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Structure of aero- engine case under the effect of combined axial pressure and end twist;2. The integration of CAD parametric modeling,finite element method,classical strength calculation theory with modern optimal design techniques produces a complete and systematic design procedure for performing parametric optimal design of turbine disk, engine case and turbine shaft.

开发了基于大型有限元分析软件Ansys的燃气涡轮发动机辅助设计系统，该系统将CAD参数建模技术、工程有限元数值计算方法、经典强度计算理论与现代优化设计技术相结合，实现了涡轮盘、机匣和涡轮轴典型零件的参数优化设计的完整设计流程，建立了结构优化设计平台；并通过机匣的结构优化设计实例，验证了燃气涡轮发动机辅助设计系统的有效性。

The relations of parametric equations with the route coordinates and the part coordinates are found out according to the curve model,the parametric equations of middle and side stakes in circular curve and easement curve are derived,thence the value of parameters is obtained,the solution procedure is got.

根据曲线模型，找出线路控制坐标系与局部坐标系坐标之间的参数方程关系，推出了缓和曲线及圆曲线中边桩坐标的参数方程，代入已知量求得参数的值，给出了求解步骤。

Stability of solutions of the cavitated bifurcation equation is discussed in each region by using the minimal potential principle, and the catastrophic phenomenon of cavity formation is explained. 2. In Chapter 4, problems of cavitated bifurcation for two spheres, which are composed of two different kinds of imperfect compressible hyper-elastic materials, were examined, respectively. The parametric analytic solutions of the radially deformed function and the parametric cavitated bifurcation solutions are all obtained for the two spheres.

利用奇点理论给出了空穴分岔方程在分岔点的等价正规形，将缺陷参数分成若干个区域，证明了当缺陷参数属于某些区域时，具有缺陷的超弹性材料球体发生空穴分岔时的临界载荷比无缺陷的小；并利用最小势能原理讨论了空穴分岔方程的解在各个参数区域内的稳定性，解释了空穴生成的突变现象。

The ideas of object-oriented technology and parametric design computation are combined to construct this parametric design system of overhead crane based on object-oriented technology. The corresponding technology are fully used to design and compute partial mechanism of overhead crane. This system makes the devisers design convenient and design period is shortened, and in the meantime work efficiency is improved.

基于面向对象技术的起重机参数化设计系统结合面向对象技术和参数化设计计算的思想，充分利用各相关技术，对桥式起重机部分机构进行设计计算，方便设计人员设计，缩短了设计周期，提高了工作效率。

Based on the design of automotive gearboxes,the parametric design method and the parametric feature-based modeling for serial products are analyzed in this paper.

本文以系列化汽车变速器为对象，分析其产品的参数设计方法及模型的参数化建立方法。

The main tasks are finished in this paper;(1) Make use of the parametric technique to the 3D parametric model of roller sprockets.

本文完成的主要内容：(1)利用Autodesk Inventor的参数化技术建立了链轮三维参数化模型。

Skid wooden box parametric design system was designed by using Visual Basic and Access, based on SolidWorks. The establishment of databases and standard model bases as well as parametric design procedures was introduced. The function of the system was illustrated by specific examples. The system can generate qualified skid wooden boxes by inputting basic parameters. Automatic wooden box design was realized.

利用Visual Basic语言，并结合Access数据库，对SolidWorks软件进行二次开发，开发了滑木箱参数化设计系统详细介绍了数据库、标准模型库的建立以及参数化设计过程并通过实例展示了系统的具体功能，用户只要输入基本参数，系统即可生成符合要求的木箱，实现了木箱设计的程序化、自动化。

Analysis of ship parametric rolling in head sea;2. A numerical simulation method based on ITTC recommendation was used to investigate the occurrence and magnitude of parametric rolling in longitudinal regular waves.

基于ITTC推荐的参数横摇运动方程，采用估算方法确定方程中的阻尼系数和复原力矩系数，数值模拟出船舶在规则波中的参数横摇情况，将上述方法具体应用于一艘滚装船船模的参数横摇预报，并与试验数据进行对比，验证了所采用方法的有效性。

A method to realize automatic parametric drawing to a scale was found through the bursting disc devices parametric drawing system, the problem of automatic drawing by scale and fill in title bar and list automatically is solved by this method.

通过爆破片装置参数化绘图程序的开发，探索出了一条实现参数化按比例自动绘图的方法，解决了工程图的自动按比例绘制和标题栏、明细表的自动填写问题。

Accordingto the absurdness of engineering drawings after parametric driving, doredevelopment to the engineering drawings based on the study of theory and methodof engineering drawings, realize the auto-regulation through programming.

同时根据工程图模板参数化驱动后出现图面凌乱的情况，对工程图绘制的理论和方法进行了研究，进行了工程图的二次开发，通过程序实现工程图的自动调整。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。