

Increasing competition in the metal industry and advances in technology lead to additional demands for accurate analyses so that better strip quality in terms of gauge and shape at the minimum cost can be obtained. In strip rolling, accurate determination of rolling force, torque, and slip are extremely important to the proper design and control of the whole process. In the present investigation, a computer model is developed for force and torque calculations for hot and cold flat rolling processes based on the enhanced slab method. Alexander’s computer model, which is based on Orowan’s model, is used as a starting point. To develop the present model, improvements are made in Alexander’s model. Further, the present model is verified with the hot strip rolling data and the results are compared with the Sims, Orowan and Pascoe, Ekelund, and Crane and Alexander models. In this paper, improvements to the Alexander model and verification of the modified model with the hot strip rolling data and comparison with the other models are discussed.     

Inspection of the cylindrical surface feature after turning using coordinate metrology

The aim of the study is to derive a model for cylindricity that is based on turning process variables. A mathematical model was defined for the helical geometry based on feed rate, radius of the bar and rake angle.Additionally, radial and tangential cutting forces result in the deflection on the workpiece, and change the nominal depth of cut. Hence, a deflection model was added to the above mathematical model.An experiment with four different work pieces was performed to analyze model efficiency. The cutting forces were measured and the amount of deflection for each point on the surface was calculated based on the deflection model. The surfaces of these four different work pieces were measured with two different sampling strategies with same sample size. Each non-linear function was solved using software, and feed rate, workpiece radius, residuals and minimum zone of error obtained from the model and compared against the theoretical results. The results showed that the developed model calculations compared well with theoretical results.     

Identification of shearing and ploughing cutting constants from average forces in ball-end milling

This paper presents an analytical model for the direct identification of global shearing and ploughing cutting constants from measured average cutting forces in ball-end milling. This model is based on the linear decomposition of elemental local cutting forces into a shearing component and a ploughing component. Then, a convolution integral approach is used to obtain the average cutting forces leading to a concise and explicit expression for the global shearing and ploughing cutting constants in terms of axial depth of cut, cutter radius and average milling forces. The model is verified by comparisons with an existing force model of variable cutting coefficients. Cutting constants are identified through milling experiments and the prediction of cutting forces from identified cutting constants coincides with the experimental measurements. A model for identifying the lumped shearing constants is obtained as a subset of the presented dual mechanism model. Experimental results indicate that a model with dual-mechanism cutting constants predicts the ball-end milling forces with better accuracy than the lumped force model.     

骨质疏松动物模型的研究进展

近年常用于骨质疏松的模型动物有大鼠、小鼠、兔、犬、羊、猪等。以大鼠最为常用。用于制模的方法有年龄相关的骨丢失,去势模型,药物类模型,废用性骨质疏松模型,营养类模型等。其中以去势模型,特别是去卵巢动物模型最常用。常用的评价方法有生化指标的测量、骨密度测量、骨组织计量学观察、骨生物力学指标检测等。其中生化指标和骨组织计量学是主要的指标。