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The results of prediction agree well with the experimental ones. It proves that the thermo-mechanical analysis、the neural network models of flow stress and microstructure as well as the numerical simulation system developed combining coupled thermal-mechanical rigid-viscoplastic FEM with BP neural networks are reliable to describe the hot back extrusion process of Ti15-3 alloy truly. The simulation system has good prediction capacity for the microstructure evolution of Ti-15-3 alloy during hot backward extrusion and after solution treatment. It can be used to replace the experiments for predicting the flowing laws and the distribution of microstructure.

由此证明，本文的热力耦合理论分析、流变应力及显微组织的神经网络预测模型以及采用三维热力耦合刚粘塑性有限元与三层向后传播的人工神经网络相结合的方法开发的Ti-15-3合金筒形件热反挤成形的显微组织数值模拟系统是可靠的，能够真实地描述Ti-15-3合金热反挤工艺过程，并对其反挤成形及固溶处理后的显微组织具有很好的预测能力，可以被用来代替预测其反挤成形规律和组织分布情况的试验。

In this paper,the FEM and Fatigue Life Test Method were used to study optimization of reliability of the balance arm of some special vehicle.

平衡肘是履带车辆的关键件，该文用有限元法和疲劳寿命试验法对某特种车辆的平衡肘进行了可靠性优化研究，上述方法给出了关键部位的最佳尺寸。

The FEM results were found to be comparable to experimental data.

结果发现有限元预测结果和实验数据具有可比性。

The HT FEM is demonstrated to be ideally suited for the analysis of the fracture problem.

可看出HT 有限元是一种比较适合于断裂力学分析的数值方法。

The numerical methods in engineering such as FEM and BEM have been successfully used.

工程中的数值方法，如有限元法和边界元法等目前已取得了很大成功。

The radiation noise of gearbox housing is studied by the use of combined the FEM and BEM.

采用有限元和边界元联合的方法对变速器箱体的辐射噪声进行分析研究。

Two methods are provided here for the combination of the FEM and BEM, or for FEBEM.

本文提出了两种有限单元和边界单元的耦合方法。

The combined FEM and BEM proposed in this dissertation provides a new approach to an efficient parameter-inversion in hydrogeology.

本文提出的有限单元和边界单元耦合方法为建立有效的水文地质参数反演方法开辟了新的途径。

Compared with results of FEM and other methods, the results of BEM can satisfied the boundary conditions more accurately, It is very important for analyzing the rolling processes.

计算结果表明和有限元法及其他数值方法相比更能精确地满足边界条件，为精确分析轧制过程提供了一种新的计算方法。

So it is necessary to study on how to calculate bending moment utilizing the result of FEM.

这类结构在有限元计算中也易出现位移计算值偏小的剪切闭锁现象。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。